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CHAPTER 4 NDA-24300
Page 296
Issue 1
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.
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).
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NEC
NEAX 2400 IMX
TOPU
NEC
NEAX 2400 IMX
TOPU
FAN BOX
located here.
FANU is
When FANU is mounted on TOPU When FANU is mounted in FAN BOX
FRONT VIEW