Read Panasonic KX-FC962RU-T / KX-FC962UA-T Service Manual online
7.14. HOW TO CHECK THE CORDLESS HANDSET RECEIVER
1. Prepare the digital voltmeter, and set the selector knob to ohm meter.
2. Put the probes at the receiver terminals as shown below.
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KX-FC962RU-T / KX-FC962UA-T