Revision L MAC™ 3500 Resting ECG Analysis System 4-392021337-036Troubleshooting: CPU PCB Input/Output SignalsThermal Printer, J12Pin No. Signal1 Thermal Printer Power2 Thermal Printer Power3 Thermal Printer Power4 Thermal Printer Power5 Thermal Printer Power6 Thermal Printer Power7 Thermal Printer Power8 Ground9 Ground10 Ground11 Ground12 Ground13 Ground14 Ground15 Cue Sense16 NC17 5V Main Power18 Ground19 Data Strobe20 Data Strobe21 Data Strobe22 Data Strobe23 Data Load24 Data Clock25 Print Head Temperature26 Pixel Data