Panasonic KX-DT543-B Service Manual page 24

KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
Table-3 : Flash ROM(IC401) Data Error / DSP Data Error
Confirm the voltage at Pin 8 of IC401 (VCC33) and
Pin 106 of IC410.
Are they about 3.3V?
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
Confirm the waveform of communication
between IC401 and IC410.
Refer to the waveform (3).
YES
[Related Circuit]
END
VCC33
C400
C559
1
*CS
VCC
IC401
2
IO1
3
IO2
CLK
4
GND
DG
Check the soldering.
Resolder or replace parts as needed.
NO
Related parts: C400,C559,IC401,IC410,L222
NO
Related parts: IC410,R408
NO
Related parts: IC410,IC401,R404,R405,R406,
8
7
IO3
6
C
5 DQ1
IO0
DQ3
S#
DQ2
DQ0
DG
24
R407,R408,R409,C400,C559
VCC33
QVCC
DCX81
106
108
107
IC410
105
104
1
2