Lincoln Electric SVM140-A Capacitor Removal, Capacitor Replacement and P.C. Board Replacement

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F-65 F-65

TROUBLESHOOTING & REPAIR

PRIMARY POWER BOARD AND FILTER CAPACITOR

REMOVAL AND REPLACEMENT (continued)

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CAPACITOR REMOVAL

1.Using the 3/8” wrench, remove the four screws holding the heat sink assembly to the upper and bottom sections of the machine. See Figure F.24.

2.Remove the gas hose restraints from the bot- tom of the heat sink assembly.

3.Remove the two thermostat leads from the thermostat, which is located next to the upper capacitor.

4.Carefully remove the heat sink and capacitor assembly. Clear any necessary leads.

5.Remove the faulty capacitors by using the slot head screw driver to loosen the clamps. Take note of capacitor position in the clamp.

Observe polarity markings and terminal position.

CAPACITOR REPLACEMENT AND P.C. BOARD REPLACEMENT

1.Replace the capacitors by positioning them in the clamps. Do not tighten the clamps. They must be loose when the P.C. board is assembled to the capacitors.

2.Apply a thin coating of Penetrox A-13 Electrical Joint Compound to the mating sur- faces of the P.C. board and the heat sink and capacitor terminals.

3.Mount the P.C. board to the heat sink and capacitor assembly. Make sure the capacitor terminals line up with the holes in the P.C. board and with the correct capacitor polari- ties.

4.Assemble the four socket head screws and pre-torque them to 25 inch-pounds.

5.Make certain the capacitors are lined up correctly so that when the capacitor bolts are assembled through the P.C. board, there will NOT be any distortion to the P.C. board.

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

7.Assemble the two slot head screws with their appropriate insulators.

8.Tighten the capacitor clamps.

9.Place the assembly into the machine and connect the two thermostat leads previous- ly removed.

10.Secure the assembly to the upper and bot- tom sections of the unit using the 3/8” wrench and the four screws previously removed.

11.Connect the J10 plug.

12.Connect leads 201, 204, 205, 208 and 209 previously removed.

13.Connect leads 202A, 207A, 206, and 203A to the capacitor terminals. Torque to 50-60 inch-pounds.

14.Replace the gas hose restraints previously removed.

15.Clear and reposition any leads that may be disturbed.

16.Replace the case wraparound cover.

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PRO-CUT 55