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Brother MFC-970MC, FAX-931, FAX-921 service manual Theory of Operation

Models: MFC-970MC FAX-931 FAX-921

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Specification Install Code list Error codes Appendix 2. Circuit Diagrams Signal isolation Printer Fault Maintenance Configuration Command reception

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CHAPTER III.

THEORY OF OPERATION

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Brother MFC-970MC, FAX-931, FAX-921 service manual Theory of Operation

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Contents

Facsimile Equipment Page Appendix Eeprom Customizing Codes Circuit Diagrams Preface Chapter Contents External Appearance and Weight Components Specifications FAX870MC MFC970MC Model Name FAX-910 FAX-920/921 Model Name FAX-930/931 MFC-925 Installation Theory of Operation Control Electronics Overview Transmitting Mechanism Feeding and scanning documents Automatic document feeder ADF Scanner Receiving Mechanism Feeding paper and printing data Power Transmission Mechanism Structure of the gear train Description of planetary gear system Power transmission for four operation modes Scanning mode Solenoid OFF, Motor rotation Reverse Arm B Blocked by Section of Clutch Lever Active Gears Recording mode Solenoid OFF, Motor rotation Forward Active Gears on the Inner Side of the Drive Unit Copying mode Solenoid ON, Motor rotation Forward Active Gears on the Inner Side of the Drive Unit Power transmission route III Sensors and Actuators Location of Sensors and Actuators III Configuration Control Electronics Main PCB Page NCU PCB European versions III Control Panel PCB Power Supply PCB DISASSEMBLY/REASSEMBLY, Lubrication and Adjustment IV-47 DISASSEMBLY/REASSEMBLY Safety Precautions Tightening Torque List How to Access the Object Component Preparation Disassembly Order Flow ROM Cover, Battery ASSY* and Ribbon Shaft Stopper Reassembling Notes Control Panel Assy Disconnect the panel-main harness Panel Rear Cover and Control Panel Page Page Page Reassembling Notes LF Roller Assy and CIS Unit Peel off the black CIS film Page Reassembling Notes Page Page Page Reassembling Notes Recording Paper Cover Assy and Paper Guides Page Page Page Page Page Page Page Remove the two screws and lift up the paper feed chute Page Page Reassembling Notes Cover Stopper and Platen Frame Assy Page Bottom Plate Power Supply PCB, Main PCB, and NCU PCB Page Reassembling Notes Page Drive Unit, Motor, and Main-Head Harness Panel-lock Leaf Springs Cover Sensor Actuators and Pinch Roller Page Handset Mount,* Hook Switch PCB,* and Dummy Mount Harness Routing Lubrication Page LF roller Assy Platen frame Assy Page Separation roller and main frame Maintenance Mode Output of Transmission Log to the Telephone Line Entry Into the Maintenance Mode List of MAINTENANCE-MODE Functions Page Operating Procedure Eeprom Parameter Initialization Function Printout of Scanning Compensation Data Function Scanning Compensation Data List ADF Performance Test Function Test Pattern Function Firmware Switches WSW01 through WSW36 Operating Procedure Detailed Description for the Firmware Switches Selector 8 Default dialing mode, pulse DP or tone PB dialing WSW03 PABX* mode setting Selectors 6 and 7 Dial tone detection in Pabx WSW04 Transfer facility setting WSW05 1st dial tone and busy tone detection Selector 7 Busy tone detection in automatic receiving mode WSW06 Pause key setting and 2nd dial tone detection Selectors 4 through 6 Detection of international tone These selectors set the detection level of the 2nd dial tone WSW08 Dial tone setting Station in automatic sending CML ON/OFF WSW11 Busy tone setting WSW12 Signal detection condition setting These selectors set the optimum receive signal level WSW14 Auto ANS facility setting No. of redialings Times WSW16 Function setting OFF No tone WSW19 Transmission speed setting Selector Function Setting and Specifications EP* tone prefix WSW21 TAD setting WSW22 ECM and caller ID setting WSW23 Communications setting TCF WSW24 TAD setting WSW25 TAD setting Pseudo ring backtones in F/T mode WSW27 Function setting WSW28 Function setting WSW29 Function setting WSW30 Function setting WSW31 Function setting WSW32 Function setting Low Comfortable noise level Medium High WSW34 Function setting WSW35 Function setting Printout of firmware switch data Function Operational Check of LCD Function Operational Check of Control Panel PCB Function Key & Button Entry Order Sensor Operational Check Function FRE Fine Adjustment of Scanning Start/End Position Function CIS Scanner Area Setting Function Eeprom Customizing Function Equipment Error Code Indication Function Output of Transmission Log to the Telephone Line Function Document Draw Adjustment Error Indication and Troubleshooting VI-12 Equipment Errors Error messages on the LCD Printer Fault Error codes shown in the Machine Error message Page Communications Errors Definition of Error Codes on the Communications List Calling Command reception Compatibility checking the NSF and DIS Page ID checking DCN receptionTCF transmission/reception Signal isolation Video signal receptionGeneral communications-related Maintenance mode Equipment error Precautions Checking prior to TroubleshootingIntroduction Troubleshooting Procedures 1 Control panel related Telephone related Communications related Paper/document feeding related Print-image related Others July ’98 Appendix 1. Eeprom Customizing Codes Eeprom Customizing Codes Eeprom Customizing Codes List Germany Appendix 2. Circuit Diagrams Main PCB 1/5 FAX750/FAX770/FAX-910 FAX-920/FAX-921/MFC-925 Main PCB 2/5 Main PCB 3/5 Page Page Main PCB 1/6 Main PCB 2/6 FAX870MC/MFC970MC/FAX-930 FAX-931 Main PCB 3/6 FAX870MC/MFC970MC/FAX-930 FAX-931 Page Main PCB 5/6 FAX870MC/MFC970MC/FAX-930 FAX-931 Page NCU U S L NCU 1/2 NCU 2/2 N E E M NCU France NCU CHINA, India Control Panel 1/2 Y C O E 0 8 W 1 3 S 6 / 6 C 0 K O 1 K O 2 K O 3 K O 4 K O 5 K O Page Page Parts Reference List Page Countries Page Platen Frame Attachment ROM COVER, GRAY1267 Control Panel ASSY, GRAY1395, FAX-930 for FRA Control PANEL, GRAY1395, FAX-940 for FRA KEY,ONE TOUCH, WHITE1397, FAX-920/930 for ARL/NZ NCU PCB ASSY, FAX-920/930/MFC-970MC for ARL Telephone Line CORD, FAX-920 for ISR UU0628010 Including Operations Manual FAX-921/931/MFC-925 Including Operations Manual FAX-920/930/MFC-925 Operations MANUAL, FAX-910 for GER Operations MANUAL, FAX-920/930/940/MFC-925 for FRA CARTON, Brother FAX-920 for NOR/FIN/DEN/SWE Page REF.NO Code QTY Description

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