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TROUBLESHOOTING & REPAIR
F-13 F-13
PRO-CUT 25
MAIN INVERTER BOARD RESISTANCE TEST (continued)
FIGURE F.3 LOCATION OF IGBT
S
(6)
RIGHT SIDE OF MACHINE
(NZL)
WRK
(EL)
Harness
Plug
Plug J1
LEAD 3
LEAD 2
IGBT’s
(6)
8. Check the IGBTs for “shorts”. Check each IGBT (6)
from Gate to Collector. Normal resistance is approx-
imately 100 ohms.
Also check each device from Gate to Emitter.
Normal resistance is approximately 40 ohms.
Check each device from Emitter to Collector.
Normal reading is high resistance in one polarity
and a low resistance in the opposite polarity.
Note: These devices will usually fail “short”resulting
in a zero or very low resistance reading. If they
“open” physical damage should be evident.
GCE