M/A-Com P5100 Series, Maintenance Manual

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MAINTENANCE
5.5 TROUBLESHOOTING PROCEDURES
Table 5-1: Symptoms and Procedures for 60 Hz Power Supply 19A149979P1
SYMPTOM PROCEDURE
No output voltage at J801
Check the following:
1. Open F1, F3 or S1.
2. AC voltage on W801.
3. Open D1, D2, D3, or D4.
No output voltage at F801A
Check the following:
4. Open F1, F2 or S1.
5. AC voltage on W801.
6. Open D1, D2, D3, or D4.
Low output voltage on F801A.
0 < Vo < 25.0 VDC
Check the following:
7. If one of the dual diodes on D1, D2, D3, or D4
is shorted.
NOTE : All four diode packages contain two
diodes each.
8. Line frequency < 60 Hz.
9.
Load current greater than 15.0 amps.
Low output voltage on J801.
0 < Vo < 12.5 VDC
Check the following:
10. If one of the dual diodes on D1, D2, D3, or D4
is shorted.
NOTE : All four diode packages contain two
diodes each.
11. Line frequency < 60 Hz.
12. Load current greater than 3.0 amps
.
High output voltage on F801A
(>30.0 VDC) or J801 (>16.3 VDC).
Check the following:
13. R1 not connected between pos. 1 and 2 on
F801A.
14. R2 not connected between pos. 1 and 4 on
J801.
15. Line frequency >60 Hz.
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