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Brother International MFC 9760 Service Manual - Page 84

Disconnect the short heater wire of the heater harness from the left end of the heat-fixing unit.

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(4) Remove three screws (two "a" and one "b"). (5) Disconnect the long heater wire (of the heater harness) from the upper center of the heat-fixing unit. (6) Disconnect the short heater wire (of the heater harness) from the left end of the heat-fixing unit. (7) Lift up the heat-fixing unit and disconnect the heater thermistor harness from the engine PCB. "a": Stepped screw "b": Taptite, cup S M3x8 IV - 38

Section	Page
CHAPTER I. GENERAL DESCRIPTION	6
1. MACHINE 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 FACSIMILE MACHINE	26
2. SETTING ID CODES TO FACSIMILE MACHINES	28
CHAPTER III. THEORY OF OPERATION	30
1. OVERVIEW	31
2. MECHANISMS	32
2.1 Scanner Mechanism	33
2.2 Laser Printing Mechanism	35
2.2.1 Paper pick-up and registration mechanism	35
2.2.2 Print process mechanism	36
2.2.3 Heat-fixing mechanism	38
2.2.4 Paper ejecting mechanism	39
2.3 Sensors and Actuators	40
3. CONTROL ELECTRONICS	43
CHAPTER IV. DISASSEMBLY/REASSEMBLY AND	45
1. DISASSEMBLY/REASSEMBLY	47
Safety Precautions	47
Preparation	48
How to Access the Object Component	48
Disassembly Order Flow	49
1.1 Lower Rear Cover	50
1.2 Access Plates R and F	50
1.3 Paper Cassette	51
1.4 Document Tray ASSY	52
1.5 Upper Rear Cover	54
1.6 ADF Unit and Document Tray Open Sensor	55
1.7 Scanner Unit and Control Panel ASSY	62
1.8 Relay PCB	71
1.9 Speaker	72
1.10 Scanner Mount	73
1.11 Paper Sub Tray and Tray Holder	76
1.12 VC Cover, VC Bracket, and VC Connector PCB (for models supporting	77
1.13 Front Cover	78
1.14 Outer Chute and Paper Pinch Rollers	79
1.15 Main Cover	80
1.16 Switch Cover (for models not equipped with a power switch)	81
1.17 Laser Unit	82
1.18 Heat-fixing Unit and FU Lamp	83
1.19 Fan	97
1.20 Drive Gear ASSY and Main Motor ASSY	99
1.21 NCU Shield and NCU PCB	101
1.22 Bottom Plate, Main PCB, and Bottom Insulation Film	103
1.23 Low-voltage Power Supply PCB and Power Inlet	107
1.24 Inner Insulation Film, High-voltage Power Supply PCB, Engine PCB, and 2nd Cassette Relay PCB	109
1.25 Toner Sensor (light-receiver) PCB and Toner Sensor (LED) PCB	111
1.26 Gears and Paper Pick-up Roller	112
1.27 Paper Feed Roller ASSY	113
1.28 Clutch Levers, Cassette Guide L, and Solenoid	114
1.29 Cleaning of High-voltage Contacts and Grounding Contacts	115
2. LUBRICATION	117
[ 1 ] ADF unit	117
[ 2 ] Scanner mount	118
[ 3 ] Drive gear ASSY	119
[ 4 ] Paper cassette	120
CHAPTER V. MAINTENANCE MODE	122
1. ENTRY INTO THE MAINTENANCE MODE	123
2. LIST OF MAINTENANCE-MODE FUNCTIONS	124
3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS	127
3.1 EEPROM Parameter Initialization	127
3.2 Printout of Scanning Compensation Data	128
3.3 ADF Performance Test	130
3.4 Test Pattern 1	131
3.5 Firmware Switch Setting and Printout	132
[ A ] Firmware switch setting	132
[ B ] Printout of firmware switch data	134
3.6 Operational Check of LCD	135
3.7 Operational Check of Control Panel PCB	135
3.8 Sensor Operational Check	138
3.9 CCD Scanner Area Setting	140
3.10 EEPROM Customizing	140
3.11 Erasure of Received FAX Messages Temporarily Stored in the Flash Memory (Not applicable to the American version)	141
3.11A Display of the Equipment's Log Information	142
3.12 Machine Error Code Indication	143
3.13 Output of Transmission Log to the Telephone Line (Not applicable to machines w/o fax)	143
3.14 Cancellation of the Memory Security Mode (Not applicable to the American version or machines w/o fax)	144
CHAPTER VI. ERROR INDICATION AND TROUBLESHOOTING	146
1. ERROR INDICATION	147
1.1 Machine Errors	147
[ 1 ] Error messages on the LCD	147
[ 2 ] Error codes shown in the \	151
1.2 Communications Errors (Not applicable to machines w/o fax)	153
2. TROUBLESHOOTING	163
2.1 Introduction	163
2.2 Precautions	163
2.3 Checking prior to Troubleshooting	163
2.4 Troubleshooting Procedures	165
[ 1 ] Control panel related	165
[ 2 ] Telephone related	165
[ 3 ] Communications related	166
[ 4 ] Paper/document feeding related	166
[ 5 ] Print-image related	167
[ 6 ] PC-driven or video capture-driven printing	173
Location of High-voltage Contacts and Grounding Contacts	174
Appendix 1. EEPROM Customizing Codes	176
Appendix 2. Firmware Switches (WSW)	179
Appendix 3. Circuit Diagrams	228
A. Main PCB (MFC9800/MFC9880/MFC9860/MFC9760)	229
A. Main PCB (MFC9700/DCP1400)	235
B. Engine PCB	241
C. Engine PCB	242
D. NCU PCB	243
E. Control Panel PCB	247