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KX-DT543RU, KX-DT546RU - Panasonic PBX Service Manual Supplement (repair manual). Page 17

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17
2.7.
Headset Does Not Work
2.7.1.
Receive
Check the soldering.
Resolder or replace parts as needed.
Related parts: IC410,C577,L462
NO
Confirm the waveform of dial tone at 
TP:HESSPOUT when you press the speaker button
.
Can you see the waveform of dial tone?
YES
Related parts: 
[Ope PCB]
JK160
Headset
NO
YES
Can you hear dial tone from headset speaker?
END
Related parts: 
[Main PCB] CN400,
[Ope PCB]
CN160,C158,C159,C169,C168,
 L161,D161
Flat Cable (Between Main  PCB and Ope PCB)
NO
Confirm the waveform of dial tone at Pin 5 of 
JK160 
when you press the speaker button.
Can you see the waveform of dial tone?
YES
Insert a headset
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