NEC NDA-24300 manual CPR Cooling Fan Replacement, PZ-IO27 PZ-GT16 and PZ-GT13 Isagt

UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE

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 STBY mode via the MBR key on the DSP (Refer to Figure 4-24.) Note

Note: For the ACT/STBY changeover of the CPU, see Chapter 6.

STEP 2 Disconnect the power alarm cable from the PALM connector on PZ-PW92.

STEP 3 Turn OFF the PWR SW on the PZ-PW92 (Refer to Figure 4-24Face Layout of CPR.)

PZ-IO27	PZ-GT16 and PZ-GT13 (ISAGT)
Note

SW

O N

O F F

5A

O U T PW R

IN PW R

H D D M B	C PUO PE W D T		IM G 0
F DD	M B R
	IM G 1	IMG 2	IM G 3

	SYSTEM SELEC T0					STATU S
1			2	3	4
O N
		OFF

				SYSTEM SELEC T1
		1				2	3	4	5	6	7	8
			O N										SEN SE
					OFF										2	46
	PAL M												0
														E C
				SYSTEM SELEC T2												A
															CP U R ST
			O N
O N					OFF
O F F

SLO T No. 0 1 2 3 4 5 6

PZ-PW92 PZ-PC19 (LANI)

Note: In place of PZ-IO27, the CPR may be equipped with PZ-IO28, which does not have the MB (Make- busy) key.

Figure 4-24 CPR Face Layout

STEP 4 Disconnect the power and bus and ether cables from the relevant connectors.

•Power cables from OUTPWR, INPWR connectors on PZ-PW92

•Bus cables from the front connectors on PZ-GT13 and PZ-GT16

•Ether (UTP CTG5 ST CA-n) cables from the front connectors on the PZ-PC19.

STEP 5 Remove the front bracket, and then take off the four screws fastened onto the CPU. (Refer to Figure 4-25.)

STEP 6 Extract the CPR from the LPM. (Refer to Figure 4-25.)

NDA-24300CHAPTER 4

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