TM 1-1520-238-T-6
9–488
Change 7
9–220. CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 2 – PILOT STATION) –
9–220
MAINTENANCE OPERATIONAL CHECK (cont)
Task
Result
q. Check for 28 VDC at P1-31 and P1-48.
If 28 VDC is not present, go to paragraph 9–229.
r. Check for 28 VDC at P1-15.
If 28 VDC is not present, go to paragraph 9–230.
s. Check for 28 VDC at P1-25.
If 28 VDC is not present, go to paragraph 9–231.
t. Check for 28 VDC at P1-10.
If 28 VDC is not present, go to paragraph 9–232.
u. Check for 28 VDC at (A76) J1-AA.
If 28 VDC is not present, go to paragraph 9–232.1.
v. Attach P1 and P2.
2. On pilot ELEC PWR panel (fig. 9–179), set BATT/EXT PWR switch to OFF.
3. Disconnect maintenance headset (TM 1-1520-238-T-4).
4. Perform EXTERNAL POWER – POWER DOWN (para 9–46).
END OF TASK
