TM 1-1520-238-T-6
Change 9
9–173
9–23.
DC ELECTRICAL POWER GENERATION – MAINTENANCE OPERATIONAL CHECK (cont)
Task
Result
d. On pilot aft circuit breaker panel (fig. 9–106),
ensure the POWER XFMR RECT 1 circuit
breaker (CB1) and POWER XFMR RECT 2
circuit breaker (CB4) are closed.
If both circuit breakers do not stay closed, go to
paragraph 9–27.
If POWER XFMR RECT 1 circuit breaker (CB1) does
not stay closed, go to paragraph 9–28.
If POWER XFMR RECT 2 circuit breaker (CB4) does
not stay closed, go to paragraph 9–29.
e. On pilot ELEC PWR panel (fig. 9–104), set
BATT/EXT PWR switch to OFF.
M69-066
POWER XFMR RECT 2
POWER XFMR RECT 1
Figure 9–106.
Pilot Aft Circuit Breaker Panel
f. On electrical power distribution box
(fig. 9–107), detach P4, P5, and P461.
g. On pilot ELEC PWR panel (fig. 9–104), set
BATT/EXT PWR switch to EXT PWR.
h. Check for 28 VDC at (A402):
J4-M, J4-N and J32-K
(dc essential bus 1).
If voltage is not present at (A402):
J32-K, J4-M, and J4-N, go to paragraph 9–30.
If voltage is not present on one pin and present on the
others, go to paragraph 9–31.
i. Check for 28 VDC at (A402):
J4-G and J4-J (dc essential bus 2).
If voltage is not present at (A402):
J4-G and J4-J, go to paragraph 9–32.
If voltage is not present on one pin and present on the
others, go to paragraph 9–33.
j. Check for 28 VDC at (A402):
J4-K, J4-L, J32-H, and J32-J
(dc essential bus 3).
If voltage is not present at (A402):
J32-H, J32-J, J4-K and J4-L, go to paragraph 9–34.
If voltage is not present on one pin and present on the
others, go to paragraph 9–35.3
