Ericsson GE MASTR II 19A149979P1, Maintenance Manual

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TROUBLESHOOTING PROCEDURES
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:
1. Open F1, F2 or S1.
2. AC voltage on W801.
3. Open D1, D2, D3, or D4.
Low output voltage on F801A.
0 < Vo < 25.0 Vdc
Check the following:
1. If one of the dual diodes on D1, D2, D3, or D4 is shorted.
NOTE: All four diode packages contain two diodes each.
2. Line frequency < 60 Hz.
3. Load current greater than 15.0 amps.
Low output voltage on J801.
0 < Vo < 12.5 Vdc
Check the following:
1. If one of the dual diodes on D1, D2, D3, or D4 is shorted.
NOTE: All four diode packages contain two diodes each.
2. Line frequency < 60 Hz.
3. Load current greater than 3.0 amps.
High output voltage on F801A
(>30.0 Vdc) or J801 (>16.3 Vdc). Check the following:
1. R1 not connected between pos. 1 and 2 on F801A.
2. R2 not connected between pos. 1 and 4 on J801.
3. Line frequency >60 Hz.
Table 1 - 60 Hz Power Supply 19A149979P1
LBI-38551
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