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TROUBLESHOOTING & REPAIR
IGBT/SWITCH BOARD TEST (Continued)
TABLE F.6 (Continued)
Apply | Apply |
|
|
|
|
Positive | Negative |
|
|
|
|
Test | Test |
|
|
|
|
Probe to | Probe to | Test |
| Repair | Next |
Terminal | Terminal | Result | Conclusion | Action | Procedure |
|
|
|
|
|
|
12 | 1/3 | Less than | OK | None | Continue |
|
| 100 ohms |
|
|
|
|
| Greater | Open | Replace | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohms |
| Boards | Test |
|
|
|
|
|
|
1/3 | 12 | Greater | OK | None | Continue |
|
| than 1K |
|
|
|
|
| ohms |
|
|
|
|
| Less than | Shorted | Replace | Snubber |
|
| 1k ohms |
| Switch | Resistor |
|
|
|
| Boards | Test |
|
|
|
|
|
|
12 | 401/403 | Greater | OK | None | Continue |
| 405/407 | than 1K |
|
|
|
|
| ohms |
|
|
|
|
| Less than | Shorted | Replace | Snubber |
|
| 1k ohms |
| Switch | Resistor |
|
|
|
| Boards | Test |
|
|
|
|
|
|
401/403 | 12 | Less than | OK | None | Continue |
405/407 |
| 100 ohms |
|
|
|
|
| Greater | Open | Replace | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohms |
| Boards | Test |
|
|
|
|
|
|
9 | 402/404 | Less than | OK | None | Continue |
| 406/408 | 100 ohms |
|
|
|
|
| Greater | Open | Replace | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohms |
| Boards | Test |
|
|
|
|
|
|
402/404 | 9 | Greater | OK | None | Continue |
406/408 |
| than 1K |
|
|
|
|
| ohms |
|
|
|
|
| Less than | Shorted | Replace | Snubber |
|
| 1k ohms |
| Switch | Resistor |
|
|
|
| boards | Test |
|
|
|
|
|
|
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).
