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Brother International IntelliFax-4750 Service Manual - Page 223

Blm11b102s, Lancs P.u.

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USB LAN ROMCS2 DAST EAT LANCS P.U. EEPROM(LAN)CLK P.U. SUPER CAP. FLASH EXROM EXRAM HOOK USB LAN NCU2 CI US FAX5750 ASSY. 5 LG2332001 No. XT1 NOT ASSY C32 NOT ASSY C33 0 R21 R22 R59 R71 R66 R117 R116 R60 R77 C12 #1 R12 R250 NOT ASSY NOT ASSY 100 100 NOT ASSY NOT ASSY 100 33K 33K 5.5V/0.047F 16MbitFLASH NOT ASSY NOT ASSY P18 C1 P2 P5 R227 R151 P17 Q3 Q4 R6 R10 R11 R16 R17 R18 C29 P1 R5 P15 R187 R194 NOT ASSY 10V/100 DHB-PB40 B2B-PH 100 0 NOT ASSY NOT ASSY NOT ASSY NOT ASSY NOT ASSY NOT ASSY NOT ASSY NOT ASSY NOT ASSY 0 DHB-PB34 100 NOT ASSY NOT ASSY NOT ASSY EUR FAX8750P ASSY. 25 LG2365001 XTAL48.00MHZ Cera C50 C100CH Cera C50C 100CH 3.3K 100 100 100 100 BLM11B102S BLM11B102S 33K 33K 5.5V/0.22F 32MbitFLASH 3.3K 0 52340-0501 10V/100 (7mm height) NOT ASSY NOT ASSY NOT ASSY 100 USB-212-T KRA107S KRC107S 3.3K 1.5K 1.5K 1.5K 10K 1M CC25C104 DHB-PB34 100 B6B-PH 120K 0 A Main PCB 7/7 (FAX5750/FAX8750P)

Section	Page
FAX4750, FAX5750, FAX8350P, FAX8750P, MFC8300, MFC8600, MFC8700, MFC9650 Parts and Service Manual.pdf	1
CHAPTER I. GENERAL DESCRIPTION	6
1. EQUIPMENT OUTLINE	7
1.1 External Appearance and Weight	7
1.2 Components	7
2. SPECIFICATIONS	8
CHAPTER II. INSTALLATION	25
1. INSTALLING THE UPDATE DATA TO THE	26
CHAPTER III. THEORY OF OPERATION	29
1. OVERVIEW	30
2. MECHANISMS	31
2.1 Scanner Mechanism	32
2.1.1 Document feeding and ejecting mechanism	32
2.1.2 Scanner	32
2.2 Laser Printing Mechanism	33
2.2.1 Paper pick-up and registration mechanism	33
2.2.2 Print process mechanism	34
(1) Charging process	35
(2) Exposing process	35
(3) Developing process	36
(4) Transferring process	36
2.2.3 Heat-fixing mechanism	37
2.2.4 Paper ejecting mechanism	38
2.3 Sensors and Actuators	39
3. CONTROL ELECTRONICS	41
3.1 Configuration	41
3.2 Main PCB	42
3.3 Engine PCB	44
3.4 NCU PCB	45
3.5 Control Panel PCB	48
3.6 Power Supply PCB	49
[ 1 ] Low-voltage power supply PCB	49
[ 2 ] High-voltage power supply PCB	50
CHAPTER IV. DISASSEMBLY/REASSEMBLY AND	52
1. DISASSEMBLY/REASSEMBLY	54
Safety Precautions	54
Preparation	55
How to Access the Object Component	55
Disassembly Order Flow	56
1.1 Rear Cover	57
1.2 Access Plates R and F	57
1.3 Control Panel ASSY	58
1.4 Panel Rear Cover and Control Panel	59
1.5 Document Feed Roller ASSY, Document Ejection Roller ASSY, and Pinch Rollers	62
1.6 CIS Unit	63
1.7 Scanner Frame ASSY (Scanner Motor, Scanner Drive Unit, Document Take-in Roller,	64
1.8 Top Cover (Exit Roller, Speaker, and Document Guides)	68
1.9 Handset Mount and Hook Switch PCB (for models equipped with a handset)	74
1.10 Paper Sub Tray	76
1.11 VC Cover, VC Bracket, and VC Connector PCB (for models supporting video capture)	77
1.12 Front Cover	78
1.13 Outer Chute and Paper Pinch Rollers	79
1.14 Main Cover	80
1.15 Switch Cover	81
1.16 Laser Unit	82
1.17 Heat-fixing Unit and FU Lamp	83
1.18 Fan	87
1.19 Drive Gear ASSY and Main Motor ASSY	89
1.20 NCU Shield and NCU PCB	91
1.21 Bottom Plate, Main PCB, and Bottom Insulation Film	93
1.22 Low-voltage Power Supply PCB and Power Inlet	97
1.23 Inner Insulation Film, High-voltage Power Supply PCB, Engine PCB, and 2nd Cassette Relay	99
1.24 Toner Sensor (light-receiver) PCB and Toner Sensor (LED) PCB	101
1.25 Gears and Paper Pick-up Roller	102
1.26 Paper Feed Roller ASSY	103
1.27 Clutch Levers, Cassette Guide L, and Solenoid	104
1.28 Paper Cassette	105
1.29 Cleaning of High-voltage Contacts and Grounding Contacts	106
2. LUBRICATION	108
[ 1 ] Document feed roller ASSY and document ejection roller ASSY	108
[ 2 ] Control panel locks	109
[ 3 ] Scanner frame ASSY, document take-in roller and its shaft, and separation roller and	109
[ 4 ] Top cover	110
[ 5 ] Drive gear ASSY	111
[ 6 ] Paper cassette	112
CHAPTER V. MAINTENANCE MODE	114
1. ENTRY INTO THE MAINTENANCE MODE	115
2. LIST OF MAINTENANCE-MODE FUNCTIONS	116
3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS	118
3.1 EEPROM Parameter Initialization	118
3.2 Printout of Scanning Compensation Data	119
3.3 ADF Performance Test	121
3.4 Test Pattern 1	122
3.5 Firmware Switch Setting and Printout	123
3.6 Operational Check of LCD	169
3.7 Operational Check of Control Panel PCB	169
3.8 Receiver Volume Adjustment (applicable to the American version only)	171
3.9 Sensor Operational Check	172
3.10 CIS Scanner Area Setting	173
3.11 EEPROM Customizing	173
3.12 Erasure of Received FAX Messages Temporarily Stored in the Flash Memory (not applicable to	174
3.13 Equipment Error Code Indication	174
3.14 Output of Transmission Log to the Telephone Line	175
3.15 Cancellation of the Memory Security Mode (applicable to the European version only)	175
CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING	177
1. ERROR INDICATION	178
1.1 Equipment Errors	178
[ 1 ] Error messages on the LCD	178
[ 2 ] Error codes shown in the \	181
1.2 Communications Errors	183
2. TROUBLESHOOTING	193
2.1 Introduction	193
2.2 Precautions	193
2.3 Checking prior to Troubleshooting	193
2.4 Troubleshooting Procedures	195
[ 1 ] Control panel related	195
[ 2 ] Telephone related	195
[ 3 ] Communications related	196
[ 4 ] Paper/document feeding related	196
[ 5 ] Print-image related	197
Location of High-voltage Contacts and Grounding Contacts	204
Appendix 1. EEPROM Customizing Codes	206
Appendix 2. Circuit Diagrams	209
A. Main PCB (FAX4750/MFC8300/MFC8600/MFC8700/FAX8350P/MFC9650)	210
A. Main PCB (FAX5750/FAX8750P)	217
B. Modem PCB	224
C. Engine PCB	227
D. NCU PCB	229
E. Control Panel PCB	234
F. Power Supply PCB	236
pl_fax8350_8750_mfc9650.pdf	241
List1(MAIN FRAME)	244
List2(DOCUMENT SCANNER)	246
List3(LASER UNIT)	248
List4(PAPER TRANSPORT)	250
List5(PAPER TRAY)	252
List6(HEAT FIXING UNIT)	254
List7(COVER)	256
List8(CONTROL PANEL)	258
List9(PCB ASSY)	260
List10(ACCESSORIES)	262
List11(PRINTED MATERIAL)	264
List12(CARTON)	266
FAX4750pc.pdf	268
List1(MAIN FRAME)	271
List2(DOCUMENT SCANNER)	273
List3(LASER UNIT)	275
List4(PAPER TRANSPORT)	277
List5(PAPER CASSETTE)	279
List6(HEAT FIXING UNIT)	281
List7(COVER)	283
List8(CONTROL PANEL)	285
List9(PCB ASSY)	287
List10(ACCESSORIES)	289
List11(PRINTED MATERIAL)	291

Match case Limit results 1 per page

EUR

FAX5750

FAX8750P

ASSY. 5

ASSY. 25

LG2332001

LG2365001

No.

USB

XT1

NOT ASSY

XTAL48.00MHZ

C32

NOT ASSY

Cera C50

C100CH

C33

Cera C50C

100CH

R21

NOT ASSY

3.3K

R22

NOT ASSY

100

LAN

R59

100

R71

100

ROMCS2

R66

NOT ASSY

100

DAST

R117

NOT ASSY

BLM11B102S

EAT

R116

100

BLM11B102S

LANCS P.U.

R60

33K

EEPROM(LAN)CLK P.U.

R77

33K

SUPER CAP.

C12

5.5V/0.047F

5.5V/0.22F

FLASH

16MbitFLASH

32MbitFLASH

R12

NOT ASSY

3.3K

R250

NOT ASSY

EXROM

P18

NOT ASSY

52340-0501

10V/100

(7mm height)

EXRAM

DHB-PB40

NOT ASSY

HOOK

B2B-PH

NOT ASSY

R227

100

NOT ASSY

R151

100

USB

P17

NOT ASSY

USB-212-T

NOT ASSY

KRA107S

NOT ASSY

KRC107S

NOT ASSY

3.3K

R10

NOT ASSY

1.5K

R11

NOT ASSY

1.5K

R16

NOT ASSY

1.5K

R17

NOT ASSY

10K

R18

NOT ASSY

C29

CC25C104

LAN

DHB-PB34

100

NCU2

P15

NOT ASSY

B6B-PH

R187

NOT ASSY

120K

R194

NOT ASSY

Main PCB

7/7

(FAX5750/FAX8750P)