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Replacement of Logic Circuit Card Assembly A79A1
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TM-9-1240-369-34 Range Finder Fire Control: (Laser) AN/VVG-1 (1240-00-470-2156) Manual
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Figure 3-5. Disassembly of headrest assembly.
TM 9-1240-369-34
(8) Install  access  over  as  instructed  in
(7) Install new indicator light by performing
paragraph 3-9 a steps (2) and (3).
steps (2) thru (5) in reverse order.
f. Replacement of Lamps (see fig. 3-4).  The
(8) Install access cover as instructed in
paragraph 3-9 a steps (2) and (3).
following steps are applicable to replacement of lamps in
h. Replacement of DMR Switch S1, TSW Switch
pushbutton switches S4 thru S6.
S2, and Switch Lens Seal (39) (see fig. 3-1). The
(1) Unscrew and remove switch lens seal (21)
following steps are applicable to either switch and switch
from housing.
lens seal (39).
(2) Pull application switch lens (22, 23, or 24)
(1) Remove access cover as instructed in
straight out from switch.
(3) Remove lamp (30).
(2) Unscrew and remove switch lens seal (39)
(4) Install new lamp (30), and applicable
from housing.
switch lens (22, 23, or 24).
(3) Tag  all  leads  to  the  switch  for
(5) Install switch lens seal (21) to housing.
g. Replacement of Indicator Lights DS4 thru DS8
identification. Unsolder the leads.
and Preformed Packings (see fig. 3-4). The following
(4) Remove seal adapter (40), lockwasher
(41), key washer (42) and preformed packing (43) from
steps are applicable to each indicator light (33 thru 37)
switch S1 (44) or switch S2 (45).
and performed packings
(5) Lubricate preformed packing (43)  by
(1) Remove access cover as instructed in
applying a thin, Uniform, film of grease, MIL-G-4343.
paragraph :3-9 a step (1).
(6) Install new switch lens seal and switch by
performing steps (2) thru (4) in reverse order.
NOTE
(7) Install access cover as instructed in
Readout indicator assembly (13) must
paragraph 3-9d steps (2) and (3).
be removed only when replacing
indicator lights (30, 31, and 32).
3-10. Inspection of Commander's Control Unit (A79).
a. Inspect the general condition of all parts. Check
(2) Remove readout circuit assembly (13) as
for wear or other conditions indicating deterioration.
described in paragraph :3-9 c.
b. Inspect lens filter.  indicators, switches, and
(3) Tag  all  leads  to  the  switch  for
screws for corrosion; check machine surfaces for
identification. Unsolder respective indicator light leads.
conditions that may prevent alinement with mating parts:
(4) Remove nut (31) and lockwasher (32)
check lens filter for scratches and all switch lens seals
from back of faulty, indicator light.
for holes or tears.
(5) Push fault indicator light (33 thru 37) out
c. Check electrical wiring for chafed or broken
through front panel. Retain preformed packing (38).
wires and bad solder connections.
(6) Lubricate preformed packing (38)  by
d. Inspect machined sealing surfaces for scratches.
applying a thin, uniform film of grease, MIL-G4-4343.
debris or excessive lubricant that may prevent proper
Apply hand to entire surface of the preformed packing.
sealing.
Section VI. REPAIR OF HEADREST ASSEMBLY
support (3).  When installing new headrest, secure
3-11. Disassembly of Headrest Assembly (See fig. 3-
headrest to support with two screws. Seal the screws
with sealing compound, MIL-S-11031, and torque to 50
The repair of the headrest assembly is limited to
inch-pounds.
replacing the headrest. The headrest is replaced by
removing two screws (1) which secure headrest (2) to
3-14

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