User's Manual

CHAPTER 4 NDA-24300
Page 242
Issue 1
UNIT/CIRCUIT CARD REPLACEMENT PROCEDURE
1.3.1 CPR 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 4-2 shows 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.
Figure 4-2 CPR Face Layout
AT TE NTIO N
Contents
Static Sensitive
Handling
Precautions Required
1
2
3
4
5
6
7
8
OFF
1
2
3
4
5
6
7
8
OFF
1
2
3
4
OFF
MBR
FDD
ON
OFF
ON
OFF
OUT PWR
PALM
IN PWR
5A
HDD
SW
MB
SYSTEM SELECT0
SENSE
SYSTEM SELECT1
SYSTEM SELECT2
CPURST
SLOT No. 0 1 2 3 4 5 6
STATUS
IMG1 IMG2 IMG3
CPUOPE
WDT
IMG0
ON
ON
ON
4
C
0
2
6
A
E
PZ-IO27
PZ-PW92
Note
Note:
In place of PZ-IO27, the CPR may be equipped with PZ-IO28, which does not have the MB
(Make-Busy) key.