Panasonic KX-TA308 Service Manual page 12

2/4
DISA1
3.58MHz
3.58MHz
IC120
+5V
14
INPUT
Vdd
DTMF RECEIVE
13
0.022
NC
C132 NC
12
EST PD
11
STD3
STD3
STD OSCO
10
ACK3
ACK3
ACK OSCI
9
SD3
SD3
SD NC
8
LOAD Vss
DTMFR3R(DISA)
IC121
+5V
14
INPUT
Vdd
13
0.022
NORMALY
NC
C134 NC
12
EST PD
0V 11
STD4
STD4
STD OSCO
10
ACK4
ACK4
0V ACK OSCI
9
SD4
SD4
SD NC
5V
8
LOAD Vss
DTMFR4(DISA)
DTMFG
BGM
VMDTMF2
VMDTMF1
350Hz
620Hz
IC104
DTMFR2
+5V
14
Vdd
0.022 13
C146 NC
12
EST
11
STD1
STD1
STD
10
ACK1
ACK1
ACK
9
SD1
SD1
SD
8
LOAD
DTMF RECEIVER 2
IC105
DTMFR1
+5V
14
Vdd
0.022 13
NC
C145
12
EST
11
STD2
STD2
STD
10
ACK2
ACK2
ACK
9
SD2
SD2
SD
8
LOAD
EXT MUSIC
JACK
C402
CN11
L402 1
EXTJACK
J402
C403
1
EXT PAGING
VAG
JACK
C400
CN9 L401 1
PAGJACK J401
C401
1
VAG
(1) (2) (3)(4)(5) (6) (7)
INT4
INT4 19
PAGIN
PAGIN 23
BGM
BGM 18
TONE2
TONE2 17
TONE1
TONE1 16
DTMFG 15
1
2
0.1 100K
C131 R192
3
4
+12V
5
CS(4*8)2
6
7
RESET
1
2
0.1 100K
C133 R193
3
4
5
6
7
DISA2
C130 R159
1
INPUT
0.1 100K
2
NC
3
PD
4
OSCO
5
OSCI
6
NC
7
Vss
C122 R160
1
INPUT
0.1 100K
2
+5V
NC
3
PD
4
OSCO
5
OSCI
6
IC401
NC
BGMIC
7
3.58MHz
2
Vss
3
DTMF RECEIVER 1
(8) (9) (10)(11)(12)(13)(14) ( 15)(16)(17)
3 2 1 27 26 25 24 23
D0 6
DATA
A1 10
AX1
A0 8
AX0
A6 20
AY2
A5 17
AY1
A4 16
AY0
IC502
21
IOWR
STR
(4*8)CROSSPOINT
CROSS POINT
28
VDD
TONE1
X0
12 4+8
7
CS
TONE2
X1
14
9
VSS
BGM
X2
15
11
VEE
X3
22
13
RST
VAG
DTMFG
BGM
VMDTMF2
VMDTMF1
350Hz
620Hz
DTMFR1
D400
5 IC402
C405
C404
1
3 4
0.1
R404 33K
J119
R402
R405
6.8K C406
9 8 6
0.1
2.2K
6 5
+12V
IC402
BGMAMP
VAG
VAG
(18) ( 19) (20) (21)(22)
+12V
+12V
VMDTMF2
Q504
VOICE MAIL
INTEGRATION
D401
OPEN
IC400
7
+12V
L:INTBGM
H:EXTBGM
Q400
KX-TA308 MAIN BOARD NO.3 (2/4)
(23)(24) (25) (26) (28)
+12V
(27)
R901
100K
EXTPAGINGSW
Q502
R902
100K
VMDTMF1
Q503
C905
R903
0.0033
J114
100K
R905
0
220K
C904 R951 C903
6
7
0.1 27K 0.047
5
IC900
TONEAMP
VAG
VAG
LOW PASS FILTER
BGMSW
(h)
(i)
(j)