GE MAC 3500

4-38 MAC™ 3500 Resting ECG Analysis System Revision L 
2021337-036
Troubleshooting: CPU PCB Input/Output Signals
17 G4
18 G5 (MSB)
19 Ground
20 B0 (LSB)
21 B1
22 B2
23 B3
24 B4
25 B5 (MSB)
26 Ground
27 Data Enable
28 3V Power
29 3V Power
30 NC
31 NC
Power Supply/Motor, J11
Pin No. Signal
1 Motor Encoder B
2 5V Power
3 Motor A
4 Motor Encoder A
5 Ground
6 Motor B
7 NC
8 28V Power
9 Ground
10 Battery Charge LED
11 28V Power
12 Ground
13 Door Open Detect
14 Ground
LCD, J10 (Continued)