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104
en | Maintenance Information
6.
7.
8.
This procedure allows the faulty LTC 8901 Series CPU bay to be replaced, with zero down
time. Operator control is momentarily disabled during Steps 5 and 6.
An alternate approach is to move several of the keyboard connections to the new bay prior to
executing Step 5. These keyboards will gain system control as soon as Step 5 has executed.
PTZ control is regained once the SDU cable is moved from the old unit to the new unit.
10.6
LTC 8943/95 System Controller PC
Periodically inspect front panel chassis air filter. Clean or replace if necessary.
10.7
Replacement of Memory Backup Batteries
General operational notes
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Caution!
Lithium batteries should be replaced by qualified service personnel only.
!
The memory backup batteries are located on the CPU card(s) inside the LTC 8900 CPU bay.
The batteries provide RAM memory backup for a period of at least one year. They are only
active when main AC power to the system has been lost. The RAM memory is used to store
system operational data which is frequently changing, including time/date and system
crosspoint data (i.e., which camera is currently being displayed on which monitor). More vital
system data such as camera titles, alarm settings, user information and passwords, etc. is
stored in non-volatile memory that is not affected by the condition of the batteries or the main
AC power.
Replacement of the batteries begins with at least partial removal of the LTC 8900 CPU bay
from the rack mount unit. If applicable, temporarily close any programs running on PC
attached to CPU unit. Remove AC power and any other interface cables from CPU as
necessary to allow the main bay to be pulled forward until the front sides of the main bay can
be accessed. Remove the 4 screws at the rear of the main bay holding the enclosure top
cover.
Slide the cover back a short distance off the enclosure to allow access to the front sides of
the unit. Remove 2 screws from both sides near front to remove front panel. Support the front
panel as necessary to minimize any stress on the electrical interface ribbon cable.
The right side of the unit will contain 2 PCB modules. The top module is the Primary CPU. In
redundant LTC 8901 series bays, the bottom module is the Backup CPU. The middle board is
the relay module.
2015.01 | 10.6 |
Wait for the System Supervisor to indicate that the Data Mirroring process has
completed. This step takes a few minutes.
From the System Supervisor software, change the In Use CPU to the Primary CPU. This
moves control to the new LTC 8901 Series CPU bay.
Starting with the keyboard cables, move the remaining cables from the old CPU bay to
the new CPU bay.
Low battery conditions are indicated by LED on CPU and on-screen flashing "?? ?? ??" of
time/date fields.
Battery status can be check by keyboard operator using Keyboard User Function 43.
Batteries are checked by CPU once per day at midnight, upon power up, and after system
reset.
If batteries are replaced without power off/on (of at least 10 seconds) or reset of CPU,
LED and on-screen indicators will not display normal until next midnight is reached.
Installation Manual
LTC 8900 Series
Bosch Security Systems, Inc.
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