Lincoln Electric INVERTEC V300-PRO SVM105-B - Manual (Page 57)

V300-PRO
TROUBLESHOOTING & REPAIR F-27 F-27
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SWITCH BOARD TEST (CONT.)
Apply Positive Apply Negative
Test Probe to
Test Probe to
Terminal Terminal Test Result Conclusion Repair Action Next Procedure Notes
1/8 12 Greater than OK None Continue
1K ohm
Less than Shorted Replace both Snubber Test
100 ohms Switch Boards
12 1/8 Less than OK None Continue
100 ohms
Greater than Open Replace both Snubber Test
1K ohm Switch Boards
9 4/5 Greater than OK None Continue
1K ohm
Less than Shorted Replace both Snubber Test
100 ohms Switch Boards
4/5 9 Less than OK None Continue
100 ohms
Greater than Open Replace both Snubber Test
1K ohm Switch Boards
1/8 9 Less than OK None Continue
100 ohms
Greater than Open Replace both Snubber Test
1K ohm Switch Boards
9 1/8 Greater than OK None Continue
1K ohm
Less than Shorted Replace both Snubber Test
100 ohms Switch Boards
12 4/5 Less than OK None Continue
100 ohms
Greater than Open Replace both Snubber Test
1K ohm Switch Boards
4/5 12 Greater than OK None Continue
1K ohm
Less than Shorted Replace both Snubber Test
100 ohms Switch Boards
NOTE: K ohm = ohm reading multiplied by 1000.
NOTE: Always make sure that Switch Boards are changed in matched pairs. Never mix an old style (different
part number) Switch Board with a newer style.
TABLE F.2
SWITCH BOARD RESISTANCE CHECKS