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Brother 8250P - FAX B/W Laser Printer Service Manual
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Brother 8250P - FAX B/W Laser Printer Service Manual

Brother 8250P - FAX B/W Laser Printer Service Manual

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FACSIMILE EQUIPMENT
SERVICE MANUAL
MODEL: FAX2750/FAX-8050P/FAX-8250P
MFC4350/MFC4650/MFC6650MC/
MFC-9050/MFC-9550

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Summary of Contents for Brother 8250P - FAX B/W Laser Printer

  • Page 1 FACSIMILE EQUIPMENT SERVICE MANUAL MODEL: FAX2750/FAX-8050P/FAX-8250P MFC4350/MFC4650/MFC6650MC/ MFC-9050/MFC-9550...
  • Page 2 © Copyright Brother 1998 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: Safety Information

    SAFETY INFORMATION Laser Safety (110-120V Model only) This printer is certified as a Class 1 laser product under the US Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. This means that the printer does not produce hazardous laser radiation. Since radiation emitted inside the printer is completely confined within the protective housings and external covers, the laser beam cannot escape from the machine during any phase of user operation.
  • Page 5 CHAPTER I. GENERAL DESCRIPTION...
  • Page 6 CONTENTS EQUIPMENT OUTLINE ..................I-1 1.1 External Appearance and Weight..............I-1 1.2 Components ....................I-1 SPECIFICATIONS ....................I-2...

  • Page 7: Equipment Outline

    EQUIPMENT OUTLINE External Appearance and Weight The figure below shows the equipment appearance and approximate dimensions. Weight: Machine proper Approx. 7.2 kg Machine (incl. drum unit & toner cartridge) Approx. 8.5 kg In package Approx. 12 kg Components The equipment consists of the following major components: I - 1...
  • Page 8 I - 2...

  • Page 9: Specifications

    SPECIFICATIONS (1/2) Model FAX2750 MFC4350 Color White (1397) White (1138) PRINTER Available with option * Engine/Type [YL (VA)] YL (VA) [6 ppm] 6 ppm dpi (output resolution) [600 x 600] 600 x 600 Paper Capacity [200] Emulation (Standard) PCL4 Standards [Windows GDI (600 x 600)] Windows GDI (600 x 600) Memory (Typical)
  • Page 10 (1/2) Model MFC4650 MFC6650MC Color White (1138) White (1138) PRINTER Engine/Type YL (VA) YL (VA) 6 ppm 6 ppm dpi (output resolution) 600 x 600 600 x 600 Paper Capacity Emulation (Standard) PCL4 PCL4 Standards Windows GDI (600 x 600) Windows GDI (600 x 600) Memory (Typical) 1 MB...
  • Page 11 (1/2) Model FAX-8050P FAX-8250P Color White (1397) White (1397) PRINTER Available * Available with option * Engine/Type [YL (VA)] [YL (VA)] [6 ppm] [6 ppm] dpi (output resolution) [600 x 600] [600 x 600] Paper Capacity [200] [200] Emulation (Standard) Standards [Windows GDI (600 x 600)] [Windows GDI (600 x 600)]...
  • Page 12 (1/2) Model MFC-9050 MFC-9550 Color White (1138) White (1138) PRINTER Engine/Type YL (VA) YL (VA) 6 ppm 6 ppm dpi (output resolution) 600 x 600 600 x 600 Paper Capacity Emulation (Standard) PCL4 Standards Windows GDI (600 x 600) Windows GDI (600 x 600) Memory (Typical) 1 MB 1 MB...
  • Page 13 (2/2) Model FAX2750 MFC4350 One-touch Dial 12 x 2 12 x 2 Speed Dial Tel-Index Chain Dialing Contrast SL/Auto/SD SL/Auto/SD FAX/TEL Switch Distinctive Ringing Caller ID Yes (Call Waiting) Yes (Call Waiting) TAD Interface Next FAX Reservation Yes, Dual Access Yes, Dual Access Dual Access Help...
  • Page 14 (2/2) Model MFC4650 MFC6650MC One-touch Dial 12 x 2 12 x 2 Speed Dial Tel-Index Chain Dialing Contrast SL/Auto/SD SL/Auto/SD FAX/TEL Switch Distinctive Ringing Caller ID Yes (Call Waiting) Yes (Call Waiting) TAD Interface Next FAX Reservation Yes, Dual Access Yes, Dual Access Dual Access Help...
  • Page 15 (2/2) Model FAX-8050P FAX-8250P One-touch Dial 12 x 2 12 x 2 Speed Dial Tel-Index Chain Dialing Contrast SL/Auto/SD SL/Auto/SD FAX/TEL Switch Distinctive Ringing Yes (Denmark version only) Caller ID Yes (U.K. French/Norway/Sweden versions only) TAD Interface Next FAX Reservation Yes, Dual Access Yes, Dual Access Dual Access...
  • Page 16 (2/2) Model MFC-9050 MFC-9550 One-touch Dial 12 x 2 12 x 2 Speed Dial Tel-Index Chain Dialing Contrast SL/Auto/SD SL/Auto/SD FAX/TEL Switch Distinctive Ringing Yes (Denmark version only) Caller ID Yes (U.K. French/Norway/Sweden versions only) Yes (U.K. French/Norway/Sweden versions only) TAD Interface Next FAX Reservation Yes, Dual Access...
  • Page 17 CHAPTER II. INSTALLATION...
  • Page 18 CONTENTS INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT....II-1...
  • Page 19 INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT If the program version is updated or the main PCB is replaced, install the update program onto the flash ROM of the main PCB. The program installation requires a host computer satisfying the following requirements: - CPU Pentium 75 or higher - RAM...
  • Page 20 Installing the update data onto the flash ROM of the facsimile equipment Load the floppy disk which stores the update data and transfer utility into the floppy disk drive of your computer. (Or, copy the update data and transfer utility onto the same directory of the hard disk.) Click the Start button, point to Programs, and then click MS-DOS Prompt to open an MS- DOS window.
  • Page 21 CHAPTER III. THEORY OF OPERATION...

  • Page 22: Table Of Contents

    CONTENTS OVERVIEW......................III-1 MECHANISMS...................... III-2 2.1 Scanner Mechanism ..................2.1.1 Document feeding and ejecting mechanism .......... 2.1.2 Scanner ....................2.2 Laser Printing Mechanism................2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism..... 2.2.2 Print process mechanism ..............(1) Charging process................(2) Exposing process ................. (3) Developing process ..............

  • Page 23: Overview

    OVERVIEW *Not provided on the FAX-8250P/MFC-9050. III - 1...

  • Page 24: Mechanisms

    MECHANISMS The facsimile equipment is classified into the following mechanisms: n SCANNER MECHANISM - Document feeding and ejecting mechanism - Document scanning mechanism n LASER PRINTING MECHANISM - Paper pulling-in, registration, feeding, and ejecting mechanisms - Print process mechanism (consisting of charging, exposing, developing, transferring, and erasing processes) - Heat-fixing mechanism...

  • Page 25: Scanner Mechanism

    Scanner Mechanism 2.1.1 Document feeding and ejecting mechanism This mechanism consists of the document stacker, automatic document feeder (ADF), document ejection roller ASSY, and document sensors. (For details about the sensors, refer to Section 2.3.) If the operator sets documents on the document stacker and starts the scanning operation, the scanner motor rotates so that the ADF (which consists of the separation roller and ADF parts) feeds those documents into the equipment, starting from the bottom sheet to the top, page by page.

  • Page 26: Laser Printing Mechanism

    Laser Printing Mechanism 2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism III - 4...
  • Page 27 Paper pulling-in and registration mechanism The paper pulling-in and registration mechanism consists of the pull-in roller gear (incorporated in the multi-purpose sheet feeder), planetary gear system, paper feed solenoid, solenoid lever, clutch release lever, and registration sensor. (For the details about the sensor, refer to Section 2.3.) If the main motor rotates clockwise, the rotation is transmitted to the intermediate gear of the planetary gear system.

  • Page 28: Print Process Mechanism

    2.2.2 Print process mechanism The print process unit works with laser beam, electrical charges, and toner. The graph below shows the transition of electrical charge on the surface of the laser-sensitive drum through the five processes: charging, exposing, developing, transferring, and erasing processes. III - 6...

  • Page 29: Charging Process

    (1) Charging process The high-voltage power supply applies DC bias to the corona wire to generate ion on the grid. The ion uniformly charges the surface of the laser-sensitive drum to approx. 1000V which is kept by the varister grounding the grid to the frame. (2) Exposing process When the laser-sensitive drum holds a positive electrical charge, the laser beam issued from the laser unit scans the drum according to the print image to expose the drum surface for neutralizing...

  • Page 30: Developing Process

    (3) Developing process The developing process develops an electrostatic latent image formed on the drum in the exposing process, into a toner image. The developer roller attracts the toner particles fed from the toner cartridge by the toner supply roller, and then conveys them to the contact section with the laser-sensitive drum On the contact section between the developer roller and drum, the positive toner particles stick to the neutralized spots on the drum according to the principles of attraction and repulsion, transforming a latent image into a toner image.

  • Page 31: Heat-Fixing Mechanism

    2.2.3 Heat-fixing mechanism As the paper passes between the heater roller and the pressure roller in the heat-fixing unit, the heater roller fuses the toner on the paper. III - 9...

  • Page 32: Sensors And Actuators

    Sensors and Actuators This equipment has ten sensors: seven photosensors, two thermisters and a mechanical switch as described below. Sensor name Type Located on Document front sensor Photosensor Control panel PCB ASSY (Document sensor PCB) Document rear sensor Photosensor Control panel PCB ASSY (Document sensor PCB) Top cover sensor Photosensor...
  • Page 33 *Not provided on the FAX-8250P/MFC-9050. Location of Sensors and Actuators III - 11...

  • Page 34: Control Electronics

    CONTROL ELECTRONICS Configuration The hardware configuration of the facsimile equipment is shown below. (NOTE 1) Provided on the FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC. (NOTE 2) Provided on the European, Australian, Indonesian, and Asian versions. Configuration of Facsimile Equipment III - 12...

  • Page 35: Main Pcb

    Main PCB The main PCB, which is the nucleus controlling the entire operation of the equipment, consists of a FAX engine (ASIC), memories, MODEM, motor drive circuitry, sensor detection circuitry, and analog circuits for scanning, printing, and power transmission shifting. EEPROM:Electrically Erasable Programmable Read-only Memory DRAM: Dynamic Random Access Memory...
  • Page 36 III - 14...

  • Page 37: Ncu Pcb

    NCU PCB The NCU PCB switches the communications line to telephone or built-in MODEM, under the control of the main PCB. U.S.A. versions III - 15...
  • Page 38 European versions III - 16...

  • Page 39: 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 FAX engine on the main PCB.

  • Page 40: Power Supply Pcb

    Power Supply PCB [ 1 ] Low-voltage power supply PCB The low-voltage power supply uses the switching regulation system to generate DC power (+5V and +24V) from a commercial AC power supply for the driver circuits. The +5V source is fed to the logic, control panel, sensors, CIS unit, etc.

  • Page 41: 2 ] High-Voltage Power Supply Pcb

    [ 2 ] High-voltage power supply PCB This power supply generates high-voltage power sources from the 24V source fed from the low- voltage power supply for charging, developing, and transferring in the laser printing process. High-voltage Power Supply Circuit III - 19...
  • Page 42 CHAPTER IV. DISASSEMBLY/REASSEMBLY AND LUBRICATION...
  • Page 43 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 ROM Cover, Option Cover, and Battery ASSY*..........IV-5 Multi-purpose Sheet Feeder ................IV-7 Document Guide Base..................
  • Page 44 LUBRICATION...................... IV-45 [ 1 ] Document feed roller ASSY and document ejection roller ASSY..... IV-45 [ 2 ] Control panel locks ................. IV-46 [ 3 ] Scanner frame ASSY and separation roller gear........IV-46 [ 4 ] Top cover lock spring................IV-47 [ 5 ] Gear drive unit..................

  • Page 45: Disassembly/Reassembly

    DISASSEMBLY/REASSEMBLY n 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) When servicing the optical system of the laser printing unit, be careful not to place screwdrivers or other reflective objects in the path of the laser beam.

  • Page 46: Tightening Torque List

    Tightening Torque List Location Screw type Q'ty Tightening torque Loosening torque (kg•cm) (kg•cm) Option cover Screw, pan (washer) M3x8DB 4 ±1 2 to 6 ADF parts Taptite, pan (washer) B M3x6 4 ±1 2 to 6 Panel rear cover Taptite, cup B M3x8 6 ±1 2 to 6 Scanner frame ASSY...

  • Page 47: 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 dust cover, - the paper wire extension...

  • Page 48: Disassembly Order Flow

    Disassembly Order Flow IV - 4...

  • Page 49: Rom Cover, Option Cover, And Battery Assy

    ROM Cover, Option Cover, and Battery ASSY* (*Provided on the FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC) (1) As shown below, push down section "a" of the ROM cover and tilt it to the rear. (2) Take off the option cover from the rear of the main cover by removing two screws "a." The grounding wire also comes free.
  • Page 50 (3) FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC: To replace the battery ASSY (Ni-MH battery), plug the power cord of the facsimile equipment into a power outlet, disconnect the battery harness from the main PCB, and take out the battery ASSY while pulling the battery support of the main cover in the direction of the arrow. Set a new battery ASSY, connect the battery harness to the main PCB, and then unplug the power cord.

  • Page 51: Multi-Purpose Sheet Feeder

    Multi-purpose Sheet Feeder (1) Open the top cover. (2) Remove one of two screws from each of right and left top cover stoppers, and then fully open the top cover. (3) Pull either one of the right and left tabs provided on the main cover outwards and slightly lift up the multi-purpose sheet feeder, then release the other end of the sheet feeder also.

  • Page 52: Document Guide Base

    Document Guide Base (1) Turn up the document guide base towards you. (2) Push the right or left end of the document guide base inwards and take it off. IV - 8...

  • Page 53: 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 54: 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, anti-static 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 55 (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 56 (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 57: 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 58: 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 59 (2) Open the top cover. (3) Disconnect the scanner motor harness from the scanner motor ASSY without removing the shield film. IV - 15...
  • Page 60 (4) Close the top cover. (5) Remove the two screws from the scanner frame ASSY. (6) 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 CIS harness (if the CIS is mounted).
  • Page 61 (8) Turn the scanner frame ASSY upside down. (9) Remove the screw from the scanner motor and turn the motor clockwise to release from the latch. (10) Take off the scanner grounding leaf spring by removing the screw. (11) Take off the CIS shield plate by removing the screw. (12) Remove the pinch roller leaf spring, pinch rollers and shaft.
  • Page 62 (14) 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. (15) 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 63 (16) Take off the scanner drive unit by removing the two screws. The separation roller gear also comes off. (17) 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 64 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-17.) • When setting the scanner frame ASSY back into place, - secure the grounding terminal to the scanner frame ASSY with the screw and route the grounding wire around boss "x"...

  • Page 65: Top Cover

    Top Cover (1) Open the top cover. (2) Remove one of two screws from each of right and left top cover stoppers, and then fully open the top cover. (3) Pull the panel-main harness and CIS harness towards you. (4) Remove the adhesive tape and pull the scanner motor harness and grounding wire towards you.
  • Page 66 (5) Remove the four screws from the hinges R and L. (6) Slightly lift up the top cover to release the bosses from the hinges and take it off to the rear. (7) Remove the harness support sponges and take out the harnesses from the top cover. IV - 22...
  • Page 67 (8) Remove the two screws from each of the hinges R and L. The top cover stoppers also come off. Reassembling Notes • When setting each hinge back into place, fit its tab in section "x" provided on the main cover. •...

  • Page 68: Handset Mount And Hook Switch Pcb (For Models Except The Fax-8250P/Mfc-9050) Side Cover (For The Fax-8250P/Mfc-9050

    Handset Mount and Hook Switch PCB (for models except the FAX-8250P/MFC-9050) Side Cover (for the FAX-8250P/MFC-9050) (1) Open the top cover. (2) Remove one of two screws from each of right and left top cover stoppers, then fully open the top cover.
  • Page 69 (5) Disassemble the handset mount by unhooking two latches "a" of the upper handset mount with a flat screwdriver. (6) Remove the hook switch PCB ASSY by unhooking latch "b." (7) Disconnect the hook switch harness from the hook switch PCB Reassembling Notes •...

  • Page 70: Heat-Fixing Unit, Fu Lamp, And Paper Ejection Sensor Actuator

    1.10 Heat-fixing Unit, FU Lamp, and Paper Ejection Sensor Actuator (1) Open the top cover. (2) Remove one of two screws from each of right and left top cover stoppers, then fully open the top cover. (3) Remove screw "a." (4) Lift the left end of the heat-fixing unit up and to the left to release the right-hand boss from the main cover, hold it up, and disconnect the heater harness (of the blue and brown heater wires).
  • Page 71 (6) To take out the FU lamp from the heat-fixing unit, remove two screws "b." (7) Unhook the two latches outwards with the tip of a small flat screwdriver and open the upper cover. (8) Fully open the upper cover and remove it. (9) Remove screw "d"...

  • Page 72: Laser Unit And Toner Sensor Pcb

    1.11 Laser Unit and Toner Sensor PCB (1) Remove the screw (Taptite, cup B M3x8) from the toner sensor PCB. (2) Slightly lift up the toner sensor PCB and disconnect its harness. (3) Remove the three screws from the laser unit. (4) Slightly lift up the laser unit and disconnect the following from the main PCB: - Laser diode harness (5-pin) - Toner sensor harness (4-pin) if the toner sensor PCB is installed...

  • Page 73: Bottom Plate

    1.12 Bottom Plate (1) Turn the facsimile equipment upside down. (2) Remove two screws "b" from the interface connector. (3) Remove seven screws "c" and three screws "d" from the bottom plate. (4) Slightly lift up the bottom plate, then take off the AC cord bushing and remove screw "e" from the grounding terminal.
  • Page 74 Reassembling Notes • When putting the bottom plate into place, secure the grounding wire to the bottom plate with screw "e," fit the AC cord bushing into the cutout of the bottom plate, and fit the holes over the bosses of the main cover. First tighten screws "b" (interface connector screws) and then tighten screws "c"...

  • Page 75: Low-Voltage Power Supply Pcb

    1.13 Low-voltage Power Supply PCB (1) Remove the screw from the low-voltage power supply PCB. (2) Slightly lift up the low-voltage power supply PCB and disconnect it from the main PCB. (3) Disconnect the heater harness (of the blue and brown wires) from the low-voltage power supply PCB.

  • Page 76: Main Pcb

    1.14 Main PCB (1) For the FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC, take the battery ASSY* out of the supports at the rear of the main cover. (2) Remove the screw from the main PCB. (3) Slightly lift up the main PCB and disconnect it from the low-voltage power supply PCB. (4) Disconnect the following harnesses from the main PCB: •...
  • Page 77 Provided on the FAX-8250P/MFC-9050 (French version only)/MFC6650MC/MFC-9550. Provided on the on the European, Australian, Indonesian, and Asian versions. Not provided on the FAX-8250P/MFC-9050. IV - 33...
  • Page 78 Setting up the main PCB after replacement IV - 34...

  • Page 79: High-Voltage Power Supply Pcb

    1.15 High-voltage Power Supply PCB (1) Remove the screw from the insulation film and high-voltage power supply PCB. (2) Remove the insulation film. (3) Slightly lift up the high-voltage power supply PCB and disconnect the main–high-voltage flat cable. (4) Disconnect the EL (eraser lamp) board harness and drum grounding harness from the high- voltage power supply PCB.

  • Page 80: Fan

    1.16 Fan (1) If the main PCB is installed, remove the screw from the main PCB (refer to Section 1.14). (2) Slightly lift up the main PCB and disconnect the fan harness from the main PCB. (3) Take out the fan support. (4) Pull up the fan.

  • Page 81: Registration Sensor Actuator, Sheet Feeder Cover Sensor Actuator, And Top Cover Sensor Actuator

    1.17 Registration Sensor Actuator, Sheet Feeder Cover Sensor Actuator, and Top Cover Sensor Actuator (1) Pull up the registration sensor actuator, sheet feeder cover sensor actuator, and top cover sensor actuator. 1.18 Speaker (1) Pull the speaker spring inwards and pull up the speaker. Reassembling Notes •...

  • Page 82: Gear Drive Unit

    1.19 Gear Drive Unit (1) Make sure that the heat-fixing unit is removed. (2) Remove the three screws from the gear drive unit. (3) Lift the gear drive unit up and out of the main cover. IV - 38...
  • Page 83 (4) To take off the motor cover and main motor, remove two screws "x." (5) To take off the paper feed solenoid, solenoid lever, or clutch release lever, remove three screws "y." "x" Taptite, cup S M3x8 Motor cover Main motor Motor bracket "y"...

  • Page 84: Ncu Pcb

    1.20 NCU PCB (1) Make sure that the MJ cover, low-voltage power supply PCB and gear drive unit are removed. (2) Remove the screw from the NCU bracket. (3) Slightly lift up the NCU bracket (which holds the NCU PCB) and then disconnect the NCU harness from the NCU PCB.
  • Page 85 (4) Remove the screw and take off the NCU PCB from the NCU bracket. (* Provided on the European, Australian, Indonesian, and Asian versions.) Reassembling Notes • When setting the NCU PCB to the NCU bracket, fit its edges onto "b" and "c" and into "a" and "d"...

  • Page 86: Scanner Grounding Plate

    1.21 Scanner Grounding Plate (1) Make sure that the heat-fixing unit is removed. (2) Remove the screw from the scanner grounding plate and take it off. (If the bottom plate has not been removed, remove front screw "c" also (see page IV-29) that secures both the scanner grounding plate and bottom plate.) (3) You may peel off the anti-static brush from the scanner grounding plate.

  • Page 87: El (Erase Lamp) Board

    1.22 EL (Eraser Lamp) Board Only when you need to replace the EL board (which is attached with double-sided adhesive tape), remove it according to the steps below. (1) Make sure that the EL board harness is disconnected from the high-voltage power supply PCB.

  • Page 88: Cleaning Of High-Voltage Contacts And Grounding Contacts

    1.23 Cleaning of High-voltage Contacts and Grounding Contacts If any toner particles, paper dust or dirt are on the contacts, clean them out. This will ensure that power flows correctly to enable printing. Grounding contacts High-voltage contacts IV - 44...

  • Page 89: 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 pinch of Rice-sized pinch (1 mm grease (3 mm of grease (6 mm Molykote EM-30LG or EM-30L (Dow Corning) Conductive grease...

  • Page 90: 2 ] Control Panel Locks

    [ 2 ] Control panel locks [ 3 ] Scanner frame ASSY and separation roller gear IV - 46...

  • Page 91: 4 ] Top Cover Lock Spring

    [ 4 ] Top cover lock spring [ 5 ] Gear drive unit IV - 47...
  • Page 92 CHAPTER V. MAINTENANCE MODE...
  • Page 93 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 ADF Performance Test................V-7 Test Pattern 1..................... V-8 Firmware Switch Setting and Printout ............V-9 Operational Check of LCD................

  • Page 94: Entry Into The Maintenance Mode

    ENTRY INTO THE MAINTENANCE MODE FAX2750/MFC4350/MFC4650/MFC6650MC: To make the equipment enter the maintenance mode, press the Function, *, 2, 8, 6, and 4 keys in this order. Within 2 seconds FAX-8250P/MFC-9050/MFC-9550: To make the equipment enter the maintenance mode, press the Menu, *, 2, 8, 6, and 4 keys in this order.

  • Page 95: 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) ADF* Performance Test 3.3 (V-7) Test Pattern 1 3.4 (V-8) Firmware Switch Setting 3.5 (V-9) Printout of Firmware Switch Data 3.5 (V-50) Operational Check of LCD...
  • Page 96 - - - - - - - - - - - - - - - - - - - - - - - - - - IMPORTANT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Basically, the maintenance-mode functions listed on the previous page should be accessed by service personnel only.

  • Page 97: 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 all of the EEPROM areas, but entering 91 does not initialize some areas, as listed below. Function code Data item Maintenance-mode functions...

  • Page 98: 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 99 Scanning Compensation Data List V - 6...

  • Page 100: Adf Performance Test

    ADF Performance Test Function The equipment counts the documents fed by the automatic document feeder (ADF) and displays the count on the LCD for checking the ADF performance. Operating Procedure (1) Set documents. (Allowable up to the ADF capacity.) The "DOC. READY" will appear on the LCD. (2) Press the 0 and 8 keys in this order.
  • Page 101 Test Pattern 1 Function This function, much like the copying function, prints out test pattern 1 to allow the service personnel to check for record data missing or print quality. Operating Procedure Press the 0 and 9 keys in this order in the initial stage of the maintenance mode. The figure below shows test pattern 1.
  • Page 102 Firmware Switch Setting and Printout [ A ] 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 103 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 104 Detailed Description for the Firmware Switches WSW01 (Dial pulse setting) Selector Function Setting and Specifications No. 1 2 Dial pulse generation mode 10-N No. 3 4 60 ms Break time length in pulse dialing 67 ms 40 ms (for 16 PPS) 64 ms (at 106-ms intervals) No.
  • Page 105 Selector 7: Switching between pulse (DP) and tone (PB) dialing, by the function switch This selector determines whether or not the dialing mode may be switched between the pulse (DP) and tone (PB) dialing by using the function switch. Selector 8: Default dialing mode, pulse (DP) or tone (PB) dialing This selector sets the default dialing mode (pulse dialing or tone dialing) which may be changed by the function switch.
  • Page 106 WSW03 (PABX* mode setting) Selector Function Setting and Specifications CNG detection when sharing a modular wall socket with a 0: A 1: B telephone No. 2 3 4 0 0 0 : 50 ms 0 0 1 : 210 ms Min.
  • Page 107 Selectors 6 and 7: Dial tone detection in PABX These selectors activate or deactivate the dial tone detection function which detects a dial tone when a line is connected to the PABX. Setting both of these selectors to "1" activates the dial tone detection function so that the equipment starts dialing upon detection of a dial tone when a line is connected.
  • Page 108 WSW04 (TRANSFER facility setting) Selector Function Setting and Specifications Earth function in transfer facility 0: Provided 1: Not provided No. 2 3 Dual tone detection frequency in 350 and 440 Hz (A) ICM recording 440 and 480 Hz (B) 480 and 620 Hz (C) Tone detection sensitivity in ICM 0: OFF 1: High...
  • Page 109 WSW05 (1st dial tone and busy tone detection Selector Function Setting and Specifications No. 1 2 3 0 0 0 3.5 sec. WAIT 0 0 1 7.0 sec. WAIT 0 1 0 10.5 sec. WAIT 1st dial tone detection 0 1 1 14.0 sec.
  • Page 110 Selectors 5 and 6: Busy tone detection in automatic sending mode These selectors determine whether or not the equipment automatically disconnects a line upon detection of a busy tone in automatic sending mode. Setting selector 6 to "0" ignores a busy tone so that the equipment does not disconnect the line. Setting selectors 5 and 6 to "0"...
  • Page 111 WSW06 (Pause key setting and 2nd dial tone detection) Selector Function Setting and Specifications No. 1 2 3 0 0 0 : No pause 0 0 1 : 3.5 sec. WAIT 0 1 0 : 7 sec. WAIT 0 1 1 : 10.5 sec.
  • Page 112 Selectors 1 through 3: Pause key setting and 2nd dial tone detection Selectors No WAIT is inserted even if the Pause key is pressed. If you press the Pause key during dialing, the facsimile equipment will insert WAIT as defined in the above table. If the Pause key is pressed repeatedly, the equipment inserts the specified WAIT multiplied by the number of depressions.
  • Page 113 WSW07 (Dial tone setting 1) Selector Function Setting and Specifications No. 1 2 Frequency band range Narrows by 10 Hz Initial value Widens by 10 Hz Line current detection 0: No 1: Yes No. 4 5 6 0 0 0 : -21 dBm 0 0 1 : -24 dBm...
  • Page 114 WSW08 (Dial tone setting 2) Selector Function Setting and Specifications No. 1 2 3 0 0 0 : 50 ms 0 0 1 : 210 ms 0 1 0 : 500 ms 1st dial tone detection time length 0 1 1 : 800 ms 1 0 0 : 900 ms...
  • Page 115 WSW09 (Protocol definition 1) Selector Function Setting and Specifications Frame length selection 256 octets 1: 64 octets Use of non-standard commands Allowed 1: Prohibited No. 3 4 times No. of retries 3 times 2 times 1 time T5 timer 0: 300 sec. 60 sec.
  • Page 116 WSW10 (Protocol definition 2) Selector Function Setting and Specifications Switching of DPS, following the 0: No 1: Yes CML ON/OFF Time length from transmission of 0: 100 ms 1: 50 ms the last dial digit to CML ON Time length from CML ON to CNG 0: 2 sec.
  • Page 117 WSW11 (Busy tone setting) Selector Function Setting and Specifications Narrows by 10 Hz Frequency band range Initial value Widens by 10 Hz Not used. 1: 400-600/400-600 ms 1: 175-440/175-440 ms ON/OFF time length ranges (More than one setting allowed) 1: 700-800/700-800 ms 1: 110-410/320-550 ms 1: 100-660/100-660 ms NOTE: WSW11 is not applicable in those countries where no busy tone detection is supported.
  • Page 118 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) 1500 ms (in other versions) 500 ms 700 ms 900 ms No. 3 6 sec.
  • Page 119 WSW13 (Modem setting) Selector Function Setting and Specifications No. 1 0 km Cable equalizer 1.8 km 3.6 km 5.6 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 120 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 Fixed to once Fixed to 2 times Fixed to 3 times Fixed to 4 times 1 to 2 times...
  • Page 121 WSW15 (REDIAL facility setting) Selector Function Setting and Specifications No. 1 5 minutes Selection of redial interval 1 minute 2 minutes 3 minutes No. 3 16 times 1 times No. of redialings 2 times 3 times 15 times Redialing for no response sent Redialing No redialing from the called terminal...
  • Page 122 WSW16 (Function setting 1) Selector Function Setting and Specifications Not used. CCITT superfine recommendation 0: OFF 1: ON Not used. Max. document length limitation 0: 400 cm 1: 90 cm Stop key pressed during reception 0: Not functional 1: Functional Selector 2: CCITT superfine recommendation If this selector is set to "1,"...
  • Page 123 WSW17 (Function setting 2) Selector Function Setting and Specifications No. 1 No alarm Off-hook alarm Always valid Valid except when 'call reservation' is selected. Power failure report output 1: OFF Calendar clock/prompt alternate 1: Yes display Calendar clock type U.S.A. type 1: European type Not used.
  • Page 124 WSW18 (Function setting 3) Selector Function Setting and Specifications Not used. No. 2 40 sec. Detection enabled time for CNG 0 sec. (No detection) and no tone 5 sec. 80 sec. Not used. Registration of station ID Permitted Prohibited No. 7 No monitoring Up to phase B at the calling station only...
  • Page 125 WSW19 (Transmission speed setting) Selector Function Setting and Specifications No. 1 No. 4 First transmission speed choice 2,400 bps for fallback 4,800 bps 7,200 bps 9,600 bps 12,000 bps * Last transmission speed choice for fallback 14,400 bps * Not used. V.
  • Page 126 WSW20 (Overseas communications mode setting) Selector Function Setting and Specifications EP* tone prefix 0: OFF 1: ON Overseas communications mode 0: 2100 Hz 1: 1100 Hz (Reception) Overseas communications mode 0: OFF 1: Ignores DIS once. (Transmission) No. 4 Min. time length from reception of 100 ms CFR to start of transmission of 200 ms...
  • Page 127 WSW21 (TAD setting 1) 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. No. 6 For U.S.A. Two-way recording Except for U.S.A.
  • Page 128 WSW22 (ECM and caller ID setting) Selector Function Setting and Specifications ECM* in sending 0: ON 1: OFF ECM* in receiving 0: ON 1: OFF Call Waiting Caller ID 0: ON 1: OFF Not used. 0: 0% 1: 8% 0: 0% 1: 4% Acceptable TCF bit error rate (%) (Only at 4800 bps)
  • Page 129 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 No. 2 Allowable training error rate 0.5% No. 4 Decoding error rate for transmission of RTN Issue of RTN at the occurrence of 0: Yes...
  • Page 130 Selector 7: Resolution level for reception This selector determines whether the resolution should be limited at the start of reception in the sleep mode. Selector 8: Limitation of attenuation level Setting this selector to "0" limits the transmitting level of the modem to 10 dB. This setting has priority over the settings selected by WSW02 (selectors 5 through 8) and WSW13 (selectors 5 through 8).
  • Page 131 WSW25 (TAD setting 3) Selector Function Setting and Specifications 0 sec. Delay time for starting detection 8 sec. of voice signal 16 sec. 24 sec. -43 dB (A) Detection level for no voice signal -46 dB (B) -49 dB (C) -51 dB (D) No.
  • Page 132 WSW26 (Function setting 4) Selector Function Setting and Specifications Application of DC wetting pulse 0: OFF 1: ON Overvoltage limiter at the applying 0: ON 1: OFF time of a wetting pulse Not used. No. 4 No. of CNG cycles to be detected (when the line is connected via the external telephone except in the external TAD mode)
  • Page 133 WSW27 (Function setting 5) Selector Function Setting and Specifications Definition of programmable key TEL key TEL/POLLING key Ringer OFF setting Automatic playback of OGM at the start time of OGM ON mode Detection of distinctive ringing pattern Not used. Recording quality level Normal High Sampling rate when the recording...
  • Page 134 WSW28 (Function setting 6) Selector Function Setting and Specifications No. 1 2 3 0 0 0 0 dB 0 0 1 +1 dB Transmission level of DTMF high- 0 1 0 +2 dB band frequency signal 0 1 1 +3 dB 1 0 0 0 dB 1 0 1...
  • Page 135 WSW29 (Function setting 7) Selector Function Setting and Specifications No. 1 2 3 0 0 0 -47.0 dBm 0 0 1 -48.5 dBm Compression threshold level for 0 1 0 -50.0 dBm voice signals inputted via the 0 1 1 -51.5 dBm network in the built-in TAD 1 0 0...
  • Page 136 WSW30 (Function setting 8) Selector Function Setting and Specifications No. 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...
  • Page 137 WSW31 (Function setting 9) Selector Function Setting and Specifications Not used. Default reduction rate for failure of 0: 100% 1: 75% (Letter) automatic reduction during 87% (A4) recording 95% (Legal) Not used. Minimum short-OFF duration in 0: 130 ms 1: 90 ms distinctive ringing Not used.
  • Page 138 WSW32 (Function setting 10) Selector Function Setting and Specifications Not used. No. 5 Standard Default resolution Fine Super fine Photo No. 7 Automatic Default contrast Super light Super dark Selectors 5 and 6: Default resolution These selectors set the default resolution which applies when the equipment is powered up or completes a transaction.
  • Page 139 WSW33 (Function setting 11) Selector Function Setting and Specifications No. 1 -42.5 dBm -44.0 dBm Detection threshold level for voice signals inputted via the -45.5 dBm telephone line in the built-in TAD -47.0 dBm operation -48.5 dBm -50.0 dBm -51.5 dBm -53.0 dBm No.
  • Page 140 WSW34 (Function setting 12 Selector Function Setting and Specifications No. 1 0 sec. Erasing time length of ICM tone 1 sec. recorded preceding the tone 2 sec. detection starting point in the case 3 sec. of automatic line disconnection 4 sec. due to no voice signal received 5 sec.
  • Page 141 WSW35 (Function setting 13) 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 0 1 0 : 2 sec. recording 1 0 0 : 4 sec.
  • Page 142 WSW36 (Function setting 14) Selector Function Setting and Specifications ECP mode* 0: ON Recovery from Inactive PC Interface 0: Disabled Enabled PC Power-off Recognition Time 0: Normal Long Not used. No. 6 7 8 0 0 0 : 0 (Not ignored) 0 0 1 : 4 (448 Hz) 0 1 0 :...
  • Page 143 [ B ] Printout of firmware switch data Function The equipment prints out the setting items and contents specified by the firmware switches. Operating Procedure (1) Press the 1 key twice in the initial stage of the maintenance mode. The "PRINTING" will appear on the LCD. (2) The equipment prints out the configuration list as shown in the figure below.
  • Page 144 Operational Check of LCD Function This function allows you to check whether the LCD on the control panel works normally. Operating Procedure (1) Press the 1 and 2 keys in this order in the initial stage of the maintenance mode. The LCD shows (2) Press the Start key.
  • Page 145 FAX2750/FAX-8250P MFC4350/MFC4650/MFC-9050 Key & Button Entry Order (1) V - 52...
  • Page 146 MFC6650MC/MFC-9550 FAX-8050P Key & Button Entry Order (2) V - 53...
  • Page 147 Sensor Operational Check Function This function allows you to check whether the eight sensors (document front sensor, document rear sensor, sheet feeder cover sensor, cover sensor, registration sensor, paper ejection sensor, toner sensor, and hook switch sensor*) operate correctly. (*The FAX-8250P/MFC-9050 has no hook switch sensor.) In the FAX-8250P/MFC-9050, the LCD shows the "FRRETCCVRGHATN"...
  • Page 148 CIS Scanner Area Setting Function The equipment sets the CIS scanner area and stores it into the EEPROM. Operating Procedure (1) Press the 5 key twice in the initial stage of the maintenance mode. The "SCANNER AREA SET," "BLACK LEVEL INIT," and "WHITE LEVEL INIT" will appear on the LCD in this order.
  • Page 149 3.11 Equipment Error Code Indication Function This function displays an error code of the last error on the LCD. Operating Procedure (1) Press the 8 and 2 keys in this order in the initial stage of the maintenance mode. The LCD shows the "MACHINE ERROR X X." (2) To stop this operation and return the equipment to the initial stage of the maintenance mode, press the Stop key.
  • Page 150 3.13 Cancellation of the Memory Security Mode Function This procedure can cancel the memory security mode. Use this procedure if the user forgets his/her password entered when setting the memory security mode so as not to exit from the memory security mode. NOTE: Carrying out this procedure will lose passwords previously entered but retain FAX messages and ICM received in the memory security mode.
  • Page 151 CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING...
  • Page 152 CONTENTS ERROR INDICATION ................... VI-1 1.1 Equipment Errors................... VI-1 [ 1 ] Error messages on the LCD ............VI-1 [ 2 ] Error codes shown in the "MACHINE ERROR X X" message..........VI-4 1.2 Communications Errors.................. VI-6 TROUBLESHOOTING..................VI-13 2.1 Introduction....................VI-13 2.2 Precautions....................

  • Page 153: 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 and communications errors. For the communications errors, the equipment also prints out the transmission verification report and the communications list.
  • Page 154 Messages on the LCD Probable Cause n Document loading error DOCUMENT JAM (1) The document rear sensor detects no leading edge of a document within 10 seconds from the start of document loading operation. (The document rear sensor stays OFF even after the document has been fed when the document front sensor was ON.) (2) The loaded document is too short.
  • Page 155 Messages on the LCD Probable Cause PLS OPEN COVER To display the relating detailed error code, use maintenance- mode function code 82. (Refer to Chapter V, Section 3.11.) If this message appears, open and close the top cover. The message may disappear if opening/closing the top cover removes the error.

  • Page 156: 2 ] Error Codes Shown In The "Machine Error X X" Message

    [ 2 ] Error codes shown in the "MACHINE ERROR X X " message Error Code Error factor (Hex.) ( 71 Laser scanner motor does not lock. ) ( 72 Cannot detect Beam Detect signal. ) ( 73 No toner cartridge loaded. ) ( 74 Toner empty.
  • Page 157 Error Code Error factor (Hex.) ( B9 Light emission intensity error of the LED array. ) ( D5 The MODEM fails to complete the command transmission sequence. ) ( E4 Out of recording paper. ) Write error in EEPROM. ( E8 Data scanning error during transmission.

  • Page 158: Communications Errors

    Communications Errors If a communications error occurs, the facsimile equipment emits an audible alarm (intermittent beeping) for approximately 4 seconds, displays the corresponding error message, and prints out the transmission verification report if the equipment is in sending operation. VI - 6...
  • Page 159 n n Definition of Error Codes on the Communications List Calling Code 1 Code 2 Causes Wrong number called. No dial tone detected before start of dialing. Busy tone detected before dialing. 2nd dial tone not detected. No loop current detected.* Busy tone detected after dialing or called.
  • Page 160 Compatibility [checking the NSF and DIS] Code 1 Code 2 Causes Remote terminal only with V.29 capability in 2400 or 4800 bps transmission. Remote terminal not ready for polling. Remote terminal not equipped with password function or its password switch OFF. Remote terminal not equipped with or not ready for confidential mail box function.
  • Page 161 Instructions received from the remote terminal [checking the NSC, DTC, NSS, and DCS] Code 1 Code 2 Causes Illegal coding system requested. Illegal recording width requested. ECM requested although not allowed. Polled while not ready. No document to send when polled. Nation code or manufacturer code not coincident.
  • Page 162 ID checking Code 1 Code 2 Causes Password plus "lower 4 digits of telephone number" not coincident. Password not coincident. Polling ID not coincident. Entered confidential mail box ID uncoincident with the mail box Relay broadcasting ID not coincident. Entered retrieval ID uncoincident with that of the mail box ID. DCN reception Code 1 Code 2...
  • Page 163 Signal isolation Code 1 Code 2 Causes Unable to detect video signals and commands within 6 seconds after CFR is transmitted. Received PPS containing invalid page count or block count. (10) Video signal reception Code 1 Code 2 Causes Error correction sequence not terminated even at the final transmission speed for fallback.
  • Page 164 (12) Maintenance mode Code 1 Code 2 Causes Failed to detect 1300 Hz signal in burn-in operation. Failed to detect PB signals in burn-in operation. (13) Equipment error Code 1 Code 2 Causes Equipment error (For X X, refer to Section 1.1 [ 2 ].) VI - 12...

  • Page 165: Troubleshooting

    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 166: Troubleshooting Procedures

    Troubleshooting Procedures [ 1 ] Control panel related Trouble Check: (1) LCD shows nothing. Panel-main harness between the main PCB and the control panel PCB Control panel PCB Low-voltage power supply PCB Main PCB (2) Control panel inoperative. Panel-main harness between the main PCB and the control panel PCB Control panel PCB FPC key...

  • Page 167: 3 ] Communications Related

    [ 3 ] Communications related Trouble Check: (1) No tone is transmitted. Main PCB NCU PCB [ 4 ] Paper/document feeding related Trouble Check: (1) Neither "COPY: PRESS COPY" Sensors by using the maintenance-mode function nor "FAX: NO. & START" code 32.

  • Page 168: 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 169 Trouble Action to be taken (3) Light At the scanner Check the following components: - CIS unit - Main PCB At the printer side Replace the toner cartridge with a new one and print 4 to 5 pages. If the problem persists, proceed to the next step. Remove the toner cartridge and start printing.
  • Page 170 Trouble Action to be taken (5) Black and blurred vertical At the scanner stripes Check the following components: - CIS unit At the printer side Clean the paper path which may be contaminated with toner. Slide the wire cleaner tab to clean the corona wire inside the drum unit.
  • Page 171 Trouble Action to be taken (9) Faulty image registration At the printer side (Leading edge of image Instruct the user not to load paper exceeding the limit mark starts too late on paper) on the multi-purpose sheet feeder. Instruct the user to use the recommended types of paper. Replace the multi-purpose sheet feeder.
  • Page 172 Trouble Action to be taken (11) Blurred at either side At the printer side Shake the toner cartridge. If the problem persists, replace it. Check that the equipment is placed on a flat surface. Shake the drum unit from left to right and front to back. (12) Dirt back of paper At the printer side Replace the drum unit.
  • Page 173 Location of High-voltage Contacts and Grounding Contacts Grounding Contacts High-voltage Contacts ƒ For transfer roller ‚ • Drum unit ‡ For developer „ For cleaner roller roller … For grid † For corona wire Gear drive unit ‡ Drum grounding board †...
  • Page 174 July ’98 • 5X5301 Printed in Japan...
  • Page 175 FAX2750/FAX-8250P MFC4350/MFC4650/MFC6650MC MFC-9050/MFC-9550 LJ6106MFC/LJ6206MFC/L621 Appendix 1. EEPROM Customizing Codes...
  • Page 176 EEPROM Customizing Codes This function allows you to customize the EEPROM according to language, function settings, and firmware switch settings. n Operating Procedure (1) FAX2750/MFC4350/MFC4650/MFC6650MC/L621/LJ6106MFC/LJ6206MFC: To make the equipment enter the maintenance mode, press the Function, *, 2, 8, 6, and 4 keys in this order. Within 2 seconds FAX-8250P/MFC-9050/MFC-9550: To make the equipment enter the maintenance mode, press the Menu, *, 2, 8, 6, and 4 keys in this order.
  • Page 177 n EEPROM Customizing Codes List FAX2750/MFC4350/MFC4650/MFC6650MC Model Versions FAX2750 MFC4350 MFC4650 MFC6650MC U.S.A. 1001 1101 1201 1001 CANADA 0002 0102 0202 0002 ASIA 0040 0040 AUSTRALIA 0006 0006 INDONESIA 0040 0040 GULF 0001 0001 NEW ZEALAND 0027 0027 TAIWAN 0023 0023 S.
  • Page 178 FAX-8250P/MFC-9050/MFC-9550 Model Versions FAX-8250P MFC-9050 MFC-9550 GERMANY 0003 0103 0003 U.K. 0004 0104 0004 FRANCE 0005 0105 0005 NORWAY 0007 0107 0007 BELGIUM 0108 0008 NETHERLANDS 0109 0009 SWITZERLAND 0010 0110 0010 IRELAND 0011 0111 FINLAND 0112 0012 DENMARK 0013 0113 AUSTRIA 0014...
  • Page 179 FAX2750/FAX-8250P MFC4350/MFC4650/MFC6650MC MFC-9050/MFC-9550 Appendix 2. Circuit Diagrams A. Main PCB B. Network Control Unit (NCU) PCB C. Control Panel PCB D. Power Supply PCBs...
  • Page 180 FAX2750/FAX-8250P MFC4350/MFC4650/MFC6650MC MFC-9050/MFC-9550 Appendix 2. Circuit Diagrams A. Main PCB B. Network Control Unit (NCU) PCB C. Control Panel PCB D. Power Supply PCBs...
  • Page 181 A S I C M F C 2 L O C K 1 1 3 R V D D R V D D R I N G P B 5 6 6 B F A N 1 M S I L 5 3 B R V D D R V D D...
  • Page 182 + 5 B S 0 V C 9 3 + 5 V S 0 V C C 1 0 4 R 1 2 9 1 1 0 C 1 1 0 R A S 0 C C 1 0 4 1 2 B C 7 3 C C 1 0 4...
  • Page 183 + 2 4 V P 1 9 R 1 8 3 C I S + 5 V R 5 V 1 / 4 W R 5 V + 5 V C 1 3 3 Q 2 4 2 S C 3 9 2 8 A L E D / 3 5 V R 8 8...
  • Page 184 S 0 V + 5 V + 5 V R 9 0 R 8 9 B L M 1 1 A 2 0 C C 1 0 4 x 4 M 0 V M 5 V 1 6 V / 1 0 B G 3 0 8 0 / 2 S 0 V D V S S...
  • Page 185 P 2 0 5 2 0 4 5 - 1 2 4 5 # 1 2 T E N S H A H L T E N H + 5 V 1 4 B T N R + 5 V + 5 V T N O R # 1 4...
  • Page 186 + 5 V R A 7 R A 9 R A 1 1 P P F 2 7 5 0 1 . 0 K x 4 2 . 2 K x 4 2 . 2 K x 4 + 5 V M F C 4 3 5 0 A S S Y M F C 4 6 5 0...
  • Page 187 N C U 1 P 1 4 + 2 4 V B 1 2 B - P H Q 2 1 + 5 V M 5 V + 2 4 R D T C 1 1 4 Y K C M L H 1 2 B # 1 9 # 1 7...
  • Page 188 P P F 2 7 5 0 M F C 4 3 5 0 D E M O M F C 6 6 5 0 M C M F C 9 0 5 0 M F C 9 5 5 0 F A X - 8 2 5 0 P P A G E M F C 4 3 5 0...
  • Page 189 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 190 + 5 V R E F Z D 2 A - O U T R D P S 4 . 3 V X 2 Z D 1 S 0 V T E L O F F J W 9 ( 5 ) J W 7 ( 5 ) ( P 1 ) J P 9 ( C )
  • Page 191 U G 4 5 8 5 - 0 X X I T E M P H 3 T L P 6 2 0 G R T L P 6 2 0 G R D R L - 0 0 3 3 P D R L - 0 0 3 3 P 5 m m J U M P E R...
  • Page 192 R E F + 5 V S P 1 Z D 2 A - O U T R D P S Z D 1 T E L O F F S 0 V J W 9 ( 5 ) J W 7 ( 5 ) ( P 1 ) J P 9 ( C ) C M L...
  • Page 193 U G 4 5 8 8 - 0 X X I T E M P H 3 T L P 6 2 0 G R S P 2 A S S Y A S S Y A S S Y A S S Y A S S Y S P 4...
  • Page 194 F L 5 R 2 0 0 P N 4 . 3 V R E F + 5 V S P 1 Z D 2 A - O U T R D P S Z D 1 T E L O F F S 0 V J W 9 ( 5 )
  • Page 195 + 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 196 + 5 V S G N D R 1 8 R 1 9 R 1 7 1 0 0 K C 1 3 + 5 V C C 1 0 2 X 7 V S S C C 1 0 4 V D D S G N D + 5 D...
  • Page 197 Y L 2 P A N E L K E Y M A T R I X R E F E R E N C E T A B L E K E Y N O . K E Y C O E K E Y N O .

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