Lincoln Electric SVM158-A service manual Depress Locking TAB on Mounting PIN

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F-61 F-61

TROUBLESHOOTING & REPAIR

MAIN SWITCH BOARD REMOVAL & REPLACEMENT (continued)

FIGURE F.23. – 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.23. At this point, the board is ready for removal. Carefully remove the board from the 4 nylon mounting pins. Note: Depress the retaining pins on the sides of the nylon mounts to release the board. See Figure F.24.

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.Mount the new board on the nylon mount - ing pins.

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

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

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

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

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

18.Replace the case wraparound cover.

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FIGURE F.24. – NYLON MOUNTING PIN

DEPRESS

LOCKING TAB ON

MOUNTING PIN

V350-PRO