Oki OKIPAGE 10ex Troubleshooting Manual page 14

3.6 Operator Panel Control
The operator panel consists of the following circuits.
Main control board
PANEL
SSTXD-P
154
SSRXD-P
158
CPU
SSCLK-N
153
SSLD-N
152
(1) BU6152S (LSI)
This LSI is connected to a clock synchronous serial port of the CPU. It controls switch data
input, LED data output and LCD data input/output according to the commands given by the
CPU. The CPU sends the 2-byte (16-bit) command (SSTXD-P) together with the shift clock
signal (SSCLK-N) to the LSI and then makes a predetermined input/output control if the
command decoded by the LSI is found to be a normal command.
On receiving a command sent from the CPU, the LSI, synchronizing with the serial clock of
the command, returns a 2-byte command response to the CPU.
SSTXD-P
SSCLK-N
SSRXD-P
SSLD-N
40990901TH Rev.1
OLCC-2
CN1
3
4
4
3
6
1
1
6
Flexible
Cable
bit 0
Command (first)
bit 0
Command response (first)
BU6152S
DB4~DB7
RS
LSI
R/W
E
bit 7
Command (second)
bit 7
Command response (second)
LED
44780
LCD
Control
Driver
Zebra Rubber
LCD
14 /