TM 55-1930-209-14&P-11
4-11.1 Cleaning and inspection
a.
Wipe clean exterior of alarm relay module with clean cloth. Open door and vacuum clean or clean inside with
electrician's brush. Avoid using unauthorized solvents for cleaning inside of main processor. Solvents leave a
greasy film on components that may reduce electrical conductivity.
b.
Visually inspect for indications of burns, corrosion, loose connections, damaged parts, or chipped paint. Clean
corrosion from contacts and terminals, tighten loose connections, and replace damaged parts. Remove
corrosion with silver polish, fine sandpaper, or burnishing tool. Do not use emery paper or emery cloth or steel
wool. Vacuum to remove residue. Touch up paint according to TB 43-0144. Do not paint threads or labels.
4-11.2 Test
a.
Check input voltage from battery. If Input voltage reading is not between 25 and 28 Vdc, go to step b to check
power source and cable. If reading is between 25 and 28 Vdc, go to step c to check switch.
b.
Check battery output voltage. If output voltage reading is not between 25 and 28 Vdc check batteries. If output
voltage reading Is between 25 and 28 Vdc, check cable connections and continuity. Tighten cable connections
or repair or replace bad cable between battery and switch
c.
Check switch output voltage to main processor. If output voltage reading is not 25 to 28 Vdc, replace fuse if bad
as given In paragraph 4-11.3. If after repair switch does not operate, replace switch as given in paragraph 4-8.4.
4-11.3 Repair. Repair involves replacement of fuses
a.
Open switch door.
b.
Use fuse puller to replace fuse
c.
Close switch door
4-11.4 Replacement
a.
Removal
(1)
Tag and disconnect cables (13P13F and 13P13G) from switch.
(2)
Remove mounting hardware and remove module
b.
Installation
(1)
Install switch and secure with mounting hardware
(2)
Connect cables to switch.
4-12 Horn
WARNING
Make sure main power switch is off and circuit breaker 1 P14 or 4P14 is open (OFF) when
performing maintenance. Redtag switch with "WARNING DO NOT ACTIVATE. REPAIRS
BEING MADE."
4-12.1 Cleaning and Inspection
a.
Wipe exterior clean with clean cloth.
b.
Visually inspect for loose wire connections, corrosion, or damage. Clean corrosion and tighten loose connections
4-10
