Panasonic Panafax UF-4000, Service Manual

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6.2.6. PNL PC Board
The PNL PC Board Assembly consists of the Panel CPU, LCD Module with BackLight, LED, A-Point
Sensor, B4-Width Sensor (Specified Destinations only) and Key Switches.
The Panel CPU is interfaced to the main CPU on the SC PC Board. The CPU controls LCD and LED by the
command signals from the main CPU, which also detects the signals of Key Switches and Sensors.
Energy Saver (Sleep Mode)
The Main Power Supply is controlled by the Energy Saver signal (nPWSAVE).
By the command signals from the Main CPU, the Panel CPU controls the Energy Saver Sleep Mode by
changing the "nPWSAVE" signal level to "Low" (Enable) or "High" (Disable).
When the A-Point Sensor is triggered or the Energy Saver Key is pressed, the Panel CPU sends the
command signal by itself (the Main CPU is sleeping in Sleep Mode), which in turn changes the "nPWSAVE"
signal to "High" level disabling the Sleep Mode.
Panel CPU
mPD780022A (NEC)
GND
8.00MHz
32.768kHz
*RESET
XIN
Main
CPU
Panel Reset
LCD Module
LCD Control
Data
Serial I/F
Power Down
Energy Saver
Power Module Control
Buzzer Clock
Energy Saver Release
GND
LED Matrix
LED Control
LED Data Out
Key Matrix
Key Scan
Output Control
Key Input Data
XOUT
XTIN
XTOUT
B4 Width Sensor
Sensor Input
Clock Output
PWDWN
A-Point Sensor
Input Control
Energy Saver Key Input
Back Light Control
A-Point Sensor
A-Point Sensor Input
BUZ
PLC
The two data streams (LCD Data Bus, Key Scan Output) are transferred on same data bus. *
ANI6
(nWAKUP)
(nPWSAVE)
Energy Saver LED Control
Panel CPU
(SC PCB)