Panasonic KX-DT543RU / KX-DT546RU Service Manual ▷ View online
29
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-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.
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.
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?
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
30
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.6.2.
Send
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: Handset,Curl cord,JK501,L463,
L464,R520,R517,R518,C513,
C514,R515,R516,IC410
C514,R515,R516,IC410
NO
END
Related parts: C513,R517,R564,R519,C518,
C570,L463,JK501
NO
YES
Confirm the voltage between TP:HSMIP and
TP:UART_GND.
Is it about 2.0V?
TP:UART_GND.
Is it about 2.0V?
Related parts: IC410,C442,R238,C443
NO
YES
Confirm the voltage between either end of
C443 (MICBIAS).
Is it about 2.5V?
YES
Confirm the waveform of sending sound from
handset microphone between TP:HSMIP and
TP:HSMIN during a call.
Can you see the waveform of sending sound?
handset microphone between TP:HSMIP and
TP:HSMIN during a call.
Can you see the waveform of sending sound?
Confirm the voltage between Pin 6 of
IC150
and AG.
Is it about 2.3V?
NO
Related parts:
IC150,R161,L163,D163,JK160
YES
31
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.7.
Headset Does Not Work
8.7.1.
Receive
Check the soldering.
Resolder or replace parts as needed.
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
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]
[Ope PCB]
CN160,C158,C159,C169,C168,
L161,D161
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?
Can you see the waveform of dial tone?
YES
Insert a headset
32
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.7.2.
Send
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts:
[Main PCB] R570,C581,IC410
Headset
NO
END
Related parts:
[Main PCB] CN400,L461,C576,R566,R569,
C571,C580
[Ope PCB]
CN160,C166,L160,D162,C165
Flat Cable (Between Main PCB and Ope PCB)
NO
YES
Confirm the voltage between TP:HESMIN and
TP:UART_GND.
Is it about 2.4V?
TP:UART_GND.
Is it about 2.4V?
Related parts: IC410,C442,R238,C443
NO
YES
Confirm the voltage between either end of
C443 (MICBIAS).
Is it about 2.5V?
YES
Confirm the waveform of sending sound from
heaset microphone between TP:HESMIN and
TP:UART_GND during a call.
Can you see the waveform of sending sound?
heaset microphone between TP:HESMIN and
TP:UART_GND during a call.
Can you see the waveform of sending sound?
Insert a headset
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