Brother MFC-4350 Manuel de service

FACSIMILE EQUIPMENTSERVICE MANUALMODEL: FAX2750/FAX-8050P/FAX-8250PMFC4350/MFC4650/MFC6650MC/MFC-9050/MFC-9550

I - 4(1/2)Model MFC4650 MFC6650MCColor White (1138) White (1138)PRINTER Yes YesEngine/Type YL (VA) YL (VA)PPM 6 ppm 6 ppmdpi (output resolution) 600 x

V - 73.3 ADF Performance Testnn FunctionThe equipment counts the documents fed by the automatic document feeder (ADF) and displaysthe count on the LCD

V - 83.4 Test Pattern 1nn FunctionThis function, much like the copying function, prints out test pattern 1 to allow the servicepersonnel to check for

V - 93.5 Firmware Switch Setting and Printout[ A ]Firmware switch settingnn FunctionThe facsimile equipment incorporates the following firmware switch

V - 10nn Operating Procedure(1) Press the 1 and 0 keys in this order in the initial stage of the maintenance mode.The equipment displays the "WSW

V - 11nn Detailed Description for the Firmware SwitchesWSW01 (Dial pulse setting)SelectorNo.Function Setting and Specifications12Dial pulse generation

V - 12l Selector 7: Switching between pulse (DP) and tone (PB) dialing, by the function switchThis selector determines whether or not the dialing mode

V - 13WSW03 (PABX* mode setting)SelectorNo.Function Setting and Specifications1CNG detection when sharing amodular wall socket with atelephone0: A 1:

V - 14l Selectors 6 and 7: Dial tone detection in PABXThese selectors activate or deactivate the dial tone detection function which detects a dial ton

V - 15WSW04 (TRANSFER facility setting)SelectorNo.Function Setting and Specifications1 Earth function in transfer facility 0: Provided 1: Not provid

V - 16WSW05 (1st dial tone and busy tone detection)SelectorNo.Function Setting and Specifications1|31st dial tone detectionNo. 1 2 30 0 0 : 3.5 sec.

I - 5(1/2)Model FAX-8050P FAX-8250PColor White (1397) White (1397)PRINTER Available *3Available with option *1Engine/Type [YL (VA)] [YL (VA)]PPM [6 pp

V - 17l Selectors 5 and 6: Busy tone detection in automatic sending modeThese selectors determine whether or not the equipment automatically disconnec

V - 18WSW06 (Pause key setting and 2nd dial tone detection)SelectorNo.Function Setting and Specifications1|3Pause key setting and 2nd dialtone detect

V - 19l Selectors 1 through 3: Pause key setting and 2nd dial tone detectionSelectors1 2 30 0 0 No WAIT is inserted even if the Pause key is pressed.0

V - 20WSW07 (Dial tone setting 1)SelectorNo.Function Setting and Specifications12Frequency band rangeNo. 1 20 0 : Narrows by 10 Hz0 1 : Initial val

V - 21WSW08 (Dial tone setting 2)SelectorNo.Function Setting and Specifications1|31st dial tone detection timelengthNo. 1 2 30 0 0 : 50 ms0 0 1 : 2

V - 22WSW09 (Protocol definition 1)SelectorNo.Function Setting and Specifications1 Frame length selection 0: 256 octets 1: 64 octets2 Use of non-stand

V - 23WSW10 (Protocol definition 2)SelectorNo.Function Setting and Specifications1Switching of DPS, following theCML ON/OFF0: No 1: Yes2Time length fr

V - 24WSW11 (Busy tone setting)SelectorNo.Function Setting and Specifications12Frequency band rangeNo. 1 20 0 : Narrows by 10 Hz0 1 : Initial value1 x

V - 25WSW12 (Signal detection condition setting)SelectorNo.Function Setting and Specifications12Min. OFF time length of callingsignal (Ci)No. 1 20 0 :

V - 26WSW13 (Modem setting)SelectorNo.Function Setting and Specifications12Cable equalizerNo. 1 20 0 : 0 km0 1 : 1.8 km1 0 : 3.6 km1 1 : 5.6 km34Rece

I - 6(1/2)Model MFC-9050 MFC-9550Color White (1138) White (1138)PRINTER Yes YesEngine/Type YL (VA) YL (VA)PPM 6 ppm 6 ppmdpi (output resolution) 600 x

V - 27WSW14 (AUTO ANS facility setting)SelectorNo.Function Setting and Specifications12Frequency band selection(Lower limit)No. 1 20 0 : 13 Hz0 1 : 15

V - 28WSW15 (REDIAL facility setting)SelectorNo.Function Setting and Specifications12Selection of redial intervalNo. 1 20 0 : 5 minutes0 1 : 1 minute1

V - 29WSW16 (Function setting 1)SelectorNo.Function Setting and Specifications1 Not used.2 CCITT superfine recommendation 0: OFF 1: ON3|6Not used.7 M

V - 30WSW17 (Function setting 2)SelectorNo.Function Setting and Specifications12Off-hook alarmNo. 1 20 0 : No alarm0 1 : Always valid1 X : Valid exce

V - 31WSW18 (Function setting 3)SelectorNo.Function Setting and Specifications1 Not used.23Detection enabled time for CNGand no toneNo. 2 30 0 : 40 se

V - 32WSW19 (Transmission speed setting)SelectorNo.Function Setting and Specifications1|3First transmission speed choicefor fallbackNo. 1 2 3No. 4 5 6

V - 33WSW20 (Overseas communications mode setting)SelectorNo.Function Setting and Specifications1 EP* tone prefix 0: OFF 1: ON2Overseas communication

V - 34WSW21 (TAD setting 1)SelectorNo.Function Setting and Specifications1|5Max. waiting time for voice signalNo. 1 2 3 4 50 0 0 0 0 : No detection0 0

V - 35WSW22 (ECM and caller ID setting)SelectorNo.Function Setting and Specifications1 ECM* in sending 0: ON 1: OFF2 ECM* in receiving 0: ON 1: OFF3

V - 36WSW23 (Communications setting)SelectorNo.Function Setting and Specifications1Starting point of training check(TCF)0: From the head of a series

I - 7(2/2)Model FAX2750 MFC4350One-touch Dial 12 x 2 12 x 2Speed Dial 100 100Tel-Index Yes YesChain Dialing Yes YesContrast SL/Auto/SD SL/Auto/SDFAX/T

V - 37l Selector 7: Resolution level for receptionThis selector determines whether the resolution should be limited at the start of reception in thesl

V - 38WSW25 (TAD setting 3)SelectorNo.Function Setting and Specifications12Delay time for starting detectionof voice signalNo. 1 20 0 : 0 sec.0 1 :

V - 39WSW26 (Function setting 4)SelectorNo.Function Setting and Specifications1 Application of DC wetting pulse 0: OFF 1: ON2Overvoltage limiter at th

V - 40WSW27 (Function setting 5)SelectorNo.Function Setting and Specifications1 Definition of programmable key 0: TEL key 1: TEL/POLLING key2 Ringer O

V - 41WSW28 (Function setting 6)SelectorNo.FunctionSetting and Specifications1|3Transmission level of DTMF high-band frequency signalNo. 1 2 30 0 0 :

V - 42WSW29 (Function setting 7)SelectorNo.Function Setting and Specifications1|3Compression threshold level forvoice signals inputted via thenetwork

V - 43WSW30 (Function setting 8)SelectorNo.Function Setting and Specifications1|3Detection level of dial tone orbusy tone for the built-in TADoperatio

V - 44WSW31 (Function setting 9)SelectorNo.Function Setting and Specifications1 Not used.2Default reduction rate for failure ofautomatic reduction dur

V - 45WSW32 (Function setting 10)SelectorNo.Function Setting and Specifications1|4Not used.56Default resolutionNo. 5 60 0 : Standard0 1 : Fine1 0 : Su

V - 46WSW33 (Function setting 11)SelectorNo.Function Setting and Specifications1|3Detection threshold level forvoice signals inputted via thetelephone

I - 8(2/2)Model MFC4650 MFC6650MCOne-touch Dial 12 x 2 12 x 2Speed Dial 100 100Tel-Index Yes YesChain Dialing Yes YesContrast SL/Auto/SD SL/Auto/SDFAX

V - 47WSW34 (Function setting 12)SelectorNo.Function Setting and Specifications1|3Erasing time length of ICM tonerecorded preceding the tonedetection

V - 48WSW35 (Function setting 13)SelectorNo.Function Setting and Specifications1|4Detection time length of thedisconnection tone in ICMrecordingNo. 1

V - 49WSW36 (Function setting 14)SelectorNo.Function Setting and Specifications1 ECP mode* 0: ON 1: OFF2 Recovery from Inactive PCInterface 0: Disable

V - 50[ B ] Printout of firmware switch datann FunctionThe equipment prints out the setting items and contents specified by the firmware switches.nn O

V - 513.6 Operational Check of LCDnn FunctionThis function allows you to check whether the LCD on the control panel works normally.nn Operating Proced

V - 52FAX2750/FAX-8250PMFC4350/MFC4650/MFC-9050Key & Button Entry Order (1)

V - 53MFC6650MC/MFC-9550FAX-8050PKey & Button Entry Order (2)

V - 543.8 Sensor Operational Checknn FunctionThis function allows you to check whether the eight sensors (document front sensor, documentrear sens

V - 553.9 CIS Scanner Area Settingnn FunctionThe equipment sets the CIS scanner area and stores it into the EEPROM.nn Operating Procedure(1) Press

V - 563.11 Equipment Error Code Indicationnn FunctionThis function displays an error code of the last error on the LCD.nn Operating Procedure(1) P

I - 9(2/2)Model FAX-8050P FAX-8250POne-touch Dial 12 x 2 12 x 2Speed Dial 50 100Tel-Index Yes YesChain Dialing Yes YesContrast SL/Auto/SD SL/Auto/SDFA

V - 573.13 Cancellation of the Memory Security Modenn FunctionThis procedure can cancel the memory security mode. Use this procedure if the user

CHAPTER VI.ERROR INDICATION ANDTROUBLESHOOTING

CONTENTS1. ERROR INDICATION...VI-11.1Equipment Errors...

VI - 11. ERROR INDICATIONTo help the user or the service personnel promptly locate the cause of a problem (if any), thefacsimile equipment incorporate

VI - 2Messages on the LCD Probable CauseDOCUMENT JAM n Document loading error(1) The document rear sensor detects no leading edge of adocument within

VI - 3Messages on the LCD Probable CausePLS OPEN COVER To display the relating detailed error code, use maintenance-mode function code 82. (Refer to

VI - 4[ 2 ] Error codes shown in the "MACHINE ERROR X X " messageError CodeX X(Hex.)Error factor( 71 Laser scanner motor does not lock. )(

VI - 5Error CodeX X(Hex.)Error factor( B9 Light emission intensity error of the LED array. )( D5 The MODEM fails to complete the command transmission

VI - 61.2 Communications ErrorsIf a communications error occurs, the facsimile equipment emits an audible alarm (intermittent beeping) for approximat

VI - 7nn Definition of Error Codes on the Communications List(1) CallingCode 1 Code 2 Causes10 08 Wrong number called.11 01 No dial tone detected befo

I - 10(2/2)Model MFC-9050 MFC-9550One-touch Dial 12 x 2 12 x 2Speed Dial 100 100Tel-Index Yes YesChain Dialing Yes YesContrast SL/Auto/SD SL/Auto/SDFA

VI - 8(3) Compatibility [checking the NSF and DIS]Code 1 Code 2 Causes32 01 Remote terminal only with V.29 capability in 2400 or 4800 bpstransmission.

VI - 9(4) Instructions received from the remote terminal [checking the NSC, DTC, NSS, and DCS]Code 1 Code 2 Causes40 02 Illegal coding system requeste

VI - 10(6) ID checkingCode 1 Code 2 Causes63 01 Password plus "lower 4 digits of telephone number" notcoincident.63 02 Password not coincide

VI - 11(9) Signal isolationCode 1 Code 2 Causes90 01 Unable to detect video signals and commands within 6 secondsafter CFR is transmitted.90 02 Receiv

VI - 12(12) Maintenance modeCode 1 Code 2 CausesE0 01 Failed to detect 1300 Hz signal in burn-in operation.E0 02 Failed to detect PB signals in burn-i

VI - 132. TROUBLESHOOTING2.1 IntroductionThis section gives the service personnel some of the troubleshooting procedures to be followed ifan error or

VI - 142.4 Troubleshooting Procedures[ 1 ] Control panel relatedTrouble Check:(1) LCD shows nothing. l Panel-main harness between the main PCB and the

VI - 15[ 3 ] Communications relatedTrouble Check:(1) No tone is transmitted. l Main PCBl NCU PCB[ 4 ] Paper/document feeding relatedTrouble Check:(1)

VI - 16[ 5 ] Print-image relatedIf the received or sent image has any problem, first make a copy with the facsimile equipment.If the copied image is n

VI - 17Trouble Action to be taken(3) Light At the scannerCheck the following components:- CIS unit- Main PCBAt the printer sidel Replace the toner car

CHAPTER II.INSTALLATION

VI - 18Trouble Action to be taken(5) Black and blurred verticalstripesAt the scannerCheck the following components:- CIS unitAt the printer sidel Clea

VI - 19Trouble Action to be taken(9) Faulty image registration(Leading edge of imagestarts too late on paper)At the printer sidel Instruct the user no

VI - 20Trouble Action to be taken(11) Blurred at either side At the printer sidel Shake the toner cartridge. If the problem persists, replace it.l Ch

VI - 21Location of High-voltage Contacts and Grounding ContactsGrounding Contacts High-voltage Contacts•‚ƒ For transfer roller‡ For developerroller† F

July ’985X5301 •Printed in Japan

FAX2750/FAX-8250PMFC4350/MFC4650/MFC6650MCMFC-9050/MFC-9550LJ6106MFC/LJ6206MFC/L621Appendix 1. EEPROM Customizing Codes

EEPROM Customizing CodesThis function allows you to customize the EEPROM according to language, function settings, andfirmware switch settings.n Ope

n EEPROM Customizing Codes List(1) FAX2750/MFC4350/MFC4650/MFC6650MCVersionsModelFAX2750 MFC4350 MFC4650 MFC6650MCU.S.A. 1001 1101 1201 1001CANADA 0

(3) FAX-8250P/MFC-9050/MFC-9550VersionsModelFAX-8250P MFC-9050 MFC-9550GERMANY 0003 0103 0003U.K. 0004 0104 0004FRANCE 0005 0105 0005NORWAY 0007 0107

FAX2750/FAX-8250PMFC4350/MFC4650/MFC6650MCMFC-9050/MFC-9550Appendix 2. Circuit DiagramsA. Main PCBB. Network Control Unit (NCU) PCBC. Control Panel P

CONTENTS1. INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT...II-1

FAX2750/FAX-8250PMFC4350/MFC4650/MFC6650MCMFC-9050/MFC-9550Appendix 2. Circuit DiagramsA. Main PCBB. Network Control Unit (NCU) PCBC. Control Panel P

AMain PCB 1/8C M P R AC M P R BC L K 2 4C S I PI P D 1I P D 2P 8 3R V D DP M 1P M 2P M 3P M 4C M P P AC M P P BS O LD R I V EV D OH V T PH V T NH V C

AMain PCB 2/8P 1 8D 1 52 62 81 3 BD 1 0D 1 1D 1 21 5R Y / B Y3 74 62 7C 7 3 C C 1 0 4A 0A 1A 2A 3A 4A 5A 6A 7A 8A 9A 1 0A 1 1A 1 2A 1 3A 1 4A 1 5A 1

AMain PCB 3/8D A R E F HD V D DD V D DD V D DT E M PA T A PA P 2A P 3T R I GM T PS D / P D 7P D 6P D 5P D 1D 0D 1D 2D 3D 4D 5D 6D 7A 0A 2A 3A 4A G N

AMain PCB 4/81 51 3T E S T 4T E S T 5M O N 11 2987M O N 3M O N 4M O N 5M O N 2C 5 8 C C 1 0 4 BR 7 21 KC 5 7C C 1 0 3 B* R 7 31 0 0 KC 5 9C C 2 2 1 C

AMain PCB 5/83212 4 R E TG E N ZV C L RT E N H1 4 B1 4 BR 8 41 . 5 KC 9 1C C 1 0 1S 0 VL O C K+ 5 VL D O N1 4 BR 1 0 82 2 KB D+ 5 VC 9 2C C 1 0 1S 0

AMain PCB 6/8+ 5 vS 0 V+ 5 BR V D DS 0 V+ 5 VD 2M A 7 0 0C 15 . 5 V4 7 3 F* C 3R 1 7 20L 1 1B L M 1 1 A 2 0R 1 7 01 K1 01 4 C- A C K1 11 4 CB U S Y1

AMain PCB 7/8R I N G OC10C N TR N G* R 3 4* R 3 73541 3 A9C10C N TC N TT L S L7 1 B1 5537 4 C101 31 2C1 47 1 BS 0 VD A R E C1 2 B1 2 A1 2 A1 2 B2D P

AMain PCB 8/8R 3 7R 3 8M F C 9 5 5 0R 1 2 3R 1 2 2R 6 4R 5 9R 6 7R 6 8R 7 0R 3 4# 1 6R 3 6R 3 3R 6 9# 7# 6P A G E124R 8 0R 3 5M F C 6 6 5 0 M CP P F

5R E F4S 0 VR A 3 5 1 x 2+ 2 6 VS 0 V+ 5 V84S 0 V6 3 14 21R E F4343S 0 V+ 2 6 VC M LC R 1M Z F - 2 4 H Go rO U A Z - S S - 1 2 4 DF G+ 5 V4 25 34312P

II - 11. INSTALLING THE UPDATE DATA TO THEFACSIMILE EQUIPMENTIf the program version is updated or the main PCB is replaced, install the update program

BNCU 1/2(Germany/U.K./Norway/Australia/Switzerland/Denmark/Sweden)L I N EEMBC-124A - O U T731364R D P SD A S N D-+R L 2P L S364+ 2 4 V+ 5 VS 0 V1243S

BNCU 2/2(Germany/U.K./Norway/Australia/Switzerland/Denmark/Sweden)I T E ML 1S P 3S P 1C 8P H 3S P 5S P 9S P 7S P 6S P 4S P 1 1S P 1 5S P 1 3S P 1 2S P

BNCU 1/2(Taiwan/Asia/Indonesia/Belgium/Ireland/Austria/Finland/Spain/Italy/Netherlands)L I N EEMBC-124A - O U T731364R D P SD A S N D-+R L 2P L S364+

BNCU 2/2(Taiwan/Asia/Indonesia/Belgium/Ireland/Austria/Finland/Spain/Italy/Netherlands)I T E MS P 2S P 7S P 6S P 4P H 3S P 1 0S P 1 2S P 1 1S P 9U G 4

BNCU(France)L I N EEMBC-124A - O U T731364R D P SD A S N D-+R L 2P L S364+ 2 4 V+ 5 VS 0 V1243S 0 V56T E L O F F1R E FP O LF G4312+MBCMBCCBMES 0 VR E

R S TK I 0K I 1P I N 0S D I NP I N 1K I 72 6# 1S D O U TP C L KT S T HK I 4K I 5K I 2L P D 6 5 6 1 2 G B+ 5 DK I 3K I 6R SR WEL C D 0L C D 1L C D 2L C

R S TK I 0K I 1P I N 0S D I NP I N 1K I 72 6# 1S D O U TP C L KT S T HK I 4K I 5K I 2L P D 6 5 6 1 2 G B+ 5 DK I 3K I 6R SR WEL C D 0L C D 1L C D 2L C

K I 0P 1 - 1 4 PK I 1K I 2K I 3K I 4K O 0 K O 1 K O 2 K O 3 K O 4 K O 5 K O 7P 1 - 1 2 PP 1 - 1 0 PP 1 - 8 PP 1 - 6 PP 1 - 1 P P 1 - 3 P P 1 - 5 P P 1

© Copyright Brother 1998All rights reserved.No part of this publication may be reproduced in anyform or by any means without permission in writingfrom

II - 2Installing the update data onto the flash ROM of the facsimile equipment(1) Load the floppy disk which stores the update data and transfer utili

CHAPTER III.THEORY OF OPERATION

CONTENTS1. OVERVIEW...III-12. MECHANISMS...

III - 11. OVERVIEW*Not provided on the FAX-8250P/MFC-9050.

III - 22. MECHANISMSThe facsimile equipment is classified into the following mechanisms:n SCANNER MECHANISM - Document feeding and ejecting mechanism-

III - 32.1 Scanner Mechanism2.1.1 Document feeding and ejecting mechanismThis mechanism consists of the document stacker, automatic document feeder (A

III - 42.2 Laser Printing Mechanism2.2.1 Paper pulling-in, registration, feeding, and ejecting mechanism

III - 5Paper pulling-in and registration mechanismThe paper pulling-in and registration mechanism consists of the pull-in roller gear (incorporated in

III - 62.2.2 Print process mechanismThe print process unit works with laser beam, electrical charges, and toner. The graph belowshows the transition

III - 7(1) Charging processThe high-voltage power supply applies DC bias to the corona wire to generate ion on the grid. Theion uniformly charges the

PREFACEThis publication is a Service Manual covering the specifications, construction, theory of operation,and maintenance of the Brother facsimile eq

III - 8(3) Developing processThe developing process develops an electrostatic latent image formed on the drum in theexposing process, into a toner ima

III - 92.2.3 Heat-fixing mechanismAs the paper passes between the heater roller and the pressure roller in the heat-fixing unit, theheater roller fuse

III - 102.3 Sensors and ActuatorsThis equipment has ten sensors: seven photosensors, two thermisters and a mechanical switch asdescribed below.Sensor

III - 11*Not provided on the FAX-8250P/MFC-9050.Location of Sensors and Actuators

III - 123. CONTROL ELECTRONICS3.1 ConfigurationThe hardware configuration of the facsimile equipment is shown below.Configuration of Facsimile Equipme

III - 133.2 Main PCBThe main PCB, which is the nucleus controlling the entire operation of the equipment, consists of aFAX engine (ASIC), memories, MO

III - 14

III - 153.3 NCU PCBThe NCU PCB switches the communications line to telephone or built-in MODEM, under thecontrol of the main PCB.U.S.A. versions

III - 16European versions

III - 173.4 Control Panel PCBThe control panel PCB and the main PCB communicate with each other by serially transmittingcommands and data.The control

SAFETY INFORMATIONLaser Safety (110-120V Model only)This printer is certified as a Class 1 laser product under the US Department of Health and HumanSe

III - 183.5 Power Supply PCB[ 1 ] Low-voltage power supply PCBThe low-voltage power supply uses the switching regulation system to generate DC power (

III - 19[ 2 ] High-voltage power supply PCBThis power supply generates high-voltage power sources from the 24V source fed from the low-voltage power s

CHAPTER IV.DISASSEMBLY/REASSEMBLY ANDLUBRICATION

iCONTENTS1. DISASSEMBLY/REASSEMBLY...IV-1n Safety Precautions...

ii2. LUBRICATION...IV-45[ 1 ] Document feed roller

IV - 11. DISASSEMBLY/REASSEMBLYnn Safety PrecautionsTo prevent the creation of secondary problems by mishandling, observe the following precautionsdur

IV - 2Tightening Torque List Location Screw type Q'ty Tightening torque Loosening torque(kg•cm) (kg•cm) Option cover Screw, pan (washer) M3x8DB

IV - 3nn PreparationPrior to proceeding to the disassembly procedure,(1) Unplug- the modular jack of the telephone line,- the modular jack of the curl

IV - 4nn Disassembly Order Flow

IV - 51.1 ROM Cover, Option Cover, and Battery ASSY*(*Provided on the FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC)(1) As shown below,

CHAPTER I.GENERAL DESCRIPTION

IV - 6(3) FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC: To replace the batteryASSY (Ni-MH battery), plug the power cord of the facsimi

IV - 71.2 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

IV - 81.3 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 tak

IV - 91.4 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 direc

IV - 101.5 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 brus

IV - 11(6) Remove the two screws from the panel rear cover.(7) Unhook the panel rear cover from eight "X" latches provided on the control pa

IV - 12(12) As shown below, insert the tip of a flat screwdriver under clamp "A" from the rear and push upclamp "A" slightly to re

IV - 131.6 Document Feed Roller ASSY and Document Ejection Roller ASSY(1) Lightly push down arm rib "a" and shift the document feed roller A

IV - 141.7 Scanner Frame ASSY(1) You can remove the following parts from the top of the scanner frame ASSY without takingout the ASSY from the top cov

IV - 15(2) Open the top cover.(3) Disconnect the scanner motor harness from the scanner motor ASSY without removing theshield film.

CONTENTS1. EQUIPMENT OUTLINE...I-11.1External Appearance and Weig

IV - 16(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 th

IV - 17(8) Turn the scanner frame ASSY upside down.(9) Remove the screw from the scanner motor and turn the motor clockwise to release from thelatch.(

IV - 18(14) Remove the pressure roller leaf springs by pulling them in the direction of arrows • and ‚ inthis order as shown below. Then remove the p

IV - 19(16) Take off the scanner drive unit by removing the two screws. The separation roller gear alsocomes off.(17) Push down the CIS side spring t

IV - 20nn Reassembling Notes• When reinstalling the scanner motor, fit it in the latch provided on the scanner frame with theconnector facing up and t

IV - 211.8 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 openthe top cov

IV - 22(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

IV - 23(8) Remove the two screws from each of the hinges R and L. The top cover stoppers also comeoff.nn Reassembling Notes• When setting each hinge

IV - 241.9 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.(

IV - 25(5) Disassemble the handset mount by unhooking two latches "a" of the upper handset mountwith a flat screwdriver.(6) Remove the hook

I - 11. EQUIPMENT OUTLINE1.1 External Appearance and WeightThe figure below shows the equipment appearance and approximate dimensions.Weight: Machine

IV - 261.10 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 le

IV - 27(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 sm

IV - 281.11 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

IV - 291.12 Bottom Plate(1) Turn the facsimile equipment upside down.(2) Remove two screws "b" from the interface connector.(3) Remove seven

IV - 30nn Reassembling Notes• When putting the bottom plate into place, secure the grounding wire to the bottom plate withscrew "e," fit the

IV - 311.13 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 P

IV - 321.14 Main PCB(1) For the FAX-8250P/MFC-9050 (French version only)/MFC-9550/MFC6650MC, take thebattery ASSY*1 out of the supports at the rear of

IV - 33*1Provided on the FAX-8250P/MFC-9050(French version only)/MFC6650MC/MFC-9550.*2Provided on the on the European, Australian,Indonesian, and Asia

IV - 34Setting up the main PCB after replacement

IV - 351.15 High-voltage Power Supply PCB(1) Remove the screw from the insulation film and high-voltage power supply PCB.(2) Remove the insulation fil

I - 2

IV - 361.16 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 disc

IV - 371.17 Registration Sensor Actuator, Sheet Feeder Cover Sensor Actuator, and Top Cover SensorActuator(1) Pull up the registration sensor actuator

IV - 381.19 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 d

IV - 39(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 clu

IV - 401.20 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 bra

IV - 41(4) Remove the screw and take off the NCU PCB from the NCU bracket.(* Provided on the European, Australian, Indonesian, and Asian versions.)nn

IV - 421.21 Scanner Grounding Plate(1) Make sure that the heat-fixing unit is removed.(2) Remove the screw from the scanner grounding plate and take i

IV - 431.22 EL (Eraser Lamp) BoardOnly when you need to replace the EL board (which is attached with double-sided adhesive tape),remove it according t

IV - 441.23 Cleaning of High-voltage Contacts and Grounding ContactsIf any toner particles, paper dust or dirt are on the contacts, clean them out. T

IV - 452. LUBRICATIONApply the specified lubricants to the lubrication points as shown below.Lubricant amountThin coat of grease(1 mm3)Half of a rice-

I - 32. SPECIFICATIONS(1/2)Model FAX2750 MFC4350Color White (1397) White (1138)PRINTER Available with option *1YesEngine/Type [YL (VA)] YL (VA)PPM [6

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

IV - 47[ 4 ] Top cover lock spring[ 5 ] Gear drive unit

CHAPTER V.MAINTENANCE MODE

CONTENTS1. ENTRY INTO THE MAINTENANCE MODE...V-12. LIST OF MAINTENANCE-MODE FUNCTIONS...

V - 11. ENTRY INTO THE MAINTENANCE MODEFAX2750/MFC4350/MFC4650/MFC6650MC: To make the equipment enter the maintenancemode, press the Function, *, 2,

V - 22. LIST OF MAINTENANCE-MODE FUNCTIONSMaintenance-mode FunctionsFunctionCode FunctionReferenceSubsection(Page)01 EEPROM Parameter Initialization 3

V - 3- - - - - - - - - - - - - - - - - - - - - - - - - - IMPORTANT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -Basically, the

V - 4 3. DETAILED DESCRIPTION OFMAINTENANCE-MODE FUNCTIONS3.1 EEPROM Parameter Initializationnn FunctionThe equipment initializes the parameters, user

V - 53.2 Printout of Scanning Compensation Datann FunctionThe equipment prints out the white and black level data for scanning compensation.nn Operati

V - 6Scanning Compensation Data List