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TROUBLESHOOTING & REPAIR
F-22 F-22
V160-S & -T
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WAVEFORM ON EACH GATE
5us/div
10V/div
Take note that you need an oscilloscope insulated from
the supply line to do this measure
TEST PROCEDURE
1. Locate 6 gate points indicated on Figure
F.11.
2. Connect scope probe, set at 5us/div +
10V/div, and check waveform on each
gate with ground probe to pin 2 in
molex J1.
MAIN IGBT INVERTER BOARD V160-S/T
“WELDING LOGIC AND INVERTER” SECTION TEST
(continued)
1 3 5 7 9
2 4 6 8 10
NUMBERING
GROUND
FIGURE F.11 MAIN IGBT INVERTER BOARD LOCATION