a) On the rear of the door, loosen the screw and remove the retention feature (latch), lock washer and M22
nut.
b) On the front of the door, pull out the keyless block.
Figure 63: Disassembling the Keyless Block
Washer
2
Keyless block
1
Lock washer
4
M22 nut
3
Screw
6
Retention feature
5
The M22 nut, screw, and lock washer are common in both configurations (keyless and keyed).
Only the main block and the retention feature are different.
Note
Step 3
Assemble the key block:
a) On the front of the door, insert the key block and the front washer.
b) On the rear side of the door, lock the retention M22 nut, insert the lock washer and retention feature (latch),
and tighten the screw.
Removing and Replacing the Fan Tray
When servicing the system you must remove only one fan tray at a time and replace it in under 2 minutes.
Do not remove both fan trays at the same time.
Warning
This section describes how to remove and replace the upper or lower fan tray. The Cisco NCS 4016 chassis
is shipped with two fan trays installed.
Hardware Installation Guide for Cisco NCS 4000 Series
125
Removing and Replacing Chassis Components
Removing and Replacing the Fan Tray