45
• All LED lights on Upper Board should be SOLID GREEN under normal operation.
• Dim or Off LED lights:
• Check each test point and verify tolerances are within 5 % of +15 ,-15, and 5 DC voltage.
• On a old board, D16 blinks when 5V is present. New board doesn’t have indication lights.
• If 5V is not present, Check harness for continuity and verify LPB DC test points.
•Replace harness if harness is bad
•Replace upper board if harness and LPB are good .
Troubleshooting UPB
To Next Page
Loading...
