Lincoln Electric SVM145-B service manual Control Input Test

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F-65			F-65
	TROUBLESHOOTING & REPAIR
	CONTROL INPUT TEST (continued)
		Table F.2.
	CONTROL DIAL POSITION	RANGE SEL. SWITCH POS.	VOLTAGE
	MIN	CV	1.223-1.299 VDC
	MIN	60A	.553-.587 VDC
	MIN	90A	.844-.896 VDC
	MIN	150A	1.162-1.234 VDC
	MIN	230A	1.524-1.618 VDC
	MIN	300A	1.868-1.984 VDC
	MIN	CC	.319-.339 VDC
	MAX	CV	4.799-5.095 VDC
	MAX	60A	1.085-1.153 VDC
	MAX	90A	1.660-1.762 VDC
	MAX	150A	2.285-2.427 VDC
	MAX	230A	2.998-3.184 VDC
	MAX	300A	3.669-3.895 VDC
	MAX	CC	3.870-4.110 VDC

14.Using an ohmmeter, measure continuity at J4 in the following switch positions. See Table F.3 below.

	Table F.3.
RANGE SEL. SWITCH POSITION	CONTINUITY FROM
CV	J4 pin 1 to 9
60A	J4 pin 1 to 6
90A	J4 pin 1 to 2
150A	J4 pin 1 to 5
230A	J4 pin 1 to 7
300A	J4 pin 1 to 8
CC	J4 pin 1 to 10

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15.If continuity fails or is intermittent in any of the above switch positions, check for continuity and poor connections on all leads from the switch back to the control board. Check for loose or faulty connections in molex connec- tors.

16.Plug J4 back into the control PC board.

17.Locate and disconnect J3 at the control PC board. See Figure F.30.

18.Set the control dial to the minimum position, set the Arc Force dial to the minimum posi- tion, and set the Local/Remote switch in the “Local” position.

19.Using an ohmmeter, measure 10K from J3 pin 7 to J3 pin 8.

20.Using an ohmmeter, measure the resistance from J3 pin 7 to J3 pin 16. See Figure F.31. The resistance on the ohmmeter should increase from 0 ohms to 10K uniformly as the control dial is turned clockwise from minimum to maximum.

21.If the resistance check in step 19 & 20 fails, check for continuity and poor connections on all 75, 76, and 77 leads from the potentiome- ter back to the control board. See the Wiring Diagram. Look closely for broken molex pins.

22.Check the Local/Remote switch for continuity.

23.If all the leads and the Local/Remote switch check ok, the control potentiometer is bad. Replace.

COMMANDER 300