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TROUBLESHOOTING & REPAIR
F-23 F-23
V160-S & -T
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CHECK THE IGBT S FOR SHORTS
(AN OPEN STATUS NORMALLY IS EVIDENT)
CHECK FOR THERMAL
PROTECTION (~ 36 OHMS)
CHECK THE OUTPUT
DIODES FOR SHORTS
CHECK FOR (~ 1K OHMS)
CHECK THE DIODES FOR SHORTS
TEST PROCEDURE
1. Locate test points on inverter
board. See Figure F.12.
2. Check IGBT and diodes for shorts.
3. Check thermal protector for ~ 36
ohms.
4. Check lower left section as marked
for ~ 1K Ohms.
MAIN IGBT INVERTER BOARD V160-S/T
“WELDING LOGIC AND INVERTER” SECTION TEST
(continued)
FIGURE F.12 MAIN IGBT INVERTER BOARD LOCATION