Lincoln Electric SVM159-A service manual Allen Bolts

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F-53 TROUBLESHOOTING & REPAIR F-53

MAIN SWITCH BOARD REMOVAL & REPLACEMENT (continued)

FIGURE F.22 – 3/16” ALLEN BOLT LOCATION

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3/16" ALLEN BOLTS

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9.Using a 3/16” allen wrench remove four allen bolts and washers as shown in Figure F.22. At this point, the board is ready for removal.

10.Carefully maneuver the board out of the machine.

11.Apply a thin coat of Penetrox A-13 to the IGBT heatsinks on the back of the new switch boards mating surfaces. Note: Keep compound away from the mounting holes.

12.Replace the four allen bolts and washers previously removed.

13.Replace the eight capacitor terminal nuts, washers, and necessary leads previously removed.

14.Reconnect the three harness plugs previous- ly removed.

15.Reconnect the nine leads (#201-#209) that were previously removed.

16.Replace any necessary cable ties previously removed.

17.Pre-torque all screws to 25 inch lbs. before tightening to 44 inch lbs.

18.Replace the input lead shield previously removed.

19.Replace the case wraparound cover.

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POWER WAVE 355/405