Unsolder and remove component.
Use the orangewood stick to remove any burned conformal
coating residue from the area. Use care to avoid damage
to traces or pads.
Clean the area around the top and bottom component lead
pads with cotton swabs (item 16, App. D) and the cleaning
solution (item 14, App. D).
Insert the new component in the CCA and trim leads to the
Solder the new component in place.
(10) After soldering all leads, clean the connections with the
stiff brush (item 3, App. D) and cleaning solution (item
14, App. D).
(11) Retest the CCA to verify successful repair and proper
(12) Determine the type of conformal coating used on the
Test a small area away from components with
If the freon
freon TFE, TE, or TMS (item 14, App. D).
strips away from the coating, the coating is humiseal 1B31
(item 9, App. D); if it does not strip away, the coating
is humiseal 1A33 (item 9, App. D).
Humiseal 1A33 and 1B31 are not compatible.
conformal coating only with the type already present.
(13) Patch the conformal coating with the appropriate type of
humiseal in the test and repair areas.
(14) Refer to section V of this chapter.
Refer to figure 5-13 and
i. Voltage Regulator A1 Replacement.
proceed as follows:
Remove the four screws (17) and flat washers (18) that
secure the heat sink and voltage regulator (16) to the
chassis, then remove the heat sink and voltage regulator.
Disconnect connector A1P1 (67) from voltage regulator
(16) by unscrewing screws in screw lock assemblies (68).
Attach connector A1P1 (67) to voltage regulator A1 (16).
Aline voltage regulator A1 (16) with the mounting holes
and secure with the four screws (17) and flat washers