TM 3-6665-209-35
2. Remove two screws (2, fig. 13)
chassis have specific functions which are described in
and lockwashers (3) from the
TM 3-6665-209-12. The electrical chassis (13, fig. 12) is
bottom of the electrical chassis
an anodized aluminum alloy flanged plate that is
(1g) and remove the keying
mounted on four spacers (6, fig. 13) attached to the top
relay K2 (7, fig. 12).
of the chassis base.
These spacers elevate the
(c) Power transformer T1.
electrical chassis above the chassis base permitting
1. Mark the eight wires leading to
room for the electrical parts and wires located on the
the power transformer T1 (8)
underside of the chassis. The interval timer M1 (1, fig.
and disconnect two wires
12), test cycle timer M2 (5), keying relay K2 (7), electron
leading from the transformer at
tube V1 (11), power transformer T1 (8), selector switch
terminals 2 and 3 on the
S8 (17), terminal board TB1 (20), and holding relay K1
terminal board TB1 (20) by
(25) are mounted on the upper side of the electrical
loosening the terminal screws
chassis. Beneath the electrical chassis are mounted the
and
removing
the
wires.
electron tube socket (10, fig. 13), resistor R4 (12),
Unsolder the remaining six
capacitor C3 (13), resistor R2 (14), resistor R3 (16), and
wires at the terminals of the
capacitor C1 (17).
b. Maintenance.
Fourth echelon maintenance
2. Remove two screws (9) and
personnel are authorized to disassemble the electric
lockwashers (10) which secure
chassis assembly. However, the individual components
the power transformer T1 (8) to
are not reparable and must be replaced if they are
the two rods (12). Remove the
defective.
3. Remove two screws (15) and
(1) Removal. Remove the electric chassis
lockwashers (14) to remove
assembly as described in TM 3-6665209-
both the rods (12) from the
12.
electrical chassis (13).
(2) Disassembly.
(d) Selector switch S8.
(a) Interval timer M1 and test cycle
1. Mark the four wires leading to
timer M2.
the selector switch S8 (17) and
1. Mark the five wires leading to
unsolder
them
from
the
the interval timer M1 (1, fig. 12)
terminals on the switch.
and the four wires leading to the
2. Remove the locknut (16) from
test cycle timer M2 (5).
the selector switch S8 (17) atop
Unsolder the wires at their
the electrical chassis and
terminals on the timers.
remove the switch from the
2. Remove
four
nuts
(28),
underside of the electrical
lockwashers (27), and screws
chassis (13).
(23) and remove the housing
(e) Terminal board TB1.
which contains the interval timer
1. Make certain all wires leading to
M1 (1) and the test cycle timer
the terminal board TB1 (20) are
M2 (5).
Remove the four
marked and loosen the terminal
spacers (6).
screws.
Remove all wires
3. Remove
three
nuts
(2),
leading to the terminal board.
lockwashers (3), and screws (4)
2. Remove four nuts (18) and
and separate the interval timer
screws (21) and remove the
terminal board TB1 (20) and the
M1 (1) from the test cycle timer
designation plate (19) from the
M2 (5).
electrical chassis (13).
(b) Keying relay K2.
1. Mark all wires leading to the
Note
keying relay K2 (7) and unsolder
the wires at .their terminals on
The fanning strip (22) is removed
the relay.
when the electric chassis assembly
is removed (TM 3-6665-209-12).
(f) Holding relay K1.
1. Mark all wires leading to the
holding relay K1 (25) and
unsolder
AGO 8069A
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