Brother International IntelliFax-3550 Service Manual - Page 31

Control Electronics

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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) Control panel PCB 5-pin 36-pin P15 P5 Modular connector for PC interface (FAX3550/3650/ 8000P/8200P) P1 8-pin P13 26-pin Relay *1 PCB P3 P2 5-pin 5-pin 4-pin P1 P4 12-pin Main PCB ASIC 2-pin P18 MODEM 4-pin P9 2-pin P8 Laser unit Laser diode Polygon motor LASER PRINTING UNIT Toner sensor PCB *2 High-voltage *3 3-pin Fan 1 power supply PCB 4-pin Eraser lamp board Fan 2 Main motor Solenoid Heater thermister Fixing Unit Heater (FU lamp) Extended RAM connector P2 40-pin 5-pin Low-voltage P7 power supply PCB AC line Extended I/O connector (MFC6550MC/ 7550MC/7650MC/ 9000/9500) P3 30-pin 11-pin Document *4 P4 sensor PCB 6-pin P10 LED array CCD unit Scanner motor SCANNER UNIT 2-pin P16 Speaker (Note) P6 NCU PCB 2-pin P11 Hook switch*5 PCB Line External TEL Handset (Note) 12-pin: U.S.A. versions 18-pin: European and Asian versions *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. *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

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III –
12
3.
CONTROL ELECTRONICS
3.1
Configuration
The configuration of the facsimile equipment is shown below.
Main PCB
Control
panel
PCB
Relay
PCB
*
1
ASIC
MODEM
Laser unit
Toner sensor PCB *
2
Fixing
Unit
Heater thermister
Heater (FU lamp)
Fan 2
Main motor
Solenoid
AC line
Low-voltage
power supply
PCB
Document
sensor PCB
*
4
CCD unit
LED array
Scanner
motor
Speaker
NCU PCB
Line
External TEL
Handset
36-pin
P15
P1
8-pin
P2
40-pin
P3
30-pin
5-pin
P5
P13
26-pin
P18
2-pin
4-pin
P9
P8
2-pin
P7
5-pin
P4
P10
6-pin
P16
2-pin
P6
(Note)
P11
2-pin
5-pin
5-pin
4-pin
12-pin
High-voltage
power supply PCB
*
3
Fan 1
Eraser lamp board
3-pin
4-pin
LASER PRINTING
UNIT
SCANNER
UNIT
P1
P3
P2
P4
*
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.
*
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
Polygon motor
Laser diode
*
5
Hook switch
PCB
Extended RAM
connector
(Note)
12-pin:
U.S.A. versions
18-pin:
European and Asian
versions
Centronics parallel
interface (MFC4450/
4550/4550plus/
6550MC/7550MC/
7650MC/9000/9500)
Modular
connector for
PC interface
(FAX3550/3650/
8000P/8200P)
Extended I/O
connector
(MFC6550MC/
7550MC/7650MC/
9000/9500)
11-pin