Panasonic KX-TGU430 Basic Operating Instructions Manual page 26

Useful Information
Question
26
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Cause/solution
7
Clean your telephone base and handset.
a. Unplug your telephone from the power
outlet and telephone line cord.
b. Clean the charge contacts of the handset,
base unit, and charger using a damp cloth
to remove any dirt, dust, or debris.
c. Clean the speaker and microphone part of
the handset using a damp cloth to remove
any dirt, dust, or debris.
d. Plug your telephone back into the power
outlet and telephone line cord.