Lincoln Electric INVERTEC V300-I, Service Manual

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INVERTEC V300-I
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F-22
TROUBLESHOOTING & REPAIR
SWITCH BOARD TEST
(continued)
TABLE F.3 — SWITCH BOARD RESISTANCE TEST.
ELECTRIC SHOCK can kill.
Observe all safety precautions detailed
throughout this manual.
WARNING
Apply Positive Apply Negative
Test Prove 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 shure that Switch Boards are changed in matched pairs. Never mix an old style (different part
number) Switch