Lincoln Electric SVM153-A service manual Power Module PC Board Replacement

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F-68	F-68
	TROUBLESHOOTING & REPAIR

POWER MODULE (CHOPPER) PC BOARD/DIODE

MODULE REMOVAL AND REPLACEMENT (CONTINUED)

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POWER MODULE PC BOARD REPLACEMENT

1.Apply Penetrox A-13 joint compound (T12837-1) to the surface of the heat sink where the Power Module PC board mounts.

2.Install the top and bottom allen head cap screws. Insert the bolts into the board before mounting it. Torque the screws to 50- 60 inch-pounds.

IMPORTANT: Each top cap screw has a copper standoff on the opposite side of the board. Be sure to place this standoff between the heat sink and the PC board.

3.Install the positive capacitor straps, flat washers, lock washers, and nuts. Torque the nuts to 50-60 inch-pounds at the Power Module PC board and at the capacitor termi- nals.

4.Install the small diode leads and the heavy leads, flat washers, lock washers, and nuts to the Power Module PC board. Torque the nuts to 50-60 inch-pounds.

5.Install plug and lead assembly P/J50 (right side) or P/J51 (left side).

6.Replace any cable ties cut at disassembly.

See the procedures below for removal and replacement of the Power Module PC board diode module. When procedures are complete, perform the Output Panel Replacement and the Case Cover Replacement Procedures.

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COMMANDER 500