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TM 55-1905-220-14-11
5-152. ALARM SWITCHBOARD - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR
NOTE
Refer to schematic when replacing components.
2.
a. Resistors
Replace.
51K ohm 1W
(1), 53K
ohm 1W (2),
and 750K
ohm 2W (3)
b. Power
1. Remove nuts (5),
lockwashers (6), and
(4)
flatwashers (7).
2. Tag and disconnect
wiring.
3. Replace transformer.
4. Install flatwashers
(7), lockwashers (6),
and nuts (5), and
reconnect wiring.
c.
Extension
1. Remove nuts (9),
signal
lockwashers (10),
relay (8)
and flatwashers (11).
2. Tag and disconnect
wiring.
3. Replace relay (8) on
base (12).
4. Install flatwashers
(11), lockwashers
(10), and nuts (9),
and reconnect wiring.
d. Capacitor
1. Remove nuts (14),
(13) (Elec-
lockwashers (15),
trolytic
and flatwashers
2UF 600V)
(16).
5-1572


 


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