Control Panel Pcb - Brother IntelliFax-3550 Service Manual

3.5

Control Panel PCB

The control panel PCB and the main PCB communicate with each other by serially transmit-
ting commands and data.
The control panel unit consists of a gate array, an LCD, and LEDs, which are controlled by
the gate array according to commands issued from the FAX engine on the main PCB.
The calendar clock is backed up by the backup circuit on the main PCB.
The panel FPC is a flexible keyboard PCB which integrates the key matrix having rubber
keytops.
FAX
Engine
+5B
Main PCB
SDIN
SDOUT
PCLK
+5V
Backup
Circuit
Control Panel PCB and its Related Circuit
Control Panel PCB
Serial
Communications
Ports
Gate Array
I/O Ports
+5V
POWER
Reset
RESET
Circuit
III – 27
LCD
Panel FPC
(Key Matrix)
LED
S