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| TROUBLESHOOTING & REPAIR |
OUTPUT RECTIFIER, STT CHOPPER BOARD AND RECTIFIER MODULE
REMOVAL AND REPLACEMENT (CONTINUED)
RECTIFIER MODULE REMOVAL AND | RECTIFIER ASSEMBLY REPLACE- |
REPLACEMENT PROCEDURE | MENT PROCEDURE |
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1.Using the 9/64” allen wrench, remove the cap screw from the center of the rectifier module that is to be replaced.
2.Using the 7/16” 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 con- siderations to prevent warping of the base plate. The heat sink surfaces must be clean and flat. Apply a thin, even coating of ther- mal 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 heat sink while aligning the mounting holes. Start all three screws two to three turns by hand.
6.Tighten each of the outer screws to between 5 and 10
7.Tighten the center screw to between 12 and 18
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 wash- ers to the mounting bolts.
3.Using the 7/16” wrench, tighten the four nuts on the mounting bolts.
4.Replace leads #292 and #291 to the ther- mostat.
5.Connect plug J10 to the STT Chopper Board.
6.With the 7/16” wrench, attach lead #287 from the STT Snubber Diode D5.
7.With the 7/16” wrench, attach lead #289B from the STT Snubber Capacitor C10.
8.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.
9.Apply a thin coat of Penetrox A13 to the heat sink where the Power Wave positive output lead and the STT output lead attach.
10.Attach the Power Wave positive output lead to the heat sink using the 9/16” wrench.
11.Attach the STT output lead to the heat sink using the 7/16” wrench.
12.Install the case top and sides using the 3/8” nut driver.
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