Panasonic KX-DT543RU / KX-DT546RU Service Manual ▷ View online
13
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
4.2.8.
Key Circuit
The key detection is under the matrix control by IC150.
The HOOK key is independent from Key Scan Matrix and taken into the port singularly.
KEY Input control timing chart
KEYIN pins have a internal pull-down resistor.
KEYIN pins have a internal pull-down resistor.
If KEY is pushed, high level is latched by connecting STB(output high) and KEYIN. If not, low level is latched.
The value is fixed by reading twice.
The value is fixed by reading twice.
once
twice
"7"(SW44) is fixed.
KEY_CLK
(IC150 Internal)
(IC150 Internal)
LED_STB0
(IC150 pin24)
(IC150 pin24)
"7"
(SW44)
(SW44)
LED_STB1
(IC150 pin25)
(IC150 pin25)
LED_STB2
(IC150 pin26)
(IC150 pin26)
LED_STB3
(IC150 pin27)
(IC150 pin27)
LED_STB4
(IC150 pin28)
(IC150 pin28)
LED_STB5
(IC150 pin29)
(IC150 pin29)
LED_STB6
(IC150 pin30)
(IC150 pin30)
LED_STB7
(IC150 pin31)
(IC150 pin31)
KEYIN1
(IC150 pin11)
(IC150 pin11)
When "LED_STB1" is high status
and the "7" button pressed,
the key-in information is read.
and the "7" button pressed,
the key-in information is read.
"7"(SW44) button is pressed.
14
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
4.2.9.
LED Circuit
The lighting of the LEDs is controlled by IC150.
Ringer LEDs are static lighting system.
Other LEDs light up in a dynamic lighting system.
The duty ratio is 1/10 (ON time 1.28ms).
Ringer LEDs are static lighting system.
Other LEDs light up in a dynamic lighting system.
The duty ratio is 1/10 (ON time 1.28ms).
15
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
LED dynamic control timing chart
LED lights with 3.3V created by the STB pin of the High output and Transistor Collector pin of the Low output.
LED lights with 3.3V created by the STB pin of the High output and Transistor Collector pin of the Low output.
4.2.10.
EHS Circuit
EHS is controlled by IC150.
The audio signals are exchanged with IC300 through HANDSET JACK(JK501).
The audio signals are exchanged with IC300 through HANDSET JACK(JK501).
12.6ms
LED_STB2
Q110C
Q111C
Q112C
Q113C
Q117C
CO3(Red)
lighting
lighting
CO5(Red)
lighting
lighting
CO10(Red)
lighting
lighting
CO11(Red)
lighting
lighting
CO14(Red)
lighting
lighting
1.28ms
0.1ms
䞉
䞉
䞉
䞉
䞉
䞉
䞉
16
KX-DT543RU/KX-DT543RU-B/KX-DT546RU/KX-DT546RU-B
4.2.11.
Power Supply Circuit
OP
E
DCX
8
1
3.
3V
RJ
1
1
(PBX
f
e
e
d
)
IN
P
U
T
S
peak
er
40
PG
DG
ASI
C
2
EH
S
LE
D
KEY
RJ
1
1
(DX
DP
feed)
40
+
-
PG
DCD
C
V
CC3
3
DG
1.2V
1.
8V
V
CCA
3
3
V
DD3
3
AG
N
D
LC
D
B
O
X
4.5V
HE
A
D
G
N
D
3.3V
_L
ASI
C
1
Da
ta
C
o
m
m
uni
c
a
tion
LD
O
A
nal
og P
a
rt
Di
g
it
a
l P
a
rt
A
m
p
lif
ie
r
Fla
s
h
APU
L
D
O
LC
D
LCD
B
a
c
k
light
MI
C
B
IA
S
MI
C
H
ands
et
H
eads
et
EH
S
A
nal
og C
ir
c
ui
t
Click on the first or last page to see other KX-DT543RU / KX-DT546RU service manuals if exist.