Lincoln Electric SVM175-A 76TROUBLESHOOTING & REPAIRF-76, Cover Replacement procedure

TOC

TOC

F-76TROUBLESHOOTING & REPAIRF-76

CONTROL POTENTIOMETER AND MODE SWITCH RESISTANCE TEST

to Section

to Master

TEST PROCEDURE

(continued)

Return

Return to Section TOC

Return to Section TOC

Return

Return to Master TOC

Return to Master TOC

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 con- tact pins. P7 will remain unplugged for fol- lowing test.

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

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

6.The resistance should be very high. A read- ing of 500,000 (500k) ohms or higher is acceptable.

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

Return to Section TOC

Return to Master TOC

RANGER 305D