Read Panasonic KX-DT521RU Service Manual Supplement online
9
Table-2 : Boot ROM Error in IC410
Related parts: IC410,X410,R412,R413,C440,C441
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: L410,C413,C406,C407,
C410,C431,IC410
NO
YES
Confirm the voltage at TP:1.2V.
Is it about 1.2V?
Is it about 1.2V?
Related parts: IC410,C404,C405
NO
YES
Confirm the voltage at TP:V1.8.
Is it about 1.8V?
Is it about 1.8V?
NO
Confirm the frequency of clock signal at Pin 45 of
IC410. Is it 13.824MHz?
IC410. Is it 13.824MHz?
Refer to the waveform (1).
END
Confirm the voltage at Pin14,15,17,67,92 of
IC410 (1.2V input pin).
Is it about 1.2V?
Related parts: C406,C407,R464,R465,
C410,C431,IC410,C450,
C560-562,IC410
YES
Confirm the voltage at Pin 19 of IC410 (VCC33).
Is it about 3.3V?
Is it about 3.3V?
YES
NO
Related parts: L222
NO
C241
C24
3
C201
1 CLKIN
12
KEYIN2
13
KEYIN3
23
LED_COM3
34
LED_COM
6
14
KEYIN4
15
KEYIN5
16
KEYIN6
17
KEYIN7
18
VSS2
19
VDD2
20
LED_COM
0
21
LED_COM
1
22
LED_COM
2
24
LED_STB0
25
LED_STB1
26
LED_STB2
27
LED_STB3
28
LED_STB4
29
LED_STB5
30
LED_STB6
31
LED_STB7
32
LED_COM4
33
LED_COM5
35
LED_COM
7
3
6
VDD3
3
7
VSS
3
3
8
INT_OUT0
3
9
INT_OUT
1
4
0
TEST
41
RESE
T
42
SCS
43
SCLK
44
SDI
2 CLKOUT
3 VDD1
4 VSS1
5 SDO
6 GKEYIN0
7 GKEYIN1
8 PSBIN
9 PSBOUT
10 KEYIN0
11 KEYIN1
C21
1
C213
R25
6
DG
KEYs and LEDs Circuit
L211
INT0
ASIC_RST
ASIC_RST
I2C_SCL
I2C_SDA
ASIC_CLK
R261
L213
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CL207
CN205
C204
C202
C206
D201
DG
DG
AGND
IC205
Ope PCB side
1
14
13
12
11
10
9
8
7
6
5
4
3
2
CN400
DG
DG AGND
IC410
IC300
DCX81
R
323
R563
R324 C383
R454
R453
R452
R
472
R
456
R
455
R334
X301
R454
R453
R452
C568
C382
DG
Main PCB side
[Related Circuit]
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