Read Panasonic KX-DT521RU Service Manual online
6
KX-DT521RU/KX-DT521RU-B
4 Technical Descriptions
4.1.
Block Diagram
C
N
400
CN2
0
5
H
eads
et J
A
C
K
KEY
IN
0-5
ASI
C
2
IC
2
0
5
SC
L
SD
A
INT
RS
T
( H
e
ads
et D
E
T
)
3.
3V
T
o
W
ir
ed H
eads
et
H
EAD
SET
M
IC
HE
A
D
S
P
LED
_ST
B0-7
LED
_C
OM
0-5
8
6
6
H
OOK
Ho
o
k S
W
CO
L
E
D 8
x
2
F
u
nc
tion LE
D
4
Nu
m
K
e
y
1
2
CO
K
e
y
8
F
u
nc
tion K
e
y
15
DG
3.
3V
I2
C
Q204
JK
202
CN4
6
0
Q3
0
1
PD
X
0
PD
X
1
PD
R
T
300
DDX
0
DDX
1
DDR
VD
D
3
3
X
301
16.
384M
D
C
X
8
1
I
C
4
1
0
X
410
13.824M
SP
MI
C
S
PP /
S
P
N
MI
C
P
/
MI
C
N
SP
MI
C
H
ands
et J
A
C
K
HS
S
P
O
U
T
P
HS
M
ICI
NP
/
HS
M
ICI
NN
1.
2V
Se
ri
a
l
Fl
a
s
h
IC
401
QS
P
I
D0
D3
CS
S#
SP
IM
A0
DO
CL
K
CS
RS
T
W
h
it
e Bac
k
-light
V
CC3
3
/V
C
CA
3
3
VC
C
3
3
VC
C
3
3
SP
I2
PC
M
(I
P
IN
T
)
DI
DO
CL
K
CS
TX
D
RX
D
FS
Y
N
C
SC
LK
IN
T
N
RS
T
LC
D
_
P
W
R
To
P
B
X
To
TE
L
JK
3
0
0
JK
301
D3
0
0
DP
T
i/
f
CO
M
P
Q3
3
1
Q3
3
2
CO
M
P
PC
M
i/
f
SPI
2
i/
f
PBX
i/
f
Po
w
e
r
IC
510
L309
Q303
Q
304
GPI
O i/
f
DG
VC
C
A
3
3
VC
C
3
3
DG
ASI
C
1
I
C
3
0
0
JK
5
0
1
H
ands
et
3.3V
CK
4
M
4.
5V
L
CD_
B
L
DG
3.3V
VC
C
3
3
Q460
1-
line LC
D
Ma
in
P
C
B
Op
e
P
C
B
Click on the first or last page to see other KX-DT521RU service manuals if exist.