Lincoln Electric SVM114-C 28TROUBLESHOOTING and Repair F-28, Contactor PC Board Test, 667

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F-28TROUBLESHOOTING AND REPAIR F-28

CONTACTOR & CONTACTOR PC BOARD TEST (continued)

FIGURE F.15. CONTROL BOARD

667 555 691

621

J1 J3 J4 J2

500 512 690

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CONTACTOR PC BOARD TEST

1. Check to be sure plug J9, on contactor board and plug J3, on the control board are present and secure. See Figures F.14 and F.15.

2. If optional gas timer pc board is installed, remove plug J6 from contactor board and install jumper plug. See Wiring Diagram.

3. Apply at least 25VDC but no more than 100VDC to the LN-25™ from the electrode cable to the work sensing lead. Observe polarity and set polarity switch.

4. Check for the applied voltage at plug J9 pins 1 & 2 (lead 667+ and 621-). See Figure F.14.

5.With the trigger activated, and a normally operating contactor connected, the voltage measured at the contactor leads J9 pins 13 & 14 is approximately 1.0 VDC. See

See the Wiring Diagram. If the 1.0FigureVDC isF.not14. present when the trigger is activated, the contactor board may be faulty.

6.Be sure to reconnect all plugs previously removed.

If the original Control Board has been

Note: replaced with L12253-[ ],and follow instructions for thatSeeControlFigureBoardF.16

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LN-25™