Control Electronics; Configuration; Main Pcb - Brother FAX100 Service Manual

3. CONTROL ELECTRONICS

3.1

Configuration

The hardware configuration of the facsimile equipment is shown below.
Handset
Speaker
2-pin
6-pin
2-pin
Motor
Solenoid
12-pin
2-pin
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 circuitry, sensor detection circuitry, and analog circuits for scanning,
575M/715M)
recording, and power transmission switching.
NCU and
Power supply
Speaker
LED array and
CCD PCB
Line
2-pin 8-pin
2-pin
4-pin
*
NCU PCB
26-pin
(See NOTE
FAX
below.)
engine
*
Main PCB
LED array
Thermal recording head
NOTE: The FAX engine includes a CPU and gate array. In the FAX100/570/
615/625/635/675/575M/715M, it also includes a MODEM.
Configuration of Facsimile Equipment
ROM
2
E PROM
DRAM
FAX
engine
(ASIC)
Image
processor
2
E PROM: Electrically Erasable Programmable Read-only Memory
DRAM: Dynamic Random Access Memory
Block Diagram of Main PCB
PC
Power
supply
8-pin
PCB
1
14-pin
5-pin LCD
2
CCD
10-pin
PCB
FPC key
(except for FAX100/570/615/625/635/675/
Motor
driver
Sensors
III – 11
* On the NCU PCB are the
1
following switches:
• PE sensor (SW1)
• Cover sensor (SW2)
• Cutter sensor (SW3)
• Hook switch sensor (SW4)
* On the main PCB are the
2
following photosensors:
• Document front sensor
(PH1)
• Document rear sensor (PH2)
LEDs
13-pin
Control panel
Recording head
Motor
PCI