Brother MFC7050C Service Manual
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Brother MFC7050C Service Manual

Brother MFC7050C Service Manual

Facsimile equipment
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FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL:
MFC7050C

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  • Page 1 FACSIMILE EQUIPMENT SERVICE MANUAL MODEL: MFC7050C...
  • Page 2 © Copyright Brother 1999 All rights reserved. No part of this publication may be reproduced in any form or by any means without permission in writing from the publisher. Specifications are subject to change without notice.
  • Page 3 PREFACE This publication is a Service Manual covering the specifications, construction, theory of operation, and maintenance of the Brother facsimile equipment. It includes information required for field troubleshooting and repair--disassembly, reassembly, and lubrication--so that service personnel will be able to understand equipment function, to rapidly repair the equipment and order any necessary spare parts.
  • Page 4 CHAPTER I. GENERAL DESCRIPTION...
  • Page 5 CONTENTS EQUIPMENT OUTLINE ..................I-1 1.1 External Appearance and Weight..............I-1 1.2 Components ....................I-1 SPECIFICATIONS ....................I-2...

  • Page 6: Equipment Outline

    EQUIPMENT OUTLINE External Appearance and Weight The figure below shows the equipment appearance and approximate dimensions. Weight: Machine proper Approx. 7 kg In package Approx. 11 kg Components The equipment consists of the following major components: I - 1...

  • Page 7: Specifications

    SPECIFICATIONS (1/3) Model MFC7050C Color White (1138) PRINTER Engine Type Thermal ink jet Print Speed (ppm) Up to 6 ppm/Mono, 300 x 600 Up to 3 ppm/Color Resolution (dpi) 1200 x 1200, 600 x 600, 300 x 600 Emulation Printer Driver Windows 3.1/3.11, Windows 95/98,...
  • Page 8 (2/3) Model MFC7050C Error Correction Mode (ECM) Transmission Speed (sec.) Gray Scale 256 (Error Diffusion) Super Fine Yes (Send and Receive) Multi-resolution TX Handset Speaker Phone One-touch Dial 12 X 2 Speed Dial Tel-Index Chain Dialing Contrast Text (Light/Normal/Dark) FAX/TEL Switch...
  • Page 9 (3/3) Model MFC7050C Message Center Voice-on-demand FAX Forwarding FAX Retrieval Message Center (PC MC) ICM Recording Time Fax-on-demand Voice-on-demand Fax & Voice Mail Box FAX Forwarding General/Additional Feature Energy Star Compliance Memory (Standard) 2 MB Memory (Opt Upgrade) Simultaneous Operation...
  • Page 10 CHAPTER II. INSTALLATION...
  • Page 11 CONTENTS INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT....II-1...
  • Page 12 INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT The facsimile equipment is available in two types--one with a flash ROM and the other with a masked ROM. For the equipment with a flash ROM, if the program version is updated or the main PCB is replaced, install the update program onto the flash ROM on the main PCB.
  • Page 13 Installing the update data onto the flash ROM of the facsimile equipment During this procedure, do not disconnect the power cord or interface cable from the facsimile equipment. Insert the floppy disk which stores the update data and transfer utility into the floppy disk drive of your computer.
  • Page 14 CHAPTER III. THEORY OF OPERATION...

  • Page 15: Table Of Contents

    CONTENTS OVERVIEW......................III-1 MECHANISMS...................... III-2 2.1 Scanner Mechanism ..................III-3 2.1.1 Document feeding and ejecting mechanism .......... III-4 2.1.2 Scanner ....................III-4 2.2 Ink Jet Printing Mechanism................III-5 2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanisms... III-5 2.2.2 Ink jet printing and capping mechanisms ..........III-8 2.2.3 Carrier drive mechanism ...............

  • Page 16: Overview

    1. OVERVIEW III - 1...

  • Page 17: Mechanisms

    2. MECHANISMS The equipment is classified into the following mechanisms: n SCANNER MECHANISM – Document feeding and ejecting mechanism – Document scanning mechanism n INK JET PRINTING MECHANISM – Paper pulling-in, registration, feeding, and ejecting mechanisms – Ink jet printing and head capping mechanisms –...

  • Page 18: Scanner Mechanism

    Scanner Mechanism This mechanism consists of the top cover, automatic document feeder (ADF), document feed roller ASSY, document ejection roller ASSY, and document sensors. (For details about the sensors, refer to Section 2.3.) If the operator sets documents on the top cover and starts the scanning operation, the scanner motor rotates so that the ADF (which consists of the separation roller ASSY and ADF parts) feeds those documents into the equipment, starting from the bottom sheet to the top, page by page.

  • Page 19: Document Feeding And Ejecting Mechanism

    2.1.1 Document feeding and ejecting mechanism To feed and eject documents, the scanner motor rotates counterclockwise. It rotates the sun gear 19/55 clockwise so that the planet gear 23 ASSY transmits the torque to the gear 19/47 and its gear train. After completion of paper ejection, the scanner motor rotates clockwise in order to disengage the planet gear 23 ASSY from the gear 19/47.

  • Page 20: Ink Jet Printing Mechanism

    Ink Jet Printing Mechanism 2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanisms The paper pulling-in, registration, feeding, and ejecting mechanisms are driven by a single paper feed motor. III - 5...
  • Page 21 Paper pulling-in and registration mechanism If the paper feed motor rotates clockwise, the rotational torque is transmitted via the gear train to the supply gear built in the auto sheet feeder (ASF). The supply gear rotates once counterclockwise to pull in paper from the ASF, a sheet at a time. Since the gear is a sector gear, it will stop when the toothless section comes to the joint with the mating middle gear B (idle gear).
  • Page 22 Paper feeding and ejecting mechanism If the paper feed motor rotates counterclockwise, the rotational torque is transmitted via the gear train to the feed gear that rotates clockwise to feed paper. The torque is further transmitted via the middle gears to the exit gear. After the paper passes through the print head, it will be ejected onto the paper tray.

  • Page 23: Ink Jet Printing And Capping Mechanisms

    2.2.2 Ink jet printing and capping mechanisms (1) Ink jet printing This equipment uses drop-on-demand ink jet printing. The black cartridge and color cartridge install in the carrier, each of which has an embedded thermal ink-jet head. The dual heads provide color and true black printing without changing ink cartridges.
  • Page 24 (2) Head capping and cleaning with head wipers Shown below are head capping and cleaning mechanisms. Upon completion of printing, the carrier travels rightwards to the home position and moves the head cap lever of the head cap unit to the right, bringing the head cap unit up to the position where the head caps come into tight contact with the print heads.

  • Page 25: Carrier Drive Mechanism

    2.2.3 Carrier drive mechanism The carrier transport motor controls horizontal motion. The motor rotation is transmitted via the motor pulley to the timing belt. The carrier, which is supported and guided by the main shaft, is secured to the timing belt. Clockwise and counterclockwise rotations of the carrier transport motor move the carrier to the right and left, respectively.

  • Page 26: Sensors And Actuators

    Sensors and Actuators This equipment has the following sensors: Sensor name Type Located on Hook switch sensor Mechanical switch Hook switch PCB in the handset mount Cover sensor Mechanical switch Cover sensor PCB Registration sensor Photosensor Main PCB Document front sensor Photosensor Document sensor PCB of the control panel PCB ASSY...
  • Page 27 Location of Sensors and Actuators III - 12...

  • Page 28: Control Electronics

    3. CONTROL ELECTRONICS Configuration The hardware configuration of the facsimile equipment is shown below. *1 On the main PCB is the registration sensor. *2 On the cover sensor PCB is the cover sensor. *3 On the hook switch PCB is the hook switch sensor. *4 On the document sensor PCB are these sensors: •...

  • Page 29: Main Pcb

    Main PCB The main PCB, which is the nucleus controlling the entire operation of the equipment, consists of an ASIC, gate array, memories, MODEM, motor drive circuitry, sensor detection circuitry, and analog circuits for scanning and printing. Block Diagram of Main PCB III - 14...
  • Page 30 III - 15...

  • Page 31: Ncu Pcb

    NCU PCB The NCU PCB switches the communications line to telephone or built-in MODEM, under the control of the main PCB. III - 16...

  • Page 32: Control Panel Pcb

    Control Panel PCB The control panel PCB and the main PCB communicate with each other by serially transmitting commands and data. The control panel unit consists of a gate array, an LCD and LEDs, which are controlled by the gate array according to commands issued from the control CPU on the main PCB.

  • Page 33: Power Supply Pcb

    Power Supply PCB The power supply uses the switching regulator to generate DC power (+30V and +5V) from a commercial AC power line. Both the +30V and +5V DC supplies are fed via the interface PCB to the main PCB. The +30V source is stabilized and fed to the scanner motor (for advancing documents), paper feed motor (for feeding documents and recording paper), carrier transport motor (for moving the carrier), thermal ink-jet print heads, and LED array of the CIS unit.

  • Page 34: Interface Pcb

    Interface PCB This PCB interfaces the main PCB and the externally connected computer with each other. The interface PCB also generates +22V and +11.75V supplies from the +30V source and +3.3V supply from the +5V source, and then feeds them to the main PCB. The +22V and +11.75V sources are stabilized and fed to the thermal ink-jet print heads embedded in the ink cartridges and the head driver IC on the main PCB.
  • Page 35 CHAPTER IV. DISASSEMBLY/REASSEMBLY AND LUBRICATION...
  • Page 36 CONTENTS DISASSEMBLY/REASSEMBLY ................IV-1 Safety Precautions....................IV-1 Tightening Torque List ..................IV-2 Preparation ......................IV-3 How to Access the Object Component ..............IV-3 Disassembly Order Flow ..................IV-4 Ink Cartridges ....................IV-5 Interlock Keys....................IV-7 Control Panel ASSY ..................IV-8 Panel Rear Cover and Control Panel..............
  • Page 37 1.27 Pinch Roller ASSYs..................IV-49 1.28 Sensor Lever (Registration sensor actuator) ........... IV-50 1.29 Earth Spring ....................IV-51 1.30 Exit Roller and Base Frame................IV-52 1.31 Large Feed Roller ASSY ................IV-54 1.32 Gear Plate ASSY.................... IV-55 1.33 Ink Foam ......................IV-56 1.34 Harness Routing.....................

  • Page 38: Disassembly/Reassembly

    DISASSEMBLY/REASSEMBLY n Safety Precautions To prevent the creation of secondary problems by mishandling, observe the following precautions during maintenance work. (1) Unplug the power cord from the power outlet before replacing parts or units. When having access to the power supply, be sure to unplug the power cord from the power outlet. (2) Be careful not to lose screws, washers, or other parts removed for parts replacement.

  • Page 39: Tightening Torque List

    Tightening Torque List Location Screw type Q'ty Tightening torque Loosening torque N•cm (kg•cm) N•cm (kg•cm) ADF parts Taptite, pan (washer) B M3x6 39 ±10 (4 ±1) 20 to 59 (2 to 6) Panel rear cover Taptite, cup B M3x8 59 ±20 (6 ±2) Min.

  • Page 40: Preparation

    Preparation Prior to proceeding to the disassembly procedure, (1) Unplug - the modular jack of the telephone line, - the modular jack of the curled cord (and remove the handset), - the PC interface cable, and - the modular jack of an external telephone set if connected. (Not shown below.) (2) Remove - the document wire extension - the document tray,...

  • Page 41: Disassembly Order Flow

    Disassembly Order Flow IV - 4...

  • Page 42: Ink Cartridges

    Ink Cartridges During disassembly jobs, both of the ink cartridges should be removed. The following procedure should apply only when you need to make operation checks. If you have initialized the EEPROM, plugging the power cord into an electrical socket will show the "SET CARTRIDGES"...
  • Page 43 (2) If no ink cartridge has been loaded, load a black ink cartridge and color ink cartridge into the slots and press them to the rear until they snap into place. NOTE: Black ink cartridges should be loaded in the right slot, and color ink cartridges should be in the left slot.

  • Page 44: Interlock Keys

    Interlock Keys (1) Remove the interlock keys from the carrier. Reassembling Notes • Set the violet interlock key at the left and the gray one at the right. • As shown above, fit the boss of each interlock key in the hole provided on the carrier. IV - 7...

  • Page 45: Control Panel Assy

    Control Panel ASSY (1) Slightly open the control panel ASSY. (2) Push the right and left arms of the control panel ASSY outwards (in the direction of arrow •) with your thumbs and open the control panel ASSY further (arrow ‚) to unhook those arms from bosses "x"...

  • Page 46: Panel Rear Cover And Control Panel

    Panel Rear Cover and Control Panel (1) Place the control panel ASSY upside down. If you do not need to remove the ADF parts, antistatic brush, shield film, document pressure bar, or document rear sensor actuator, skip to step (6), (2) To remove the ADF parts (spring plates, separation rubber and anti-vibration rubber), remove the screw.
  • Page 47 (6) Remove the two screws from the panel rear cover. (7) Unhook the panel rear cover from eight "X" latches provided on the control panel and lift up the panel rear cover. (8) Fully turn the document front sensor actuator to the rear and lift it up. (9) Unhook the document sensor PCB from two "Y"...
  • Page 48 (12) As shown below, insert the tip of a flat screwdriver under clamp "A" from the rear and push up clamp "A" slightly to release the LCD, and then take out the LCD while pulling the LCD flat cable gently. NOTE: Do not take out the LCD except when the LCD is defective and requires replacement.

  • Page 49: Document Feed Roller Assy And Document Ejection Roller Assy

    Document Feed Roller ASSY and Document Ejection Roller ASSY (1) Lightly push down arm rib "a" and shift the document feed roller ASSY to the right and upwards. (2) Lightly push down arm rib "b" and shift the document ejection roller ASSY to the right and upwards, without removing the shield film.

  • Page 50: Scanner Frame Assy

    Scanner Frame ASSY (1) You can remove the following parts from the top of the scanner frame ASSY without taking out the ASSY from the top cover. • CIS film • Shield film • CIS unit (shown on the next page). Lightly pull up the arm, move the CIS unit to the left, and lift up the right edge of the CIS unit.
  • Page 51 (2) Remove the two screws from the scanner frame ASSY. (See the illustration on the next page.) IV - 14...
  • Page 52 (3) Lift up the rear edge of the scanner frame ASSY to release the three pawls provided on the front end from the top cover, then hold up the ASSY and disconnect the scanner motor harness and CIS harness (if the CIS is mounted). (4) Take off the grounding terminals by removing the screws.
  • Page 53 (5) Turn the scanner frame ASSY upside down. (6) Remove the screw from the scanner motor and turn the motor clockwise to release from the latch. (7) Remove the pinch roller leaf spring by removing the screw, then lift up the pinch rollers and shaft.
  • Page 54 (9) Remove the pressure roller leaf springs by pulling them in the direction of arrows • and ‚ in this order as shown below. Then remove the pressure rollers and shaft. (10) Slightly push down the arm (in the direction of arrow •) and shift the separation roller gear to the right (arrow ‚) when viewed from the rear.
  • Page 55 (11) Take off the scanner drive unit by removing the two screws. The separation roller gear also comes off. (12) Push down the CIS side spring to release it from the latch, then pull it out to the right (when viewed from the rear).
  • Page 56 Reassembling Notes • When reinstalling the scanner motor, fit it in the latch provided on the scanner frame with the connector facing up and then secure it with the screw. (See page IV-16.) • When setting the scanner frame ASSY back into place, - secure the grounding terminals to the scanner frame ASSY with the screws at an angle shown on page IV-15.

  • Page 57: Rear Cover

    Rear Cover (1) Remove the four screws from the rear cover. (2) Slightly pull the top of the rear cover to the rear and lift up the rear cover. IV - 20...

  • Page 58: Auto Sheet Feeder (Asf

    Auto Sheet Feeder (ASF) (1) Remove two screws "a" that secure the ASF to the frame chassis. (2) Remove screw "b" that secures the ASF to the paper feed motor bracket. (3) At the left end of the ASF (when viewed from the rear), press the latch inwards to unhook it from the square hole provided in the frame chassis, then lift up the ASF.

  • Page 59: Inner Cover

    Inner Cover (1) Remove the three screws from the inner cover. (2) Remove the inner cover. To release the bottom end of the inner cover from the guide provided on the upper cover, lightly pull the top of the inner cover to the rear until it comes out of the upper cover and then pull it up.

  • Page 60: Battery Assy

    1.10 Battery ASSY Disconnecting the battery harness with the power cord unplugged will lose the settings (e.g., calendar clock, voice messages, and received FAX data) stored in the RAM. After connecting the battery harness, therefore, you may need to make those settings. To remove the upper cover ASSY, you need to disconnect the battery harness from the main PCB.

  • Page 61: Upper Cover Assy

    1.11 Upper Cover ASSY (1) Disconnect the following six harnesses (seven harnesses if the battery ASSY has not been removed) from the main PCB: • Cover sensor harness • Panel-main harness • CIS harness • Speaker harness • Hook switch harness •...
  • Page 62 (4) Open the top cover. (5) Remove two screws "c." (6) Lift the upper cover ASSY up and off the lower cover. Reassembling Notes • Route the harnesses as shown in Section 1.34. IV - 25...

  • Page 63: Top Cover Assy

    1.12 Top Cover ASSY (1) Remove two screws. (2) Remove the adhesive tape that secures the panel-main harness and CIS harness to the upper cover. (3) Take off the top cover in the direction of the arrow. (4) Place the top cover upside down. (5) Remove two screws from each of the hinges R and L, then take off those hinges.
  • Page 64 Reassembling Notes • When securing the hinge R, route the two grounding wires as illustrated above, taking care not to pinch them between the hinge and top cover. • As illustrated above, route the scanner motor harness and secure it to the support with a binder so that the distance from the ferrite core to the secured point comes to 50 ±5 mm.
  • Page 65 • When securing the hinge L, route the panel-main harness and CIS harness as illustrated on the previous page, taking care not to pinch them between the hinge and top cover. • When securing the hinge R, route the two grounding wires as illustrated on the previous page. •...

  • Page 66: Handset Mount And Hook Switch Pcb Assy

    1.13 Handset Mount and Hook Switch PCB ASSY (1) Open the top cover. (2) Remove the two screws from the handset mount. (3) Twist the handset mount so that it tilts over to the left and its upper end works out of the bosses provided on the upper cover.
  • Page 67 (4) Disassemble the handset mount by unhooking two latches "a" of the upper handset mount with a flat screwdriver. (5) Remove the hook switch PCB ASSY by unhooking latch "b." (6) Disconnect the hook switch harness from the hook switch PCB. Reassembling Notes •...

  • Page 68: Top Cover Lock Spring

    1.14 Top Cover Lock Spring (1) Remove the screw and take out the top cover lock spring. 1.15 Speaker and Cover Sensor PCB (1) Turn the upper cover upside down. (2) Take out speaker harness from the three guides and pull up the speaker. (3) Remove the screw and lift up the speaker spring.

  • Page 69: Main Pcb And Insulation Film

    1.16 Main PCB and Insulation Film (1) Disconnect the centro harnesses (1 and 2) and power supply harnesses (1 and 2) from the main PCB. (2) Disconnect the following harnesses and flat cables from the main PCB: • Carrier flat cables •...
  • Page 70 (3) Remove the four screws from the main PCB, then take off the main PCB while tilting the sensor lever (registration sensor actuator) to the rear. (4) Remove the insulation film from tabs provided on the frame chassis in the direction of arrows •...
  • Page 71 Setting up the main PCB after replacement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Important - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - NOTE: When replacing the main PCB, it is recommended that you replace all ink cartridges in order to maintain accurate ink level information.

  • Page 72: Video Pcb

    1.17 Video PCB (1) Disconnect the video capture harness from the video PCB. (2) Remove the screw and take out the video PCB. (3) Take out the video capture harness from the three guides. Disconnect it from the main PCB, if connected, then pull it out to the rear.

  • Page 73: Ink Empty Sensor Pcb Assy

    1.18 Ink Empty Sensor PCB ASSY (1) Peel off adhesive tape that attaches the ink empty sensor harness to the frame chassis at each of the rear and right side. (2) Take out the ink empty sensor harness from the guide slot and the latches. (3) Unhook the ink empty sensor PCB ASSY from the base frame in the direction of arrows •, ‚, and ƒ.
  • Page 74 (4) Disassemble the ink empty sensor PCB ASSY according to the steps below: - Pull up the latch of the sensor cover (in the direction of arrow •) and slide the sensor cover in the direction of arrow ‚ to separate the sensor cover from the sensor holder. - Remove the ink empty sensor PCB.

  • Page 75: Bottom Plate

    1.19 Bottom Plate (1) Remove two "x" screws and six "y" screws. (2) Lightly lift up the rear edge of the bottom plate and disconnect the centro harnesses (1 and 2) and power supply harnesses (1 and 2). (3) If the upper cover ASSY has not been removed so that the grounding wire has not been released from the frame chassis, you need to release the grounding wire from the bottom plate by removing screw "z"...

  • Page 76: Power Supply Pcb And Interface Pcb

    1.20 Power Supply PCB and Interface PCB (1) Place the bottom plate rightside up. (2) Remove two screws "d" from the power supply PCB. (3) Remove screw "e." (4) Disconnect the power supply PCB from the interface PCB. (5) Remove two screws "f" and take off the interface PCB. Reassembling Notes •...

  • Page 77: Ncu Pcb

    1.21 NCU PCB (1) Remove the screw from the NCU PCB. (2) Lightly lift up the NCU PCB and disconnect the NCU harness. IV - 40...

  • Page 78: Frame Chassis Assy

    1.22 Frame Chassis ASSY (1) If the bottom plate has not been removed, remove two screws "x" (shown in the illustration in Section 1.19) from the bottom plate. (2) Place the machine rightside up. (3) Cut off the binder that secures harnesses to the frame chassis. (4) Remove two "a"...

  • Page 79: Paper Feed Motor

    1.23 Paper Feed Motor (1) On the front side of the frame chassis, loosen screw "g" in order to allow a screwdriver to access screw "h." (2) Remove two screws "h" and take out the paper feed motor. Reassembling Notes •...

  • Page 80: Carrier Transport Motor, Main Shaft, Timing Belt, And Carrier Assy

    1.24 Carrier Transport Motor, Main Shaft, Timing Belt, and Carrier ASSY (1) Move the carrier to the center of its travel (in the direction of arrow •). (2) Remove the spring cuff. (3) While pressing the idle pulley holder to the right (in the direction of arrow ‚), remove the timing belt from the carrier transport motor pulley (arrow ƒ).
  • Page 81 (5) At the right end of the frame chassis, remove the main shaft holder and main shaft holder B. (See the illustration given on the next page.) (6) At the left end, remove the main shaft holder. (7) While supporting the left end of the main shaft, take up the right end and pull out the shaft to the right.
  • Page 82 (9) Unhook the cable stopper from the frame chassis. Then the carrier ASSY is released from the frame chassis. (The cable stopper is a part of the carrier ASSY.) (10) Remove the timing belt from the carrier. IV - 45...
  • Page 83 Reassembling Notes • If you replace the carrier transport motor with a new one, attach a ferrite core to the harness of the new motor so that the ferrite core comes to 30 ±10 mm away from the harness end at the connector housing side.

  • Page 84: Idle Pulley Holder

    1.25 Idle Pulley Holder (1) Move the carrier to the center of its travel. (2) Remove the spring cuff if not removed yet. (3) If the timing belt is installed, remove the timing belt from the carrier transport motor gear and the idle pulley while pressing the idle pulley holder to the right.

  • Page 85: Maintenance Assy

    1.26 Maintenance ASSY (1) On the rear side of the frame chassis, unhook the two latches of the maintenance ASSY. NOTE: The maintenance ASSY is glued to the frame chassis at four points, so you need to remove the glue. Reassembling Notes •...

  • Page 86: Pinch Roller Assys

    1.27 Pinch Roller ASSYs (1) Unhook the four feed springs from the rear of the frame chassis. (2) Pull out the four pinch roller ASSYs and springs to the rear. Reassembling Notes • If you have removed the sensor lever (registration sensor actuator), the two feed springs on the two center pinch roller ASSYs should be hooked after setting the sensor lever (registration sensor actuator).

  • Page 87: Sensor Lever (Registration Sensor Actuator

    1.28 Sensor Lever (Registration sensor actuator) (1) Unhook the sensor lever (registration sensor actuator) in the direction of arrow • and remove it in the direction of arrows ‚ and ƒ. (2) Remove the sensor lever spring. Reassembling Notes • After setting the four pinch roller ASSYs but before hooking the two feed springs on the two center pinch roller ASSYs, attach the sensor lever to the frame chassis.

  • Page 88: Earth Spring

    1.29 Earth Spring (1) Unhook the looped end of the earth spring from the base frame ("a") and remove the spring from the frame chassis ("b"). Reassembling Notes • Hook the bent end of the earth spring on the feed roller shaft, set its coil to "b," and then fit its looped end in "a,"...

  • Page 89: Exit Roller And Base Frame

    1.30 Exit Roller and Base Frame (1) From each of the right and left ends of the exit roller shaft, remove the E-ring. (2) At the left end of the exit roller, pull the arm of the bearing outwards and turn it clockwise (when viewed from the left), then pull it out to the left.
  • Page 90 (4) Remove the two screws from the bottom of the base frame. (5) Push up the rear end of the base frame to unhook it and then pull out the base frame to the front. IV - 53...

  • Page 91: Large Feed Roller Assy

    1.31 Large Feed Roller ASSY (1) At each of the right and left ends of the large feed roller shaft, pull the arm of the bearing outwards, turn it clockwise (when viewed from the left), and pull it out. NOTE: These bearings may be glued to the frame chassis and gear plate, so you need to remove the glue.

  • Page 92: Gear Plate Assy

    1.32 Gear Plate ASSY (1) Remove the two screws. (2) Slightly pull the gear plate ASSY to the right to unhook it from the tab of the frame chassis, and then remove it to the rear. IV - 55...

  • Page 93: Ink Foam

    1.33 Ink Foam (1) Take up the ink foam from the lower cover. IV - 56...

  • Page 94: Harness Routing

    1.34 Harness Routing IV - 57...

  • Page 95: Lubrication

    LUBRICATION Apply the specified lubricants to the lubrication points as shown below. Lubricant amount Lubricant type (Manufacturer Thin coat of grease Half of a rice-sized Rice-sized pinch Bean-sized pinch (1 mm pinch of grease of grease (6 mm of grease (12 mm (3 mm Molykote EM-30LG –––––––...

  • Page 96: 2 ] Control Panel Locks

    [ 2 ] Control panel locks [ 3 ] Scanner frame ASSY and separation roller gear IV - 59...

  • Page 97: 4 ] Top Cover Lock Spring

    [ 4 ] Top cover lock spring [ 5 ] Gear plate ASSY IV - 60...

  • Page 98: 6 ] Hinges

    [ 6 ] Hinges [ 7 ] Frame chassis ASSY IV - 61...

  • Page 99: 8 ] Idle Pulley Holder

    [ 8 ] Idle pulley holder [ 9 ] Maintenance ASSY IV - 62...

  • Page 100: Exit Roller Assy

    [ 10 ] Exit roller ASSY [ 11 ] Large feed roller ASSY IV - 63...
  • Page 101 CHAPTER V. MAINTENANCE MODE...
  • Page 102 CONTENTS ENTRY INTO THE MAINTENANCE MODE ............V-1 LIST OF MAINTENANCE-MODE FUNCTIONS ............V-2 DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS ....V-4 EEPROM Parameter Initialization ..............V-4 Printout of Scanning Compensation Data ............V-5 Firmware Switch Setting................. V-7 Operational Check of Control Panel PCB............V-18 Sensor Operational Check ................

  • Page 103: Entry Into The Maintenance Mode

    ENTRY INTO THE MAINTENANCE MODE To make the facsimile equipment enter the maintenance mode, press the Function, *, 2, 8, 6, and 4 keys in this order. Within 2 seconds The equipment beeps for approx. one second and displays " "...

  • Page 104: List Of Maintenance-Mode Functions

    2. LIST OF MAINTENANCE-MODE FUNCTIONS Maintenance-mode Functions Function Reference Code Function Subsection (Page) EEPROM Parameter Initialization 3.1 (V-4) Printout of Scanning Compensation Data 3.2 (V-5) Firmware Switch Setting 3.3 (V-7) Operational Check of Control Panel PCB 3.4 (V-18) (Check of Keys and Buttons) Sensor Operational Check 3.5 (V-19) EEPROM Customizing...
  • Page 105 - - - - - - - - - - - - - - - - - - - - - - - - - - IMPORTANT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Basically, the maintenance-mode functions listed on the previous page should be accessed by service personnel only.

  • Page 106: Detailed Description Of Maintenance-Mode Functions

    3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS EEPROM Parameter Initialization Function The equipment initializes the parameters, user switches, and firmware switches registered in the EEPROM, to the initial values. Entering the function code 01 initializes almost all of the EEPROM areas, but entering 91 does not initialize some areas, as listed below. Function code Data item Maintenance-mode functions...

  • Page 107: Printout Of Scanning Compensation Data

    Printout of Scanning Compensation Data Function The equipment prints out the white and black level data for scanning compensation. Operating Procedure Do not start this function merely after powering on the equipment but start it after carrying out a sequence of scanning operation. Unless the equipment has carried out any scanning operation, this function cannot print out correct scanning compensation data.
  • Page 108 Scanning Compensation Data List V - 6...

  • Page 109: Firmware Switch Setting

    Firmware Switch Setting Function The facsimile equipment incorporates the following firmware switch functions (WSW01 through WSW36) which may be activated with the procedures using the control panel keys and buttons. The firmware switches have been set at the factory in conformity to the communications standards and codes of each country.
  • Page 110 Operating Procedure (1) Press the 1 and 0 keys in this order in the initial stage of the maintenance mode. The equipment displays the "WSW00" on the LCD and becomes ready to accept a firmware switch number. (2) Enter the desired number from the firmware switch numbers (01 through 36). The following appears on the LCD: WSWXX = 0 0 0 0 0 0 0 0 (3) Use the...
  • Page 111 Detailed Description for the Firmware Switches WSW05 (1st dial tone and busy tone detection Selector Function Setting and Specifications Not used. No. 5 6 0 0 : No detection Busy tone detection in auto- 0 1 : Detection only after dialing matic sending mode 1 0 : No detection...
  • Page 112 WSW12 (Signal detection condition setting) Selector Function Setting and Specifications No. 1 300 ms (in the U.S.A. and Min. OFF time length of calling Canadian versions) signal (Ci) 500 ms 700 ms 900 ms No. 3 6 sec. Max. OFF time length of calling 7 sec.
  • Page 113 WSW13 (Modem setting) Selector Function Setting and Specifications No. 1 0 km Cable equalizer 0 km 7.2 km 7.2 km No. 3 -43 dBm Reception level -47 dBm -49 dBm -51 dBm 0: 0 dB 1: 8 dB 0: 0 dB 1: 4 dB Modem attenuator 0: 0 dB...
  • Page 114 WSW14 (AUTO ANS facility setting) Selector Function Setting and Specifications 13 Hz Frequency band selection 15 Hz (Lower limit) 23 Hz 20 Hz Frequency band selection 30 Hz (Upper limit) 55 Hz 70 Hz Not used. Selectors 1 through 4: Frequency band selection These selectors are used to select the frequency band of calling signals for activating the AUTO ANS facility.
  • Page 115 WSW20 (Overseas communications mode setting) Selector Function Setting and Specifications Not used. Overseas communications mode 0: 2100 Hz 1: 1100 Hz (Reception) Overseas communications mode 0: OFF 1: Ignores DIS once. (Transmission) Not used. Selectors 2 and 3: Overseas communications mode These selectors should be used if the facsimile equipment malfunctions in overseas communications.
  • Page 116 WSW21 (TAD setting) Selector Function Setting and Specifications No. 1 : No detection : 1 sec. : 2 sec. Max. waiting time for voice signal : 3 sec. : 8 sec. : 31 sec. Not used. NOTE: Selectors 1 through 8 are applicable to those models equipped with a built-in TAD. Selectors 1 through 5: Max.
  • Page 117 WSW23 (Communications setting) Selector Function Setting and Specifications Starting point of training check 0: From the head of a series of zeros (TCF) 1: From any arbitrary point Not used. Selector 1: Starting point of training check (TCF) At the training phase of receiving operation, the called station detects for 1.0 second a training check (TCF) command, a series of zeros which is sent from the calling station for 1.5 seconds to verify training and give the first indication of the acceptability of the line.
  • Page 118 WSW30 (Function setting 2) Selector Function Setting and Specifications 1 2 3 0 0 0 -38.0 dBm 0 0 1 -39.5 dBm Detection level of dial tone or 0 1 0 -41.0 dBm busy tone for the built-in TAD 0 1 1 -42.5 dBm operation 1 0 0...
  • Page 119 WSW35 (Function setting 3) Selector Function Setting and Specifications No. 1 2 3 4 0 0 0 : No detection Detection time length of the 0 0 1 : 1 sec. disconnection tone in ICM recording 0 1 0 : 2 sec.

  • Page 120: Operational Check Of Control Panel Pcb

    Operational Check of Control Panel PCB Function This function allows you to check the control panel PCB for normal operation. Operating Procedure (1) Press the 1 and 3 keys in this order in the initial stage of the maintenance mode. The "00 "...

  • Page 121: Sensor Operational Check

    Sensor Operational Check Function This function allows you to check that the following 13 sensors operate correctly. Document front sensor Document rear sensor Cover sensor Registration sensor Hook switch Carrier home position sensor Ink empty sensor Operating Procedure (1) Press the 3 and 2 keys in this order in the initial stage of the maintenance mode. The equipment sounds 1100 Hz and 400 Hz tones cyclically through the following volumes for testing the speaker: If the sensors are ON as listed below, the LCD will show "FRRECVHKENCREP"...

  • Page 122: Eeprom Customizing

    EEPROM Customizing Function This function allows you to customize the EEPROM according to language, function settings, and firmware switch settings. The customizing codes list is given in Appendix 1. NOTE: If you replace the main PCB, be sure to carry out this procedure. Operating Procedure (1) Press the 7 and 4 keys in this order in the initial stage of the maintenance mode.
  • Page 123 CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING...
  • Page 124 CONTENTS ERROR INDICATION....................VI-1 TROUBLESHOOTING ....................VI-3 2.1 Introduction ......................VI-3 2.2 Precautions ......................VI-3 2.3 Checking prior to Troubleshooting ..............VI-3 2.4 Troubleshooting Procedures................VI-5 [ 1 ] Control panel related ................ VI-5 [ 2 ] Telephone related................VI-5 [ 3 ] Communications related..............

  • Page 125: Error Indication

    1. ERROR INDICATION To help the user or the service personnel promptly locate the cause of a problem (if any), the facsimile equipment incorporates the self-diagnostic functions which display error messages for equipment errors. If an equipment error occurs, the facsimile equipment emits an audible alarm (continuous beeping) for approximately 4 seconds and shows the error message on the LCD.
  • Page 126 Messages on the LCD Probable Cause CLEAN UP SCANNER In the scanning compensation data list printed by the maintenance-mode function code 05 (refer to Chap. V, Section 3.2), less than fifty percent of the white level data is faulty. (This message may appear only in the maintenance mode) SCANNER ERROR In the scanning compensation data list printed by the maintenance-mode function code 05 (refer to Chap.

  • Page 127: Troubleshooting

    2. TROUBLESHOOTING Introduction This section gives the service personnel some of the troubleshooting procedures to be followed if an error or malfunction occurs with the facsimile equipment. It is impossible to anticipate all of the possible problems which may occur in future and determine the troubleshooting procedures, so this section covers some sample problems.
  • Page 128 Recording paper Check that: (1) A recommended type of recording paper is used. (2) The recording paper is not dampened. Ink cartridges (1) Check that both of two ink cartridges are loaded. VI - 4...

  • Page 129: Troubleshooting Procedures

    Troubleshooting Procedures [ 1 ] Control panel related Trouble Check: (1) LCD shows nothing. • Panel-main harness • Control panel PCB • Power supply PCB • Main PCB • Interface PCB • Power supply harnesses (1 and 2), connecting the interface PCB and main PCB with each other (2) Control panel inoperative.

  • Page 130: 3 ] Communications Related

    [ 3 ] Communications related Trouble Check: (1) No tone is transmitted. • Main PCB • NCU PCB • NCU harness [ 4 ] Paper/document feeding related Trouble Check: (1) Neither "COPY: PRESS • Sensors by using the maintenance-mode function code 32. COPY"...

  • Page 131: 5 ] Print-Image Related

    [ 5 ] Print-image related If the received or sent image has any problem, first make a copy with the facsimile equipment. If the copied image is normal, the problem may be due to the remote terminal; if it is abnormal, proceed to the following checks: Trouble Action to be taken...
  • Page 132 Trouble Action to be taken (4) Light At the scanner Check the following components: - CIS unit - Main PCB At the printer Check the following components: - Ink cartridges - Main PCB - Power supply PCB - Interface PCB (5) Dark At the scanner Check the following components:...
  • Page 133 Trouble Action to be taken (7) Print edges not aligned At the printer • Check the alignment of vertical print lines by using the Ink management function. • Check the ink cartridges. (8) Ink splash At the printer • For each of the two ink-jet print heads, perform the head nozzle cleaning operation several times to remove dust or air bubbles from its nozzles.

  • Page 134: 6 ] Pc-Driven Or Video Capture-Driven Printing

    Trouble Action to be taken (10) White horizontal streaks • For each of the two ink-jet print heads, perform the head nozzle cleaning operation several times to remove dust or air bubbles from its nozzles. • Replace the ink cartridge(s). •...
  • Page 135 May ’99 … SM8XD115 Printed in Japan...
  • Page 136 MFC7050C Appendix 1. EEPROM Customizing Codes...
  • Page 137 If you press the Stop key or no keys are pressed for one minute in the above procedure, the equipment stops the procedure and returns to the initial stage of the maintenance mode. n EEPROM Customizing Codes List Model Versions MFC7050C U.S.A. 1001 CANADA 0002...
  • Page 138 MFC7050C Appendix 2. Circuit Diagrams A. Main PCB B. Network Control Unit (NCU) PCB C. Control Panel PCB D. Interface PCB E. Power Supply PCB...
  • Page 139 + 3 . 3 V + 3 . 3 V + 3 . 3 V + 3 . 3 V + 3 . 3 V D 1 3 C 4 0 R 1 1 3 # 1 7 R 1 1 2 C C 1 0 4 2 2 K A M F P C...
  • Page 140 + 5 B S 0 V C 1 4 9 + 5 V + 5 V + 5 V S 0 V S 0 V S 0 V S 0 V C C 1 0 4 C 1 5 0 C 1 7 4 C 1 9 7 C C 1 0 4...
  • Page 141 + 3 . 3 V + 3 . 3 V + 5 V M 5 V + 3 . 3 V R 2 5 8 1 1 0 K C 2 0 4 C C 1 0 4 S 0 V C 2 0 2 C C 1 0 4 S 0 V...
  • Page 142 N C U 1 + 5 V + 3 0 V Q 2 5 M 5 V + 3 0 V D T C 1 1 4 Y K A C 2 5 7 C C 1 0 2 + 3 . 3 V C 2 2 7 C 2 4 4 S O V...
  • Page 143 P 1 8 + 5 V P S 1 C 1 4 1 0 V / 1 0 0 S 0 V S 0 V + 3 . 3 V + 2 2 V C N T C 1 3 5 5 C 1 0 V / 1 0 0 B 7 B - P H...
  • Page 144 R A 1 5 R A 1 1 R A 1 3 3 . 3 K 3 . 3 K + 5 V + 3 . 3 V + 3 . 3 B P 1 5 + 3 . 3 V C E N A A C K R 1 9 3...
  • Page 145 + 3 0 V + 3 . 3 V P 1 7 C I S R 1 8 2 H O O K 2 . 2 K + 5 V L 1 3 H O O K # 1 3 Q 1 8 3 3 C 7 4 H C T 7 0 0 7 A F...
  • Page 146 + 1 1 . 7 5 V + 2 2 V + 5 V C 4 4 C C 1 0 4 C 5 2 C 4 1 C 2 6 4 V C C 1 C C 1 0 4 V C C 2 A C C 1 0 4 C C 1 0 4...
  • Page 147 B B A S 8 6 C + 1 1 . 7 5 V + 5 V + 3 0 V R 5 3 + 5 V H O M E 8 3 B R 5 1 R 3 7 H S B I A S P 1 9 S B 1 0 - O 5 P C P...
  • Page 148 C 2 2 1 R 2 3 7 L C 8 2 5 0 9 R 2 8 3 ( 2 1 2 5 ) 2 K ( F ) R 2 3 4 L 1 0 2 0 0 V I D E O C C 4 7 4 R 2 2 7...
  • Page 149 3 . C O M P O N E N T S P A R E N T H E S I S N O T M O U N T E D . + 2 6 V C M L C R 1 M Z F - 2 4 H G R A 3 5 1 x 2...
  • Page 150 + 5 V S G N D + 5 V C C 1 0 2 X 7 V S S V D D S G N D + 5 D L P D 6 5 6 1 2 G B S G N D R 1 4 R 1 3...
  • Page 151 B 1 0 B - P H A A C K A C K A B U S Y B U S Y A P E A S L C T S L C T A A F A S I N S E L I N A F L T F L T...
  • Page 152 3 0 V : J W 4 + 2 2 C N T : J W 1 , J W 5 , J W 6 , J W 1 0 3 0 R E T : J W 2 , J W 3 N .
  • Page 153 Power Supply PCB...

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