Lincoln Electric INVERTEC V300-PRO SVM105-B - Manual (Page 58)

V300-PRO
TROUBLESHOOTING & REPAIR F-28 F-28
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SWITCH BOARD TEST (CONT.)
Apply Positive Apply Negative
Test Prove to
Test Probe to
Terminal Terminal Test Result Conclusion Repair Action Next Procedure Notes
12 401/403 Greater than OK None Continue
1K ohm
Less than Shorted Replace both Snubber Test
100 ohms Switch Boards
401/403 12 Less than OK None Continue
100 ohms
Greater than Open Replace both Snubber Test
1K ohm Switch Boards
9 402/404 Less than OK None Continue
100 ohms
Greater than Open Replace both Snubber Test
1K ohm Switch Boards
402/404 9 Greater than OK None Continue
1K ohm
Less than Shorted Replace both Snubber Test
100 ohms Switch Boards
TABLE F.3
SWITCH BOARD RESISTANCE CHECKS