Bosch Appliances 8555 TROUBLESHOOTING 9.1 General, Problem, Possible Causes, No Power Indication

LTC 8555 Series Instruction Manual Troubleshooting EN 28

9TROUBLESHOOTING

9.1 General

PROBLEM	Possible Causes
No Power Indication	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.
LED Displaying flashing dashes	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.
Non-operating Key or LED digit	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.
Camera and Monitor numbers being displayed, but	a)	Verify that the attempted function is applicable to the device
Allegiant system will not respond to changes or		being controlled, or the switcher’s current situation.
P/T/Z controls	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.
Intermittent beeping and/or display of error message	a)	Error 90, Error 92, and Error 94 indicate the Allegiant
90, 92, 94, or 95.		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.

Bosch Security Systems 29 August 2003