Replacing the System Backplane Assembly
Installing and Replacing System Components
5-21
c. Loosen the two thumbscrews (number 3 in Figure 5-4) on the release levers at
the front of the enclosure.
d. Pull the two release levers to loosen the enclosure from the rails. Pull the
enclosure out about 4 in. (10 cm) to separate it from the backplane. Do not
remove the enclosures from the rails.
4. Slide the front panel about 4 in. (10 cm) out of the enclosure, as follows:
a. Referring to Figure 5-2, loosen the captive thumbscrew (number 2) at the
bottom of the front panel (number 1).
b. Gripping the bracket (number 3) on the right side of the panel, pull the front
panel straight out of its slot.
5. Disconnect any cables from the system backplane.
6. If one is installed, remove the modem assembly from the system backplane, as
follows:
a. Disconnect the phone line connector (number 3 in Figure 5-27) from the
modem assembly.
b. Loosen the two captive screws (number 2 in Figure 5-27) that fasten the
modem assembly to the system backplane assembly.
c. Disconnect and remove the modem assembly by pulling it gently off the system
backplane assembly.
7. Loosen the two thumbscrews (number 3 in Figure 5-11) on the right side of the
system backplane assembly (number 1).
8. Slide the system backplane assembly to the right, out from beneath the retaining
tab (number 2), and pull the assembly out of the system.
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