Panasonic KX-TA308 Service Manual page 7

DC CUT CAPACITOR
C324A
L302A
EXT1
CN30A
0
1
H 1
L 4
L303A
0
R1
R1
T1
T1
RLY30A
6
8
L300A
9
8
10
4
CN30A 0
ZNR30A
RLY20A
T 2
C323A
39V
R 3
NO MOUNT
C321A
11
0
RLY30A
0.022
9
3
13
L301A
4
ZNR31A
RLY20A
5
+24V
39V
P.F.
RELAY
DC POWER
BELL SUPPLY CIRCUIT
CIRCUIT
Q209
POWER FAILURE RELAY SW
C324B
L302B
EXT2
CN30B
0
1
H 1
L 4
L303B
0
RLY30B
8
9
L300B
CN30B 10
0 C323B
T 2 ZNR30B
NO MOUNT
39V
R 3 C321B
RLY30B
0.022
L301B
3
4
0
ZNR31B
5
39V
C324C
L302C
CN30C
EXT3
0
1
H 1
L 4
L303C
0
RLY30C
8
9
L300C
10
CN30C 0
C323C
ZNR30C
NO MOUNT
T 2
39V
R 3
C321C
RLY30C
0.022
L301C
3
4
0
ZNR31C
5
39V
EXT4
C324D
L302D
CN30D
0
1
H 1
L 4
L303D
0
RLY30D
8
L300D
9
10
CN30D 0
C323D
T 2 NO MOUNT ZNR30D
39V
R 3
C321D
RLY30D
0.022
L301D
3
4
0
5
ZNR31D
39V
EXT5
C324E
L302E
CN30E
0
1
H 1
L 4
L303E
0
RLY30E
8
L300E
9
10
0
CN30E
C323E
T 2 ZNR30E
NO MOUNT
39V
R 3 C321E
RLY30E 0.022
L301E
3
4
0
5
ZNR31E
39V
PROTECTOR
Q304A R301A R341A BELL SIGNAL AC80V
47
68
+26V
R302A D302A
10K
2V
C320A T300A
C322A
3
0.022 4 D300A
2.2
1 6
D301A
R310A D303A
VAG
10K 2V
68
R303A
HOOK DETECT
R340A
Q301A 47
CIRCUIT
R304A
Q305A
6.8K
R305A
56K
Q304B R301B R341B
68
47
R302B D302B
10K
2V
C322B
C320B T300B
2.2
D300B
3 4
0.022
1 6
D301B
D303B
R310B
VAG
10K
2V
68
R303B
R340B
Q301B 47
R304B
Q305B
R305B 6.8K
56K
Q304C R301C R341C
47 68
D302C
R302C
10K
2V
C322C
C320C T300C
2.2
0.022 3
4 D300C
1 6
D301C
D303C
R310C
VAG
10K
2V
R303C 68
47 R340C
Q301C
R304C
Q305C
R305C
6.8K
56K
Q304D R301D
R341D
47
68
R302D
D302D
10K
2V
C322D
C320D T300D
2.2
3
0.022 4
D300D
1 6
D301D
D303D
R310D
VAG
10K 2V
68
R303D
47 R340D
Q301D
Q305D
R305D R304D
6.8K
56K
Q304E R301E R341E
47
68
R302E D302E
10K
2V
C322E
C320E T300E
2.2
D300E
0.022 3
4
1 6
D301E
R310E D303E
VAG
10K 2V
68
R303E
Q301E 47 R340E
R305E
R304E
6.8K
56K
VOLTAGE LIMITER
TXD1
RXD
BELL
R317A
R316A
3.9
TXPOWER
2W/100
Q313A
OVER CURRENT DETECT
EXT1
PROTECTOR
5V ON HOOK
+5V
OFF HOOK
0V
HOOK1
+24V
H=BELL ON
L=BELL OFF
BELL1
BELL RELAY SW
Q307A
TXD2
RXD
BELL
R317B
R316B 3.9
TXPOWER
2W/100
Q313B
EXT2
+5V
HOOK2
+24V
BELL2
Q307B
TXD3
RXD
BELL
R317C
R316C
3.9
TXPOWER
2W/100
Q313C
EXT3
+5V
HOOK3
+24V
BELL3
Q307C
TXD4
RXD
BELL
R317D
R316D
3.9
TXPOWER
2W/100
Q313D
EXT4
+5V
HOOK4
+24V
BELL4
Q307D
TXD5
RXD
BELL
R317E
R316E 3.9
TXPOWER
2W/100
Q313E
EXT5
+5V
HOOK5
+24V
BELL5
Q305E
Q307E
+12V PROTECTOR
6V
ANALOGUE SW
0V
IC303
R313A 1 13 1
R313B 1
14 2
R313C 1
15 3
R313D 1
12 4
R313E 1
1 5
R313F 1 5 6
R313G 1
2 7
R313H 1
4 8
KX-TA308 MAIN BOARD NO.1 (1/2)
6V
(1)
3
CON
11 (2)
A
10
(3)
B
9 +12V
C (4)
16
VCC
7
VEE
8
VSS
6
INH
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)