Lincoln Electric SVM101-B service manual Switch Board Test

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F-27		TROUBLESHOOTING & REPAIR				F-27
		SWITCH BOARD TEST (CONT.)
			TABLE F.2
		SWITCH BOARD RESISTANCE CHECKS
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

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 newer style.

V300-I