Brother FAX4750 Service Manual page 21

1. OVERVIEW........................................................................................................... III-1
2. MECHANISMS...................................................................................................... III-2
2.1 Scanner Mechanism.................................................................................... III-3
2.1.1 Document feeding and ejecting mechanism .......................................... III-3
2.1.2 Scanner ................................................................................................ III-3
2.2 Laser Printing Mechanism ........................................................................... III-4
2.2.1 Paper pick-up and registration mechanism ............................................ III-4
2.2.2 Print process mechanism ...................................................................... III-5
(1) Charging process.......................................................................... III-6
(2) Exposing process ......................................................................... III-6
(3) Developing process ...................................................................... III-7
(4) Transferring process ..................................................................... III-7
2.2.3 Heat-fixing mechanism........................................................................... III-8
2.2.4 Paper ejecting mechanism ..................................................................... III-9
2.3 Sensors and Actuators................................................................................. III-10
3. CONTROL ELECTRONICS.................................................................................. III-12
3.1 Configuration............................................................................................... III-12
3.2 Main PCB.................................................................................................... III-13
3.3 Engine PCB................................................................................................. III-15
3.4 NCU PCB .................................................................................................... III-16
3.5 Control Panel PCB ...................................................................................... III-19
3.6 Power Supply PCB ...................................................................................... III-20
[ 1 ] Low-voltage power supply PCB .................................................... III-20
[ 2 ] High-voltage power supply PCB ................................................... III-21
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