NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 4
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
4.3.4 PLO Card Replacement Procedure
The PLO (PH-CK16-A/17-A) card is located in Slot No. 09 or 13 within the ISWM. Used together
with a different direct digital interface circuit card, the card’s main function is to set up the clock
synchronization on the network. Use the procedures below to replace the PLO card with a spare.
Note:The ACT/STBY of PLO can be changed over via a single MB key operation on the circuit card (ACT...

CHAPTER 4 NDA-24307
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
OPE lamp on the new card is OFF. 
OPE lamp on the new card remains 
OFF.
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
END
A
Insert the new PLO card into the ISWM. On the new PLO card, set the MB key UP.
Set the MB key on the new card DOWN. 

NDA-24307 CHAPTER 4
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
4.3.5 PWR SW Card Replacement Procedure
The PWR SW (PH-PW14) card is mounted in Slot No. 00 or 01 within the ISWM. The card’s main
function is to supply DC -48V operating power to the same ISWM circuit cards and also DC +5, -5 V
and +12 V output power to the PLO cards. Use the following procedures to replace the card with a new
one.
Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
P-ON lamp...

CHAPTER 4 NDA-24307
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
5. FAN UNIT REPLACEMENT
This section explains how to replace the Fan Unit (FANU), which is fastened on the TOPU or inside the
dedicated 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...

NDA-24307 CHAPTER 4
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Figure 4-18   Preparation for FANU Replacement (Fans on TOPU)
STEP 5 Remove the four screws fastening the fan to be replaced. Refer to Figure 4-19.
Note:The removed screws are used in STEP 7 again. Do not dispose of them when unscrewing the fan here.
PBX
NECNEAX 2400 IMS
NEAX 2400 IMSNEC
Top Cover
Unscrew the top cover by using
a Phillips Screwdriver and 
remove it from the TOPU.
. ..
. ..
.........
.........
............

CHAPTER 4 NDA-24307
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
STEP 6 Remove the unscrewed fan from the FANU.
STEP 7 Fasten the new fan with the removed screws.
STEP 8 Connect the new fan cables to the fan connector and the connector(s) disconnected in STEP 4.
STEP 9 Fix the fan fuse (5A) onto the PZ-M369.
STEP 10 Set the PWR SW on the PZ-M369 to the AUTO position.
Note:The switch setting of the PWR SW can be ON, depending on the location conditions of the system.
STEP 11 Attach the top...

NDA-24307 CHAPTER 4
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
Replacement Procedure: FANU in Fan Box
When the FANU is mounted in the fan box, perform the following replacement procedures:
STEP 1 Remove the front cover of the fan box. Then, extract the FANU.
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...

CHAPTER 4 NDA-24307
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
STEP 5 Take off the four screws fastening the fan to be replaced. (Refer to Figure 4-21.)
Note:The removed screws are used in STEP 7 again. Do not dispose of them when unscrewing the fan here.
STEP 6 Remove the unscrewed fan from the FANU.
STEP 7 Fasten the new fan with the removed screws.
STEP 8 Connect the new fan cables to the fan connector and the connector(s) disconnected in STEP 4.
STEP 9 Fix the fan fuse (5A) again onto...

NDA-24307 CHAPTER 4
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UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
6. CPR COOLING FAN REPLACEMENT
This section explains how to replace a Cooling Fan in the back side of the CPR. This procedure is necessary
when a fault is detected in the Cooling Fan. Because the fan is a vital device to protect the CPR from heated
air, it is also recommended that the fan be replaced at least every two years, even if a fault is not detected.
STEP 1 Set the CPU, whose rack houses the fan to be replaced, in STBY...

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Figure 4-23   Extraction of CPR from LPM
STEP 7 Disconnect the fan cable from the connector in the backbone of CPR.
Note:The Cooling Fan is located in the backbone of CPR and the cable connector lies in its right side. Refer
to Figure 4-24.
Figure 4-24   Rear View of CPR
STEP 8 Loosen the two screws fastening the box that contains the fan inside. Slightly lift the box and
remove it from the CPR. Refer to Figure 4-24 and Figure...