Panasonic KX-DT543RU / KX-DT546RU Service Manual ▷ View online
33
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.8.
Speaker-Phone/Ringer Does Not Work
8.8.1.
Receive / Ringer
8.8.2.
Send
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: IC410,C500,C501,R501,R502,
C502,C506,C504
NO
Confirm the waveform of dial tone between TP:SPP
and TP:SPN, when you press the speaker button.
(Speaker-phone mode).
Can you see the waveform of dial tone?
and TP:SPN, when you press the speaker button.
(Speaker-phone mode).
Can you see the waveform of dial tone?
YES
Related parts: Speaker,Speaker-cable
NO
YES
Can you hear dial tone from Speaker-phone
speaker?
speaker?
END
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: [Main PCB] R535,R533,R532,
C540,C541,R530,R531,C530,
IC410
IC410
[mini PCB for microphone]
R1,R2, MIC1
NO
END
Related parts: C540,R532,R565,R534,C569
NO
YES
Confirm the voltage between TP:MIP and
TP:UART_GND.
Is it about 1.9V?
TP:UART_GND.
Is it about 1.9V?
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
Speaker-phone microphone between TP:MIP and
TP:MIN during a call.
Can you see the waveform of sending sound?
Speaker-phone microphone between TP:MIP and
TP:MIN during a call.
Can you see the waveform of sending sound?
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KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.9.
LED Does Not Light
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts:
IC150,D139,R101,R111,Q117,
cR200, and Jumper hip
cR200, and Jumper hip
NO
Does SP-PHONE_LED light?
YES
Related parts:
IC150,R108,D109, and Jumper chip
NO
Does RINGER LED(RED) light?
YES
Related parts:
IIC150,R109,D108,Q104,R110,
and Jumper chip
and Jumper chip
NO
Does RINGER LED(GREEN) light?
YES
Related parts:
IC150,D117,R100,R101,R111,
Q110,R186,and Jumper chip
Q110,R186,and Jumper chip
NO
Does CO01 LED (flexible Button) light?
YES
Related parts:
IC150,D131,R102,R103,R111,
Q114,R194,and Jumper chip
Q114,R194,and Jumper chip
NO
Does
CO24
LED (flexible Button) light?
YES
END
35
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.10. EHS Does Not Work
8.10.1.
EHS (Plantronics) Does Not Work
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: R181,IC171,R177,Q170,R175,
D171,D172,JK302,
and Jumper chip
and Jumper chip
NO
Mesure the EHSDET voltage at Pin 7 of IC150.
Is it 0V?
Is it 0V?
YES
Related parts: R185,IC173,R170,R171,R172
D170,C170,C171,and Jumper chip
NO
Measure the EHSTX signal between Pin 3 and Pin
4
of JK302.
See the communication waveform.
4
of JK302.
See the communication waveform.
Refer to the waveform (18).
YES
Related parts: R182,Q172,R180,IC172,
R176,Q171,R173,R174,
and Jumper chip
and Jumper chip
NO
Measure the EHSRX signal Pin 8 of IC150.
See the communication waveform.
See the communication waveform.
Refer to the waveform (19).
YES
Related parts: IC150,JK302
NO
Confirm the EHS communication.
Can you use the EHS?
Can you use the EHS?
YES
END
Note: Additional reference : See Table-4
36
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
8.10.2.
EHS (Jabra) Does Not Work
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: R181,IC171,R177,Q170,R175,
D171,D172,JK302,
and Jumper chip
and Jumper chip
NO
Mesure the EHSDET voltage at Pin 7 of IC150.
Is it 0V?
Is it 0V?
YES
Related parts: [Main PCB] R453,R433,IC410
[Ope PCB] R184,Q173,Q174,
R202,R203,R178,IC170,JK302,
CN160 and Jumper chip
Flat Cable (Between Main PCB and Ope PCB)
NO
YES
Related parts: R183,R182,Q172,R180,IC172,
R176,Q171,R170,R171,R172,
R173,R174,C170,C171,D170,
and Jumper chip
R173,R174,C170,C171,D170,
and Jumper chip
NO
Measure the JABRA_URX signal at Pin 10 of
CN160.
See the communication waveform.
CN160.
See the communication waveform.
Refer to the waveform (21).
YES
Related parts: IC150,JK302
NO
Confirm the EHS communication.
Can you use the EHS?
Can you use the EHS?
YES
END
Measure the JABRA_URX signal at Pin 10 of IC410
on Main PCB.
See the communication waveform.
on Main PCB.
See the communication waveform.
Refer to the waveform (21).
YES
NO
Related parts: [Main PCB] R454,CN400
[Ope PCB] CN160, and Jumper chip
Flat Cable (between Main PCB and Ope PCB)
Note: Additional reference : See Table-4
Measure the JABRA_UTX signal between Pin 1
and
and
Pin 4 of JK302.
See the communication waveform.
Refer to the waveform (20).
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