Panasonic KX-FT21BX

CIRCUIT OPERATIONS
- 109 -
KX-FT21LA
+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
DG
+5VD
+5VA
AG
BELL
EXHOOK
RLY
PAPER
RX
TX
HOOK
SPMUTE
H/STX
SPOUT
H/SRX
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
POWER SUPPLY BOAD
THERMAL HEAD
DIGITAL
BOARD
ANALOG
BOARD
OPERATION PANEL
SPEAKER
LCD
TO TEL LINE
TO EXT.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
11
1
2
3
4
5
6
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
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
11
10
9
8
7
6
5
4
3
2
1
6
5
4
3
2
1
12
13
14
15
16
CN1
CN1
CN2
CN3
CN5
CN6
CN7
CN2
CN1
CN3
CN3
CN4
CN5
CN8
CN4
CN2
SP+
SP-
1. CONNECTION DIAGRAM