Panasonic KX-DT543RU / KX-DT546RU Service Manual / Supplement ▷ View online
13
2.3.
LCD Does Not Operate
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: CN460,D460,C460-462,C464
NO
YES
Confirm the voltage at Pin7 of CN460.
Is it about 3.3V?
Is it about 3.3V?
Related parts:C465,C466,C467
Related parts: L460,R435
NO
NO
Confirm the voltage between Pin 12 and Pin 13 of
CN460.
Is it about following voltage?
CN460.
Is it about following voltage?
Note)
"LCD contrast" must be default setting (Level 3).
"LCD contrast" must be default setting (Level 3).
YES
Related parts:CN460,R434,R436
NO
YES
Confirm the waveform SCLK at TP:SPI_CLK.
Refer to the waveform (13).
Related parts:LCD module,CN460
NO
YES
Confirm the waveform at Pin 3, 4, 5 and 6 of CN460.
Refer to the waveform (14),(15).
YES
END
Confirm the LCD display.
Is it working?
Is it working?
[DT546]:13.8V / [DT543]:10.0V
14
2.4.
DXDP Does Not Work
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: Q330,R345,R346,R347,C331,
C332,L303,L304,JK301,Q303,
Q304,R319,R320,C325,R321,
R322
Q304,R319,R320,C325,R321,
R322
NO
Connect DPT to DXDP port.
Related parts:
Related parts:
NO
YES
Confirm the waveform of transmitting signals
to DPT connected to DXDP port.
to DPT connected to DXDP port.
Refer to the waveform (17).
END
Confirm the voltage at Pin 4 of Q332 (VDD33).
Is it about 3.3V?
Is it about 3.3V?
NO
Related parts: L221
Confirm the voltage between TP:H-D and TP:L-D.
Is it between 15V and 40V?
Is it between 15V and 40V?
Confirm the waveform of receiving signals
from DPT connected to DXDP port.
from DPT connected to DXDP port.
Refer to the waveform (16).
C337,C333,R348,R349,D533,
R350-355,C335,C336
Q331,R340-343,D532,C330,
C331,Q332,R312,R313,C312,
C313,D533,R348,R349,C333,
C337
C313,D533,R348,R349,C333,
C337
NO
YES
YES
15
2.5.
Audio Problem
2.6.
Handset Does Not Work
2.6.1.
Receive
Related parts: R427,C418,C419,C421,C455,
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
See 9.6.1
See 9.6.2
See 9.6.3
Handset problem ?
END
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, Handset,Curl cord
NO
YES
Can you hear dial tone from handset speaker?
END
16
2.6.2.
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:DG_A.
Is it about 2.0V?
TP:DG_A.
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
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