ARMY TM 5-6675-309-14
MARINE CORPS TM 08840A-14/1
(23) Diodes VR6, VR11, and VR21. Remove and
panel (51) to PSTS instrument case (1).
replace typical diode VR11 (147, figure 8-6,
Remove PSTS front panel far enough to
sheet 4) as follows:
provide access to diode VR9 (181, figure
(a) Removal.
Tag and unsolder wires from diode VR9
2.
1. Remove 20 screws (49, figure 8-6, sheet 1)
(181). (Do not unsolder wire from lug.)
and washers (50) securing PSTS front
Remove two screws (142), six washers (141,
3.
panel (51) to PSTS instrument case (1).
141.1, and 180), one lug (140), two washers
Remove PSTS front panel far enough to
(139), one insulator (182), two lockwash-
provide access to diode VR11 (147, figure
ers (179), and two nuts (178) securing
8-6, sheet 4).
diode VR9 (18 1) to relay bracket no. 1
2. Tag and unsolder wires from diode VR11
(138). Remove diode VR9.
(147). (Do not unsolder wires from lug.)
(b) Replacement.
3. Remove nut (177), lockwasher (176),
Place diode VR9 (181) in relay bracket
1.
washer (175), two mica washers (149 and
no. 1 (138).
174), heat-shrinkable tubing (150), and
lug (148) securing diode VR11 (147) to
Install two screws (142), six washers (141,
2.
relay bracket no. 1 (138). Remove diode
141.1, and 180), one lug (140), two washers
VR11.
(139), one insulator (182), two lockwash-
(b) Replacement.
ers (179), and two nuts (178) securing
diode VR9 (181) to relay bracket no. 1
1.
Cut length of heat-shrinkable tubing (150)
(138).
(MIL-I-23053/5A) sufficient to insulate
Solder wires to diode VR9 (181).
3.
diode VR11 (147) stud from relay bracket
no. 1 (138).
Place PSTS front panel (51, figure 8-6,
4.
sheet 1) in PSTS instrument case (1).
2.
Install lug (148), mica washer (149), and
Align mounting holes.
heat-shrinkable tubing (150) on diode
VR11 (147) stud.
Install 20 screws (49) and washers (50)
5.
securing PSTS front panel (51) to PSTS
Place diode VR11 (147) in relay bracket
3.
instrument case (1).
no. 1 (138).
Install mica washer (174), washer (175),
(25) Resistors R3, R4, R66 thru R71, and R129.
4.
Remove and replace typical resistor R71 (129,
lockwasher (176), and nut (177) securing
diode VR11 (147) to relay bracket no. 1
(138).
(a) Removal.
NOTE
1.
Remove 20 screws (49, figure 8-6, sheet 1)
and washers (50) securing PSTS front
Check that there is no continuity between
panel (51) to PSTS instrument case (1).
conductive materials separated by mica
Remove PSTS front panel far enough to
washers to ensure mica washer has not
provide access to resistor R71 (129, figure
been damaged during assembly.
8-6, sheet 3).
5. Solder wires to diode VR11 (147).
Tag and unsolder wires from resistor R71
2.
6. Place PSTS front panel (51, figure 8-6,
(129).
sheet 1) in PSTS instrument case (1).
Remove two screws (127), washers (128
3.
Align mounting holes.
and 130), lockwashers (131), and nuts
7. Install 20 screws (49) and washers (50)
(132) securing resistor R71 (129) to relay
securing PSTS front panel (57) to PSTS
bracket no. 1 (138, figure 8-6, sheet 4.
instrument case (1).
Remove resistor R71.
(24) Diodes VR5, VR9, and VR10. Remove and
(b) Replacement.
replace typical diode VR9 (181, figure 8-6,
1. Place resistor R71 (129, figure 8-6, sheet
sheet 4) as follows:
3) on relay bracket no. 1 (138, figure 8-6,
(a) Removal.
sheet 4). Align mounting holes.
1. Remove 20 screws (49, figure 8-6, sheet 1)
2. Install two screws (127, figure 8-6, sheet
and washers (50) securing PSTS front
3), two washers (128), two washers (130),
Change 1
