Panasonic KX-DT346UA Service Manual ▷ View online
5
KX-DT346UA/KX-DT346UA-B
3 Specifications
3.1.
General Descriptions
Design and specifications are subject to change without notice.
Station Loop Limit:
90 ohms
Calling Method:
2 pair wire
Jacks:
Handset Jack, TEL Jack, Headset Jack
Dimensions:
Low Angle:
253 (D)mm [Operate]
× 202 (W)mm × 129 (H)mm
(9
31
/
32
”
× 7
15
/
16
”
× 5
8
/
32
” )
High Angle:
201 (D)mm [Operate]
× 202 (W)mm × 224 (H)mm
(7
29
/
32
”
× 7
15
/
16
”
× 8
13
/
16
” )
Weight:
1. 27 kg (2. 79 lb)
6
KX-DT346UA/KX-DT346UA-B
4 Technical Descriptions
4.1.
Block Diagram
GN
D
-1
.2
V
GN
D
R6
-1
C
10-1
D7
-0
A6-0
WE
N
RE
N
INT
IN
PD
X
0
PD
X
1
PD
R
Nu
m
K
e
y
1
2
CO
K
e
y
2
4
F
unc
ti
on K
e
y
6
+3
.3
V
GN
D
JK
1
CP
U I
C
1
C
2
C
B
H
F
000481
64pin
R
ESET
OU
T
2
CN3
T
o12 C
O
Opt
ion
MA
IN
P
C
B
Opt
ion i/
f
LED
i/
f
CP
U i
/f
DS
P
D
TMF
G
e
n
.
T
O
NE
G
e
n
.
T
O
NE
De
t.
2c
h
CO
DE
C
IC
6
C
1
C
B
0000
1408
C
O
LE
D
24x
2
F
unc
ti
on LE
D
6
LE
D
's
dr
iv
er
8
X1
16.
384M
H
z
+3
.3
V
H
OOK
SW
A
S
IC
I
C
2 C
1
C
B
00002988 100pi
n
BKLI
T
PO
W
E
R
IC
5
PC
M
i/
f
Q
601
D1
T1
T
xD,RxD,S
CL
K
, RxRDY
Q1
Q3,
4
Analog SW
I
C
8
M
e
s
s
age
LE
D
3
EC
H
O
C
han.
DDX
0
DDX
1
DDR
CL
K
DA
T
A
CS
IC
9
C
har
ge
Pu
m
p
G
A
IN Cn
t.
CO
M
P
JK
2
Q6
Serial
Pas
s
Sw
ic
h
16
CN4
CN
602
2pi
n
CN
604
22pi
n
BK LI
T
LC
D
SP
MI
C
SP
MI
C
1
4
To
H
ands
et
JK
4
To
P
B
X
To
TE
L
CN6
16pi
n
To
U
S
B
Op
ti
o
n
F
las
h R
O
M
64k
By
te
RA
M
3k
By
te
SP Am
p I
C
7
SP Am
p
5
7
2
PBX
i/
f
DP
T
i/
f
GN
D
CS
18
10
KEY
IN
7
-0
KEY
OU
T
6
-0
16
R
ESET
R
ESET
IC
3
Da
ta
Fl
a
s
h
2k
By
te
T2
So
ft
Ke
y
4
+3
.3
V
3
GN
D
4
CN5
12pi
n
+3
.3
V
3
3
3
T
xD,RxD,S
CL
K
, RxRDY
SP
MI
C
JK
5
To
H
eads
et
CN
603
20pi
n
CN1
CN
601
30pi
n
6-
Li
ne LC
D
P
C
B
CN2
CN7
6pi
n
CS
,RE
S
,A
0
,S
CK
,DA
P
IO
0
-3
,T
x,Rx,RT
S
,CT
S
+3
.3
V
8
5
S
Y
NC,O
UT
,IN,CL
K
,
R
ESET
OU
T
3
3
2
Q2
CO
M
P
S
CI3
S
CI2
S
CI1
4
3
To
Bluet
oot
h
Opt
ion
R
ESET
OU
T
1
1
O
S
X
,O
S
R,O
S
Y
NC,O
CK
2
M
4
4
KX-DT346UA/KX-DT346UA-B Block Diagram
7
KX-DT346UA/KX-DT346UA-B
4.2.
Circuit Operations
4.2.1.
Key Input Control Circuit
The key data is under the matrix control by 31 to 34, 50 to 52(KEYOUT) and 1, 2, 42 to 45, 63, 64(KEYIN) of IC1.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.
The Hook key is independent from key scan matrix and taken into the port singularly.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.
The Hook key is independent from key scan matrix and taken into the port singularly.
8
KX-DT346UA/KX-DT346UA-B
4.2.2.
LCD Circuit
LCD data are outputted from pin 37, 38, 39, 53, 54 of IC1 to LCD module.
IC9 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
IC9 is an inverter for a charge pump circuit which outputs the voltage necessary for LCD driving.
• 4.5V from -1.2V generated at IC9 as a reference to +3.3V of the power supply voltage is pressurized four times in the LCD mod-
ule and used as LCD driving voltage (approx. 18V).
LCD contrast is set by electronic volume in the LCD module.
The type of the LCD module is distinguished by pin 38 of IC1.
KX-DT346 uses a 24 digits x 6 Lines LCD.
The type of the LCD module is distinguished by pin 38 of IC1.
KX-DT346 uses a 24 digits x 6 Lines LCD.
The lighting of the backlight is controlled by Q601.
• IC1-pin 35 H
→Q601-ON→Backlight ON
• IC1-pin 35 L
→Q601-OFF→Backlight OFF
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