Lincoln Electric SVM104-A service manual Figure F.4 Torch and Cable Resistance Test Points

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F-17 TROUBLESHOOTING & REPAIR

TORCH, TORCH CABLE ASSEMBLY, INTERNAL TRIGGER,

AND SAFETY CIRCUIT TEST

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d. Disconnect the trigger lead 4-pin connector by unscrewing it.

e. Disconnect the electrode lead using a 9/16” open-end wrench to remove the brass adaptor fit- ting attached to the bulkhead connector.

f.Disconnect the pilot lead by removing the wing nut marked PILOT. Remove only the pilot lead. Do not remove any of the leads below the brass nut.

g.Rotate and lift the torch

cable strain relief clamp to remove it from the bolt head. Do not remove the strain relief clamp from around the three leads.

h.Pull the trigger lead, electrode lead, and pilot lead bundled in the strain relief clamp out of the machine through the rubber boot.

5.Move the torch cable assembly to a convenient work area.

6.Perform the following resistance tests using a volt/ohm meter (Multimeter). See Figures F.4. and F.5 for Torch and Cable Resistance Tests Points and Circuit Diagram.

a.Test for resistance on 4-pin connector of 1 ohm or less (continuity) from:

-pins #1 to #3.

-pin #3 to the pilot lead.

-pilot lead to the torch nozzle.

-pins #2 to #4 when the torch trigger is pulled.

NOTE: Remove the torch nozzle with the supplied wrench to per- form this test.

-electrode lead to the torch electrode.

b.Test for high resistance (500K ohm minimum) from the pilot lead to the electrode lead.

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			SHIELD CUP
			ASSEMBLY
		TRIGGER	NOZZLE
		4- PIN CONNECTOR	ELECTRODE
1	3		ASSEMBLY
		(END VIEW)
2	4
			4 - PIN CONNECTOR

ELECTRODE LEAD

PILOT LEAD

FIGURE F.4 - Torch and Cable Resistance Test Points

PRO-CUT 60