Table Of Contents - Brother FAX255 Service Manual

CHAPTER III. THEORY OF OPERATION
1. OVERVIEW ..................................................................................................... III-1
2. MECHANISMS ................................................................................................ III-2
2.1 Transmitting Mechanism (Feeding and scanning documents) ...............
2.1.1 Automatic document feeder (ADF)..................................................
2.1.2 Scanner ........................................................................................... III-3
2.2 Receiving Mechanism (Feeding recording paper and printing data) ...... III-4
2.2.1 Anti-curl system (ACS) ....................................................................
2.2.2 Automatic cutter ..............................................................................
2.2.3 Recorder .......................................................................................... III-4
2.3 Power Transmission Mechanism ...........................................................
2.3.1 Structure of the gear train ...............................................................
2.3.2 Description of planetary gear system ..............................................
2.3.3 Power transmission for four operation modes .................................
[ 1 ] Recording mode (Solenoid: OFF, Motor rotation: Forward) ........
[ 2 ] Scanning mode (Solenoid: OFF, Motor rotation: Reverse) ..........
[ 3 ] Copying mode (Solenoid: ON OFF, Motor rotation: Forward) ... III-11
[ 4 ] Cutter driving mode (Solenoid: ON, Motor rotation: Reverse) .....
2.3.4 Power transmission route ...............................................................
2.4 Sensors and Actuators ...........................................................................
3. CONTROL ELECTRONICS ...........................................................................
3.1 Configuration ........................................................................................... III-17
3.2 Main PCB ................................................................................................ III-18
3.3 NCU PCB ................................................................................................ III-20
3.4 Control Panel PCB .................................................................................
3.5 Power Supply PCB ................................................................................
CONTENTS
III-2
III-2
III-4
III-4
III-5
III-5
III-7
III-8
III-9
III-10
III-12
III-14
III-15
III-17
III-22
III-23