NEC Neax 2400 Imx System Operations And Maintenance Manual

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3.3.4 PWR Card Replacement Procedure
The PWR (PA-PW55-A/PA-PW55-B) and DPWR (PA-PW54-A/PA-PW54-B)
cards are mounted respectively in Slot No. 1 and Slot No. 3 of each PIM. The card’s
main function is to provide operating power to the circuit cards accommodated in
the PIM. The procedures to replace the PWR/DPWR card are as follows:
Replacement Procedure
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 OPE...

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ATTENTIONContents
Static Sensitive
Handling
Precautions Required
 OPE lamp on the new card is OFF.
 OPE lamp on the new card is green.
END
A
Insert the new card into the PIM.
Turn OFF the MB key on the card.
Extract the card to be replaced. Connect the power cable to the -48V IN 
connector. Turn ON the MB key on the new card. 

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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...

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Figure 4-20   Preparation for FANU Replacement (Fans on TOPU)
STEP 5 Remove 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)...

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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 cover again to the original location.
Figure 4-21   How to Replace FANU (Fans on TOPU)
ATTENTIONContents
Static Sensitive
Handling
Precautions Required
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Replacement Procedure: FANU in Fan Box
When the FANU is mounted in the fan box, perform the following replacement:
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 4-22.)
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,...

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STEP 5 Take off the four screws fastening the fan to be replaced. (Refer to Figure 4-23.)
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...

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5. 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...

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Figure 4-25   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 4-26.
Figure 4-26   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 4-26 and...

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STEP 11 Insert the CPR back into the LPM.
STEP 12 Fasten the CPR and LPM with the four screws.
STEP 13 Connect the disconnected power, bus, and ether cables to the relevant connectors.
STEP 14 Turn ON the SW key on the PZ-PW92.
STEP 15 Connect the disconnected power alarm cable to the PALM connector on the PZ-PW92.
STEP 16 Analyze the indicated system message. The message displayed when the PWR SW on the PZ-
PW92 was turned...