TM 9-4931-436-14&P
j . Column Preamp PWB Assemblies
(3) Remove hex nut, keying washer,
lock washer, and dress ring securing S1
(1) Install column preamp PWB
switch to front panel (34). Remove switch.
assembly (4) in connector on PWB A1
f. Switch, Pushbutton (S1, S2, and
(9).
(2) Apply primer (MIL-S-22473,
(1) Apply primer (MIL-S-22473,
grade T) and locking compound (MIL-S-
grade T) and locking compound (MIL-S-
22473, grade C) to threads of all
22473, grade C) to threads Of Sl, S2,
screws.
or S3 (32).
(2) Install switch in front panel
(3) on PWB A1. Secure with two flat
Secure with hex nut, keying
(34)
l
washers (2) and two screws (1). Torque
washer, lock washer, and dress ring.
to 9-12 in.-lb.
Torque to 84-103 in.-lb.
(4) Replace panel assembly (refer
k. AGC PWB Assembly Removal (fig.
Solder two wires to back of switch.
(4) Replace panel assembly (refer
(1) Remove panel assembly (refer
M16/M60 Toggle Switch (S4) Removal
(2) Remove two screws (1) and two
flat washers (2) securing retainer bar
(1) Remove panel assembly (refer
assembly (5) to PWB A1 (9).
(3) Carefully fold back retaining
bar assembly. Ensure that cables se-
(25 watts). Unsolder and tag two wires
cured to top of retaining bar are not
from back of S4 (33).
damaged.
(3) Remove hex nut and lock washer
(4) Remove AGC PWB assembly (6)
securing S4 to front panel (34).
from connector on PWB A1.
h. M16/M60 Toggle Switch (S4) Re-
1. AGC PWB Assembly Replacement
(1) Apply primer (MIL-S-22473,
(1) Install AGC PWB (6) in connec-
grade T) and locking compound (MIL-S-
tor on PWB A1 (9).
22473, grade C) to threads of S4 (33).
(2) Apply primer (MIL-S-22473,
(2) Install S4 on front panel (34).
grade T) and locking compound (MIL-S-
Secure with hex nut and lock washer.
22473, grade C) to threads of all
Torque to 7-9 in.-lb.
(3) Refer to figure 5-l. Use a
screws.
(5) on PWB A1. Secure with two flat
Solder two wires to back of S4.
washers (2) and two screws (1). Torque
(4) Replace panel assembly (refer
to 6-8 in.-lb.
(4) Replace panel assembly (refer
i. Column Preamp PWB Assemblies
Row Preamp PWB Assemblies Removal
(1) Remove panel assembly (refer
m.
(1) Remove panel assembly (refer
(2) Remove two screws (1) and two
flat washers (2) securing retainer bar
(2) Remove two screws (1) and two
assembly (3) to PWB A1 (9).
(3) Carefully fold retainer bar
flat washers (2) securing retainer bar
assembly back ensuring that cables
assembly (5) to PWB A1 (9).
(3) Carefully fold back retaining
secured to top of retaining bar are not
bar assembly. Ensure that cables se-
damaged.
(4) Remove column preamp PWB as-
cured to top of retaining bar are not
damaged.
sembly (4) from connectors on PWB A1.
6-2