ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
(b) Remove two screws (86), washers (81), and
nuts (80) securing inverter PS5 (82) to SPU
front subassembly (74); remove inverter PS5.
(2) Replacement.
(a) Secure inverter PS5 (82) to SPU front
subassembly (74) with two washers (81),
screws (86), and nuts (80).
(b) Solder wires to inverter PS5 (82).
e.
Suppression Resistor RT1, RT2, RT3, or RT4.
Remove and replace suppression resistor RT1 (73,
figure 8-6, sheet 3) as follows:
(1) Removal.
(a) Tag, and unsolder wires from suppression
resistor RT1 (73).
(b) Unsolder suppression resistor RT1 (73) from
terminals; remove suppression resistor RT1.
(2) Replacement.
(a) Solder suppression resistor RT1 to terminals.
(b) Solder wires to suppression resistor RT1 (73).
f. Transformer T1. Remove and replace transformer T1
(85, figure 8-6, sheet 3) as follows:
(1) Removal.
(a) Tag and unsolder wires from transformer T1
(85).
(b) Remove two screws (87), washers (84), and
nuts (83) securing transformer T1 (85) TO SPU
front subassembly (74); remove transformer
T1 .
(2) Replacement.
(a) Secure transformer T1 (85) to SPU front
subassembly (74) with two washers (84),
screws (87), and nuts (83).
(b) Solder wires to transformer T1 (85).
g. Switch S4. Remove and replace switch S4 (100,
figure 8-6, sheet 3) as follows:
(1) Removal.
(a) Tag and unsolder wires from switch S4 (100).
(b) Remove one screw (98) and washer (99); loosen
one screw (98); remove switch S4.
(2) Replacement.
(a) Secure switch S4 with two screws (98) and
washers (99).
(b) Solder wires to switch S4 (100).
h. Conector J1, J3, J4, J5, J8, J9, J10, J11, or J12.
Remove and replace connector J10 (42, figure 8-6,
sheet 2) as follows:
(1) Removal.
(a) Tag and remove wires from connector J 10 (42).
(b) Remove four nuts (40), washers (41), and
screws (5) securing connector J10 (42) to
connector mounting
panel (3); remove
connector.
(2) Replacement.
(a) Secure connector J 10 (42) to connector
mounting panel (3) with four screws (5),
washers (41), and nuts (40).
(b) Replace wires on connector J10 (42).
8-19. Logic No. 1 Electronic Component Assembly A1
Removal and Replacement. See figure 8-6 and remove and
replace logic No. 1 electronic component assembly A1 (61,
figure 8-6, sheet 1) (referred to in this paragraph as assembly
A1) as follows:
N O T E
When SPU is placed on its side, block up
back end.
a. Removal.
(1)
(2)
(3)
(4)
(5)
Press pressure relief valve (55) on bottom of
instrument case; then remove 20 screws (43) and
washers (44) securing instrument case (58) to panel
assembly (2). Remove SPU from instrument case.
Position SPU so that hinge of assembly Al (61) is
vertical; remove six screws (57) and washers (56)
securing assembly A1 to chassis (62) on side away
from hinge; swing assembly Al out on hinge.
Loosen jackscrews and disconnect connector A1P1
(63, figure 8-6, sheet 3) from connector J20 (64).
Loosen jackcrews and disconnect connector A1P2
(102) from connector J21 (101).
Remove six screws (60, figure 8-6, sheet 1) and
washers (59) securing assembly Al (61) to chassis
(62) on hinged side; remove assembly Al.
a. Replacement.
(1) Position SPU so that hinge of assembly A1
(61) is horizontal when assembly A1 is in
position to be installed; install assembly A1
Change 6
8-89
