REPAIR - TM-55-1905-219-14-110572

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ALARM SWITCHBOARD - MAINTENANCE INSTRUCTIONS.

TM-55-1905-219-14-11 Landing Craft Utility (LCU) 1667 Class Boston Hull Numbers 1667-1670 NSN 1905-00-168-5764 Manual

REPAIR (COnt)

TM 55-1905-219-14-11

5-149. ALARM SWITCHBOARD - MAINTENANCE INSTRUCTIONS (Continued).

LOCATION

ITEM

ACTION

REMARKS

REPAIR

NOTE

Refer to wiring diagram when replacing components.

a. Resistors

Replace.

51K ohm 1W

(1), 53K

ohm 1W (2)

and 750K

ohm 2W (3)

b. Power

1. Remove nuts (5),

transformer

lockwashers (6),

(4)

and 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).

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