One Touch H800 - Troubleshooting PS;2 Keyboard Malfunctions; Troubleshooting MCR Functionality

FEB-4720 Main Board
CN4 2nd VGA 2x8 PIN header connector connects to the mainboard CN6
PIN No. Description
1
RED
2
GREEN
3
BLUE
4
NC
5
GND
6
GND
7
GND
8
GND
9
NC
10
GND
11
NC
12
SM DATA
13
SM CLK
14
V-SYNC
15
H-SYNC
CN7 COM4 2x5 PIN header connector connects to the mainboard CON22
Pin No. Description PinNo. Description
1
COM4_DCD
2
COM4_DSR
3
COM4_SIN
4
RTS
5
COM4_SOUT
6
CTX
7
DTR
8
RI
9
GND NC
10
CN8 PS/2 keyboard signal and DC power connector
An 8 wire cable connects to the primary I/O board 9000PB0560 CON9, to receive power for the
2
nd
. LCD panel, VFD and PS/2 keyboard.
PIN No. Description
1
KB-DATA
2
KB-CLK
3
+5V
4
+5V
5
GND
6
GND
7
+12V
+12V
8
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