Lincoln Electric V160-S Service Manual page 82

F-22
MAIN IGBT INVERTER BOARD V160-S/T
"WELDING LOGIC AND INVERTER" SECTION TEST (continued)
FIGURE F.11 MAIN IGBT INVERTER BOARD LOCATION
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.
TROUBLESHOOTING & REPAIR
V160-S & -T
F-22
1 3 5 7 9
NUMBERING
2 4 6 8 10
GROUND