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TM 11-5820-890-30-5
4-50.
c.
d.
4-51.
Tools:
REPAIR INSTRUCTIONS. Continued
Inspect mounting adapter. Replace mounting adapter chassis if the mounting adapter is physically
damaged, such as with a broken connector.
Mounting adapter must be tested after replacement of a module.
CAUTION
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
devices.
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.
REPLACEMENT OF POWER SUPPLY (5A1).
Cross tip screwdriver
Flat tip screwdriver
Torque screwdriver
ITEM
ACTION
REMARKS
REMOVAL
a. Mounting adapter
b. 20 captive screws (8)
c. Screw (9) and
flat washer
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
you.
Using flat tip screwdriver, fully loosen 20
See figure 4-14.
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
chassis (3).
Using flat tip screwdriver, remove and retain
screw (10) securing heatsink assembly (11)
to audio amplifier chassis (3).
Lay heatsink assembly on its fins.
CAUTION
Carefully lay on fins to ensure
casting does not rest on
components inside power
supply cover.
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
repair.
4-156
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