Lincoln Electric SVM151-A Reassembly, Perform the Case Cover Assembly Replacement procedure

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F-53	F-53
	TROUBLESHOOTING & REPAIR

POWER CAPACITOR REMOVAL AND REPLACEMENT (CONTINUED)

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7.Using the slot head screw driver, remove the two screws and lock washers from the tunnel assembly top cover. Then remove the four screws, lock washers, and flat washers that mount the Analog Control Power Supply PC Board. This will allow you to access the clamps that hold the capacitors to their brackets in the heat sinks.

8.Lift off the top cover of the tunnel assem- bly. Peel away the adhesive-backed rub- ber stripping (if present) as necessary. Use care – the stripping may tear.

9.Using the slot head screw driver, loosen the clamp from around the bracket of the capacitor you want to remove.

10.Using the 7/16" wrench, remove heavy leads #X1, #X4 and small leads #401 and 401A (left side) or #X1A and #X4A (right side) of the capacitor terminals. Note the fasteners for reassembly: bolt, lock wash- er, and flat washer. See the Wiring Diagram.

11.Using the 7/16" wrench, remove the two bolts holding the negative strap to the diode module. Note the fasteners for reassembly: bolt, lock washer, two flat washers.

12.Using the 7/16" wrench, remove the two nuts holding the positive strap to the Chopper PC board. Hold the bolt head behind the board to remove each nut. Note the fasteners for reassembly: flat washer, lock washer, nut. Note the place- ment of the reverse diode lead on the bot- tom bolt.

13.Push the capacitor from the inside, out of the heat sink. Note that the bracket stays in the heat sink.

REASSEMBLY

1.Slide the capacitor into the heat sink.

Position the positive (+) terminal next to the Chopper PC board.

2.Tighten the bracket clamp.

3.Replace the leads and straps as labeled (Figure F.13) and tighten the fasteners. Use the 7/16" socket and torque wrench to tighten the capacitor terminal bolt to 50-60 in-lbs. Tighten the nuts holding the positive strap to the Chopper PC board to 50-60 in- lbs.

4.Tighten the two 7/16" screws that hold the negative strap to the diode module to 30-40 in-lbs.

5.Replace any adhesive-backed rubber strip- ping, if present, that was damaged during disassembly.

6.Replace the Analog Control Power Supply PC Board.

7.Replace the tunnel assembly top cover.

8.Connect the wire harness plug assemblies above each Chopper PC Board and above the tunnel assembly (four plugs total).

9.Perform the Case Cover Assembly Replacement procedure.

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MULTI-WELD 350