Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B - Manual (Page 132)

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POWER WAVE 450
F-72 F-72
TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)
TABLE F.5 – SWITCH BOARD 4 RESISTANCE TEST TABLE (Continued)
Apply Apply
Positive Negative
Test Test
Probe to Probe to Test Repair Next
Terminal Terminal Result Conclusion Action Procedure
12D 3B Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
3B 12D Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
12D 407 Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
407 12D Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9D 408 Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
408 9D 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).