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 TM 55-1905-220-14-9
4-48.1. ALARM SWITCHBOARD - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
c.
Switch (10)
Replace.
d. Nut and
Install.
knob (9)
e. Wiring
Reconnect and remove
tag.
5. TEST
a. Lens cover
Unscrew and remove.
LIGHT
and
b. Lamp (11)
Twist and remove.
socket
c.
Wiring
Unsolder.
d. Nut (12)
Remove.
e. Light socket
Remove and install new
(13)
light socket.
f.
Nut (12)
Install.
g. Wiring
Resolder.
h. Lamp (11)
1. Aging.
Age lamp by
operation for
24 hours at
20 MA, (24
hours at 180
VAC) and 24
hours at 10 MA
(12 hours at
100 VAC).
2. Install.
i.
Lens cover
Install.
6. Lamps
a. Lamp (14)
Twist and remove.
neon and
sockets
b. Wiring
Unsolder.
c.
Screws (15)
Remove.
and lock-
washers
(16)
4-1242
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