Chapter 3 Theory Of Operation; Electronics; General Block Diagram - Brother MFC-8220 Service Manual

CHAPTER 3
1.

ELECTRONICS

1.1

General Block Diagram

Fig. 3-1 shows a general block diagram.
Control
panel
NCU*
Line Speaker
Hand set
THEORY OF OPERATION
Control Section
ADF unit Scanner unit
- CIS unit
- ADF
motor
- Scanner motor
Host Computer
Centronics
parallel interface
Fax data
Printer
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
MFC-8220
AC