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Compak Power Supply Trouble Shooting Sheet
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- Checking for failed Bridge Rectifier, Chopper Transistor and Inverter Transistor
- Any "Zero" ohm reading will constitute a bad Semi-Conductor
- Meter Required: Standard Analog VOM OR DVOM with Diode Test
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Meter Hook Up |
VOM
(RX1 Scale) |
DVOM
(Diode Test) |
| A to C |
(+)A/(-)C, (-)D&(+)E |
Open |
Open |
| A to D |
(-)A/(+)C, (+)D&(+)E |
~10 Ohms |
0.4V |
| then |
(+)B/(-)C, (-)D&(+)E |
~10 Ohms |
0.4V |
| A to E |
(-)B/(+)C, (+)D&(+)E |
Open |
Open |
(+) Positive Meter Lead
(-) Negative Meter Lead |
| Meter Hook Up |
VOM
(RX1 Scale) |
DVOM
(Diode Test) |
| (+)A to (-)B |
Open |
Open |
| (-)A to (+)B |
~20 Ohms |
0.4V |
| (+)A to (-)C |
~20 Ohms |
0.4V |
| (-)A to (+)C |
Open |
Open |
| (+)B to (-)C |
~40 Ohms |
0.8V |
| (-)B to (+)C |
Open |
Open |
| (+)D to (-)E* |
Slight Deflection, Then Open |
Open |
| (+)G to (-)F* |
Slight Deflection, Then Open |
Open |
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(+) Positive Meter Lead
(-) Negative Meter Lead
*Use Highest Resistance Scale and Measure with Gate Leads Disconnected
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