– Disconnect the power cord from the power source.
2
– Check for damage or contamination, including any bent pins on the electrical connector.
3
– Use a soft cloth dampened with glass cleaner or 70% alcohol-to-water solution to clean all parts of the handset, except the electrical connector. Use great care when cleaning
the electrical contact pins of the connector. Carefully clean the contact pins with glass cleaner or 70% alcohol-to-water solution using a cotton swab. Compressed air may be used
to dry or remove debris from the electrical connector.