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A
747-400 MAINTENANCE MANUAL
 (c)  Do the continuity check to each wire from each electronic box
 connector to the applicable wire wrap post on the WIU.
 NOTE:____ Do this to all wires in the system before you do the
 subsequent step.
 (d)  Do the continuity check to each wire from each wire wrap post
 to the applicable wire wrap post on the WIU.
 NOTE:____ Do this to all the wires in the system before you do the
 subsequent step.

 S 842-078
 (7) Repair the wires if it is necessary.
 NOTE: Refer to the task Wires on Wire Wrap Posts Repairs.
____
 S 412-033
 (8)
Install all the electronic boxes (black boxes) that you removed.

 S 092-034

 (9)
Remove the insulated sockets from the wire wrap posts.

 S 412-035

 (10)
 Install the WIU cover on the applicable rack (View B, Fig. 201):

 (a)
Put the WIU cover on the unit.

 (b)
Install the bolts.

 

 S 092-036
 (11)
 Remove the ESD wrist strap from the electrostatic ground receptacle on the WIU rack (Fig. 201).

 S 092-037

 (12)
 Remove the ESD wrist strap from your wrist.

 NOTE: Put the ESD wrist strap in one of the empty bags that are at
____ the ends of the WIU rack (Fig. 201).
 S 412-038
 (13) Install the cargo lining on the aft side of the electronic rack:
 (a)
Put the cargo lining in its position.

 (b)
Install the bolts.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-41-03
 ALL  ú ú 01 Page 211 ú Oct 10/95
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747-400 MAINTENANCE MANUAL
 TASK 20-41-03-002-039
 5.  Removal of a WIU from the Airplane (Fig. 203)__________________________________
 A. Access
 (1)
Location Zones

 117/118  Electronics and Electronics Compartment - Left and Right

 (2)  
Access Panel
 125B Access Door Electronics

 B.
References

 (1)
AMM 24-22-00/201, Electrical Power

 C.
Procedure - WIU Removal

 S 862-040
 CAUTION: REMOVE THE EXTERNAL POWER, ENGINE GENERATOR POWER, APU
_______ GENERATOR POWER, AND ALL BATTERY POWER FROM THE AIRPLANE BEFORE YOU REMOVE THE WIU. IF YOU DO NOT REMOVE ELECTRICAL POWER WIRES THAT ARE NOT CONNECTED CAN CAUSE SPARKS. SPARKS CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (1)
Remove all the electrical power (Ref 24-22-00/201).

 S 862-041

 (2)
Remove all the battery power.

 S 012-042

 (3)
Remove the cargo lining from the aft side of the electronic rack:

 (a)
Remove the bolts.

 (b)
Remove the cargo lining.

 

 S 492-071
 CAUTION:_______YOU MUST PUT A ESD WRIST STRAP ON YOUR WRIST. YOU MUST CONNECT THE ESD WRIST STRAP TO THE ELECTROSTATIC GROUND RECEPTACLE ON THE WIU RACK. MAKE SURE THE ESD WRIST STRAP IS ON YOUR SKIN. IF THERE IS MATERIAL BETWEEN THE STRAP AND YOUR SKIN, THE GROUND CIRCUIT WILL NOT BE SATISFACTORY. THE ELECTRONIC SHELVES AND THE WIRES ARE CONNECTED TO ELECTROSTATIC SENSITIVE EQUIPMENT. IF YOU DO NOT CORRECTLY USE THE ESD WRIST STRAP, YOU CAN CAUSE MUCH DAMAGE TO THE EQUIPMENT.
 (4) Attach a ESD wrist strap to your wrist.
 NOTE: The ESD wrist straps are kept in bags at the two ends of the
____
 WIU racks (Fig. 203).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-41-03
 ALL  ú ú 01 Page 212 ú Jun 18/01
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747-400
MAINTENANCE MANUAL

ELECTROSTATIC GROUND RECEPTACLE
ESD WRIST STRAP

ESD WRIST STRAP

 

 

 

E1-1 SHOWN - E1-2 THRU E1-6 AND E2-1 THRU E2-6 SIMILAR
(CARGO LINING NOT SHOWN)
　
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