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TROUBLESHOOTING & REPAIR
F-41 F-41
RANGER 250
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POWER MODULE TEST (continued)
FIGURE F.18 – IGBT TEST
HEAT SINK
POSITIVE (+)
CAPACITOR
TERMINAL
CONNECTIONS
Check IGBT for “Shorts”
8. Using the analog ohmmeter, connect the
positive meter probe to the heat sink and the
negative meter probe to the positive capaci-
tor terminal on the power module chopper
PC board. See Figure F.18. The resistance
reading should be high (over 20,000 ohms).
9. Reverse the meter probe leads. The resis-
tance should be very high (over 20,000
ohms). It the resistance is low in either Step
8 or 9, the IGBT may be shorted or leaky.