Chapter 3 Theory Of Operation; Electronics; General Block Diagram - Brother mfc8440 Service Manual

CHAPTER 3
1.

ELECTRONICS

1.1

General Block Diagram

Fig. 3-1 shows a general block diagram.
Control
panel
Line NCU* Speaker
THEORY OF OPERATION
Control Section
ADF unit Scanner unit
- ADF - CCD unit
motor - CCD motor
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Host Computer
Centronics
parallel interface
Printer
data
Fax data
Laser printing unit
Charging, exposing,
developing,
transferring, and
heat-fixing processes
- Electrical charger
- Laser unit
(including the polygon
motor)
- Laser-sensitive drum
- Developer roller
- Transfer roller
- Heater roller
- Main motor
*Provided on models supporting facsimile function.
Fig. 3-1
3-1
SERVICE MANUAL
USB interface
Paper Low- and
feeding high-voltage
mechanism power
supplies
AC