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Powermax125
Service Manual 808070
8 – Troubleshooting and System Tests
Hypertherm IGBT tester
Use the Hypertherm IGBT tester (128883) as described in the following sections, or assemble your own IGBT tester
from the schematic diagram shown in
on page 123 and use it to test the IGBTs.
Figure 7
128884
1
2
3
4
5
6
7
8
9
10
1
Test for shorted IGBT
2
Fail LED (red)
3
Pass LED (green)
4
Circuit diagram
5
Low battery LED (red)
6
Test for open IGBT
7
Rocker switch
8
Collector (red)
9
Gate (yellow)
10
Emitter (black)