9
TROUBLESHOOTING
9.1 General
LTC 8555 Series |
Instruction Manual
|
Troubleshooting
EN
| 28
Bosch Security Systems | 29 August 2003
PROBLEM
No Power Indication
LED Displaying flashing dashes
Non-operating Key or LED digit
Camera and Monitor numbers being displayed, but
Allegiant system will not respond to changes or
P/T/Z controls
Intermittent beeping and/or display of error message
90, 92, 94, or 95.
Possible Causes
a) If powered from a non-modular type Allegiant, try another
keyboard port on the Allegiant. The port may have failed.
b) If powered from a modular type Allegiant, check the fuse on
main Allegiant power supply. Try another keyboard port.
c) If powered from a separate power source, check power
source or main AC supply of power source.
d) If power source is confirmed to be OK, the keyboard may
have an internal failure. Swap suspect keyboard with a
known good keyboard.
a) If the login feature is enabled, the keyboard may be logged
off. (User LED lit and OFF LED lit)
b) If the login feature is not enabled, or the keyboard port is
logged in, there is likely a data communication error. Test the
keyboard cable in another keyboard port. Swap the suspect
keyboard with a known good keyboard. Try another
keyboard data cable. Check keyboard data cable
connections.
c) If using RS-232 protocol models with a dial-up modem link,
the keyboard may be waiting for the operator to dial a phone
number and establish communication with the Allegiant.
a) If a key does not seem to be working, verify that the
attempted function is applicable to the device being
controlled, or the switcher’s current situation.
b) Key or LED may be defective. Run the User Function 1 test
described in section below.
a) Verify that the attempted function is applicable to the device
being controlled, or the switcher’s current situation.
b) If using a directly connected cable, the keyboard port or
keyboard could be defective. Swap the suspect keyboard
with a known good keyboard.
c) If using a communication link other than a directly
connected cable, there could be a problem with the
communication link. Data is being received from the
Allegiant if camera and monitor numbers are displayed, but
these symptoms indicate that the keyboard’s data is not
getting back to the Allegiant. Test with a directly connected
Allegiant keyboard cable. Verify that the communication link
is compatible with Allegiant keyboard data communications.
a) Error 90, Error 92, and Error 94 indicate the Allegiant
system has received invalid data. The most likely cause is
excessive EMI interference on the keyboard data cable,
within the keyboard itself, or possibly in the Allegiant
system. If the keyboard is remoted a long distance, try using
the 3 m (10 ft) data cable supplied with the keyboard.
b) Error 95 indicates that there is intermittent keyboard
communication. Verify the physical data cable connections
and the integrity of the cable connectors.
