Panasonic KX-DT543 - Page 24

24
KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
Table-3 : Flash ROM(IC401) Data Error / DSP Data Error
Check the soldering.
Resolder or replace parts as needed.
Related parts: C400,C559,IC401,IC410,L222
NO
Confirm the voltage at Pin 8 of IC401 (VCC33) and
Pin 106 of IC410.
Are they about 3.3V?
Related parts: IC410,R408
NO
YES
Confirm the frequency of clock signal at Pin 6 of
IC401. Is it 103.68MHz?
(This clock is NOT continuous)
Refer to the waveform (2).
YES
Related parts: IC410,IC401,R404,R405,R406,
R407,R408,R409,C400,C559
NO
YES
Confirm the waveform of communication
between IC401 and IC410.
Refer to the waveform (3).
END
DG
VCC33
DG
IC410
C400
C559
R400 R401 R402
R403 R404
R405 R406
C490
C491
R407 R408 R409
IC401
108
107
105
104
1
2
C
DQ1
DQ3
S#
DQ2
DQ0
C
DQ1
DQ3
S#
DQ2
DQ0
1
2
3
4
8
7
6
5
*CS
IO1
IO2
GND
VCC
IO3
CLK
IO0
DCX81
[Related Circuit]
VCC33
QVCC
106