NEC NDA-24300 manual CPR Replacement Procedure, PZ-IO27 Note

ATTENTION Contents Static Sensitive

Handling Precautions Required

UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE

1.3.1CPR Replacement Procedure

This section explains how to replace the Control Processor Rack (CPR). Before starting the procedures, make a backup copy of the main data, such as office data,

Call Forwarding (CF) data and Speed Calling (SPD) data, on to the hard disk of the HFC. Figure 4-2shows the front view of the CPR. Operate the related keys and con-

nectors to replace the CPU with a new one. Using a Phillips screwdriver, remove the four screws and extract the CPR with care, as shown in Figure 4-3.

PZ-IO27 Note

SW	HDD MB
		CPUOPEWDT IMG0
	ON
		MBR
	FDD
	OFF	IMG1	IMG2 IMG3

SYSTEM SELECT0								STATUS
1	2	3	4
ON
OFF
5A
SYSTEM SELECT1
1	2	3	4	5	6	7	8	SENSE
ON
OUT PWR

OFF	2	4 6
PALM	E C A
	0
SYSTEM SELECT2

ON	2	3	4	5	6	7	8	CPURST
1

	ON	OFF
IN PWR	OFF

SLOT No. 0 1 2 3 4 5 6

PZ-PW92

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

Figure 4-2 CPR Face Layout

CHAPTER 4 NDA-24300

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