GE MAC 3500

4-36 MAC™ 3500 Resting ECG Analysis System Revision L 
2021337-036
Troubleshooting: CPU PCB Input/Output Signals
CPU PCB Input/Output Signals
Battery Pack/Monitor, J2
Pin No. Signal
1 18V Battery Power
2 18V Battery Power
3 Battery Temperature Sense
4 3V Temperature Sense Power
5 Battery Ground
6 Battery Ground
LCD Backlight, J4
Pin No. Signal
1 12V Power
2 12V Power
3 12V Power
4 Ground
5 Ground
6 Brightness Select
7 Backlight Enable
8 NC
9 Ground
10 Ground
Keyboard, J8
Pin No. Signal
1 NC
2 NC
3 NC
4 NC
5 NC
6 Sense4
7 Sense2
8 Sense1
9 Sense0