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 TM 9-4120-425-14&P
CIRCUIT BREAKER UNIT MAINTENANCE - Continued
0033-00
WARNING
Disconnect air conditioner power supply.
REMOVAL
1.
Disconnect connector P4(15) from connector J4(14) by turning connector P4 counterclockwise.
2.
Remove four screws (3), and four lockwashers (4) to remove circuit breaker housing (22) from circuit breaker panel
(35).
3.
Remove two screws (5) to remove cover (6).
INSPECTION
Circuit Breaker (21)
1.
Inspect toggle for chips, creaks, or damage. Replace circuit breaker if found.
2.
Inspect wiring for breaks or damage. Replace if found.
3.
Inspect for distinct click and engagement of circuit breaker when placed in ON position. Replace if not found.
4.
Inspect for smooth motion to OFF position. Replace if not found
Connectors J2, J3, J4, and P4 (30), (34), (14) and (15)
1.
Inspect wiring for breaks, fraying, discoloration, or damage. Replace if found.
2.
Inspect soldered connections for breaks or damage. Repair or replace if found.
3.
Inspect pins for bending or corrosion. Straighten bent pins if possible. Clean minor corrosion. Replace if necessary.
4.
Inspect electrical contacts for corrosion. Replace or clean as necessary.
TEST
Circuit Breaker (21)
1.
Tag and disconnect leads.
2.
Check for continuity in ON position between contacts A1 and B1; A2 and B2; A3 and B3. Continuity should exist.
No continuity should exist between these contacts in the OFF position.
3.
Replace if fails test.
0033-00-2
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