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TROUBLESHOOTING & REPAIR
IGBT/SWITCH BOARD TEST (G3165-1)
TABLE F.6 – NOTE: This test will NOT determine if an individual IGBT device is open.
Apply | Apply |
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Positive | Negative |
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Test | Test |
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Probe to | Probe to | Test |
| Repair | Next |
Terminal | Terminal | Result | Conclusion | Action | Procedure |
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2/4 | 12 | Greater than | OK | None | Continue |
|
| 1k ohms |
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| Less | Shorted | Replace | Snubber |
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| than 1K |
| Switch | Resistor |
|
| ohms |
| Boards | Test |
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9 | 1/3 | Greater | OK | None | Continue |
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| than 1K |
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| ohms |
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| Less than | Shorted | Replace | Snubber |
|
| 1k ohms |
| Switch | Resistor |
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|
|
| Boards | Test |
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2/4 | 9 | Less | OK | None | Continue |
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| than 100 |
|
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| ohms |
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| Greater than | Open | Replace | Snubber |
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| 1k ohms |
| Switch | Resistor |
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| Boards | Test |
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9 | 2/4 | Greater than | OK | None | Continue |
|
| 1k ohms |
|
|
|
|
| Less | Shorted | Replace | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohms |
| Boards | Test |
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NOTE: K ohm = ohm reading multiplied by 1000.
NOTE: Always make sure that all four Switch Boards are changed at the same time. Never mix an old style (different part number) Switch Board with a new style (new part number).
