7.
SYSTEM TROUBLESHOOTING INTERCOM CIRCUITS.
a. Situation 1. When performing EPC step la (set vehicle MASTER POWER
switch(es) to ON), you observe the normal indication; but when performing
step 1b, the MX-7777B suppressor ON/OFF switch (circuit breaker) trips to
its OFF position.
This deficiency is listed on the DA Form 2404 as an
intercom input power problem (Figure 18).
The MX-7777B circuit breaker
tripping off indicates that the intercom input power circuit has a short.
Go to the Appendix and read Part One (Introduction), Part Two (Preparatory)
and the indicated step of Part Three (Equipment Performance Checklist
(EPC)).
Figure 18.
Intercom input power problem listed on DA Form 2404.
19
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