Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B - Manual (Page 129)

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POWER WAVE 450
F-69 F-69
TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)
TABLE F.4 – SWITCH BOARD 3 RESISTANCE TEST TABLE
Apply Apply
Positive Negative
Test Test
Probe to Probe to Test Repair Next
Terminal Terminal Result Conclusion Action Procedure
4T 12C Greater OK None Continue
than 1K
ohm
Less than Replace 4 Snubber
100 ohms Shorted Switch Resistor
Boards Test
12C 4T Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9C 3T Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
3T 9C Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
4T 9C Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9C 4T 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).