Lincoln Electric INVERTEC STT, Service Manual

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TROUBLESHOOTING & REPAIR
F-36 F-36
INVERTEC STT
Apply Positive Apply Negative
Test Probe 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
SWITCH BOARD TEST (continued)
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).
TABLE F.5 – SWITCH BOARD RESISTANCE TEST (continued)
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.