Canon DU-82 Service Manual
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Canon DU-82 Service Manual

Canon DU-82 Service Manual

Duplexing unit
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DUPLEXING UNIT
SERVICE
MANUAL
REVISION 0
RY8-1396-000
JAN. 1999
©
COPYRIGHT
1999 CANON INC.
CANON DUPLEXING UNIT DU-82 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

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  • Page 1 DUPLEXING UNIT SERVICE MANUAL REVISION 0 RY8-1396-000 JAN. 1999 © COPYRIGHT 1999 CANON INC. CANON DUPLEXING UNIT DU-82 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
  • Page 2 COPYRIGHT © 1999 CANON INC Printed in Japan Imprimé au Japon Use of this manual should be strictly supervised to avoid disclosure confidential information. Prepared by PERIPHERAL PRODUCTS QUALITY PLANNING DIV. PERIPHERAL PRODUCTS TECHNICAL DOCUMENTATION DEPT. CANON INC. 5-1, Hakusan 7-chome, Toride-City, Ibaraki-Pref. 302-8501, Japan...

  • Page 3: Chapter 1 Product Information

    PREFACE This Service Manual contains basic information required for after -sales service of the Duplexing unit DU-82. This information is vital to the service technician in maintaining the high print quality and performance of the duplexing unit. This manual consists of the following chapters:...
  • Page 4 DTP system This manual was produced on an Apple PowerMacintosh 9500/200 personal computer and output by an Apple LaserWriter 16/600 PS laser beam printer; final pages were printed on AGFA Selectset avantra 25. All graphics were produced with Macromedia FreeHand (J), and all documents and page layouts were created with QuarkXPress (E).

  • Page 5: Table Of Contents

    CONTENTS CHAPTER 1 PRODUCT INFORMATION FEATURES ......1-1 A. External Views ....1-3 SPECIFICATIONS....1-2 B. Cross Sectional Views..1-3 III. PARTS OF THE DUPLEXING IV. INSTALLATION ....... 1-4 UNIT ........1-3 CHAPTER 2 OPERATION AND TIMING BASIC OPERATION ....2-1 PAPER PICK-UP/FEED A.
  • Page 6 VII. MEASUREMENT AND B. Expected Lives of Consumable ADJUSTMENT ......4-11 Parts ......... 4-12 A. Mechanical Adjustment ..4-11 C. Regular Servicing B. Electrical Adjustment..4-11 Schedule ......4-12 C. Variable resistors, LEDs, D. Standard Tools ....4-12 test pins, jumpers, and E.
  • Page 7 CHAPTER 1 PRODUCT INFORMATION FEATURES ......1-1 III. PARTS OF THE DUPLEXING SPECIFICATIONS....1-2 UNIT ........1-3 IV. INSTALLATION ....... 1-4...

  • Page 9: Features

    CHAPTER 1 I. FEATURES 1. Optional built-in type duplexing unit The duplexing unit is compact in size and can be installed inside the printer. 1 - 1...

  • Page 10: Specifications

    CHAPTER 1 II. SPECIFICATIONS 1. Print paper A3, A4, B4, A5, B5, Ledger, Legal, Letter and Executive size plain paper (64g/m - 105g/m recommended paper) 2. Power supply DC24V (supplied from printer) 379 (W) × 423 (D) × 82 (H) mm 3.

  • Page 11: Parts Of The Duplexing Unit

    CHAPTER 1 III. PARTS OF THE DUPLEXING UNIT A. External Views 1: Side registration guide 2: Pick-up guide plate 3: Duplex feed roller 1 4: Duplexing unit removal lever Figure 1-3-1 B. Cross Sectional Views 1: Reversing roller pressure release plate 2: Reversing sensor 3: Duplex pick-up sensor lever 4: Duplex feed roller 2...

  • Page 12: Iv. Installation

    CHAPTER 1 IV. INSTALLATION Condensation will form on metal surfaces when brought into a warm room from the cold. Condensation in the duplexing unit can cause various troubles, such as paper feeding failure. Therefore, when moving the duplexing unit to a warm environment, leave it packed in its box for at least an hour to acclimatize to room temperature.

  • Page 13: Chapter 2 Operation And Timing

    CHAPTER 2 OPERATION AND TIMING 1. This chapter describes the duplexing unit functions, the relationships between mechanisms and circuits, and the timing of operations. Mechanical linkages are indicated by black and white lines ( ), the flow of control signals by solid arrows ( ), and the flow of groups of signals by outline arrows ( 2.

  • Page 15: Basic Operation

    CHAPTER 2 I. BASIC OPERATION A. Outline of the Electrical System The duplexing unit inverts the print paper and feeds it to the printer. The duplexing unit is controlled with various commands sent from the DC controller PCB in the printer. The duplexing driver PCB controls the sequence of duplexing unit operations.

  • Page 16: Duplexing Driver Input Signals

    CHAPTER 2 B. Duplexing Driver Input Signals Duplexing driver PCB PS24 J20-3 J2008-1 Duplexing /DUPPS "L" when the sensor detects paper. unit paper sensor PS25 J21-3 J2006-1 Side regist- HREGS "H" when the sensor detects home ration guide position of the side registration home position guide.
  • Page 17 CHAPTER 2 C. Duplexing Driver Output Signals Duplexing driver PCB +24VA J2009-2 Reversing roller release /PRRESLD When "L", pressure is relased from solenoid the reversing roller. +24VA J2002-2 Duplex deflector solenoid /DUPSLD When "L", paper enters the duplexing unit. +24VA +24VA J2003-2 Duplex feed...

  • Page 18: Paper Pick-Up/Feed System

    CHAPTER 2 II. PAPER PICK-UP/FEED SYSTEM A. Operation 1. Outline The print paper is guided to the reversing unit in the printer through the duplexing unit with the duplex deflector. The paper fed to the reversing unit is transported to the duplexing unit by changing the feed- ing direction with the reversing roller.
  • Page 19 CHAPTER 2 DC controller PCB Serial line Duplexing driver Fixing delivery Duplex Second-pass pick-up wait position roller deflector Duplex feed Reversing Feed roller 2 roller 1 roller pressure PS25 PS26 PS23 release plate PS24 Duplex Reversing lower roller guide Side registration Duplex guide feed...
  • Page 20 CHAPTER 2 1: Reversing roller pressure release plate 2: Reversing roller release solenoid 3: Duplexing unit motor 4: Duplex deflector solenoid 5: Duplex feed roller 1 home position sensor 6: Side registration guide 7: Duplexing unit paper sensor 8: Duplex feed roller 1 9: Duplex feed clutch 10: Side registration guide home position sensor 11: Reversing sensor...
  • Page 21 CHAPTER 2 2. Reversing Operation When the duplexing driver receives a duplex unit specification command from the printer, it turns the duplex deflector solenoid (SL6) ON. This drives the printer duplex deflector to feed the print paper to the duplexing unit. When the leading edge of the paper is detected by the reversing sensor (PS26), the duplexing driver turns the reversing motor (M8) counterclockwise (CCW) (Note) to feed the paper to the printer reversing unit.
  • Page 22 CHAPTER 2 3. Side Registration Adjustment This printer adjusts the side registration so that the center of the second page in the horizontal direction matches the center of the printable area on the drum during duplex printing. This adjustment is done by pushing the side registration guide to both sides of the print paper. The side registration guide home position sensor (PS25) detects whether the side registration guide is at its home position.
  • Page 23 CHAPTER 2 4. Duplex Pick-UP Operation The duplexing driver turns ON the duplex feed clutch (CL5) after it completes the side registra- tion adjustment. When the paper size is not A4 (landscape), Letter (landscape) or A5, the duplexing driver turns OFF the reversing roller release solenoid (SL7) in a specified period of time after the duplexing unit paper sensor (PS24) detects the leading edge of the paper.

  • Page 24: Paper Jam Detection

    CHAPTER 2 B. Paper Jam Detection To detect presence of the paper and whether the paper has been correctly fed, the following paper sensors are provided: • Duplexing unit paper sensor (PS24) • Reversing sensor (PS26) The microcomputer (CPU) on the duplexing driver PCB determines whether or not a paper jam has occurred by monitoring the paper at each of the sensors according to the pre-set 'check timing' in the memory.
  • Page 25 CHAPTER 3 THE MECHANICAL SYSTEM PREFACE ......3-1 IV. CLUTCH/SOLENOIDS .... 3-8 EXTERNALS ......3-2 MOTORS ....... 3-12 III. SENSORS ......3-5 VI. ELECTRICAL PARTS ....3-14...

  • Page 27: I. Preface

    CHAPTER 3 I. PREFACE This chapter describes the disassembly and reassembly procedures of the duplexing unit. The service technician is to identify the cause of malfunction according to "Chapter 4 Troubleshooting" and to replace the defective part(s) following the disassembly procedure of each part.

  • Page 28: Ii. Externals

    CHAPTER 3 II. EXTERNALS A. Locations Upper guide Lower guide PCB cover Figure 3-2-1 Following the procedures described in this section, remove the covers when cleaning or check- ing inside the duplexing unit. 3 - 2...
  • Page 29 CHAPTER 3 B. External Covers 2. Lower guide 1. Upper guide 1) Remove the upper guide. 1) Remove the 4 screws, then the upper 2) Remove the connector, and take out the guide. 2 screws, then the guide. Screws Upper guide Connector Screws Guide...
  • Page 30 CHAPTER 3 4) Remove the screw. 3. PCB cover 1) Remove the 2 screws and then the PCB cover. Screw Screws PCB cover Figure 3-2-6 Figure 3-2-8 5) Remove the 2 screws, then the lower guide. Screws Lower guide Figure 3-2-7 Note: The 2 springs differ from each other in terms of tension and color.

  • Page 31: Iii. Sensors

    CHAPTER 3 III. SENSORS A. Locations Duplex feed roller 1 home position sensor Duplexing unit paper sensor Side registration guide home position sensor Reversing sensor Figure 3-3-1 3 - 5...
  • Page 32 CHAPTER 3 B. Duplex Feed Roller 1 Home Position C. Duplexing Unit Paper Sensor Sensor 1) Performing Step 1) on Page 3-4, remove 1) Performing Step 1) on Page 3-3, remove the PCB cover. the upper guide. 2) Disconnect the connector, and then 2) Remove the sensor mounting plate after remove the duplexing unit paper sensor.
  • Page 33 CHAPTER 3 D. Side Registration Guide Home E. Reversing Sensor Position Sensor 1) Performing Step 1) on Page 3-3, remove 1) Performing Step 1) on Page 3-3, remove the upper guide. the upper guide. 2) Disconnect the connector, and then 2) Disconnect the connector, and then remove the reversing sensor.

  • Page 34: Clutch/Solenoids

    CHAPTER 3 IV. CLUTCH/SOLENOIDS A. Locations Reversing roller release solenoid Duplex deflector solenoid Duplex feed clutch Figure 3-4-1 3 - 8...

  • Page 35: Reversing Roller Release Solenoid

    CHAPTER 3 B. Reversing Roller Release Solenoid 5) Remove the cable from the cable guide, 1) Performing Step 1) to 5) on Page 3-3, and then take out the reversing roller remove the lower guide. release solenoid. 2) Take out the PCB cover. 3) Remove the connector.

  • Page 36: Duplex Deflector Solenoid

    CHAPTER 3 C. Duplex Deflector Solenoid 5) Remove the 2 screws, and take off the 1) Performing Step 1) on Page 3-3, remove motor fixing plate. the upper guide. 2) Remove the PCB cover, and the 4 con- nectors. Screws Motor fixing plate Connectors Figure 3-4-7...

  • Page 37: Duplex Feed Clutch

    CHAPTER 3 7) Remove the 2 screws and take off the D. Duplex Feed Clutch duplex deflector solenoid. 1) Performing Step 1) on Page 3-3, remove the upper guide. 2) Take off the PCB cover and undo the connector. Screws Duplex deflector solenoid Connector Figure 3-4-9...

  • Page 38: Motors

    CHAPTER 3 V. MOTORS A. Locations Duplexing unit motor Side registration motor Figure 3-5-1 3 - 12...

  • Page 39: Duplexing Unit Motor

    CHAPTER 3 B. Duplexing Unit Motor C. Side Registration Motor 1) Performing Step 1) on Page 3-3, remove 1) Performing Step 1) to 5) on Page 3-3, the upper guide. remove the lower guide. 2) Take off the PCB cover and remove the 2) Take off the PCB cover, then remove the connector.

  • Page 40: Electrical Parts

    CHAPTER 3 VI. ELECTRICAL PARTS A. Locations Duplexing driver PCB Figure 3-6-1 3 - 14...

  • Page 41: Duplexing Driver Pcb

    CHAPTER 3 B. Duplexing Driver PCB 1) Performing Step 1) on Page 3-4, remove the PCB cover. 2) Disconnect the 9 connectors, unhook the 2 claws, and then remove the duplexing driver PCB. Connectors Claws Duplexing driver PCB Figure 3-6-2 3 - 15...
  • Page 43 CHAPTER 4 TROUBLESHOOTING PREFACE ....... 4-1 VI. MALFUNCTION STATUS IMAGE DEFECTS....4-4 TROUBLESHOOTING ....4-9 III. PAPER JAMS ......4-5 VII. MEASUREMENT AND IV. PAPER TRANSPORT ADJUSTMENT ......4-11 MALFUNCTION ....... 4-6 VIII. MAINTENANCE AND MALFUNCTION SERVICING......4-12 TROUBLESHOOTING ....4-7 IX.

  • Page 45: Preface

    CHAPTER 4 I. PREFACE A. Malfunction Diagnosis Flowchart The malfunctions that occur in the duplexing unit are classified into five types; "image defects", "paper jams", "paper transport malfunction", "operation malfunction", and "malfunction status". If a malfunction occurred in the duplexing unit, the service technician is to find which type the malfunction falls into using the malfunction diagnosis flowchart and to clear the problem according to the troubleshooting procedures for each malfunction type.
  • Page 46 CHAPTER 4 Initial check execution Power ON Refer to the item, Displays "operator call" Displays "READY"? "malfunction troubleshooting" or "service call" Refer to the item, "malfunction Can duplex printing status troubleshooting" be executed ? Execute a duplex printing Occurs paper jam? Refer to the item, "paper jams"...
  • Page 47 CHAPTER 4 B. Initial Checks 1. Installation environment The same as that of the printer. 2. Paper checks a. The paper recommended for the duplexing unit is used. b. The paper is not damp. 3. Others During winter, particularly when moving the duplexing unit into a warm room from a cold loca- tion such as warehouse, condensation can appear in the duplexing unit.

  • Page 48: Image Defects

    CHAPTER 4 II. IMAGE DEFECTS I-1 Dirt <Possible causes> 1. The duplex feed roller 1 is dirty Action: Clean the duplex feed roller 1. 2. The feed guide is dirty Action: Clean the feed guide. 3. The reversing roller and the duplex feed roller 2 are dirty Action: Clean the dirty rollers.

  • Page 49: Paper Jams

    CHAPTER 4 III. PAPER JAMS <Possible causes> 1. Paper particles or dust is on each roller. Action: Remove the paper particles or dust. 2. Foreign substances or burrs are on the feed guide. Action: Remove the foreign substances. If the feed guide suffers from burr, replace it. 3.

  • Page 50: Paper Transport Malfunction

    CHAPTER 4 IV. PAPER TRANSPORT MALFUNCTION T-1Wrinkles <Possible causes> 1. The feed roller unit or the side registration guide has paper particles or dust. Action: Clean the dirty place. 2. Rollers are worn or deformed. Action: Check the rollers and replace if any roll is worn or deformed. 3.

  • Page 51: Malfunction Troubleshooting

    CHAPTER 4 V. MALFUNCTION TROUBLESHOOTING N-1 Power ON failure <Possible causes> 1. The duplexing unit is not set correctly. Action: Re-set it. 2. Poor connection with the connector of 24 V supply line. Action: Reconnect the connector J2001 on the duplexing driver PCB correctly. 3.
  • Page 52 CHAPTER 4 N-5 The duplex deflector solenoid failure <Possible causes> 1. Poor connection with the connector of the DUPLEX DEFLECTOR SOLENOID DRIVE signal line. Action: Reconnect the connector J2002 of the duplexing driver PCB correctly. 2. The duplex deflector solenoid failure Action: Disconnect the connector J2002 of the duplex deflector solenoid.

  • Page 53: Malfunction Status Troubleshooting

    CHAPTER 4 VI. MALFUNCTION STATUS TROUBLESHOOTING M-1 Side registration guide failure <Possible causes> 1. The side registration guide installation failure Action: Re-install the side registration guide correctly. 2. The side registration guide home position sensor lever is damaged. Action: Replace it. 3.
  • Page 54 CHAPTER 4 7. The duplexing driver PCB failure Action: Replace it. M-3 "Duplexing unit installation failure status" is output when the duplexing unit is installed in the printer. <Possible causes> 1. Poor connection in the connector. Action: Reconnect the connector J2001 on the duplexing driver PCB. 2.

  • Page 55: Measurement And Adjustment

    CHAPTER 4 VII. MEASUREMENT AND ADJUSTMENT A. Mechanical Adjustment This duplexing unit has no item for mechanical adjustment. B. Electrical Adjustment This duplexing unit has no item for electrical adjustment. C. Variable resistors, LEDs, test pins, jumpers, and switches on PCB This duplexing unit has no variable resistors, LEDs, test pins, jumpers, and switches that are required for after-sales-service of the unit.

  • Page 56: Maintenance And Servicing

    CHAPTER 4 VIII. MAINTENANCE AND SERVICING A. Periodic Replacement Parts This duplexing unit has no periodic replacement parts. Note: Periodic replacement parts are the parts that must be replaced at regular intervals, even if they are functioning properly and show no signs of wear. (Failure of these parts can seriously affect printer performance.) These parts should be replaced during a regular service visit closest to the end of the parts expected life.

  • Page 57: Location Of Connectors

    CHAPTER 4 IX. LOCATION OF CONNECTORS J2009 J2005 J2008 J2007 J2001 J2004 J2002 J2006 J2003 Figure 4-9-1 4 - 13...

  • Page 59: Appendix

    APPENDIX GENERAL TIMING CHART ..A-1 III. LIST OF SIGNALS ....A-3 GENERAL CIRCUIT DIAGRAM A-2...
  • Page 61 I. GENERAL TIMING CHART • Timing chart for two consecutive prints on A4 landscape paper (Unit: Seconds) Sequence PRINT PRINT signal (/PRNT) About 0.9 Normal speed High speed Duplexing unit motor (M8) Duplex deflector solenoid (SL6) About 2.7 Duplex feed clutch (CL5) About 0.1 Fixing unit delivery sensor (Note) About 0.9...

  • Page 62: Ii. General Circuit Diagram

    II. GENERAL CIRCUIT DIAGRAM Side registration Duplexing unit Duplex feed roller Reversing guide home paper sensor 1 home position sensor position sensor sensor PS24 PS25 PS26 PS23 Reversing roller release solenoid J2001 /DUPCLK Duplexing driver PCB DUPCMD /DUPSTS /DUPIDS +24VA +24VA Duplex deflector Duplex feed...
  • Page 63 APPENDIX III. LIST OF SIGNALS A. Input/Output Signals for the Duplexing Driver PCB Connector Code Logic Signal name J2001 +24VA Input +24VA Input /DUPIDS Output Duplexing unit detection signal /DUPSTS Output Duplexing unit status signal DUPCMD Input Duplexing unit command signal /DUPCLK Input Status clock signal...
  • Page 65 Prepared by PERIPHERAL PRODUCTS QUALITY PLANNING DIV. PERIPHERAL PRODUCTS TECHNICAL DOCUMENTATION DEPT. CANON INC Printed in Japan REVISION 0 ( JAN. 1999 ) 5-1, Hakusan 7–chome, Toride-City, Ibaraki-Pref. 302-8501, Japan...
  • Page 66 The printing paper contains 70% waste paper. PRINTED IN JAPAN (IMPRIME AU JAPON) 0199AB0.70 CANON INC.

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