9220. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 2 PILOT STATION)
MAINTENANCE OPERATIONAL CHECK (cont)
Refer to (fig. 9178) for pilot station configuration and component
If referenced out of one paragraph or volume into another for additional
troubleshooting, upon completion of the task, return to the maintenance
operational check for the original paragraph or volume.
1. Complete the maintenance operational check as follows:
a. Detach P4.
b. Check for short between:
P4-J and ground,
P4-G and ground.
If short exists, go to paragraph 9222.
c. On pilot ELEC PWR panel (fig. 9179), set
BATT/EXT PWR switch to EXT PWR.
BATT / EXT PWR
Pilot ELEC PWR Panel
d. Check for 28 VDC at (A402):
J4-J and J4-G.
If 28 VDC is not present, go to paragraph 923 to
troubleshoot dc electrical power generation.
e. On pilot ELEC PWR panel, set BATT/EXT
PWR switch to OFF and connect P4.