4-50. REPAIR INSTRUCTIONS. Continued
Inspect mounting adapter. Replace mounting
damaged, such as with a broken connector.
adapter chassis if the mounting adapter is physically
d. Mounting adapter must be tested after replacement of a module.
Static electricity and stray voltages can damage the mounting adapter. Use an antistatic pad on
the work surface and wear a grounded wrist strap when repairing the mounting adapter.
All circuit card assemblies in the mounting adapter contain static sensitive devices susceptible to
electrostatic damage. DO NOT attempt to replace components without using protective
Steps marked with must be performed exactly as written. They are critical in maintaining
the nuclear hardness of the mounting adapter. Seals must not be damaged. All screws must be
torqued to the limits specified in the replacement procedures.
4-51. REPLACEMENT OF POWER SUPPLY (5A1).
Cross tip screwdriver
Flat tip screwdriver
a. Mounting adapter
b. 20 captive screws (8)
c. Screw (9) and
d. Screw (10)
e. Heatsink assembly (11)
f. Terminal block TB1 screws
and wires (12)
g. Eight captive screws (14)
h. Power supply (13)
Set on work surface with back toward
Using flat tip screwdriver, fully loosen 20
See figure 4-140
captive screws securing heatsink assem-
bly (11) to power supply cover (17).
Using cross tip screwdriver, remove and
retain screw (9) and flat washer securing
heatsink assembly (11) to audio amplifier
Using flat tip screwdriver, remove and retain
screw (10) securing heatsink assembly (11)
to audio amplifier chassis (3).
Lay heatsink assembly on its fins.
Carefully lay on fins to ensure
casting does not rest on
components inside power
Using flat tip screwdriver, tag, remove and
retain six screws securing six wires (12) to
terminal block TB1 on heatsink assembly.
Using flat tip screwdriver, fully loosen
eight captive screws (14) securing power
supply (13) to heatsink assembly.
Remove and send to general support for