21. Cleaning
Before cleaning, please pull the mains adapter out of
the socket. Use a soft, dry cloth to clean the device.
Do not use chemical solutions or cleaning agents be-
cause these may damage the device's surface or the
labels on it.
22. Troubleshooting
Problem
The device
cannot be
switched
on.
102
Possible
cause
•
The batteries
may be dead.
•
The mains
adapter is not
connected
properly.
Remedy
• Operate the de-
vice using the bat-
teries, check that
they are correct-
ly inserted and
charged.
• Ensure that the
mains cable is
properly connect-
ed.