NEC Xen Master System Hardware Manual page 126

NEC Australia Pty Ltd
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3.1.6 Replacing Memory Backup
The CPUB( )-U13 ETU provides memory backup for
approximately 21 days. The Ni-Cad battery should be
replaced about every two years.
1. Remove the battery cable from CN4 on the
CPUB(
CPUB( )-U13 ETU.)
2. Connect the cable from the new battery to CN4 on
the CPUB(
3. Turn off the KSU power.
4. Remove the CPUB( )-U13 ETU from the slot in the
KSU.
5. Using nippers or other similar cutting tool, cut the tie
wrap that fastens the old battery and remove the old
the battery.
6. Fasten the new battery with a tie wrap.
7. Install the CPUB( )-U13 ETU again.
8. Turn on the KSU power.
3.1.7 Main Software Upgrade for CPUB( )-U13
The Xen system uses Flash ROM to store system main
software. This allows convenient upgrade of its ability in
terms of features. The following instructions are for main
software upgrade for CPUB( )-U13.
1. Down load and store the current data base using
current MAT.
2. Ensure the memory backup battery is connected to
the CPUB( )-U13 ETU (CN4 connector).
3. Power off system.
4. Remove the CPUB( )-U13 ETU from the KTS.
5. Move SW3-1 to the 'ON (EPROM)' position.
6. Move SW 1-1&2 to the 'ON(UP)' position ("3" is not
used)
7. Install Eprom into Socket IC5 (Refer Fig 5-7)
8. Remove old PAL, Socket IC 30, and install new main
software
compatibility information)
9. Re-Install the CPUB( )-U13 ETU.
10. Power On system
11. LED's 1 & 2 will flash (approximately 2 minutes) while
Eprom is writing to the Flash Roms
12. LED's 1 & 2 go solid when upload is complete.
)-U13 ETU. (Refer
0
)-U13 ETU.
0
compatible PAL.
Installing Electronic Telephone Units
Xen Master & Xen Axis
to Figure 5-7
(Refer supplier for