TM 11-5835-243-34/EE641-AA-MMI-010/E154 MTT/TO 31S3-4-110-1
3-24. Circuit Card Assemblies A1 Through A5
(3) Install circuit cards A1 through A5 (para
Circuit card assemblies A1 through A5 (4, 5 and 6,
3-27. Power Amplifier Assembly (A9)
board assembly. To remove a card, proceed as
(22, fig. 3-7)
follows.
a. Removal.
a. Removal. Lift up built-in card ejectors and
(1) Remove flat head screw on connector
carefully ease card out of the slides using a side to
A8B1P1 (mates with A9J2, fig. 3-7) and remove
side rocking motion to free connector pins.
motor cable connector A8B1P1.
b. Replacement. Slide card into proper slot until
connector guide pins mate. Push card down firmly
CAUTION
Alternately turn connector jackscrews
into the connector.
one to two turns each until plug separates
3-25. Power Supply PS1
completely from jack.
(8, fig. 3-7)
(2) Remove cable clamp adjacent to connector
a. Removal.
A10P2.
(1) Remove circuit cards A1 through A5 (para
(3) Disconnect A10P2 from A9J1 by means of
jackscrews.
(2) Disconnect connector A 10P1 by backing out
(4) Remove mound strap) at Q6 by removing
jackscrews (gain access through two access holes in
screw (19), lockwasher (20) and washer (21).
bottom of chassis).
(5) Loosen three power amplifier captive
(3) Remove cable clamp adjacent to power
mounting screws.
supply assembly on the interface board.
(6) Remove power amplifier assembly (22) from
(4) Remove four mounting screws (7) and lift
tape transport.
out power supply.
b. Replacement.
b. Replacement.
(1) Position assembly power amplifier in tape
(1) Position power supply in chassis and secure
transport.
with four mounting screws. Place a drop of sealant
(2) Tighten three slot-head captive mounting
on screw threads before installing.
screws.
(2) Secure cable with cable clamp on interface
(3) Apply coat of zinc chromate primer,
board adjacent to power supply.
Specification TT-P-175, to washer (20), lockwasher
(3) secure connector A10P1 to PS1J1 (gain
(21), chassis strap terminal, and terminal contact
access through two access holes in bottom of
surface (fig. 3-8). Assemble with screw (19) while
chassis).
primer is still wet.
(4) Install circuit cards A1 through A5 (para
(4) Install cable clamp.
CAUTION
3-26. Line Filter FL1
Alternately tighten connector jackscrews
one to two turns each until connector is
(10, fig. 3-7)
securely seated.
a. Removal.
(5) Connect A10P2 to A9J1 and secure by
(1) Remove circuit cards A1 through A5 (para
means of jackscrews.
(6) Connect A8B1P1 to A9J2 and secure
(2) Disconnect connector A10P1 by backing out
jackscrews (gain access through two access holes in
connector with flat head screw. Place a drop of
bottom of chassis). Move cable out of the way.
sealant on screw threads before instilling.
(3) Remove four mounting screws (9), tag and
3-28. Power Amplifier Assembly (A9) Repair
disconnect electrical leads at terminal board on side
of filter and remove filter assembly.
a. Genenal. The replaceable components of the
b. Replacement
power amplifier assembly are the circuit card
(1) Position filter in chassis and secure elec-
tried leads to terminal board on filter. Secure filter
assembly, all resistors (R3, R5, R6, R9, R10, R11,
to back of chassis with four mounting screws. Place
R13) and transistors (Q1, Q2, Q3, Q5, Q6) mounted
a drop of sealant on screw threads.
on the assembly head sink plate.
(2) Secure connector A10P1 to PS1J1 (gain
access through two access holes in bottom of
chassis).
3-17
