TM 11-6625-2440-12
4-17.
Chassis Removal and Replacement Control-
(3) Remove eight screws (13) and washers
display unit chassis removal and replacement is typical
(14) to release heat sink (17), with attached screws (15)
for both units of the test set and is illustrated in figure 4-1.
and standoffs (16), from power supply.
(4) Disconnect connector 1A1P1 (18) and
a. Removal. Remove 12 stud nuts (1) and
remove power supply (19).
b. Replacement.
remove chassis from combination case (2).
b. Replacement. Replace chassis in combination
(1) Connect connector 1A1P1 (18) to power
supply (19).
case (2) and secure with 12 stud nuts (1).
(2) Tighten screws (15) to standoffs (16) and
secure seat sink (17) to power supply (19) by replacing
4-18. Circuit Cards 1A1A1 through 1A1A4 and 2A1A1
eight screws (13) and washers (14).
through 2A1A16, Removal and Replacement.
(3) Secure rear mounting plate (9) to standoffs
(16) by replacing eight screws (10), lockwashers (11),
Control-display unit card removal and replacement for
and washers (12).
cards 1A1A1 through 1A1A4 is typical for electronics unit
(4) Insert power supply assembly into chassis
cards 2A1A1 through 2A1A6. Card 1A1A4 is exploded in
and secure rear mounting plate (9) by replacing nine
screws (7) and washers (8).
CAUTION
Use care when removing and replacing
4-20. Panel Components, Removal and
circuit cards; rough handling may damage
Replacement
connector pins.
Control-display unit knob and indicator parts removal and
a. Removal. Loosen two thumbscrews (3) and
replacement is typical for similar electronics unit
slide retainer (4),on card cage (5) to the right so that
components and is illustrated in figure 4-1.
cards are not obstructed; carefully remove card 1A A4
a. Knob Removal. Loosen two setscrews (2) and
(6).
pull knob (2 1).
b. Replacement. Carefully insert card 1A1A4 (6);
b. Knob Replacement. Install knob (21) on shaft
slide retainer (4) to the left so that cards are locked in;
and tighten two setscrews (20).
tighten two thumbscrews (3).
c. Single-Lamp Type Indicator Lens and Lamp
Removal. Unscrew lens (28) and pull defective lamp
4-19. Power Supply
(29) from lens.
1A1 PSI, Removal and Replacement
d. Single-Lamp Type Indicator Lens and Lamp
Replacement. Insert lamp (29) into lens (28) and screw
a. Removal.
lens
(1) Remove nine screws (7) and washers (8);,
into socket.
pull out rear mounting plate (9) with attached heat sink
e.
Dual-Lamp Type Indicator Lamp Removal.
and power supply.
Remove two screws (22) to release legend plateholder
(2) Remove eight screws (1), lockwashers
(23), legend plate (24), and gasket (25);
(11), and washers (12) to release rear mounting plate (9)
from heat sink and power supply.
4-8
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