Removal and Installation Instruction

TM 5-6350-262-14/7/NAVELEX 0967-466-0970/TO 31S9-4-28-1

properly assembled and that the unit will meet

(2) Remove 4 screws (16, fig.

C-1) and 4

performance standards During the repair process,

washers (17, fig. C-1) from relay and printed wiring

inspect the alarm switch for the following:

board assembly.

(1) Components for cleanliness.

(3) Unsolder 2 wires from alarm light printed

(2) Painted surfaces for deterioration or scratches

wiring board (PWB2~

(3) Screws for damage or corroded threads

(4) Move relay and printed wiring board assembly

(4) Nuts and screw holes to insure they are not

(18, fig. C-1) out of the way as far as the wire bundle will

stripped.

allow to permit removal and installation of the alarm light.

(5) Components for breaks, chips, or cracks

(5) Using a drift punch and light hammer, drive the

(6) Moving parts for wear.

diode and mounting assembly out of the mounting hole

(7) Electrical wiring for fraying or other damage.

and into the inside of the alarm switch housing.

(8) All attaching and mounting hardware for

(6) Remove any potting compound remaining on

tightness

the inside wall of the alarm switch housing.

b. Cleaning. Use a mild solution of warm water and

(7) Remove any foreign matter resulting from

diode removal from the alarm switch housing.

liquid soap to clean housing and cover parts. After

c. Installation of Alarm Light (fig. 7-2.)

cleaning, rinse parts with cold water to remove any soap

(1) Push diode holder into mounting hole.

solution. Dry thoroughly. Use a soft camel's-hair brush

(2) Insert diode into holder as far as possible. Turn

or vacuum cleaner with suitable attachment to remove

diode so that the flat spot on the base flange faces

accumulated dust from components within the alarm

outboard.

switch housing.

c. Repair Precautions. Use standard maintenance

(3) Press holder tight against the alarm switch

housing with the thumb of , one hand and install collar.

practices and observe the following precautions:

Make sure assembly is squeezed tightly together.

(1) Use exact replacement parts if possible; a part

(4) Insert diode leads through the 2 holes in

with the same electrical value or function but different

printed wiring board PWB2.

physical size may cause trouble.

(5) Seat PWB2 against the base of the diode and

(2) Soldering irons of less than 50 watts should be

bend each wire lead over 90 degrees inside each

used to solder this equipment. Overheating of some

terminal slot to hold PWB2 in position. Cut off excess

parts may cause damage.

wire leads

(6) Mix a small amount of general purpose casting

7-10. Removal and Installation Instruction.

and potting compound conforming to Military

Specification MIL-I-16923.

a. General. All replaceable components of the

(7) Using a small, stiff wire or other suitable object

alarm switch, with the exception of the alarm light (22,

having a 1/4circle curve at one end, apply potting

fig. C-1) and cover gasket (5), are easily removed and

compound completely around the installed diode

replaced by following the order or reverse order of item

assembly at the two areas shown in figure 7-2.

numbers shown in figure C-1. Wiring of applicable

(8) Allow potting compound to cure.

components is shown in figure 7-1. The following

(9) Solder orange and blue wire to terminals 1 and

paragraphs provide detailed instructions for removal and

2 on PWB2.

installation of the alarm light and cover gasket.

b. Removal of Alarm Light. The alarm light is a light

d. Removal and Installation of Cover Gasket. The

emitting diode (LED) secured in the housing wall by

gasket (5, fig. C-l) is held in position on the cover by a

means of a diode holder, collar, and a potting compound

clear adhesive. A damaged gasket can easily be

to form a moisture-proof seal. Those items plus the

removed by hand. To install a new gasket, coat one side

printed wiring board are destroyed in the diode removal

of the gasket with RTV108 adhesive (FSN 8040-

process and must be replaced with new items. Perform

9248827 Place gasket inside cover and make sure

the following steps to remove the alarm light:

screw holes are lined up while adhesive dries

(1) If applicable, remove power unit by

disconnecting 20-volt dc input wire from terminal 7 of TB

7-2