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TROUBLESHOOTING AND REPAIR | |||
OUTPUT RECTIFIER AND MODULE REMOVAL AND REPLACEMENT (continued) | |||
| RECTIFIER MODULE REMOVAL | RECTIFIER ASSEMBLY |
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| AND REPLACEMENT | REPLACEMENT PROCEDURE | |
| PROCEDURE |
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1.Using the 9/64 in. Allen wrench, remove the cap screw from the center of the rectifier module that is to be replaced.
2.Using the 7/16 in. wrench, remove the two mounting bolts and associated washers from the rectifier module to be replaced.
3.Remove the faulty module.
4.This module requires special mounting considerations to prevent warping of the base plate. The heatsink surfaces must be clean and flat. Apply a thin, even coating of thermal compound, (Penetrox A13) 0.004 to 0.010 inches thick. Keep the compound away from the area of the mounting holes.
5.Press the new module firmly against the heatsink while aligning the mount- ing holes. Start all three screws two to three turns by hand.
6.Tighten each of the outer screws to between 5 and 10 in/lbs.
7.Tighten the center screw to between 12 and 18 in/lbs.
8.Tighten each of the outer screws again, this time to between 30 and 40 in/lbs.
1.Position the assembly in place with the mounting bolts.
2.Assemble the nuts and associated washers to the mounting bolts.
3.Using the 7/16 in. wrench, tighten the four nuts on the mounting bolts.
4.Replace leads #220 and #290 to the thermostat.
5.Connect the eight transformer leads to the correct rectifier modules. Tighten the screws (with two flat washers and one lock washer) to between 30 and 40 in/lbs. Do not stress the terminals when making these connections.
6.Apply a thin coat of Penetrox A13 to the heatsink where the positive output lead attaches.
7.Attach the positive output lead to the heatsink using the 9/16 in. wrench.
8.Install the case top and sides using the 3/8 in. nutdriver.
