Lincoln Electric SVM104-A service manual Return to Return to Section TOC

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Master TOC

F-19 TROUBLESHOOTING & REPAIR

TORCH, TORCH CABLE ASSEMBLY, INTERNAL TRIGGER,

AND SAFETY CIRCUIT TEST

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8.Disconnect Plug J5 from its header on the Control Board.

9.Test for zero ohms (continuity) from the following test points on Plug J5 header to the 4-pin leads on the bulkhead of the machine (See Figure F.7):

-Pin 4J5 (lead #4) to 4-pin pin #4

-Pin 3J5 (lead #2) to 4-pin pin #2

-Pin 6J5 (lead #336) to 4-pin pin #1

-Pin 8J5 (lead #337) to 4-pin pin #3

a.If any of the above tests do not agree with the expected nor mal resistance specifications, then Plug J5 on the Control Board, the torch 4-pin receptacle, or the a s s o c i a t e d wiring must be repaired.

b.If all of the above tests are within the normal resistance specifications, continue with test procedure.

10.Re-connect Plug J5 back into its header.

11.Test for 24 VAC between Pin 5J5 (lead C1) and Pin 7J5 (lead # 335) on Plug J5.

a.Carefully insert the volt/ohm (Multimeter) probes into the back of the J5 plug into pin cavity 5J5 (lead C1) and pin cavity 7J5 (lead #335). See Figure F.1.

b. Connect input power to PRO-CUT 60.

c.Turn ON/OFF Power Switch to ON.

d.Read meter.

- If 24 VAC is NOT present, continue with test procedure.

12.Turn ON/OFF Power Switch to OFF.

13.Disconnect main input power to machine.

14.Perform the CAPACITOR DISCHARGE PROCEDURE.

15.Check Plug J10 and Plug J5 and associated wiring for loose or faulty connections.

16.Disconnect Plug J10 from Header J10.

17.Test for continuity (zero ohms) between 3J10 and 6J10 on Control Board Header J10.

a.If continuity is not indicated, the Control Board could be faulty.

18.Perform MAIN TRANSFORMER TEST.

19.Replace the Control Board if all of the above tests are within normal specifications.

PRO-CUT 60