TM
11-5835-243-34/EE641-AA-MMl-010/E154
MTT/TO
31S3-4-110-1
3-34. Front Panel Controls and Indicators
(4) Remove magnetic head assembly PU1 (para
(5) Remove line filter FL1 (para 3-26).
a. Removal.
(6) Remove interface connector J2 (25) from
(1) Remove six socket-head screws (2) securing
rear of chassis by removing four screws (26),
front panel assembly (3) to chassis.
washers (24) and nuts (23).
(2) Carefully lay front panel assembly down flat
(7) Remove tape deck assembly A8 (para 3-32).
to expose rear side.
(8) Tag and unsolder harness wiring from
(3) Tag and unsolder leads from components
phototransistor assemblies (A8A1, A8A2, A8A4)
being removed.
LED assemblies (A8A3, A8A5) and interlock
(4) Remove component from panel as follows:
switches (A8S1, A8S2).
(a) LED socket is removed by unscrewing nut
(9) Unsolder harness wiring (32) from front
securing socket to panel.
panel components.
(b) RWND, POWER, DOOR switches and
(10) Remove six flat head screws securing
ON/OFF circuit breaker are removed by unscrewing
harness and interface board assembly (33) to chassis
nut on front side of panel. When removing RWND
(1) and lift out assembly.
switch, first remove white plastic knob by pulling it
b. Replacement.
straight forward.
(c) ADDRESS switch is removed by first
NOTE
unscrewing set screw in knob and then removing
The destination for all harness wiring is
nut.
hot stamped on wire markers. If in doubt,
(d) Elapsed time meter is removed by un-
use interconnecting wiring diagrams and
screwing two hex screws on rear of panel.
signal interconnection list (figs. FO-7,
b. Replacement.
(1) Place component in panel assembly.
routing and dressing details.
(2) Secure component to panel as follows:
(1) Solder harness wiring to all front panel
(a) LED socket is secured by nut on rear of
components.
panel.
(2) Solder harness wiring to phototransistor
(b) RWND, POWER, DOOR switches and
assemblies (A8A1, A8A2, A8A4), LED assemblies
ON/OFF circuit breaker are secured by nut on front
(A8A3, A8A5) and interlock switches (A8S1, A8S2).
side of panel. Push white plastic knob of RWND
(3) Position harness and interface board (33) in
onto switch shaft after securing nut.
chassis and secure in place with six flat head screws.
(c) ADDRESS switch is secured by nut on
(4) Orient interface connector J2 (25) with wide
front side of panel. Replace knob on shaft and secure
key slot at top and secure connector to rear of
it with set screw.
chassis using four screws (26), washers (24) and nuts
(d) Elapsed time meter is secured with two
(23). Be sure that chassis ground lead to line filter
hex screws on rear side of panel.
FL1 is attached to connector screw.
(3) Solder leads to component.
(5) Secure line filter FL1 to chassis (para 3-26).
(4) Secure front panel assembly (3) to frame
(6) Secure connector A10P1 to the power
with six socket head screws (2).
supply by means of connector jackscrews. Alter-
nately tighten each screw one to two turns until
3-35. Motor and Tachometer Commutator
connector is seated.
Cleaning
(7) Install tape deck assembly A8 in chassis
a. Motor Commutator.
(8) Secure front panel assembly to chassis with
six socket-head screws.
(1) Remove capstan motor assembly (para
(9) Replace magnetic head assembly PU1 (para
(2) Remove five screws (two pan head, three flat
(10) Replace capstan motor assembly B1 (para
head) securing front cap to motor housing.
CAUTION
(11) Replace power amplifier assembly A9 (para
Hold down the capstan when removing
from housing cap of motor assembly. This
(12) Replace circuit card assemblies Al through
will prevent armature from being pulled
A5 (para 3-24).
3-25
