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Brother FAX-921, MFC-970MC, FAX-931 service manual Contents

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

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

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CONTENTS

1.	EQUIPMENT OUTLINE		I-1
	1.1	External Appearance and Weight	I-1
	1.2	Components	I-1
2.	SPECIFICATIONS		I-2

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Brother FAX-921, MFC-970MC, FAX-931 service manual Contents

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Contents

Facsimile Equipment Page Preface Appendix Eeprom Customizing Codes Circuit Diagrams Chapter Contents Components External Appearance and Weight Specifications FAX870MC MFC970MC Model Name FAX-910 FAX-920/921 Model Name FAX-930/931 MFC-925 Installation Theory of Operation Control Electronics Overview Automatic document feeder ADF Transmitting Mechanism Feeding and scanning documents Scanner Receiving Mechanism Feeding paper and printing data Structure of the gear train Power Transmission Mechanism 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 Control Electronics Configuration Main PCB Page NCU PCB European versions III Control Panel PCB Power Supply PCB DISASSEMBLY/REASSEMBLY, Lubrication and Adjustment IV-47 Safety Precautions DISASSEMBLY/REASSEMBLY Tightening Torque List Preparation How to Access the Object Component 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 Eeprom Parameter Initialization Function Operating Procedure 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 TCF WSW23 Communications setting 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 Control Panel PCB Function Operational Check of LCD Function Key & Button Entry Order FRE Sensor Operational Check Function Fine Adjustment of Scanning Start/End Position Function Eeprom Customizing Function CIS Scanner Area Setting Function Output of Transmission Log to the Telephone Line Function Equipment Error Code Indication Function Document Draw Adjustment Error Indication and Troubleshooting VI-12 Error messages on the LCD Equipment Errors Printer Fault Error codes shown in the Machine Error message Page Communications Errors Command reception Definition of Error Codes on the Communications List Calling Compatibility checking the NSF and DIS Page TCF transmission/reception ID checkingDCN reception General communications-related Signal isolationVideo signal reception Equipment error Maintenance mode Introduction PrecautionsChecking prior to Troubleshooting Telephone related Troubleshooting Procedures 1 Control panel related Paper/document feeding related Communications 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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