Lincoln Electric SVM129-B service manual Table F.5 Switch Board Resistance Test

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F-35 F-35

TROUBLESHOOTING & REPAIR

SWITCH BOARD TEST (continued)

TABLE F.5 – SWITCH BOARD RESISTANCE TEST

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

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).

INVERTEC STT