Lincoln Electric SVM172-A service manual Test Procedure

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F-18 TROUBLESHOOTING & REPAIR F-18

VOLTAGE SENSE PC BOARD TEST (continued)

FIGURE F.1 – VOLTAGE SENSING BOARD TEST

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2 3 J2

J1

4 5

2	NOTE: Inspect the molex plug con-
	nector pins on the Voltage Sense
	Board. If any of them are gold plat-
	ed the P.C. board should be
	replaced.

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TEST PROCEDURE

1.Remove input power from the wire feed unit.

2.Using the 3/8 in. nut driver, remove the cover from the wire feeder.

3.Locate the voltage sense PC board and plugs J1 and J2. Do not remove the plugs from the voltage sense pc board. Refer to Figure F.1.

4.Apply the correct input power (from the Power Wave 455 control cable) to the wire feeder. With the gun trigger activat- ed, check for approximately 12 VDC at plug J1 pin 1 (+) to pin 4 (-). If the 12 VDC is NOT present, the feedhead board may be faulty. Also check for loose or faulty wires and connections between the feedhead board (plug J85 and plug J1 on the voltage sense PC board.

5.With the gun trigger activated and arc voltage present at the conductor block, check for arc voltage from plug J1 pin 3 (lead 67) to the workpiece. If actual arc voltage is NOT present, check the conti- nuity of lead 67 from the conductor block to plug J1 pin 3 on the voltage sense PC board.

6.If the actual arc voltage IS present at plug J1 pin 3 (lead 67), then check for arc voltage from plug J2 pin 2 (lead 67B) to the workpiece. See wiring diagram.

7.If the 12 VDC IS present in step #4 and the arc voltage IS present in step #5 but the arc voltage is NOT present in step #6 (lead 67A), the voltage sense PC board may be faulty.

8.Remove all input power from the wire feeder unit.

9.Install the wire feeder cover with the 3/8 in. nut driver.

POWER FEED 10M SINGLE/DUAL