Lincoln Electric SVM127-A service manual Lead Lead

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F-29 F-29

TROUBLESHOOTING & REPAIR

T2 TRANSFORMER TEST (continued)

FIGURE F.5 – T2 SECONDARY LEADS #621 AND #620 ON TRIGGER PC BOARD

LEAD LEAD

620 621

TRIGGER

PC BOARD

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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.

7.Insulate the T2 transformer primary leads #531 and #32A and apply 115 VAC power. See the Wiring Diagram and Figure F.4.

8.Using the volt/ohmmeter, check for approx- imately 24VAC at the T2 transformer sec- ondary leads #621 and #620. Place the probes where the leads connect on the trig- ger PC board. See Figure F.5.

9.With 115VAC applied to the primary leads #531 and #32A, if the secondary voltage is missing or low the T2 transformer may be faulty. Replace the T2 transformer.

10.After the test is completed, disconnect the 115VAC from the T2 transformer primary leads #531 and #32A. Reconnect lead #32 to the circuit breaker. Re-attach the Protection Circuit Troubleshooting name- plate. Close the right and left side cover assemblies and replace all previously removed screws.

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LN-9 Wire Feeder