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Fixing Problems
155
Fixing Problems
Telephone Maintenance
• Always use a damp or antistatic cloth to clean the telephone. Never use a dry cloth.
• If the telephone is very dirty, clean it with a diluted neutral cleaner containing sur-
factants, such as a dish detergent. Afterwards remove all traces of the cleaner with a
damp cloth (using water only).
• Never use cleaners containing alcohol, cleaners that corrode plastic, or abrasive pow-
ders.
Echo Effect
Echoes can occur - sometimes quite distinctly - in the course of a telephone call (HFA only).
This effect is not caused by a product or design fault in your telephone but rather by the other
party's telephone.
Troubleshooting
Pressed key does not respond:
Check whether the key is stuck.
Telephone does not ring:
Check whether the do not disturb function was activated on your telephone (" Do not disturb"
appears on the screen). If so, deactivate it
You cannot dial an external number:
Check whether you telephone is locked ("Access denied" appears on the screen). If so, un-
lock the telephone
No LDAP or WAP functionality, lamps (key LEDs) do not shine or the external keyboard
has no function:
Check whether the plug-in power supply unit is plugged in (except connection by HFA with
"power over LAN").
To correct any other problem:
First contact service personnel. If service personnel is unable to correct the problem, contact
Customer Service.