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 TM 55-1905-242-14
UNIT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
24 VOLT CONTROL AND DISTRIBUTION PANELS, TEST/REPAIR
INITIAL SETUP:
Tools and Special Tools:
Personnel Required:
Tool Kit, Mechanic's Rail and Marine
Two Watercraft Engineers, 88L
(Item 1, Table 1, WP 0230 00)
Multimeter (Item 2, Table 1, WP 0230 00)
References:
FM 55-502
TM 55-1905-242-24P (WP 0031)
TESTING
WARNING
Take great care when working around energized electrical equipment. Contact between
unprotected body parts and electrical conductors can cause serious injury or death. Do
not wear jewelry or other conductive items while servicing energized electrical equip-
ment. Failure to comply can cause serious injury or death.
1.
Operate each circuit breaker in the given panel and ensure that it controls its device. If any circuit breaker fails to control
its device, test the circuit breaker:
a.
Set the multimeter to the Vdc (Volts direct current) setting.
b.
Place one voltmeter lead on each of the circuit breaker terminals (1) and note the voltage. With the circuit breaker in
the OFF position, the multimeter should read 24 Vdc. With the circuit breaker in the ON position, the multimeter
should read 0 Vdc. If these readings cannot be obtained, the circuit breaker is defective. If these readings are
obtained, the circuit breaker is operating normally.
2.
If any circuit breaker is found to be defective, replace it.
REPAIR
Repair of the 24 Volt control and distribution panels is accomplished by the replacement of defective circuit breakers. The
procedure for circuit breaker replacement appears in the Removal and Installation procedures in this work package.
0096 00-1
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