Troubleshooting & repair, Caution – Lincoln Electric PRO-CUT 55 SVM140-A User Manual
Page 98
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.
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.
TROUBLESHOOTING & REPAIR
OUTPUT POWER BOARD REMOVAL & REPLACEMENT (continued)
F-61
F-61
PRO-CUT 55
CAUTION