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TM 9-4110-257-14
4-21. CIRCUIT BREAKER CB1 TESTING AND REPLACEMENT. - Continued
NOTE
The circuit breaker can be manually operated by pushing the button on it. When on, the
button is in. When off, the button is out exposing a white band.
(3) Using multimeter set to measure continuity, check circuit breaker (5) continuity between terminals 1 to 2, with
circuit breaker in both the on (button in, no white band showing) and off (button out, white band showing)
position. Continuity should be indicated only when circuit breaker (5) is in the on position. If continuity was
indicated in the off position or if no continuity was indicated in the on position, replace circuit breaker (5).
(4) If no failure was indicated, install wire leads (4) per tags and wiring diagram (fig. 1-4). Remove tags.
(5) Close control panel (3) and install two new lock washers (2) and bolts (1).
b.
Removal.
(1) Be sure battery has been disconnected and remove two bolts (1) and lock washers (2). Open control panel
(3). Discard lock washers.
(2) Tag and disconnect wire lead terminals (4) and remove.
(3) Pinch the side tabs on circuit breaker (5) and remove from the front of the control panel.
c.
Installation.
(1) Install circuit breaker (5) through the front of the control panel (3).
(2) Using tags and wiring diagram (fig. 1-4), install wire lead terminals (4). Remove tags.
(3) Close control panel and install two new lock washers (2) and bolts (1).
(4) Be sure circuit breaker button in pushed in, and white band is not showing.
NOTE
FOLLOW-ON MAINTENANCE:
Unlatch and close control panel cover door.
Connect battery (para 4-35) and put unit back into service.
4-56
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