TM 115826225-35
n. Replacement of Power Supply and Servo
(5) Tighten all screws on subassemblies in
Compartment.
(1) abet'e, except for gear train sub-
assembly. Tighten screws which are in
(1) Replace gear train subassembly (c
above) before replacing power supply
depressed area on left side of receiver
and servo compartment ( fig. 32).
remaining screw.
(2) Replace four screws (A, fig. 3-1, lock).
(6) Secure RF shield to left side of re-
o. Replacement of Dust Cover.
ceiver with three screws and three
(1) Slide dust cover over receiver chassis,
(2) Tighten two screws (fig, 2-1) at front
(7) Rotate switch shaft manually. Switch
of receiver and one screw at rear.
s h a f t should rotate smoothly and
easily, and switch wafers should not
35. Disassembly of Control Unit
b i n d . If necessary, loosen screws
Note. Refer to figure 517 throughout the disassembly
which secure subassemblies, reposi-
of the control unit.
tion subassemblies slightly, and re-
a. Removal of Front Panel.
tighten screws.
(1) Loosen four setscrews (96 and 101),
(8) Remove RF shield ((6) above).
a n d remove TUNE knob (97) and
(9) Insert end of switch shaft into switch
GAIN knob (102) from their shafts.
shaft coupler (fig. 31) on gear train
(2) Loosen four setscrews (98, 100, and
subassembly.
104) and remove knobs (94, 99, and
(10) Rotate switch shaft so that flats of
105).
switch shaft are aligned with flats of
(3) Remove two screws (108).
shaft of spur gear assembly (77, fig.
(4) Remove two screws (106) and two
516). Align flats of shafts so that
rubber washers (107).
notches in switch wafers of subassem-
(5) Remove front panel (93) from the
blies in (1) above are also aligned.
control unit.
This includes wafer switches S1-K,
(6) Loosen two Dzus fasteners (1) located
S1-L, and S1M (28, 24, 23) in gear
o n rear cover (2), and slide rear
train subassembly. The tighten two
cover (2) off the control unit,
setscrews (119, lock) on switch shaft
(7) Slide the panel light assembly (92)
coupler (118) which secure switch
away from front subpanel assembly
shaft. One of setscrew-s (119) should
(88) far enough to permit unsoldering
seat on one of flats of switch shaft.
of the two panel lamp leads. Unsolder
(11) Rotate switch shaft so that switch
and tag these leads,
wafers are positioned as shown in
(8) Remove the panel light assembly (92)
schematic diagram of receiver (fig.
from the control unit.
5-l0).
(12) Lubricate rotors of all switch wafers
(9) Remove four screws (112), and four
lockwashers (112).
with the following mixture. Apply
lubricant with a small camel's-hair
( l o ) Remove nut (114) and lockwasher
brush, and remove all excess with a
(115) securing toggle switch (133)
clean, lint free cloth.
to front subpanel assembly (88).
(a) 25 parts by weight of grease, Rylson
(11) Slide the front subpanel assembly
No. 2 E.P.
(88) away from frame (136) far
(b) 75 parts by weight of Stanisol sol-
enough to permit unsoldering the leads
vent.
(13) Replace RF shield ((6) above).
these leads.
(12) Remove front subpanel assembly (88)
(14) Replace switch shaft cover (fig. 2-1)
on front panel of receiver,
from the control unit.
3-11
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