Panasonic KX-DT543 - Audio Performance Problems; Handset Functionality

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KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
8.5. Audio Problem
8.6. Handset Does Not Work
8.6.1. Receive
Related parts: R427,C418,C419,C421,C455,
R557,C420,C453,L220
NO
Confirm the voltage at Pin 31 and Pin 39 of
IC410 (VCCA33).
Is it about 3.3V?
YES
Check the soldering.
Resolder or replace parts as needed.
Headset problem ?
SP phone or Ringer problem ?
YES
YES
YES
NO
NO
NO
Handset problem ?
END
See 8.6
See 8.7
See 8.8
Check the soldering.
Resolder or replace parts as needed.
Related parts: IC410,C519,C520,L465,C525
NO
Confirm the waveform of dial tone at TP:HSSPOUT
while you leave a phone off the hook.
Can you see the waveform of dial tone?
YES
Related parts: JK501,R568,Handset,Curl cord
NO
YES
Can you hear dial tone from handset speaker?
END