Check Tam Operation Part - Panasonic KX-PRX120W Service Manual

9.1.7.

Check TAM Operation Part

Is there a TAM icon on the Handset display?
YES
Is the voltage of VDD3 of Base Unit about 2.85 V
and VDD1 about 1.8 V, VDD4 about 3.0 V, VDD5
about 3.0 V?
YES
Check IC421 and BBIC (IC7) of Base Unit. (*1)
Cross Reference:
Power Supply Circuit (P.9)
Note:
(*1) When replacing FLASH MEMORY (IC421), TAM data need to be written to it. Refer to Base Unit of Things to Do after
Replacing IC or X'tal (P.50)
NO
Turn on the Answering System.
NO
Check Power Supply Circuit.
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KX-PRX120W/KX-PRXA10W