Installation Manual

Troubleshooting Guide
The LTC 8900 Allegiant system was designed to provide very high reliability. However, if a
failure does occur, the effects of the failure depend on system design and the location of the
failure.
For example, in a standard nonredundant system, an LTC 8904 Series CPU bay failure could
disable the entire system, while a monitor bay failure would disable only the monitors
connected to the failed bay.
, page 100 (below) lists the worst-case impact resulting from failure of the LTC 8900 system
components. If system troubleshooting becomes necessary, follow these guidelines:
Matrix Bay Checkout
Indication Resolution
Main power switch is ON, but the Power LED
indicator is not lit
Check the main line fuse on the rear of the main bay. Refer to
the Maintenance Information, page 103 for replacement
instructions.
Any of the green LED indicators on the front of
the matrix bay power supply are not illuminated
Replace the blown fuses associated with any unit fuse
indicators.
Intermittent video output or system operation Verify that all circuit card modules are properly seated in their
respective rack connectors.
Power Supply LEDs are lit, but there is no
power indication on modules or accessory
devices
Verify proper seating of the power supply within card cage.
Verify that the supplied retaining screws are installed.
Keyboard Checkout
There are no keyboard display indicators Check the interconnect cable for cut or broken wires between
the keyboard and the main CPU bay. Replace the cable if
necessary. Relocate the keyboard connector on the main CPU
bay to another keyboard input port. Replace the keyboard.
Keyboard indicators are lit but the keyboard is
inoperative
Verify that the keyboard is logged-on to the system (if log-on
feature has been enabled). Check the interconnect cable for cut
or broken wires between the keyboard and the main CPU bay.
Replace the cable if necessary. Relocate the keyboard connector
on the main CPU bay to another keyboard input port. Replace
the keyboard.
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100 en | Troubleshooting Guide LTC 8900 Series
2016.04 | 10.7 | F.01U.323.096 Installation Manual Bosch Security Systems, Inc.