Nortel Meridian 1 Hardware Replacement Manual page 33

e. Remove the logic return (LTRN) (orange) wire from the backplane
bolt.
Be careful; do not drop the nut or lock washer into the pedestal.
f. Remove the wire from the frame ground bolt on the module.
g. Label and disconnect the module power connectors. These are
small orange connectors plugged into the module power
distribution unit (MPDU) in an AC-powered system, or connected
to each other in a DC-powered system.
h. Label and disconnect the system monitor ribbon cables from J1
and J2.
i. Remove the card cage from the module. Set it on a table to allow
front and back access to the MMDU.
CAUTION
Damage to Equipment
Be sure to perform the following step. If you do not
tape the EMI shield in position, you will not be able
to install the card cage in the module correctly.
j. Reposition the EMI shield (it looks like a brass grill) in the base of
the module. Tape over the front mounting tabs to hold the shield
in position. You will remove the tape later.
CAUTION
Damage to Equipment
Check for and remove any debris (such as screws)
that may have fallen into the base of the UEM
module.
4 Remove cables attached to the MMDU:
a. At the rear of the card cage, remove the three cables connected
to the back of the MMDU (see Figure on last page):(NT4N92AA),
push up the tabs and disconnect the cable.
b. On the middle cable, the Floppy Data Cable (NT4N93AA), push
up tabs and disconnect the cable.
c. On the top cable, the Floppy, CD-ROM and Hard Drive Power
Cable (NT4N95AA), squeeze the tabs, top and bottom, and
release the cable.
Replacing equipment
Hardware Replacement
Page 33 of 250