Service manual

Theory
3-17
I/O External Connectors
The following external connectors are mounted on the I/O PCBA. Additional external connectors are
mounted on the CPU PCBA. Refer to CPU PCBA on page 3-5 for their descriptions.
Table 4: External Connectors on the I/O PCBA
Connectors Description
Alarm
connector
RJ-11 style, 6 pin
1- ALARM, COMMON
2- N/C
3- ALARM, NORM. OPEN
4- +12V
5- N/C
6- GND
Audio
connectors
3.5 mm size, stereo, female
IN
1- GND
2- Right
3- GND
4- GND
5- Left
OUT
1- GND
2- Right
3- NC
4- NC
5- Left
Left and Right inputs are grounded when no
plug is inserted
Keyboard
connector
RJ-9 style, 4 pin
1- GND
2- CLK
3- +5V
4- DATA
16
front view
top view
female input
1 - GND
5
4
left
3
2
right
41
front view