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Page Title:
Removal and Replacement of Frequency Selector |
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|  (2) If the shaft couplers have been dis-
turbed, align the five subunit tuning
Frequency Selector
shaft couplers with the frequency
selector couplers.
Replace the roundhead and the hex-
(3)
a. Removal.
(1) Before attempting to remove the
agonal-head screws (10) next to the
directional coupler in the lower
frequency selector, remove the
dynamotor or Centrifugal Fan HD-
right corner (top view). Do not
tighten.
390/U (para 114 or 115), the audio
Replace the hexagonal-head screw
amplifier and modulator subunit
(4)
(10, left-side view) on the rear of
(para 112), and the front panel
the frequency selector.
(2) Set the rt unit on its right side on
Replace the mounting plate for
(5)
the bench.
jacks J7, J9, and J10, and fasten it
(3) Remove the two roundhead screws
with two roundhead screws and
and lockwashers that fasten the
lockwashers (top view).
mounting plate (top view) to the fre-
Replace the three roundhead
(6)
quency selector frame.
screws (10) on the bottom of the
(4) Remove the three roundhead
main frame (bottom view).
screws (10) and lockwashers on the
Tighten all of the replaced screws.
(7)
bottom of the main frame (bottom
Replace the dynamotor or Centrif-
(8)
view).
ugal Fan HD-390/U (para 114 or
(5) Loosen the hexagonal-head screw
115), the audio amplifier and modu-
lator (para 112), and the front panel
(10, left-side view) on the rear of
the frequency selector.
(6) Disconnect plug P1201 (left-side
view).
(7) Pull the mounting plate for jacks
Blower Part of Receiver-Transmitter
J7, J9, and J10 (top view) out of the
C a s e CY-2712/TRC-68 (4th
clamp.
Echelon)
(8) Remove the two roundhead screws
and lockwashers (10) on the lower-
a. Removal.
left corner (top view).
(1) Remove the power supply as di-
(9) Remove the roundhead and the hex-
rected in TM 11-5820-222-20.
agonal-head screw (10) adjacent
(2) Disconnect plug P1401 from jack
to the directional coupler in the
J1407 (fig. 43).
lower right corner (top view).
(3) Remove the four Phillips-head re-
(10) Tilt the rt unit upward so that it
taining screws and lockwashers on
rests on the rear of the mainframe.
top of the case.
Remove the two roundhead screws
(4) Remove the ac case blower from
and lockwashers directly below and
the AN/TRC-68 case.
and behind the memory drum.
b. Replacement.
(11) Carefully slide the frequency se-
(1) Insert the ac case blower into the
lector off the main chassis.
power supply section of the AN/
b. Replacement.
TRC-68 case with the mounting
(1) Carefully center the frequency se-
plate up, and align the mounting
lectcr on the main chassis and re-
plate with the four mounting holes.
place two roundhead screws (10)
(2) Replace the four Phillips-head re-
and lockwashers in the upper left
t a i n i n g screws and washers
corner, and two roundhead screws
through the mounting holes on the
and lockwashers directly below and
top of the AN/TRC-68 case, and
behind the memory drum. Do not
tighten them securely.
tighten.
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