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F-74 F-74
IGBT/SWITCH BOARD TEST (Continued)
TABLE F.6 (Continued)
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
12 1/3 Less than OK None Continue
100 ohms
Greater Open Replace Snubber
than 1K Switch Resistor
ohms Boards Test
1/3 12 Greater OK None Continue
than 1K
ohms
Less than Shorted Replace Snubber
1k ohms Switch Resistor
Boards Test
12 401/403 Greater OK None Continue
405/407 than 1K
ohms
Less than Shorted Replace Snubber
1k ohms Switch Resistor
Boards Test
401/403 12 Less than OK None Continue
405/407 100 ohms
Greater Open Replace Snubber
than 1K Switch Resistor
ohms Boards Test
9 402/404 Less than OK None Continue
406/408 100 ohms
Greater Open Replace Snubber
than 1K Switch Resistor
ohms Boards Test
402/404 9 Greater OK None Continue
406/408 than 1K
ohms
Less than Shorted Replace Snubber
1k ohms Switch Resistor
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).