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TROUBLESHOOTING & REPAIR
POWER MODULE TEST (continued)
FIGURE F.26 – IGBT TEST
POWER MODULE (CHOPPER PC BOARD)
REMOVE LEADS
HEAT SINK
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CHECK IGBT FOR “SHORTS”
5.Using the analog ohmmeter, connect the pos- itive meter probe to the heat sink and the neg- ative meter probe to the positive capacitor ter- minal on the chopper PC board. See Figure F.26. The resistance reading should be very high (over 20,000 ohms).
6.Reverse the meter probe leads. The resis- tance should be very high (over 20,000 ohms). It the resistance is low in either Step 5 or 6, the IGBT may be shorted or leaky.
7.Repeat Steps 4 and 5 for the other module.
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