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F-73 F-73
IGBT/SWITCH BOARD TEST (G3165-1)
TABLE F.6 – NOTE: This test will NOT determine if an individual IGBT device is open.
TROUBLESHOOTING & REPAIR
POWER WAVE 450
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Apply Apply
Positive Negative
Test Test
Probe to Probe to Test Repair Next
Terminal Terminal Result Conclusion Action Procedure
2/4 12 Greater than OK None Continue
1k ohms
Less Shorted Replace Snubber
than 1K Switch Resistor
ohms Boards Test
9 1/3 Greater OK None Continue
than 1K
ohms
Less than Shorted Replace Snubber
1k ohms Switch Resistor
Boards Test
2/4 9 Less OK None Continue
than 100
ohms
Greater than Open Replace Snubber
1k ohms Switch Resistor
Boards Test
9 2/4 Greater than OK None Continue
1k ohms
Less Shorted Replace Snubber
than 1K Switch Resistor
ohms Boards Test
NOTE: K ohm = ohm reading multiplied by 1000.
NOTE: Always make sure that all four Switch Boards are changed at the same time. Never
mix an old style (different part number) Switch Board with a new style (new part
number).