Read Panasonic KX-DT521RU Service Manual Supplement online
10
Table-3 : Flash ROM(IC401) Data Error / DSP Data Error
Check the soldering.
Resolder or replace parts as needed.
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?
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)
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.
between IC401 and IC410.
Refer to the waveform (3).
END
DG
VCC33
DG
IC410
C400
C559
R
400
R
401
R
402
R
403
R
404
R
405
R
406
C
490
C
491
R
407
R
408
R
409
IC401
108
107
105
104
107
105
104
1
2
2
C
DQ1
DQ3
DQ3
S#
DQ2
DQ0
DQ0
C
DQ
1
DQ
3
S#
DQ
2
DQ
0
1
2
3
4
8
7
6
5
*CS
IO1
IO2
GND
VCC
IO3
CLK
IO0
DCX81
[Related Circuit]
VCC33
QVCC
106
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