(10)
 Close circuit breakers as follows for the applicable cargo door.

 (a)  
P59 Aft Equipment Panel
 1) AFT CARGO DOOR POWER UNITS

 (b)  
P414 Power Distribution Center - Left
 1) 414A21 LOWER CARGO DOOR FORWARD
 2) 414F15 CARGO DOOR CONTROL FORWARD
 3) 414F16 CARGO DOOR CONTROL AFT

 S 866-009
 (11)
 Open the door electrically to the door up position (Ref 52-34-00/001).

 S 866-011

 (12)
 Open circuit breakers as follows for the applicable cargo door.

 (a)  
P59 Aft Equipment Panel
 1) AFT CARGO DOOR POWER UNITS

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747-400 MAINTENANCE MANUAL
 (b)  P414 Power Distribution Center - Left
 1) 414A21 LOWER CARGO DOOR FORWARD
 2) 414F15 CARGO DOOR CONTROL FORWARD
 3) 414F16 CARGO DOOR CONTROL AFT

 S 026-031
 (13)
 Disconnect the P3 connector from the cargo door junction box.

 S 026-032

 (14)
 Disconnect the P2 connector from the latch actuator.

 S 026-033

 (15)
 Disconnect the P1 connector from the hook actuator.

 S 026-034

 (16)
 Disconnect the P1 connector from the cargo door junction box.

 S 766-002

 (17)
 Do a continuity check for the door up switch.

 (a)  
Get access to the switch.

 (b)  
Make sure that there is no continuity between pins 3 and 4 on the P1 connector at the cargo door junction box.

 (c)  
Push in on the switch plunger.

 (d)  
While you hold the plunger in, make sure there is continuity between pins 3 and 4 on the P1 connector at the cargo door junction box.

 S 766-014
 (18)
 Do a continuity check for the latch close switch.

 (a)  
Get access to the switch.

 (b)  
Make sure that there is continuity between pin 5 and pin 6 on the P3 connector at the cargo door junction box.

 (c)  
Push in the plunger of the switch.

 (d)  
While you hold the plunger in, make sure there is no continuity between pins 5 and 6 on the P3 connector at the cargo door junction box.

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747-400 MAINTENANCE MANUAL
 S 766-023
 (19)
 Do a continuity check of the door close switch.

 (a)  
Get access to the switch.

 (b)  
Make sure that there is no continuity between pin 10 on the P3 connector at the cargo door junction box and pin 6 on the P2 connector at the latch actuator.

 (c)  
Push in on the plungers of the hook close switch and the door close switch.

 (d)  
While you hold the plungers in, make sure there is continuity between pin 10 on the P3 connector at the cargo door junction box and pin 6 on the P2 connector at the latch actuator.

 S 766-022
 (20)
 Do a continuity check of the hook close switch.

 (a)  
Get access to the switch.

 (b)  
Make sure that there is continuity between pin 10 on the P3 connector at the cargo door junction box and pin 6 on the P1 connector at the hook actuator.

 (c)  
Push in on the switch plunger.

 (d)  
While you hold the plunger in, make sure there is no continuity between pin 10 on the P3 connector at the cargo door junction box and pin 6 on the P1 connector at the hook actuator.

 (21)
 Connect the P3 connector to the cargo door junction box.

 (22)
 Connect the P2 connector to the latch actuator.

 (23)
 Connect the P1 connector to the hook actuator.

 (24)
　
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