Panasonic KX-DT521RU Service Manual / Supplement ▷ View online
17
2.7.
Headset Does Not Work
2.7.1.
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]
JK202
Headset
NO
YES
Can you hear dial tone from headset speaker?
END
Related parts:
[Main PCB] CN400,
[Ope PCB]
[Ope PCB]
CN205,C217,C218,L210,D247
Flat Cable (Between Main PCB and Ope PCB)
NO
Confirm the waveform of dial tone at Pin 5 of
JK202
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
18
2.7.2.
Send
2.8.
Speaker-Phone/Ringer Does Not Work
2.8.1.
Receive / Ringer
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]
CN205,C205,L209,D246,C226
Flat Cable (Between Main PCB and Ope PCB)
NO
YES
Confirm the voltage between TP:HESMIN and
TP:DG_A.
Is it about 2.4V?
TP:DG_A.
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:DG_A during a call.
Can you see the waveform of sending sound?
heaset microphone between TP:HESMIN and
TP:DG_A during a call.
Can you see the waveform of sending sound?
Insert a headset
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: IC410,C500,C501,
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
19
2.8.2.
Send
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:DG_A.
Is it about 1.9V?
TP:DG_A.
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?
20
2.9.
LED Does Not Light
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts:
IC205,D234,R209,RA205,RA202,
and Jumper chip
NO
Does SP-PHONE_LED light?
YES
Related parts:
IC205,R202,D249,
and Jumper chip
NO
Does RINGER LED(RED) light?
YES
Related parts:
IC205,R203,D248,Q204,R255,
and Jumper chip
NO
Does RINGER LED(GREEN) light?
YES
Related parts:
IC205,D227,R208,R209,RA205,
RA202,
and Jumper chip
NO
Does CO01 LED (flexible Button) light?
YES
Related parts:
IC205,D226,R210,R211,RA205,
R206,
and Jumper chip
NO
Does
CO08
LED (flexible Button) light?
YES
END
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