Troubleshooting; General - Bosch LTC 8555/00 Instruction Manual

30 en | Troubleshooting
9

Troubleshooting

9.1

General

Problem
No Power Indication
LED Displaying Flashing dashes
Non-operating Key or LED Digit
F.01U.127.290 | 2.0 | 2009.03
Possible Causes
– If powered from a non-modular type Allegiant, try another
keyboard port on the Allegiant. The port may have failed.
– If powered from a modular type Allegiant, check the fuse on
main Allegiant power supply. Try another keyboard port.
– If powered from a separate power source, check power source
or main AC supply of power source.
– If power source is confirmed to be OK, the keyboard may have
an internal failure. Swap suspect keyboard with a known good
keyboard.
– If the login feature is enabled, the keyboard may be logged off.
(User LED lit and OFF LED lit)
– 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.
– 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.
– 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.
– Key or LED may be defective. Run the User Function 1 test
described in section below.
Instruction Manual
Allegiant Keyboards
Bosch Security Systems, Inc.