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Brother International IntelliFax-4750 Service Manual - Page 239

Power Supply Pcb, Transfb, Transch2, R88 R103, Vr101, R95 R94, R34 Vr21, Devch, D25 D24

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Page 239 highlights

R129 R115 D109 R90 R92 Q83 DEV2 8 DEVCH 5 DEV1 4 TRANSFF 1 TRANSCH1 TRANSFB 2 TRANSCH2 R125 R124 R123 Q102 R134 R127 R126 R105 VR101 R104 C101 R106 C108 R102 C102 R128 R107 D101 C107 Q101 R108 D103 Q103 R131 R130 R133 R132 R113 R112 C103 C105 C104 C106 R110 R109 R121 D108 R120 R122 D110 D104 B101 R88 R103 IC81 R114 R93 R95 R94 D81 R85 R86 C81 R101 C87 R84 R82 Q82 R83 D85 R91 R87 C82 C83 D86 Q81 R89 D84 D83 DB82 CB82 CB81 RB82 R81 RB81 B102 DB81 GRID C51 R51 VR51 Z51 R35 R21 R22 R24 R33 Q21 R23 R32 R31 Q28 R26 R27 C22 R25 Q29 Q22 R34 VR21 C21 R36 PC21 C25 R43 VR22 R44 R45 R46 R47 R48 R49 D25 D24 C26 Q24 Q25 Q26 Q27 D23 C28 R9 R8 D1 R5 R6 R3 Q6 R4 R7 R11 R10 C2 Q3 Q5 R12 C5 C3 D2 + C4 D4 D5 R17 Q4 R15 Q1 R13 Q2 R14 R16 R18 + C1 D3 DB1 RB1 DB2 CB2 CB1 RB2 B1 CHG DEV R50 Power Supply PCB F High-voltage power supply (New Version) 6 0V R1 R2 CN2 0V 1 +24V 2 CN1 +24V 7 CHG 3

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

TRANSFB

TRANSCH2

TRANSFF

TRANSCH1

R81

R90

R92

Q83

R89

R108

IC81

Q81

B102

Q29

R27

R26

R17

R15

R13

DB2

DB1

RB1

R21

R35

VR51

C51

R51

GRID

Z51

DB81

DB82

DEV

R50

CHG

B101

D109

Q102

Q101

D103

R115

R129

D104

R88 R103

R114

R84

R83

R85

R102

C108

R106

C101

R104

R123

R124

R125

R126

R127

VR101

R134

R105

R82

D81

R95 R94

R93

Q82

C82

R24

R23

R36

R34 VR21

Q22

R43

VR22

RB2

CB2

CB1

R25

R18

R16

R12

R11

R10

R14

R22

R31

Q21

D84

D83

CB81

CB82

RB82

RB81

C83

D86

C103

C105

C104

C106

C102

C107

R107

R128

D101

R109

R110

R112

D108

D110

R113

R121

DEV2

DEVCH

DEV1

CHG

+24V

CN2

CN1

C22

C21

C26

D25 D24

R44

R45

R46

R47

R48

R49

PC21

D23

C28

Q25

Q24

Q26

Q27

C25

R33

Q28

R32

R91

D85

R87

C87

R101

C81

R86

R122

R120

R132

R133

Q103

R130

R131

Power Supply PCB

High-voltage power supply

(New Version)