Lincoln Electric INVERTEC SVM129-B Service Manual page 74

F-36
TABLE F.5 – SWITCH BOARD RESISTANCE TEST (continued)
Apply Positive Apply Negative
Test Probe to Test Probe to
Terminal Terminal
12 401/403
401/403 12
9 402/404
402/404 9
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 new switch board (new part number).
8. Reconnect all wiring harness leads (401/403,
1/8, 9, 12, 4/5, 402/404) to the switch board.
9. Install the case wraparound cover.
TROUBLESHOOTING & REPAIR
SWITCH BOARD TEST (continued)
Test Result Conclusion Repair Action
Greater than OK
1K ohm
Less than Shorted
100 ohms
Less than OK
100 ohms
Greater than Open
1K ohm
Less than OK
100 ohms
Greater than Open
1K ohm
Greater than OK
1K ohm
Less than Shorted
100 ohms
INVERTEC STT
Next Procedure Notes
None Continue
Replace both Snubber Test
switch boards
None Continue
Replace both Snubber Test
switch boards
None Continue
Replace both Snubber Test
switch boards
None Continue
Replace both Snubber Test
switch boards
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