Brother MFC-970MC, FAX-921, FAX-931 - page 13

CONTENTS

1. OVERVIEW...............................................................................................................III-1

2. MECHANISMS..........................................................................................................III-2

2.1 Transmitting Mechanism (Feeding and scanning documents).........................III-2

2.1.1 Automatic document feeder (ADF)...........................................................III-2

2.1.2 Scanner.....................................................................................................III-3

2.2 Receiving Mechanism (Feeding paper and printing data).................................III-4

2.3 Power Transmission Mechanism......................................................................III-5

2.3.1 Structure of the gear train.........................................................................III-5

2.3.2 Description of planetary gear system........................................................III-6

2.3.3 Power transmission for four operation modes..........................................III-7

2.3.4 Power transmission route..........................................................................III-14

2.4 Sensors and Actuators......................................................................................III-16

3. CONTROL ELECTRONICS......................................................................................III-19

3.1 Configuration.....................................................................................................III-19

3.2 Main PCB..........................................................................................................III-20

3.3 NCU PCB..........................................................................................................III-22

3.4 Control Panel PCB............................................................................................III-24

3.5 Power Supply PCB............................................................................................III-25

Contents

Main Page PREFACE Page Page 1. EQUIPMENT OUTLINE I - 2 2. SPECIFICATIONS I - 3 I - 4 I - 5 Page Page Page Page 2. MECHANISMS Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 3. CONTROL ELECTRONICS Page Page Page Page Page Page Page Page 1. DISASSEMBLY/REASSEMBLY IV - 2 Tightening Torque List Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 2. LUBRICATION Page Page Page Page Page Page 1. ENTRY INTO THE MAINTENANCE MODE 2. LIST OF MAINTENANCE-MODE FUNCTIONS Page 3. DETAILED DESCRIPTION OF MAINTENANCE-MODE FUNCTIONS Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 1. ERROR INDICATION Page VI - 3 [ 2 ] Error codes shown in the "MACHINE ERROR _ _" message VI - 4 NOTE: Four-digit error codes listed above are preceded by MACHINE ERR instead of MACHINE ERROR. Page Page Page Page Page Page Page 2. TROUBLESHOOTING Page Page Page Page Page Page EEPROM Customizing Codes n EEPROM Customizing Codes List Page Page AMain PCB 1/5 FAX-920/FAX-921/MFC-925) AMain PCB 2/5 FAX-920/FAX-921/MFC-925) 12345678 21 3 4 5 6 7 8 A AMain PCB 3/5 FAX-920/FAX-921/MFC-925) Page Page AMain PCB 1/6 AMain PCB 2/6 FAX-931) AMain PCB 3/6 Page AMain PCB 5/6 Page (FAX750/FAX770/FAX-920) (U.S.A., CANADA, GULF, NEW ZEALAND, ISRAEL) B NCU (U.S.A., CANADA, GULF, NEW ZEALAND, ISRAEL) ( ) ( ) ** * BNCU 1/2 * (GERMANY, U.K., AUSTRALIA, NORWAY, SWITZERLAND, IRELAND, DENMARK, SWEDEN) BNCU 2/2 C 8 ' - ' S H O WS UN - MO U N T I N G S P 1 7 S P 1 0 BNCU 1/2 (BELGIUM, HOLLAND, FINLAND, AUSTRIA, SPAIN, ITALY, PORTUGAL, ASIA, HONG KONG, TAIWAN, INDONESIA) I T E M S P 2 S P 7 BNCU 2/2 S P 4 ' - ' S H O WS UN - MO U N T I N G S P 9 S P 1 1 (FRANCE) ( )( )( ) () ( ) (CHINA, INDIA) ( ) ( ) CControl Panel 1/2 (FAX750/FAX770/FAX-910/FAX-920/ FAX-921/MFC-925) P 2 52089-1420 P 1 S L W1 3 S - 5 C 7 P3 S6 B - P H J W2 K I 0 K I 1 K I 2 K I 3 K I 4 2 25 K O 0 K O 1 K O 2 K O 3 K O 4 K O 5 K O 6 1 9 2 1 3 63 5 1 4 1 7 3 0 3 1 3 3 1 0 1 2 1 3 3 2 3 4 6 7 9 2 6 2 8 1 8 1 5 4 2 5 2 7 2 3 C Control Panel 1/2 P 2 52089-1420 P 1 HL W 1 3 S- 6 / 6 C 7 C K I 0 K I 1 K I 2 K I 3 K I 4 2 25 K O 0 K O 1 K O 2 K O 3 K O 4 K O 5 K O 6 1 9 2 1 3 63 5 1 4 1 7 3 0 3 1 3 3 1 0 1 2 1 3 3 2 3 4 6 7 9 2 6 2 8 1 8 1 5 4 2 5 2 7 2 3 Page Page Page Page NOTES FOR USING THIS PARTS REFERENCE LIST