Control Electronics; Configuration - Brother IntelliFax-3550 Service Manual

3. CONTROL ELECTRONICS

3.1

Configuration

The configuration of the facsimile equipment is shown below.
Centronics parallel
interface (MFC4450/
4550/4550plus/
6550MC/7550MC/
7650MC/9000/9500)
P15
Modular
connector for
P1
PC interface
8-pin
(FAX3550/3650/
8000P/8200P)
Main PCB
Extended RAM
P2
connector
40-pin
Extended I/O
P3
connector
(MFC6550MC/
30-pin
7550MC/7650MC/
9000/9500)
1
* On the relay PCB are these sensors:
• Cover sensor
• Sheet feeder cover sensor
• Registration sensor
2
* On the toner sensor PCB are these sensors:
• Toner sensor
• Toner thermister
3
* On the high-voltage power supply PCB is the paper
ejection sensor.
Control
panel
PCB
5-pin
36-pin
Relay
P5
PCB
P13
26-pin
P1
12-pin
ASIC
2-pin
P18
4-pin
MODEM
P9
2-pin
P8
Low-voltage
5-pin
P7
power supply
PCB
11-pin Document
P4
sensor PCB
6-pin
P10
2-pin
P16
(Note)
P6
2-pin
P11
Laser unit
1
*
5-pin
P3
Laser diode
5-pin
P2
Polygon motor
4-pin
Toner sensor PCB *
P4
High-voltage
power supply PCB
Fan 2
Main motor
Solenoid
4
*
LED array
CCD unit
Scanner
motor
Speaker
Line
NCU PCB
External TEL
Handset
5
*
Hook switch
PCB
4
* On the document sensor PCB are these sensors:
• Document front sensor
• Document rear sensor
5
* On the hook switch PCB is the hook switch sensor.
Configuration
III – 12
LASER PRINTING
UNIT
2
Fan 1
3
*
3-pin
Eraser lamp board
4-pin
Heater thermister
Heater (FU lamp)
AC line
SCANNER
UNIT
(Note)
12-pin: U.S.A. versions
18-pin: European and Asian
versions
Fixing
Unit