Lincoln Electric SVM140-A service manual Replacement Procedure

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F-61 F-61

TROUBLESHOOTING & REPAIR

OUTPUT POWER BOARD REMOVAL & REPLACEMENT (continued)

REPLACEMENT PROCEDURE

1.Apply a thin coating of Penetrox A-13 Electrical Joint Compound to the mating sur- faces of the output power board and the heat sink. Make sure the surfaces are clean. Do not allow the compound to get into the threaded holes or on the screw threads.

CAUTION

Be sure to follow the recommended static-free methods for handling printed circuit boards. Failure to do so can result in permanent damage to the equipment.

2.Mount the output power board to the heat sink and pre-torque the four socket head screws to 25 inch-pounds.

3.Finish tightening the four screws to 40-48 inch-pounds.

4.Replace the two phillips head screws previ- ously removed.

5.Replace leads X20 and X40.

6.Replace all plugs previously removed.

7.Replace leads X4 and X2.

8.Replace lead B21 and torque it to 70 inch- pounds.

9.Clear and secure all leads and replace the wraparound cover.

PRO-CUT 55