Lincoln Electric SVM162-B service manual Protection Board Test, Resistance Between Reading

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F-26	TROUBLESHOOTING & REPAIR		F-26
1.	PROTECTION BOARD TEST (continued)
	Using a 3/8” nut driver, remove the case top	3. Unplug P5 from the control board. Measure
2.	and sides.	resistance at P5. See Figure F3. See tables
	Check that P5 is connected to J5, not J5A.	below.
	See the Wiring Diagram.

		Table F.1
		RESISTANCE BETWEEN			READING
TRIGGER		Pins 5 & 7		Open when trigger open, short when trigger closed.
B-C		Pins 3 & 4		Increasing from 0 to 10K when working on remote
				amptrol from min. to max.
B-A		Pins 2 & 3		Decreasing from 10K to 0 when working on remote
				amptrol from min. to max.
4.	If the readings	above are OK, the protection		7. If readings below are OK, protection board
5.	board is OK. If not, go to step 5.			is bad.
	Unplug P23 from the protection board and		8. If readings below are wrong, remote amptrol
	check continuity from P23 to P5. If OK, go			or remote receptacle is bad.
6.	to step 6. See Wiring Diagram.
	Unplug P22 from protection board. Measure
	resistance at P22. See Tables.

	Table F.2
	RESISTANCE BETWEEN		READING
TRIGGER	Pins 3 & 6	Open when trigger open, short when trigger closed.
B-C	Pins 1 & 2	Increasing from 0 to 10K when working on remote
		amptrol from min. to max.
B-A	Pins 1 & 4	Decreasing from 10K to 0 when working on remote
		amptrol from min. to max.

FIGURE F.3 – Plug J5 (viewed from pin end)

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Jumper

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PRECISION TIG 275