Brother International IntelliFax-3550 Service Manual - Page 32

Main PCB, cuitry, and analog circuits for scanning, printing, and power transmission shifting.

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3.2 Main PCB The main PCB, which is the nucleus controlling the entire operation of the equipment, consists of a FAX engine (ASIC), memories, MODEM, motor drive circuits, sensor detection circuitry, and analog circuits for scanning, printing, and power transmission shifting. Centronics (MFC4450/ parallel interface 4550/4550plus/ 6550MC/7550MC/ 7650MC/9000/9500) Modular connector for PC interface (RS-232C) (FAX3550/3650/8000P/8200P) ROMs ASIC DRAM(s) E2PROM(s) Main PCB Control panel Relay PCB Main motor driver Image processor Fan 2 Main motor Solenoid Low-voltage power supply PCB Document sensor PCB Extended RAM connector Extended I/O connector for optional serial interface board (RS-232C and RS-422) (MFC6550MC/7550MC/ 7650MC/9000/9500) Scanner motor driver Scanner motor Amplifiers MODEM Analog switch operational amplifiers Speaker NCU PCB Hook switch PCB E2PROM: DRAM: Electrically Erasable Programmable Read-only Memory Dynamic Random Access Memory Block Diagram of Main PCB III - 13

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III –
13
Centronics
parallel interface
(FAX3550/3650/8000P/8200P)
DRAM(s)
ROMs
Extended RAM
connector
MODEM
Extended I/O
connector for
optional serial
interface board
(RS-232C and
RS-422)
E
2
PROM(s)
Analog switch
operational
amplifiers
Amplifiers
Scanner
motor driver
Image
processor
Main motor
driver
Fan 2
Main motor
Solenoid
Low-voltage
power supply
PCB
Document
sensor PCB
Scanner
motor
Speaker
NCU PCB
Hook switch
PCB
Main PCB
ASIC
Relay PCB
Control panel
3.2
Main PCB
The main PCB, which is the nucleus controlling the entire operation of the equipment, con-
sists of a FAX engine (ASIC), memories, MODEM, motor drive circuits, sensor detection cir-
cuitry, and analog circuits for scanning, printing, and power transmission shifting.
E
2
PROM:
Electrically Erasable Programmable Read-only Memory
DRAM:
Dynamic Random Access Memory
Block Diagram of Main PCB
Modular
connector for PC interface
(RS-232C)
(MFC6550MC/7550MC/
7650MC/9000/9500)
(MFC4450/
4550/4550plus/
6550MC/7550MC/
7650MC/9000/9500)