NEC Express5800/320Ma Bedienungsanleitung PDF herunterladen (Seite 57)

Replacing the System Backplane Assembly

CRU Replacement Procedures 5-11

3. Release each CPU- I ⁄ O enclosure from the system chassis, as follows:

a. Disconnect all of the data cables from the rear of the enclosure. Then,

disconnect the power cord.

CAUTION

You must disconnect a VTM network cable before you

disconnect the power cord. When you remove the power

cord, the mechanical interlock at the rear of the system

springs into the unlocked position and could damage the

VTM connector or cable (Figure 5-2, inset).

b. Ensure that the mechanical interlock on the rear of the enclosure is in the

unlocked position (number 1 in Figure 5-2). If the system is in a rack, the

unlocked position is the vertical position. If the system is in a pedestal case, the

unlocked position is the horizontal position.

c. Loosen the two thumbscrews (number 1 in Figure 5-3) on the release levers at

the front of the enclosure.

d. Pull on the two release levers to loosen the enclosure from the rails (number 2

in Figure 5-3). Pull the enclosure out only 3 or 4 inches to separate it from the

backplane. You do not need to remove the enclosures from the rails.

4. Disconnect all of the cables from the system backplane assembly, if you have not

done so already.

5. Remove the modem assembly from the system backplane assembly, as follows:

a. Disconnect the phone line from the modem assembly.

b. Loosen the two captive screws (number 2 in Figure 5-31) that fasten the

modem assembly to the system backplane assembly.

c. Disconnect and remove the modem assembly by pulling it gently off of the

system backplane assembly.

6. Loosen the two thumbscrews (number 1 in Figure 5-5) on the system backplane

assembly.

7. Slide the system backplane assembly to the left if the system is in a rack, or toward

the top of the enclosure if the system is in a pedestal case. Pull the assembly out

of the system (Figure 5-5).

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NEC Express5800/320Ma Bedienungsanleitung Seite 57