Panasonic KX-FT21RS - Manual (Page 97)

6 CIRCUIT OPERATIONS
6.1. CONNECTION DIAGRAM
+24V
+24V
+24V
GND
GND
GND
+5V
NC
COM
LATCH
STB1
GND
VDD
TH
CLOCK
GND
STR2
SI
COM
A
B
NA
NB
CO
MOTOR
SENSOR
V.LED
G.LED
CLK
GND
GND
GND
ST
SEL
+5V
SIG
CIS
+24V
D-GND
+5VD
+5VA
A-GND
BELL
EX-HOOK
RELAY
PAPER
RX
JACK
JACK
VSS
VDD
VO
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
NC
+5V
FG
OPESE
RS
E
KIN0
KIN1
KIN2
KIN3
KSTAR
KSCLK
KLATC
KTXD
KRXD
DG
NC
PO
WER SUPPL
Y
BO
AD
THERMAL HEAD
DIGITAL
BOARD
ANALOG
BOARD
OPERA
TION
P
ANEL
SPEAKER
HANDSET
LCD
TO TEL LINE
TO EX TEL
1
2
3
4
5
6
1
2
3
4
5
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
1
2
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
11
1
2
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
10
9
8
7
6
5
4
3
2
1
6
5
4
3
2
1
CN1
CN102 CN9
TX
HOOK-IN
SP-MUTE
BREAK
DTMF-IMP
P-SHORT
HS-ALC
HS-TX
SP-OUT
HS-RX
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
CN202 CN10
CN3
CN5
CN6
CN7
CN2
CN1 CN3
CN201
CN1
CN2
CN8
CN4
CN101
SP+
SP-
97
KX-FT21RS