TOC

F-76

TROUBLESHOOTING & REPAIR

F-76

 

CONTROL POTENTIOMETER AND MODE SWITCH RESISTANCE TEST

(CONTINUED)

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TEST PROCEDURE

1.Turn the engine off

2.Perform the Case cover Removal Procedure.

3.Unplug P7 from control board, see control Inner-connection diagram, and visually check the plug and attached wiring for damage, cor- rosion, improperly seated or damaged contact pins. P7 will remain unplugged for following test.

4.Set the mode switch in the “CC-Stick” position.

5.Test the resistance between each of the leads in P7 and a good clean chassis ground con- nection. Be very careful that the connection pins in P7 are not damaged or spread out.

6.The resistance should be very high. A reading of 500,000 (500k) ohms or higher is accept- able.

7.If the resistance is lower than 500k Ohms, replace the potentiometer and mode switch plug and lead assembly, or replace the defec- tive component within the assembly. See wiring diagram.

8.Perform the resistance tests per Table F.3.

9.If the resistance readings are not as specified in the table, replace the potentiometer and mode switch plug and lead assembly, or replace the defective component. See the wiring diagram.

10.If testing is complete, plug P7 back into the control PC board and perform the Case Cover Replacement procedure.

VANTAGE® 400

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Lincoln Electric 400 service manual Test Procedure

400 specifications

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