YOU CAN CAUSE MUCH DAMAGE TO THE EQUIPMENT.
(2) Attach a ESD wrist strap to your wrist.
NOTE: The ESD wrist straps are kept in bags at the ends of the
____ WIU racks (Fig. 201).
S 492-005
(3) Attach a ESD wrist strap to the electrostatic ground receptacle on the WIU rack (Fig. 201).
S 012-074
CAUTION: DO NOT PERMIT CONTAMINATION IN THE WIU WHEN THE COVER IS OFF.
_______ MAKE SURE THAT YOU KEEP CONTAMINATION OR UNWANTED MATERIAL AWAY FROM THE WIU. MAKE SURE THAT OTHER PEOPLE THAT WORK AROUND THE WIU AREA KEEP UNWANTED MATERIAL OR CONTAMINATION AWAY FROM THE WIU. UNWANTED MATERIAL OR CONTAMINATION CAN CAUSE A MALFUNCTION IN THE WIU.
(4) Remove the WIU cover from the applicable shelf:
(a) Remove the bolts that hold the cover (View B, Fig. 201).
NOTE: Do not loosen the center bolt at the top of the cover.
____ The bolt at this location is in a slot and does not hold the cover.
(b) Remove the cover.
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A
747-400 MAINTENANCE MANUAL
S 492-007
CAUTION:_______ DO NOT REMOVE THE POST COVER FROM THE WIRE WRAP POSTS. IF YOU
REMOVE THE POST COVER YOU CAN CAUSE SPARKS BETWEEN THE POSTS.
THE SPARKS WILL CAUSE DAMAGE TO THE EQUIPMENT.
(5) Put the insulated sockets on the wire wrap posts that you will check (View D, Fig. 201).
NOTE:____You can make a insulated socket. Attach a No. 16 connector socket to a connector socket of the correct size to fit the probe point of the continuity checker probe point (Fig. 202).
S 762-008
CAUTION: DO NOT TOUCH THE WIRE WRAP POSTS DIRECTLY WITH THE JUMPERS,
_______ WIRE CLIPS, OR INSTRUMENT PROBES. ATTACH THE INSULATED SOCKET TO THE WIRE WRAP POSTS BEFORE YOU DO THE CHECK. IF YOU TOUCH THE WIRE WRAP POSTS YOU CAN CAUSE A SHORT BETWEEN THE ADJACENT WIRE WRAP POSTS.
(6) Do the check for power or signals.
CRIMP SOCKETS
CONNECTOR SOCKET
#16 CONNECTOR
TO WIRE
HEAT SHRINK INSULATED TUBING WIRE
Insulated Socket Assembly
Figure 202
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747-400 MAINTENANCE MANUAL
S 092-009
(7)
Remove the insulated socket from the wire wrap posts.
S 412-010
(8)
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 092-011
(9)
Remove the ESD wrist strap from the electrostatic ground receptacle on the WIU rack (Fig. 201).
S 092-012
(10)
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 412-013
(11) Install the cargo lining on the aft side of the electronic rack:
(a)
Put the cargo lining in its position.
(b)
Install the bolts.
TASK 20-41-03-352-014
3. Wires on Wire Wrap Posts - Repair (Fig. 201)
_________________________________
A. General
(1)
Special procedures are necessary for wire wrap repairs. The Wiring Diagram Manual, Chapter 20, gives the special procedures and tools that are necessary.
B.
Access
(1)
Location Zones
117/118 Electronics and Electronics Compartment - Left and Right
(2)
Access Panel
125B Access Door Electronics
C.
References
(1)
AMM 24-22-00/201, Electrical Power
D.
Procedure - Repair the wires.
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