UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE

4.Fan Unit Replacement

This section explains how to replace the Fan Unit (FANU), which is fastened on the TOPU or inside the ded- icated fan box within the system. Because the fan is a vital device to protect the system from heated air, it is recommended that the fan (a total of three per unit) be replaced at least every two years to guarantee its high performance.

The mounting location of FANU differs, depending on the module configuration of each cabinet. When the system consists of a total of three modules or less, the FANU is mounted on the TOPU of the cabinet. Other- wise, the FANU is housed in the dedicated fan box in the center of the cabinet. Refer to Figure 4-19.

NEC

NEAX 2400 IMX

TOPU

TOPU

NEC

NEAX 2400 IMX

FAN BOX

FANU is located here.

FRONT VIEW

/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

When FANU is mounted on TOPU

When FANU is mounted in FAN BOX

Figure 4-19 FANU Locations

Replacement Procedure: FANU on TOPU

When the FANU is mounted on the TOPU, perform the following replacement procedure:

STEP 1 Using a Phillips screwdriver, remove the four screws. Lift away the top cover.

STEP 2 Turn OFF the PWR SW on the PZ-M369. (Refer to Figure 4-20.)

STEP 3 Remove the fan fuse (5A) on the PZ-M369.

STEP 4 Remove the fan cables from the fan connector and the connector(s) corresponding to the fan to be replaced (for example, when replacing FAN #0, disconnect the FC0 connector together with the fan connector).

CHAPTER 4

NDA-24300

Page 296

Issue 1

Page 323
Image 323
NEC NDA-24300 manual Fan Unit Replacement, Replacement Procedure Fanu on Topu