Installation Manual

8-138 Troubleshooting

12. Locate the backside of J24 on the Main Interface PWA labeled NEEDLE SENSORS.

13. Measure VDC between Pin 4 and Pin 5 on J24.

14. Is the reading 24 VDC?

Main Interface PWA (P/N 60-1200-00) has failed.

See

Parts Replacement section.

Go to Step 15

15. Locate backside of J24 on the Main Interface PWA labeled NEEDLE SENSORS.

16. Measure VDC between Pin 3 and Pin 2 on J24 while toggling the Needle Sensor.

17. Does the signal change from 24 VDC to 0 VDC?

Go to Step 18

Main Interface PWA (P/N 60-1200-00) has failed. See Parts

Replacement

section.

18. Check the Needle Sensor Cable (P/N 06-4599-00) for continuity (Pinout is 1 to 1).

19. Does the cable have continuity?

Needle Sensor Cable (P/N 06-4599-00) has failed.

See

Parts Replacement section.

Needle Sensor (P/N 62-1617-00) has failed. See

Parts Replacement section.

20. Locate U22 on the Main Interface PWA.

21. Measure VDC at Pin 1 on U22 while toggling the Needle Sensor (use TP1 for ground).

22. Does the signal change from 5 VDC to 0 VDC?

Main Interface PWA (P/N 60-1200-00) has failed.

See

Parts Replacement section.

Contact Asymtek Technical Support

Yes