Lincoln Electric SVM127-A service manual Return Return to Section TOC

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F-36 F-36

TROUBLESHOOTING & REPAIR

VOLTMETER ACCURACY TEST (continued)

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WARNING

ELECTRIC SHOCK can kill.

•With power applied, there are high voltages inside the wire feeder. Do not reach into the wire feeder or touch any internal part of the wire feeder while power is applied.

3.With the LN-9 gun trigger closed or the gun terminals jumpered together (see the Wiring Diagram), the test meter reading should match the LN-9 ACTUAL volts reading within +/- 0.5 volts. If it does not, check the integri- ty and placement of the voltage sensing leads #21 and #67. Perform the Meter Circuit

Accuracy Test.

4.Remove the test voltmeter and, while weld- ing, compare the SET volts and ACTUAL volts meter readings. Depending upon the arc volt- age characteristics of the welding process being used, the ACTUAL reading may vary somewhat around an average value. The average ACTUAL reading should match the SET reading within +/- 0.5 volts. If not, refer to the Meter Circuit Accuracy Test.

5.If no further tests are required, remove the jumper from the gun terminals (if used) and close the left case side cover assembly.

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LN-9 Wire Feeder