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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WIRE INTEGRATION UNIT (WIU) - MAINTENANCE PRACTICES
___________________________________________________
1. General_______
A. This procedure contains five tasks:
(1)
The first task is the instructions to do a check at a wire wrap post for power or a signal.
(2)
The second task is the instructions for repairs to the wires on the wire wrap post.
(3)
The third task is a continuity check of a Wire Integration Unit (WIU).
(4)
The fourth task is the procedure to remove a WIU.
(5)
The fifth task is the procedure to install a WIU.
B. The WIUs are on the aft side of E1-1 thru -6 and E2-1 thru -6 electronic shelves. There are 12 WIUs.
C. The wires to the WIUs come from equipment which contain static sensitive devices. Do not touch the wires or equipment on the electronic shelves unless you have an ESD wrist strap on your wrist that is correctly connect to the electrostatic ground receptacle on the WIU rack (Fig. 201).
D. You can get access to the WIUs from the cargo compartment. You must remove the cargo lining.
TASK 20-41-03-762-003
2. Wire Wrap Posts - Power or Signals Check (Fig. 201)________________________________________
A. Access
(1)
Location Zones
117/118 Electronics and Electronics Compartment - Left and Right
(2)
Access Panel
125B Access Door Electronics
B. Procedure - Wire Wrap Posts Power or Signals Check.
S 012-004
(1) Remove the cargo lining from the aft side of the electronic rack:
(a)
Remove the bolts.
(b)
Remove the cargo lining.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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
(EXTERNAL COVER NOT SHOWN)
ELECTROSTATIC SENSITIVE DEVICE
Wire Integration Unit (WUI)Figure 201 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
WIRE INTEGRATION UNIT (WIU) WIU COVER BOLT BOLT
BOLT BOLT BOLT
WIU SHOWN WITH WIU COVER INSTALLED
WIRE WRAP
CONNECTOR
CONNECTOR AND INSTALL AN INSULATED SOCKET OVER THE APPROPRIATE WIRE WRAP POSTS.
_______CAUTION: DO NOT INSERT THE PROBE OF A TEST METER INTO THE WIRE WRAP CONNECTOR UNLESS POST
COVER AND INSULATED SOCKETS ARE INSTALLED. TWO POSTS COULD BE CONTACTED AND EQUIPMENT
DAMAGE COULD RESULT.
Wire Integration Unit (WIU)
Figure 201 (Sheet 2)
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ALL ú ú 01 Page 203 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 492-067
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
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