Lincoln Electric SVM112-B service manual Table F.2 Switch Board 1 Resistance Test Table

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F-65

F-65

TROUBLESHOOTING & REPAIR

FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)

TABLE F.2 – SWITCH BOARD 1 RESISTANCE TEST TABLE

Apply	Apply
Positive	Negative
Test	Test
Probe to	Probe to	Test		Repair	Next
Terminal	Terminal	Result	Conclusion	Action	Procedure
2T	12A	Greater	OK	None	Continue
		than 1K
		ohm
		Less than		Replace 4	Snubber
		100 ohms	Shorted	Switch	Resistor
				Boards	Test
12A	2T	Less than	OK	None	Continue
		100 ohms
		Greater	Open	Replace 4	Snubber
		than 1K		Switch	Resistor
		ohm		Boards	Test
9A	1T	Greater	OK	None	Continue
		than 1K
		ohm
		Less than	Shorted	Replace 4	Snubber
		100 ohms		Switch	Resistor
				Boards	Test
1T	9A	Less than	OK	None	Continue
		100 ohms
		Greater	Open	Replace 4	Snubber
		than 1K		Switch	Resistor
		ohm		Boards	Test
2T	9A	Less than	OK	None	Continue
		100 ohms
		Greater	Open	Replace 4	Snubber
		than 1K		Switch	Resistor
		ohm		Boards	Test
9A	2T	Greater	OK	None	Continue
		than 1K
		ohm
		Less than	Shorted	Replace 4	Snubber
		100 ohms		Switch	Resistor
				boards	Test

NOTE: K ohm = ohm reading multiplied by 1000.

NOTE: Always make sure that all four Switch Boards are changed at the same time. Never mix an old style (different part number) Switch Board with a new style (new part

number).

POWER WAVE 450