Brother FAX-170 Service Manual page 32

FAX-170/190/510/HOME FAX
:
1 SW3, hook switch sensor (microswitch) (This sensor serves no function in those ver-
sions equipped with a Binatone handset.)
2 SW2, cover switch sensor (microswitch)
3 SW1, paper empty sensor (microswitch)
4 Reset IC which turns on at the powering-on sequence and at any of the reset opera-
tions.
5 Connector for the control panel
6 FAX engine (ASIC) which integrates a CPU, digital portion of a MODEM and gate array
for managing the I/Os, memories, and drivers.
XT2, oscillator which oscillates at 16 MHz for the CPU.
7
8 XT1, oscillator which oscillates at 32.768 kHz for the calendar clock.
9 XT3, oscillator which oscillates at 20.736 MHz for the MODEM.
Connector for the cutter HP sensor
:
a Backup circuit for the calendar clock of the control panel
4
1
2
5
3
Main PCB Circuit Diagram 1/4
III – 19
7
6
9
8
a