TM 1-1520-238-T-6
9–528
9–249. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 3 – CPG STATION) –
9–249
MAINTENANCE OPERATIONAL CHECK (cont)
Task
Result
d. On CPG circuit breaker panel 2 (fig. 9–188),
check that CDU (CB6) circuit breaker stays
closed.
If CDU circuit breaker (CB6) does not stay closed, go
to paragraph 9–261.
e. On pilot ELEC PWR panel (fig. 9–186), set
BATT/EXT PWR switch to OFF.
f. Remove to gain access, CPG circuit breaker
panel 1 (TM 1-1520-238-23).
g. On pilot ELEC PWR panel (fig. 9–186), set
BATT/EXT PWR switch to EXT PWR.
h. Check for 28 VDC at P769-A and P769-J.
If 28 VDC is not present, go to paragraph 9–262.
i. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to OFF.
j. Check for continuity between (A77):
J4-J and J2-32.
If continuity does not exist, go to paragraph 9–251.
k. Check for continuity between (A77):
J4-J and J2-24,
J4-J and J2-33.
If continuity does not exist, go to paragraph 9–252.
l. Check for continuity between (A77):
J4-J and J2-20,
J4-J and J2-21.
If continuity does not exist, go to paragraph 9–253.
m. Check for continuity between (A77):
J4-A and J2-7.
If continuity does not exist, go to paragraph 9–254.
n. Check for continuity between (A77):
J4-A and J2-11.
If continuity does not exist, go to paragraph 9–255.
o. Check for continuity between (A77):
J4-A and J2-9.
If continuity does not exist, go to paragraph 9–256.
p. Check for continuity between (A77):
J4-A and J2-8.
If continuity does not exist, go to paragraph 9–257.
q. Check for continuity between (A77):
J4-A and J2-10.
If continuity does not exist, go to paragraph 9–258.
r. Check for continuity between (A77):
J4-A and J2-14.
If continuity does not exist, go to paragraph 9–260.
s. Check for continuity between (A77):
J4-A and J2-13.
If continuity does not exist, go to paragraph 9–259.
