Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B - Manual (Page 125)

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POWER WAVE 450
F-65 F-65
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)
TABLE F.2 – SWITCH BOARD 1 RESISTANCE TEST TABLE
TROUBLESHOOTING & REPAIR
Apply Apply
Positive Negative
Test Test
Probe to Probe to Test Repair Next
Terminal Terminal Result Conclusion Action Procedure
2T 12A Greater OK None Continue
than 1K
ohm
Less than Replace 4 Snubber
100 ohms Shorted Switch Resistor
Boards Test
12A 2T Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9A 1T Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
1T 9A Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
2T 9A Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9A 2T Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 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).