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| TROUBLESHOOTING & REPAIR |
DIODE MODULE REMOVAL AND REPLACEMENT(CONTINUED)
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3.Perform the Case Cover Removal proce- dure.
4.Perform the Power Capacitor Discharge procedure.
5.Carefully turn the machine onto its side.
6.Using the 3/8" wrench, remove the four screws holding the tunnel assembly to the machine base. Then carefully turn the machine back upright.
7.With the slot head screw driver, carefully raise the tunnel assembly unit about one inch and block it with the piece of wood. This will allow access to the bottom allen head screw on the diode module. Peel away the
8.Using the 7/16" wrench, remove the two outer screws, lock washers, and flat wash- ers holding the negative capacitor strap to the diode module. Note fastener order for reassembly.
9.Using the 3/16" allen head wrench, remove the two screws, flat washers, and spring washers holding the diode module to the heat sink.
10.Using the 9/64" allen wrench, remove the set screw from the center of the diode module.
11.Remove the diode module from the heat sink.
REPLACEMENT
Refer to Figure F.15.
CAUTION
The proper tightening sequence is required to mount the diode module to the heat sink in order to avoid warping the base plate. Apply the proper torque to all fasteners.
1.Be sure the heat sink mounting surface is clean, dry, and free of grease.
2.Apply a thin, even coat (.1 to .25mm or .004 to .010 in) of Penetrox A13 thermal joint compound to the diode module base plate only, under the plastic body of the module. Do not apply compound to the area under the mounting holes.
3.Press the module firmly against the heat sink, aligning the mounting holes.
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