Lincoln Electric DC-655 service manual Figure F.4

F-21 F-21

TROUBLESHOOTING & REPAIR

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12.Test for 9.5 VDC to 11.0 VDC between leads #231 and #215 on the firing board.

Make sure the Mode Switch (SW2) is in a constant voltage (CV) position.

Locate plug J5 on the firing board. Locate leads #231 (pin-13) and #215 (pin-12). See

Figure F.4.

Connect a jumper wire from pin C (lead #2) to pin D (lead #4) at the 14-pin receptacle. (Or put the Output Terminal Switch in the ON position.) This should initiate machine output at the welding terminals.

Rotate the Output Control (R1) clockwise and counter-clockwise. The DC voltage between leads #231 and #215 should vary from 9.5 VDC to 11.0 VDC as the control is turned from minimum to maximum. If the voltage varies and LEDs 1 through 6 do NOT vary in brightness, the firing board may be faulty.

If the voltage does NOT vary, the control board, control potentiometer or associated leads may be faulty. See the Wiring Diagram.

13.Test for approximately 5.5 VDC between leads #231 and #215 on the firing board. See Figure F.4.

Put the Mode Switch (SW2) in the constant current (CC) position.

Rotate the Output Control (R1) clockwise and counter-clockwise. The DC voltage between leads #231 and #215 should be constant at approximately 5.5 VDC. This voltage should not vary when the output control is turned.

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IDEALARC DC-655