Lincoln Electric V250-S service manual Troubleshooting & Repair

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F-63 TROUBLESHOOTING & REPAIR F-63

OUTPUT DIODE ASSEMBLY REMOVAL AND REPLACEMENT

(MACHINE CODES ABOVE 10150)

(continued)

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6.Using 7/16” wrench remove the top and bottom mounting bolts and associated washers from the diode module to be replaced.

7.Using 1/8” Allen wrench remove the center socket head cap screw from the diode module to be replaced.

8.Carefully remove the diode module.

9.To install the new module first make sure the heat sink surface is clean and free of dirt.

10.Apply a thin even coating (.004 to

.010 IN.) of thermal compound Penetrox A13 (Lincoln E2529) to the bottom surface of the base plate. Keep the compound away from the mounting hole areas.

11.Apply a small amount of Loctite #271 (Lincoln E1777-1) to the first three threads of the socket head cap screw.

12.Start threading the top and bottom screws and associated washers by hand. Also start the center socket head cap screw and associated washer.

13.Run the center cap screw in by hand until it makes contact with the surface of the module. Do not torque down yet!

14.Tighten the top and bottom screws to between 5.0 and 10.0 IN-LBS.

15.Tighten the center cap screw to between 12 and 18 IN-LBS.

16.Further tighten the top and bottom screws to between 30 and 40 IN-LBS.

17.Connect the leads to the proper ter- minals and tighten the screws to between 30 to 40 IN-LBS. Do not stress the module terminals when making these connections.

18.Clear all leads and prepare unit for reassembly of wrap-around case.

INVERTEC V250-S