Page 1 SERVICE MANUAL REVISION 0 FY8-13F4-000 FEB. 1998 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 2 IMPORTANT THE INFORMATION CONTAINED HEREIN IS PUBLISHED BY CANON, INC., JAPAN, AND IS FOR REFERENCE USE ONLY. SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER PRINTED MATTER. ANY QUESTIONS REGARDING INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.
Page 3 This Service Manual provides basic facts and figures you will need to service the plain paper copier NP6621 in the field. The NP6621 is designed to enable automated copying work and may be configured with the following accessory; for servicing information on the sorter, ADF, and control card, see their respective Service Manuals: 1.
Page 4 Paper Deck Pedestal-K1 Holds up to 1500 sheets of one type of paper. © COPYRIGHT 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 5: Table Of Contents
A. Pick-Up from the Machine ....3-57 Separation Mode ....... 3-34 B. Making Two-Sided Copies (1copy) ... 3-61 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 6 A. Unpacking .......... 5-28 CARD IV N ..........5-14 B. Installation to the Copier ....5-28 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 7 J. CASSETTE FEEDING MODULE-B2 GENERAL CIRCUIT DIAGRAM ..... A-34 K. CASSETTE FEEDING MODULE-B2 DRIVER CIRCUIT DIAGRAM ....A-35 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 9 A. Exterior ..........1-7 Eliminator ........... 1-33 B. Cross Section ........1-8 VI. ROUTINE CLEANING ......1-34 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 11: Features
3. Dependable high image quality. • The new HQ (high-quality) toner ensures faithful reproduction of solid black, text, and photos. • In addition to Canon’s own single-component toner projection development method, the use of auto image control (AIC) ensures stable reproduction of images.
Page 12: Specifications
Manual Transfer Roller Separation Curvature + static eliminator Cleaning Cleaning blade Fixing Heat roller, 900W 1–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 13 *2 If in manual mode, remove curling before second feeding. *3 Fan out sheets before setting to eliminate adhesion. 1–3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 14 1: 2.000 ENLARGE II 49% to 204 % (1% increments) ZOOM Table 1-201 Defaults Reproduction Ratio 1–4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 15: Cassette Feeding Module-B2/ Cassette Feeding Module-A2/Cassette Feeding Unit-K1
Cassette Feeding Module-B2: 9 kg/19.8 lb Cassette Feeding Module-A2: 16 kg/32.3 lb Cassette Feeding Unit-KI: 29.6 kg/65.3 lb Table 1-203 1–5 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 16: Paper Deck Pedestal-K1
Dimensions (W × D × H; mm/in) 610 × 583 × 414/24.0 × 21.4 × 16.3 Table 1-204 1–6 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 17: Names Of Parts
Copy density correction volume Anti-condensation heater switch (rear) Static eliminator cleaner Fluorescent heater switch (front) Figure 1-302 1–7 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 18: Cross Section
No. 4 mirror Copyboard glass Delivery roller No. 5 mirror Drum unit Multifeeder pick-up roller Figure 1-303 1–8 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 19 Cassette 4 pick-up roller Cassette 4 Drive roller Cassette 3 pick-up roller Feeding roller Figure 1-304 1–9 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 20 Cassette 5 pick-up roller Cassette 4 pick-up roller Cassette 5 Vertical path roller 4 Figure 1-305 1–10 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 21 Lifter Deck vertical path roller Deck Vertical path roller 3 Deck feeding roller Figure 1-306 1–11 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 22 GENERAL DESCRIPTION 1–12 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 23: Basic Operation
* Enter the original size with the Number keys and then press the OK key. Table 1-401 1–13 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 24 GENERAL DESCRIPTION 1–14 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 25 Press to set or change standard settings and custom settings according to specific user needs, and when adjusting and cleaning the copier. Table 1-403 1–15 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 26: Making Copies
• Press the keys to select a preset copy ratio. 1–16 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 27: Using The Stack Bypass
Figure 1-409 Auto Paper Selection, specify the size. 1–17 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 28 Paper Supply indicator. Auxiliary tray Autom.Paper Figure 1-411 Autom.Zoom ZOOM Figure 1-413 1–18 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 29: User Mode
The number for a function that can be set. The present setting for a certain function. •“ Autom.Zoom Figure 1-417 ZOOM Figure 1-416 1–19 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 30: Auto Clear Time
• The Auto Energy Saver Time is changed and quantity/Copy ratio display. “U02” is displayed. 1–20 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 31 • Fine adjustments ratios are displayed in the copy exposure display as follows: (+0.8%) (+1.0 %) 1–21 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 32 ON/OFF setting is cleared and the copier cannot be initiated. returns to the normal copying mode. 1–22 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 33 • Stack Bypass Size Entry ON or OFF is set and “U5” is displayed. 1–23 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 34 Standard Copy Setting Store/Initialize are cleared and the copier returns to the normal copying mode. 1–24 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 35 Additional Functions are not initial- ized, and the copier will return to the normal copying mode. 1–25 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 36: Warnings And Actions
Fixing assembly Knob Figure 1-503 1–26 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 37 Lever Figure 1-511 Figure 1-507 Figure 1-508 1–27 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 38 1) Open the front door. Figure 1-514 Figure 1-516 1–28 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 39 Paper Deck (options). Figure 1-519 Figure 1-522 1–29 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 40 If not, close it securely. Figure 1-527 Figure 1-524 Figure 1-528 Figure 1-525 1–30 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 41 Also, some toner may stick to the toner cartridge, so be careful not to get toner on your clothes. 1–31 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 42 Be sure to turn the cartridge until it locks into place. If it does not lock into place, toner may spill out. 1–32 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 43: Cleaning The Static Charge Eliminator
• You cannot operate the copier if the front door static charge eliminator. is open. Cleaning brush Figure1-539 1–33 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 44: Routine Cleaning
Then, wipe with a dry cloth. 1–34 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 45 E. Step 3 (image exposure) ..... 2-4 A. Blank Exposure ........2-8 F. Step 4 (development) ......2-4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 47: Image Formation
Manual feeding Delivery Separation Registration Fixing Cassette flow of copy paper rotation of drum Figure 2-102 2–1 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 48: Latent Static Image Formation Block
Pre-ex Figure 2-103 Image exposure -1000 posure (step 2) (step 3) (step1) Figure 2-104 2–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 49: Step 1 (Pre-Exposure)
The primary charging roller is a special roller and possesses different characteristics from the transfer roller. 2–3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 50: Step 3 (Image Exposure)
Blade Toner Magnet Magnet Figure 2-109 2–4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 51: Step 5 (Transfer)
2–5 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 52: Step 6 (Separation)
2–6 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 53: Step 7 (Fixing)
2–7 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 54: Auxiliary Process
Blank exposure light path (for area between sheets) Pre-exposure light path Photosensitive drum Figure 2-201 2–8 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 55: I. Basic Operations
G. Multifeeder ......... 3-82 (image formation system) ....3-36 H. Identifying the Size of the Cassette ... 3-85 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 56 A. Electrical .......... 3-127 C. Control Display Mode (‘1’) ....3-107 D. I/O Mode (‘2’) ........3-110 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 57: Basic Operations
Flow of high voltage/toner Flow of paper Flow of light Flow of electrical signals Figure 3-101 3–1 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 58: Outline Of Electrical Circuitry
Cassette driver PCB/ Paper deck driver PCB Cassette pick-up clutch Deck pick-up clutch Figure 3-102 3–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 59: Inputs To The Dc Controller
- 11 PS 10 (when the light-blocking plate is not at PS10, '0') Figure 3-103 3–3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 60 When paper is present at the vertical paper sensor - 14 PS 16 path roller 1 sensor, '1'. Figure 3-104 3–4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 61 J 310B- 2 SIZE1 Varies according to paper size. Original size sensor 1 PS 23 Figure 3-105 3–5 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 62 2 - 10 See p. 3-85. CSZ3 - 11 CSZ4 - 12 Figure 3-106 3–6 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 63 Adjusts the developing DC bias VR850 AE sensor adjustment volume VR851 AE sensor (2/2) Figure 3-107 3–7 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 64: Outputs From The Dc Controller
Toner level When '0', "ADD TONER" TEP* detection is indicated. sensor Antenna Sensor Figure 3-108 3–8 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 65 J302 Scanner motor See p. 3-33. J324B Lens motor See p. 3-29. J324A Figure 3-109 3–9 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 66 While M5 is rotating, alternates Duplexing between '1' and '0. unit motor (pulse signal) Figure 3-110 3–10 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 67 SL 8 SL8D* plate solenoid solenoid (SL8) turns ON. (duplexing unit inlet opened) Figure 3-111 3–11 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 68 When '0', a copy is counted. AST-CNTP* Transmission data (IPC communication) AST-TXD Reception data (IPC communication) AST-RXD Figure 3-112 3–12 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 69: Inputs To And Outputs From The Cassette Feeding Module-B2 Driver Pcb
+24V CMA* between '1' and '0'. Cassette M1cu (pulse signal) unit motor CMB* Figure 3-113 3–13 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 70: Inputs To And Outputs From The Cassette Feeding Module-A2 Driver Pcb
J 120 C4SZ1 Cassette 4 C4SZ2 size detection See p. 3-85. C4SZ3 C4SZ4 Figure 3-114 3–14 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 71 CMA* alternates between '1' and '0'. Cassette M1cu (pulse signal) unit motor CMB* Figure 3-115 3–15 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 72: Inputs To And Outputs From The Cassette Feeding Unit-K1 Driver Pcb
(the light-blocking plate is at the sensor) J 130- 4 Cassette 5 paper detection PS7cu Figure 3-116 3–16 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 73 J 130 Cassette 5 size - 10 detection PCB - 11 - 12 Figure 3-117 3–17 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 74 *When '0', cassette 4 input/output is selected; when '1', cassette 5 input/output is selected. Figure 3-118 3–18 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 75 J 114- 1 SIZE 2 Deck size switch SIZE 1 See p. 3-81. Figure 3-119 3–19 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 76 J114-6 Deck pick-up roller DEPRL* When "0" , SL1 goes ON. release solenoid Figure 3-120 3–20 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 77: Main Motor Control Circuit
Main motor Hall IC output MMCLK Reference signal Main motor driver PCB Figure 3-121 3–21 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 78: Basic Sequence Of Operations (2 Copies, Continuous, Ae)
Transfer bias Static eliminator bias Scanning lamp Scanner Developing AC bias Developing DC bias Figure 3-122 3–22 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 80: Original Size Detecton Control
Copyboard cover open/ closed sensor PS11 DC controller PCB Figure 3-123 (A configuration) 3–24 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 81 Copyboard glass Level does Level changes not change Original detection 2 Original detection 1 Figure 3-124 3–25 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 82 Changes Does not change Does not change Changes Changes Changes Table 3-102 (A configuration original) 3–26 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 83: Exposure System
DIRECT first copy time.) REDUCE ENLARGE Figure 3-201 3–27 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 84 Lens cable Lens Lens home position sensor (PS2) Enlargement Cam groove DC controller Figure 3-202 3–28 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 85: Lens Motor Drive Circuit
Motor drive voltage switching circuit LNSCA LNSA LNSA* LNSB (Q301) LNSB* Lens motor Figure 3-203 3–29 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 86 Change solenoid (SL1) Enlarge Reduce Lens Lens home position sensor (PS2) Figure 3-204 3–30 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 87: Scanner Drive System
No. 2 mirror mount Scanner home position detection signal (SCHP) Scanner home position sensor (PS1) Figure 3-205 3–31 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 88 *The scanner is returned to home position at power-on whenever the scanner is not at home position. Figure 3-206 3–32 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 89: Driving The Scanner Motor
Microprocessor Motor driver circuit SCB* Current value Current value switching switching control circuit Figure 3-207 3–33 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 90: Operations Of The Scanner In Page Separation Mode
Figure 3-208 is in excess of about 216 mm, 216 mm is used to represent the leading edge of the second page. 3–34 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 91: Image Formation System
Scanning lamp High-voltage Transfer ON control circuit circuit roller Q301 Microprocessor Microprocessor Figure 3-301 3–35 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 92: Sequence Of Operations (Image Formation System)
Reference bias (ATVC) Separation static eliminator Developing bias AC component Developing bias DC component Figure 3-302 3–36 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 93: Controlling The Scanning Lamp
Switching circuit circuit -13 ZXDP DC controller PCB Composite power supply Figure 3-303 3–37 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 94: Controlling The Primary Charging Roller
PCTRLS Microprocessor Current U402 detection circuit PCURS DC controller PCB Q301 (master) Microprocessor Figure 3-304 3–38 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 96 DC controller, which determines the pri- mary charging roller bias application voltage based on the result. 3–40 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 97: Controlling The Transfer Roller Bias
Main motor (M1) Transfer bias Cleaning bias (+) Reference bias (ATVC) Static eliminator bias Figure 3-305 3–41 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 98 (transfer bias) (ATVC) (cleaning) Microprocessor DC controller PCB Microprocessor (Q301) Figure 3-306 3–42 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 99 10 µA flows. thereby controlling the TFWPWM signal. 3–43 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 100: Controlling The Static Eliminator Bias
Static Transformer eliminator circuit JLVCTL JCTL Microprocessor J307 DC controller PCB Q301 Microprocessor Figure 3-307 3–44 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 101 When the JCTL signal turns ON, the drive circuit turns ON to generate the static eliminator bias. 3–45 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 102: Controlling The Developing Bias
VR850 Q301 Microprocessor Copy density correction volume Copy Density key DC controller PCB Figure 3-308 3–46 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 103 DC component of the developing bias to suit the following: -100 (dark) (light) Copy density Figure 3-309 3–47 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 104: Copy Density Automatic Control
27 mm (approx.) (approx.) Note: A represents the sensor position. Figure 3-311 AE Sensor Reading Area 3–48 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 105 After AE adjustment with Test Chart NA3, using AE mode, density adjustment should show “5”. In non- AE mode, using NA3, density “5” must be appropriate (adjusted with VR850). Table 3-302 3–49 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 106: Developing/Cleaning Assembly
Torque limiter Main motor/ Main motor driver PCB Motor drive signal DC controller PCB Figure 3-312 3–50 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 107 Toner Blade DC controller Antenna sensor circuit Developing cylinder Comparator circuit TEP* Figure 3-313 3–51 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 108 Toner absent signal (TEP*) AC bias REPLACE CARTRIDGE message (flashed) A43, AE, 3 copies, continuous. Figure 3-314 3–52 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 109: Blank Exposure Control
Pre-exposure lamp Blanking shutter home position sensor (PS3) Open/close shutter DC controller PCB Figure 3-315 3–53 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 110 Pre-exposure optical path Drum cleaning Drum assembly cartridge Pre-exposure Photosensitive reflecting plate drum Figure 3-317 Figure 3-316 3–54 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 111: Primary Charging Roller Cleaning Control
Primary charging roller Primary charging roller Fulcrum Fulcrum cleaning solenoid Cleaning pad Drum unit Drum Figure 3-318 3–55 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 112: Transfer Roller Locking/Releasing Control
Photosensitive drum Transfer roller Transfer roller locking releasing solenoid Locking Fulcrum Releasing Figure 3-319 3–56 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 113: Pick-Up/Feeding System
(M7). Other motors are driven by the main motor 3–57 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 114 OPERATIONS AND TIMING DC controller PCB Figure 3-401 3–58 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 115 OPERATIONS AND TIMING PS17 PS15 PS14 PS16 PS12 PS13 DC controller PCB Figure 3-402 3–59 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 116 Registration sensor (PS6) Separation sensor (PS7) Delivery sensor (PS8) Scanner home position sensor (PS1) Figure 3-404 3–60 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 117: Making Two-Sided Copies (1Copy)
Figure 3-405 Set-back rollers Outlet roller (reverse) Duplex inlet Duplex exit detect sensor sensor Figure 3-406 3–61 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 118 Duplexing unit outlet clutch (CL4) Duplexing unit outlet sensor (PS14) CW rotation CCW rotation Figure 3-408 3–62 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 119: Duplexing Unit
Set-back roller 1 Copy paper Duplexing unit lower plate Figure 3-409 3–63 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 120 Duplexing inlet paper sensor (PS15) Duplexing unit motor (M5) CW rotation CCW rotation Figure 3-411 3–64 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 121 2. The leading edge of the copy paper butts against the set-back roller 1 and forms an arch. Figure 3-413 Set-back rollers Figure 3-414 3–65 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 122 5. The leading edge of the second copy paper butts against the set-back roller 1 and forms an arch. Set-back roller 1 Figure 3-417 3–66 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 123 8. Operations 4 through 7 are repeated for as many times as there are copies to make, and the copies are stacked in the duplexing unit. 3–67 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 124 6 mm before the set-back rollers 1. Duplex exit detect sensor (PS14) Set-back roller Figure 3-420 3–68 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 125 Duplexing unit outlet clutch (CL4) Registration sensor (PS6) Registration clutch (CL1) CW rotation CCW rotation Figure 3-421 3–69 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 126 Photosensitive drum Slip roller Set-back roller Figure 3-424 3–70 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 127 Separation Photosensitive Registration sensor(PS6) sensor drum Slip roller Figure 3-425 3–71 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 128: Pick-Up From The Cassette Feeding Module-A2
Cassett e 4 Cassette M1cu unit motor Cassette drive PCB DC controller PCB Figure 3-426 3–72 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 129 Cassette unit motor (M1cu) Registration clutch (CL1) Registration sensor (PS6) Main motor (M1) Figure 3-427 3–73 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 130: Pick-Up From The Cassette Feeding Unit-K1
PS4cu CL2cu PS5cu PS6cu CL3cu M2cu M1cu Cassette driver PCB DC controller PCB Figure 3-428 3–74 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 131 (PS5cu) Registration clutch (CL1) Copier Registration sensor (PS6) Scanner home position sensor (PS1) Figure 3-430 3–75 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 132: Basic Construction
Deck lifter upper limit sensor SL1: Deck pick-up roller release solenoid PS6: Deck open sensor Figure 3-431 3–76 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 133 Deck vertical path roller paper sensor CL2: Deck vertical path roller drive clutch Figure 3-432 3–77 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 134 Deck vertical path roller drive clutch (CL2) Vertical path roller 3 drive clutch (CL3) Figure 3-433 3–78 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 135: Lifter Operation
Pick-up roller down, i.e., the light-blocking plate of the lifter detecting lever rises to leave the deck lifter position sensor (PS3) Figure 3-434 3–79 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 136 Lifter limit detecting lever Lifter upper limit sensor (PS4) Copy paper Oil damper Figure 3-435 3–80 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 137 Lifter Figure 3-436 Paper detecting lever Paper detecting spacer Paper sensor (PS1) Lifter Figure 3-437 3–81 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 138: Multifeeder
Registration roller paper sensor Multifeeder pick-up solenoid Paper guide plate cam Spring clutch Figure 3-438 3–82 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 139 DC controller PCB Slide guide (rear) Variable resistor (VR1) Slide guide (Front) Multifeeder tray Figure 3-439 3–83 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 140 Multifeeder pick-up clutch (CL3) Pre-registration sensor (PS6) Registration clutch (CL2) Scanner motor (M2) Figure 3-440 3–84 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 141: Identifying The Size Of The Cassette
* Sizes may be stored in memory within dimensions given (in mm; see the Service Handbook for details). 3–85 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 142 Advise the user so that both sizes match. Guide plate (horizontal) Guide plates (vertical) Paper size lever Figure 3-441 3–86 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 143: Fixing/Delivery Assembly
Aux themistor (TH2) is at same position of main thermistor and is checking correct function of TH1. 3–87 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 144 > 21 > 34 > 53 > 57 Table 3-403 3–88 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 145 Lower fixing roller detection Cleaning roller HTRD Power supply J307-2 ACOFF Error detection circuit Relay(K1) Table 3-442 3–89 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 146 155˚C 115˚C 90˚C 50˚C ; Actual temperature(Paper area) ; TH1/TH2 control temperature(Control area) Figure 3-443 3–90 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 147 OFF and if it finds an error, it will turn OFF the power. At this time, ‘E004’ data will be stored in memory. 3–91 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 148: Detecting Jams
3–92 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 149 Vertical path roller 1 paper sensor (PS16) Main motor (M1) Figure 3-445 Sequence of Operations 3–93 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 150 Vertical path roller 2 paper Error sensor (PS12) Main motor (M1) Figure 3-447 Sequence of Operations 3–94 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 151 Vertical path roller 2 paper sensor (PS12) Main motor (M1) Figure 3-449 Sequence of Operations 3–95 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 152 Jam check Normal Error Separation sensor (PS7) Main motor (M1) Figure 3-451 Sequence of Operations 3–96 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 153: Delivery Delay Jam
Jam check Normal Error Delivery sensor (PS8) Main motor (M1) Figure 3-452 Sequence of Operations 3–97 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 154: Delivery Stationary Jam
Cassette 4 vertical path sensor (PS3cu) Cassette 5 vertical path sensor (PS5cu) Figure 3-454 Sequence of Operations 3–98 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 155 Cassette 4 vertical path sensor (PS3cu) Cassette 5 vertical path sensor (PS5cu) Figure 3-455 Sequence of Operations 3–99 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 156 Pick-up clutch (CL1) Jam check Vertical path roller normal error paper sensor (PS2) Figure 3-457 3–100 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 157: Power Supply
Scanning lamp +24V,5V Sorter composite power supply circuit +24V,5V DF/RDF +34V,24V,5V Deck Figure 3-501 3–101 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 158: Power Supply Circuitry
T101 DC Power +30V supply +24V unit Q308 Power supply unit DC controller Figure 3-502 3–102 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 159: Detecting Errors On The Power Supply Pcb
(U402) communicates error data to the DC controller PCB to indicate ‘E064’. 3–103 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 160: Protection Mechanisms For The Power Supply Circuit
Keep the battery out of reach of children and discard any used battery promptly. 3–104 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 161: Service Mode
(‘3’, for example). 2) Press the Start key. • The machine starts the selected service mode. 3–105 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 162 Duplex paper stack adj Duplex inversion roller Halogen lamp intensity Duplex input loop Duplex output loop Figure 3-602 3–106 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 163: Control Display Mode ('1')
Normal if between ‘68’ and ‘72’. Jam interval Jam paper size data Jam document handler copying data Table 3-602 3–107 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 164 A press on ‘6’ indicates the sixth most recent error. A press on ‘7’ indicates the seventh most recent error. 3–108 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 165 Service program 121 displays the paper size at jam occurrence (B5, B5R, B4, A3, A4, A4R, A5, A5R, A6R) 3–109 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 166: I/O Mode ('2')
Port C digit P0 display tor to turn ON, representing the I/O state of the input port. Table 3-608 3–110 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 167 See the table below. Option cassette connection detection 2 See the table below. Reserved – Table 3-609 3–111 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 168 1-cassette optional feeding unit. × × 2-cassette optional feeding unit. × × 3-cassette optional feeding unit. 3–112 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 169 Heater ON detection (triac short circuit detection) ON: acknowledged Composite power supply ACK Table 3-611 3–113 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 170: Adjustment Mode ('3')
No. 307 or 308, it is recommended that page separation mode be selected before activating service mode. 3–114 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 171 A higher setting increases arching. (timing at which the pick-up roller default: turns OFF) unit: 0.27 mm Table 3-612-2 3–115 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 172 0 ~ 63 A higher setting increases the arch. default: unit: 0.27 mm Table 3-612-3 3–116 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 173: Operation/Inspection Mode ('4')
Jam history clear Error history clear Scanner AP initialization Back-up RAM clear See p. 3-133. Table 3-613 3–117 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 174: Machine Settings Mode ('5')
Activate it if the fixing on the first copy is poor because of a low-temperature environment. deactivated activated default: Table 3-614-1 3–118 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 175 Universal cassette paper size settings: 0 to 14 storage (cassette 5) default: Table 3-614-2 3–119 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 176: Counter Mode ('6')
• To obtain the actual count, multiply the indicated value by 100. Item Description Large copy counter Small copy counter Total copy counter Table 3-615 3–120 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 177: Self Diagnosis
(PS3dk) within 40 sec after the deck lifter • Lifter sensor (PS3dk; faulty) clutch (CL4dk) has turned ON. 3–121 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 178 E802 • Composite power supply (faulty) switch is turned off (ACOFF=0). • DC controller (faulty) 3–122 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 179 If ‘E000’, ‘E001’, ‘E002’, “E003', or ‘E004’ is indicated, remove the cause of the error and perform the following: 3–123 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 180: Self Diagnosis On The Cassette Feeding Unit
1 sec after the pedestal motor • Cassette feeding unit motor drive signal has been generated. (faulty) 3–124 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 181: Rdf/Adf Self Diagnosis
2. You may make copies even while the RF remains out of order by placing originals on the copy paper. 3–125 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 182: Sorter Self Diagnosis
ON within 10 sec after the lead cam placement) position sensor has turned OFF. 3–126 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 183: Standards And Adjustments
If you changed any of the settings indicated in the Service Mode label, be sure to record the new settings on the label. 3–127 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 184 • The machine indicates ‘208’. and press the AE key. • To increase the setting, press the AE key. 3–128 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 185 5) Record any new settings in the Service Mode label. 6) Press the Reset key. • The machine ends service mode. 3–129 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 186 Note: 1. After Adjustment, with test chart NA-3, using AE mode, density adjustment should show ‘5’. 2. In non-AE mode, using NA-3, density ‘5’ must be appropriate (adjusted with VR850). 3–130 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 187 • The machine ends service mode. store the sizes of the papers the user tends to use frequently. 3–131 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 188 No. 510 Korean Government Cassette 4 No. 511 Table 3-804 Cassette 5 No. 512 Table 3-803 3–132 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 189 Start key after the display has indicated ‘nop’. Figure 3-801 3–133 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 190 OPERATIONS AND TIMING 3–134 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 191 B. Composite Power Supply PCB ..4-50 E. Delivery Assembly ......4-22 C. AE Sensor PCB ......... 4-51 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 193: Externals
Figure 4-101 Left cover Lower rear cover Lower left cover Upper rear cover Figure 4-102 4–1 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 194: Control Panel
, and disconnect the four connectors (J801, J802, J803, J804); then, remove the control panel Figure 4-107 Figure 4-105 4–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 195: Fan
4) Remove the four screws , and remove the scanner cooling fan Figure 4-110 Figure 4-113 4–3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 196: Counter
(CNT2) Duplexing unit counter behaves. Small size copy counter No counter Table 4-101 4–4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 197: Drive System
(on the right and then left). 4) Fit the tensioner , and mount the spring and the E-ring 4–5 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 198 9) Remove the pulley clip, and remove the scan- ner cable (both front and rear). 4–6 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 199: Routing The Scanner Cable
, adjust the cable spring using a ruler so that its length is 34 ±1 mm. 4–7 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 200 Hook Cable spring Cable spring Cable Hook Cable (front) (rear) Figure 4-212 4–8 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 201 4) Using a blower brush or lint-free paper moist- ened with alcohol, clean the No. 6 mirror. 4–9 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 202: Lens Drive Assembly
5) Loosen the tension on the spring , and re- move the cable Figure 4-220 Figure 4-218 4–10 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 203 , disconnect the connector first to avoid contact between the harness and the driver. Figure 4-221 4–11 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 204: Routing The Lens Cable
, and wind it around the pulley 2) Move the tension pulley , and attach the cable. 4–12 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 205 B, i.e., when the E-ring come into contact with the solenoid. Figure 4-223 4–13 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 206: Main Motor
Figure 4-225 Vertical path roller gear Main motor Tensioner Vertical path roller clutch (CL7) Figure 4-226 4–14 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 207: Pick-Up/Feeding System
4) Remove the E-ring and the bushing ; then, remove the pick-up roller unit Figure 4-304 Figure 4-302 4–15 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 208 4) Remove the two screws , and remove the separation pad unit Figure 4-308 Figure 4-306 4–16 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 209: Multifeeder Assembly
Caution: Take care not to lose the pin from the rear. Figure 4-312 Figure 4-310 4–17 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 210 Take care so that the spring on the separation pad assembly will not fly off. Figure 4-314 Figure 4-316 4–18 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 211 , and remove the spring clutch Claw Solenoid plate Gear Paper guide plate cam Figure 4-319 Figure 4-318 4–19 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 212: Registration Roller Assembly
Install the multifeeder rack plate to the pulley with both left and right rack plates fully open. 4–20 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 213 3) Remove the upper registration roller by lifting Figure 4-326 Figure 4-325 4–21 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 214: Feeding Assembly
Feeding Belt.”) 2) Remove the three mounting screws , and remove the feeding fan Figure 4-328 4–22 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 215: Duplexing Assembly
; then, remove the paper size detection unit 1 Figure 4-333 Figure 4-331 4–23 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 216: Cassette Unit
2) Remove the stop ring (plastic) found at the front of the pick-up roller unit. Figure 4-337 Figure 4-335 4–24 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 217 Figure 4-339 Figure 4-342 3) Remove the screw , and remove the harness guide Figure 4-340 4–25 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 218 , and remove the 3) Disconnect the two relay connectors driver PCB Figure 4-344 Figure 4-346 4–26 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 219: H. Paper Deck Pedestal-K
, and remove the stopper plate from both left and right. Figure 4-348 Figure 4-350 (right) 4–27 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 220 5) Remove the mounting screw from the front right, and remove the gear cover Figure 4-352 Figure 4-354 4–28 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 221 (front/rear in common). 9 10 Figure 4-356 Figure 4-358 4–29 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 222 , and Figure 4-362 remove the two support plates 5) Disconnect the four connectors Figure 4-360 4–30 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 223 3) Remove the pick-up roller arm and the weight from the pick-up roller shaft. Figure 4-366 Figure 4-364 4–31 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 224 Rear Front of copier Figure 4-368 Figure 4-370 4–32 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 225 Butted. Butted. Figure 4-372 4–33 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 226: Exposure System
Figure 4-402 Caution: Do not touch the halogen lamp. (If necessary, wrap lint-free paper around it.) 4–34 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 227 4) Remove the three screws , and remove the blank exposure lamp Figure 4-409a Figure 4-407 Figure 4-409b 4–35 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 228 1 mm Figure 4-411 Figure 4-413 6) Install the copyboard glass. 4–36 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 229 Figure 4-414 3) Install the lens heater with a screw 4) Connect the connector Figure 4-415 4–37 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 230: Charging System
5) Pull out the drum unit slowly to the front. Figure 4-502 4–38 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 231: Primary Charging Assembly
• When dry-wiping, move in one direction only. Figure 4-504 Figure 4-506 4–39 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 232: Transfer Charging Assembly
Do not touch the surface of the roller. Do not soil the surface of the roller. 4–40 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 233: Drum Heater
Caution: As necessary, keep the heater harness in place on the cord guide using tie-wraps. 4–41 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 234: Developing System
If the developing blade unit for the developing a ssembly aith the old type is removed, the old type can't be reattached. 4–42 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 235 7) Remove the developing cylinder terminal , roll case , and roll Figure 4-608 Figure 4-605 4–43 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 236 In other model, engage both ends of the blade assembly with the developing aseembly, and tighten the two screws Figure 4-613 4–44 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 237: Fixing System
4) Disconnect the three connectors , and re- move the screw Figure 4-701 Figure 4-703 4–45 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 238 5) Remove the two screws , and pull out the cleaning roller to the front. Figure 4-707 Figure 4-705 4–46 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 239 No. 304. (See the Service Handbook.) Caution: Do not touch the surface of the heater. Figure 4-710 4–47 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 240 6) Remove the fixing cleaning roller by lifting it. Take care so that the spring will not fly away. 4–48 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 241 • The machine picks up paper from the cassette, allows measurement as in Figure 4-718, and discharges paper. 4–49 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 242: Dc Controller Pcb
Figure 4-801 4) Disconnect the two AC connectors , and remove the two screws Figure 4-802 4–50 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 243: Ae Sensor Pcb
1. Points to Note When Replacing the AE Sensor • After replacement, perform the following: adjust AE 4–51 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 244 MECHANICAL SYSTEM 4–52 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 245 DIAGNOSTIC DEVICE II ......5-28 A. Unpacking .......... 5-28 B. Installing to the Copier ....... 5-28 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 247: Selecting The Site
A: 19.7in./50cm B: 3.9in./10cm Figure 5-101 5–1 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 248: Unpacking And Installing The Copier
• Keep the fixing stored for Screw possible relocation of the machine. 5–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 249 Remove the two pieces of card- board (spacer) from the feeding Spacer assembly. Spacer 5–3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 250 Engage the developing assembly. Close the copier’s top unit. 5–4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 251: Turning On The Copier
To enter the setting for IP_OFST, select ‘No. 314’ in service mode and work in the same way. 5–5 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 252 Attach the copy tray. Remove the door switch activator, and close the front door. 5–6 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 253: Checking The Images And Operations
Move the machine to its site of Make sure that the copier is more or less level. installation. 5–7 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 254: Attaching The Drum Unit
Be sure to insert the drum unit straight along the copier’s rail. Fill out the label, and attach it to the drum unit cover. 5–8 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 255: Changing The Cassette Size
Figure 5-202 Figure 5-204 5–9 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 256 Do not dry wipe or use solvent to clean the drum. 5–10 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 257: Relocating The Copier
Place 11 × 17/A3 copy paper on the copyboard glass, and tape the copyboard cover in place. 5–11 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 258: Replacing The Drum Unit
Fill out the label, and attach it to the drum unit cover. Lock the developing assembly. 5–12 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 259 Place the test sheet and check Follow image adjustment procedure. copy. (See the Service Handbook P.1-5.) 5–13 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 260: Installing The Control Card Iv N
10) Disconnect the copier’s dummy connector in the direction of the arrow using pliers or screwdriver. Figure 5-503 Figure 5-501 5–14 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 261 12) Connect the copier’s power plug, and turn on its power switch to check the operation of the Control Card IV N. 5–15 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 262: Cassette Heater Kit 5 Installation Procedure
Mounting plate 2 ....1 TP screw (white; M3×6) ..2 Relay harness ....... 1 5–16 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 263: Installation (To Copying Machine)
Support member Connector cover Connector Screw Figure 5-605 Figure 5-603 5–17 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 264 11) Open the copier’s top unit. side plate with two screws (white; M3×6). Screws Figure 5-607 5–18 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 265 Switch for the cassette heater Figure 5-609 13) Close the top unit of the copier. 5–19 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 266 (bottom holder). Screws Figure 5-612 5–20 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 267 • Cassette Feeding Module-A2/Cassette Feed- ing Unit-K1 Figure 5-616 Cord clamp Figure 5-614 5–21 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 268 Relay harness Figure 5-618 5–22 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 270: Cassette Heater Kit 7 Installation Procedure
Stay ........1 Cord clamp ......1 Relay harness ....... 1 Ratings label ......1 5–24 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 271: Installation
Rear cover Figure 5-705 Front upper cover Face plate Left cover Front left cover Figure 5-703 5–25 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 272 12) Slide in the copier’s bottom cassette. Screw Relay harness Heater Figure 5-707 5–26 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 273: Attaching The Ratings Label
2) Connect the heater’s power plug to the power outlet. 3) Turn on the heater’s power switch. 5–27 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 274: Viii.installing The Remote Diagnostic
Switch setting label ........ 1 pcs. Grounding wire* ........1 pc. Ferrite core ..........1 pc. *Not used. Fig. 5-803 5–28 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 275 ; use the screws removed from the copier. Modular Jack on the Right Fig. 5-805 Fig. 5-807 5–29 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 276 PCB as indicated in the table. LED4 Fig. 5-809 LED1 LED2 LED3 BAT1 LED5 LED6 LED4 Fig. 5-811 5–30 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 277 BAT1 LED5 LED6 LED4 LED1 LED2 LED3 BAT1 LED5 LED6 LED4 Fig. 5-813 Fig. 5-812 5–31 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 278 RDD’s PCB to OFF. Fig. 5-817 LED1 LED2 LED3 BAT1 LED5 LED6 LED4 Fig. 5-815 5–32 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 279 RDD and is not trapped by the top cover LED1 LED2 LED3 BAT1 LED5 LED6 LED4 Fig. 5-819 5–33 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 281 A. Scheduled Maintenance Work .... 6-5 B. Cassette Feeding Module-B2, Cassette Feeding Module-A2, and Cassette Feeding Unit-K1 .... 6-3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 283: Periodically Replaced Parts
Note: The above values are estimates only and subject to change based on future data. 6–1 COPYRIGHT © 1996 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 284: Durables And Consumables
Note: The above values are estimates only and subject to change based on future data. 6–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 285: Cassette Feeding Module-B2, Cassette Feeding Module-A2, And Cassette Feeding Unit-K1
Note: The above values are estimates only and subject to change based on future data. 6–3 COPYRIGHT © 1996 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 286: Basic Servicing
Record the latest counter reading. Fill out the Servicing Sheet, and report to the person in charge. 6–4 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 287: Servicing Chart
Use alcohol. Fixing feeding spacer assembly Delivery roll Set-back roller Duplexing Use alcohol. unit Re-pick-up roller 6–5 COPYRIGHT © 1996 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 288 MAINTENANCE AND SERVICING 6–6 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 289: K. Cassette Feeding Module-B2 Driver Circuit Diagram
S. SOLVENTS/OILS ........A-48 GENERAL CIRCUIT DIAGRAM ..... A-34 K. CASSETTE FEEDING MODULE-B2 DRIVER CIRCUIT DIAGRAM ....A-35 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 291: General Timing Chart
Cassette 1 pick-up clutch (CL2) Vertical path roller clutch Registration clutch (CL1) 25 0;Lqpplying solenoid (SL6) A–1 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 292: Signals And Abbreviations
CASSETTE SIZE signal 1 PUCLD1 CASSETTE1 PICK-UP CLUTCH DRIVE command CSZ2 CASSETTE SIZE signal 2 A–2 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 293 VERTICAL PATH2 PAPER DETECTION signal 3. Abbreviations AE ROTATION INTR INITIAL ROTATION LSTR LAST ROTATION SCFW SCANNER FORWARD SCRV SCANNER REVERSE STBY STANDBY A–3 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 295: General Circuit Diagram
APPENDIX C. GENERAL CIRCUIT DIAGRAM not available A–5 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 297: Dc Controller Circuit Diagram
R318 Q304 CLCK ADD[1..15] R347 ADD[0..14] ADD[1..18] C309 ADD[0..7] DATA[8..15] INDUCTOR C308 DATA[8..15] DATA[0..15] DATA[8..15] A–7 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 298 1/04 DATA12 ADD6 1/03 DATA11 C315 BAT301 ADD5 1/02 DATA10 ADD4 1/01 DATA9 ADD3 1/00 DATA8 ADD2 ADD1 Q300 ADD0 CSRAMOU RAMWR DATA[8..15] A–8 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 299 C379 C320 R370 X302 Q312E S-TXD Q314 R372 C321 C322 R371 R373 R374 R375 D-RXD C319 R376 Q312D D-TXD Q315 R377 R378 C323 A–9 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 300 ADD13 ADD12 ADD12 C330 INDUCTOR OPTPHA OPTPHB C325 OPTENB R384 ADD[11..15] ADD[11..15] CSRAMOU DATA[8..15] DATA[8..15] RAMWR INDUCTOR C326 R382 CSGA R380 CSRAM CLCK A–10 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 301 LENS-A R427 R398 TP13 Q319 R428 PT56 Q400 GND34 LENS-B GND34 R399 TP14 Q320 +24VF2 GND34 C390 C389 LENS-B R400 TP15 Q321 GND34 A–11 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 302 TCNTD R413 Q341 Q338G Q342 TCNTRPR Q343 R414 OPTPHB ZD301 Q401D Q338E Q401E PAPFAN FL-S Q401F R418 Q339 Q401G APGND R419 Q340 C397 A–12 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 303 PT11 PUCL Q363 R423 Q349C EEP-SCLK Q349E PT15 UPFED-CL Q364 R424 Q349D EEP-SO DPT-FAN Q349B R381 Q402 Q349F Q349G SOL-OIL R403 PT40 Q330 A–13 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 304 PT11 PUCL Q363 R423 Q349C EEP-SCLK Q349E PT15 UPFED-CL Q364 R424 Q349D EEP-SO DPT-FAN Q349B R381 Q402 Q349F Q349G SOL-OIL R403 PT40 Q330 A–14 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 305 R525 M[0..12] M[0..12] R517 DIPD-I DIPD R518 DEPD-I DEPD R519 DERS-I DERS R521 UP-FEDDT-I UP-FEDDT R523 LW-FEDDT-I LW-FEDDT C356 C358 C360 C361 C362 A–15 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 306 Q372 Q382C Q382 PT65 SEG10 Q382B C335 PT64 SEG11 Q382A PT63 SEG12 TD62380P Q382F PT62 SEG13 Q382G PT61 SEG14 Q382H PT60 SEG15 TD62380P A–16 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 307 D345 CCDT CPDU D363 MMLOCK D320 FACTORY R467 R468 D346 LWCSZ-1 D347 LWCSZ-2 D348 LWCSZ-3 D349 LWCSZ-4 D350 D319 D351 APS-L4 JPPGP M[6..12] A–17 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 308 C349 C379 R560 – Q387B R564 R405 R562 AE-DATA0 Q328A SW303 – – AE-DATA HTNG OPCNTCN2 OPCNTCN1 R565 SW DIP-2 R563 A-TH C380 A–18 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 309 MMLOCK UPFED-CL SEG5 LW-FEDDT 24V2 SEG6 R581 SEG7 SEG8 SEG9 CPDU SEG10 SEG11 SEG15 R583 SRG12 SEG14 RDROPN SRG13 PAP-EX J306 SRSW CCDT A–19 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 310 BLNKST-SL 24V2 J321 PR-EXP 24V2 24VF2 EXFAN 24V2 24VF2 J316 TRCLSL +24V2 R585 J322 24VF2 MFPWD 24VF2 MFPD R584 RGPD J317 S-TXD S-RXD A–20 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 311: Composite Power Supply Circuit Diagram
VCC-PRIN COLD-LINE HOT-LINE R220 R21 R20 -BATT R222 ZD11 R221 HEAT-PROT OVERC C140 R223 -BATT A–21 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 312 R27 24V +30VSEC VFEEDBK -BATT C139 +24VSEC + 5FBT R208 MRES R209 OVERC -BATT N.C. + 5FBT R210 VREF-UI OSC-UI R211 FAN-ON CP-DATAO A–22 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 313 AC-BCAS MRES H.V.GENERATOR MV-L ACBIAS-ON + 5FBT HV-L HV-H HV-L HV-H + 5FBT PRIMARY + 5FBT BIAS-S PDC-S HV-H HV-L P-CUR-S PDC-S P-CTRL-S A–23 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 314 CP-SIN + 5FBT CP-ACK CP-BATAO R201 R202 HEADER 17 FOR BRUSHLESS MOTOR CP-REO FL-LIGHT-ON MRES FL-LIGHT-ON * + 5FBT R203 FAN-ON FAN-EN FAN-EN A–24 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 315 T - FW - S C101 C100 U12B R152 C102 U10A U12A C103 C104 R153 T-CTRL-S R154 T - FEEDBACK C105 R155 C106 R156 A–25 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 316 BTA12-600C 24VAUX R179 R178 R181 R177 R217 C136 R218 C113 R182 C137 + C110 C111 1/2V NO FLAME R184 R204 FL-S R183 C112 A–26 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 317: Control Panel Key Pcb
J803 SEG9 R811 SEG10 R812 SEG11 R813 SEG12 R814 SEG13 R815 SEG14 DG0B DG1B DG2B A–27 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 319 R845 COMB-NUM ZOOM + ZOOM - CASS-SELEC Q814 DG6C DG6B D806 SW813 SW818 SW821 SW822 R830 R846 R831 R847 Q815 Q807 DG7B DG7C A–29 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 321: Ae Sensor Circuit Diagram
+24V R602 R605 PD601 J601 AEDATA C601 Q601 +24V R604 J601 AEREF Q601 C602 J601 A–31 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 322: Intensity Sensor Circuit Diagram
L401 140uH 7A Q403 AC INPUT CABLE C402 FROM POWER SUPPLY R406 R405 C401 BLACK A–32 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 323: Toner Level Detection Circuit Diagram
D762 D763 D752 D753 R771 VR762 R762 R751 R752 D761 D751 +24V C750 C751 J753 A–33 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 324: Cassette Feeding Module-B2 General Circuit Diagram
J218F SIZE3-1 SIZE4-1 Paper Size PCB2 Detector1 J115F J114F J115FP J115P Feed Feed Clutch1 Motor A–34 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 325: Cassette Feeding Module-B2 Driver Circuit Diagram
J115 CLUTCH1 Clutch 1 J115 MTR-B MTR-A to A503 MTR-COM C104 C103 C102 +34V C101 A–35 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 326 R108 R109 R110 Q101 R107 R131 C107 R103 R104 Q103 Q104 R105 C105 from A502 A–36 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 327: Cassette Feeding Module-A2 General Circuit Diagram
Door Open Detector J125F J114F J215FP J225FP F215P J225P Feed Feed Feed Clutch1 Clutch2 Motor A–37 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 328: Cassette Feeding Module-A2 Driver Circuit Diagram
J125 Clutch 1 MTR-B MTR-A to A503 C104 MTR-COM C103 R100 C102 +34V D120 C101 A–38 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 329 R108 R109 R110 Q101 R107 R131 C107 R103 R104 Q103 Q104 R105 C105 from A502 A–39 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 331: Cassette Feeding Unit-K1 General Circuit Diagram
Cassette 4 size Cassette 4 paper Cassette 4 vertical path door senson detection PCB detection detection A–41 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 332: Cassette Feeding Unit-K1
C4/5PD PAPER2/3 J103 C4/5PUCLD KS5/6 J103 MTRCOM Q103 Q104 Q107 Q117 R103 R104 to A504 A–42 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 333 A502 C110 Q110 R135 PAPER3 Q135 to A502 Q110 KS5/6 Q126 Q110 Q136 Q110 N.C. Q110 MTR-COM3 to A504 MTR-COM Q137 R105 A–43 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 334 C309 C310 J134 C307 OUTA J134 R305 OUTB R331 R332 COM B VrefB J134 C305 C311 C312 C308 OUTB J134 J134 N.C. J134 A–44 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Page 335: Paper Deck Pedestal-K1 General Circuit Diagram
DEPRL FGND Deck lifter drive clutch J87R J87F J87P SL11 Deck pick-up roller release solenoid A–45 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 336: Paper Deck Pedestal-K1 Driver Circuit Diagram
Q112 R105 C105 +34V Q109 J101 R111 D113 R103 R109 Q114 C103 C104 Q113 Q115 A–46 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 337: Special Tools
For fixing the scanning Pulley clip FY9-3010-000 cable in place. (front, rear) A–47 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 338: Solvents/Oils
Tool No.: CK-0551 (20g) grease friction parts Conductive Silicone oil Tool No.: CK-0438 (100g) grease A–48 COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 339 Printed in Japan REVISION 0 (FEB. 1998) (31625) 5-1, Hakusan 7-chome, Toride-shi Ibaraki, 302 -0023 Japan © COPYRIGHT 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON) Download service manual and resetter printer at http://printer1.blogspot.com...
Page 340 This publication is printed on 70% reprocessed paper. PRINTED IN JAPAN (IMPRIME AU JAPON) 0398S1.11-1 Download service manual and resetter printer at http://printer1.blogspot.com...

Canon NP6621 Service Manual

Table of Contents

Chapter 2 Copying Process

Chapter 3 Operations and Timing

Chapter 4 Mechanical System

Chapter 5 Installation

Chapter 6 Maintenance and Servicing

Appendix

Quick Links

Chapters

Related Manuals for Canon NP6621

Summary of Contents for Canon NP6621