Panasonic KX-TDA6381X / KX-TDA6381SX Service Manual ▷ View online
10
KX-TDA6381X/KX-TDA6381SX
4.2.1.4.
8-Port Sub Board
8-Port Sub Board is mounterd to Main Board.
DT_OE[15]
DT_OE[11]
DT_OE[13]
DT_OE[12]
DT_OE[14]
DT_OE[8]
DT_OE[9]
DT_OE[8-15]
D[0-7]
DT_OE[10]
DT_OE[13]
DT_OE[15]
LA[0-5]
DT_OE[9]
R[14]
R[15]
R[8]
R[10]
R[9]
R[11]
R[13]
R[12]
T[8]
DT_OE[8]
LA[1]
LA[2]
LA[5]
D[0]
D[1]
D[2]
D[3]
D[4]
D[5]
D[6]
D[7]
LA[4]
LA[0]
LA[3]
DT_OE[12]
T[9]
T[10]
T[11]
T[12]
T[13]
T[14]
T[15]
DT_OE[11]
DT_OE[14]
DT_OE[10]
OPT[1]
DG
DG
CLK
FH
DHW
UHW
C_CS[2]
C_CS[3]
DCLK
DIN
DOUT
DG
+5V
nRD
CLK
nWR
nCS_CID[1]
nRST
11
19
31
17
18
49
57
22
56
28
52
21
51
48
55
2
1
47
3
29
30
59
34
33
53
23
4
45
60
17
25
27
15
13
19
26
54
6
5
7
38
3
9
32
12
8
8
13
CN8
5
24
20
46
50
16
43
40
58
39
7
10
15
41
11
42
14
36
35
6
37
9
12
44
CN2
12
34
CN2
9
CN2
10
35
37
CN2
11
36
CN2
13
38
CN2
14
39
CN2
15
40
CN2
16
41
5
6
7
8
5
6
7
8
CN6
1
2
14
16
18
4
10
20
J1I
J1J
J1K
J1L
J1M
J1N
J1O
J1P
SFG
+3.3V
+2.5V
DG
TH1I
TH1J
TH1K
TH1L
TH1M
TH1N
TH1O
TH1P
+15V
DG
C
928
C
929
C
930
C
931
SFG
C9
1
C9
0
RA
6
R
A
5
11
KX-TDA6381X/KX-TDA6381SX
4.2.2.
Description of Functions and Circuits
4.2.2.1.
Dial Pulse Signal Transmission
Transmits 10pps/20pps dial pulse by a open/close action between Tip and Ring with Photo MOS relay.
The make width, break width and inter digital width for 10pps/20pps can be set respectively.
When making, 37pin (DIAL [0]) of IC6 becomes Low level, and RL3 turns ON. When breaking, 37pin (DIAL [0]) of IC6 becomes
High level, and RL3 turns OFF.
The make width, break width and inter digital width for 10pps/20pps can be set respectively.
When making, 37pin (DIAL [0]) of IC6 becomes Low level, and RL3 turns ON. When breaking, 37pin (DIAL [0]) of IC6 becomes
High level, and RL3 turns OFF.
It provides the SHUNT control function for the stabilization of line power depending on the destination. Turning ON PC5 when
transmitting pulse reduces the impedance at making, and stabilizes the line power.
transmitting pulse reduces the impedance at making, and stabilizes the line power.
4.2.2.2.
Circuit For Line Acquisition
Making CODEC (e.g. pin-37 of IC6, DIAL [0]) Low level, the photo MOS relay (RL3) turns ON and the line is acquired.
It is used in common as Dial Pulse transmitting circuit.
It is used in common as Dial Pulse transmitting circuit.
DC Loop Path:
• Ring
• Ring
L1D1D2J7D3RL3Q4(C-E)D4D3L1TH1Tip
• Tip
TH1L1D3D4Q4(C-E)RL3D3J7D2D1L1Ring
R[0]
T[0]
AG
+5V
DG
DG
DG
DG
DG
+5V
+5V
+5V
+5V
+5V
SFG
R
20A
PC5A
1
2
3
4
R
17A
D2A
R3
A
T1A
2
1
3
4
C1
A
C2
A
C4
A
C8A
D1A
D4
A
R21A
R
11A
R
14A
R15A
R16A
R1
8
A
R
19A
R1
A
R22A
R2
A
R4A
1.2K
R5
A
R6
A
J1A
RL
2
A
4
3
2
1
J4A
PC1A
1
23
4
PC2A
1
2
3
4
PC
4
A
1
2
3
4
L1A
1
2
3
4
C3
A
CN3 2
CN3 3
J7
A
C6
A
C7A
Q5A
E
C
B
ZN
R
2
A
CN2
1
26
D3A
1
2
3
4
TH1A
ZN
R
1
A
RL3A
4
3
2
1
D5
A
SA
1
A
12
3
Q4A
E
C
B
A
Ring
Tip
CODEC
IC6
R[0]
T[0]
AG
+5V
DG
DG
DG
DG
DG
+5V
+5V
+5V
+5V
+5V
SFG
R
20A
PC5A
1
2
3
4
R
17A
D2A
R3
A
T1A
2
1
3
4
C1
A
C2
A
C4
A
C8A
D1A
D4
A
R21A
R
11A
R
14A
R15A
R16A
R
18A
R
19A
R1
A
R22A
R2
A
R4A
R5
A
R6
A
J1A
RL
2
A
4
3
2
1
J4A
PC1A
1
23
4
PC2A
1
2
3
4
PC
4
A
1
2
3
4
L1A
1
2
3
4
C3
A
CN3 2
CN3 3
J7
A
C6
A
C7A
Q5A
E
C
B
ZN
R
2
A
CN2
1
26
D3A
1
2
3
4
TH1A
ZN
R
1
A
RL3A
4
3
2
1
D5
A
SA
1
A
12
3
Q4A
E
C
B
A
Ring
Tip
CODEC
IC6
12
KX-TDA6381X/KX-TDA6381SX
4.2.2.3.
DTMF Signal Transmission
This transmits the DTMF signal on the highway timeslot. The different DTMF signals can be transmitted to the optional ports at
the same time.
They are transmitted to the line through CODEC.
the same time.
They are transmitted to the line through CODEC.
4.2.2.4.
Bell Signal Detection
During on-hook, transmitting the bell signal to the AC loop in the CR series circuits (C3 and R5) detects the current by Photo
Coupler (PC1,2), and it determines the presence of a bell signal. Software performs the operation for recognition and determina-
tion of a pattern of bell signals.
Coupler (PC1,2), and it determines the presence of a bell signal. Software performs the operation for recognition and determina-
tion of a pattern of bell signals.
Bell loop path
• Ring
L1R2PC2(1-2)C3R5L1TH1Tip
In this path, PC1 4-pin converts from High to Low, and a bell signal is detected.
• Tip
TH1L1R5C3PC2(1-2)R2L1Ring
In this path, PC2 4-pin converts from High to Low, and a bell signal is detected.
VIN[0]
DIAL[0]
VOUT[0]
CPCDET[0]
SHNT[0]
VH1
+15V
DG
+5V
AG
+5V
AG
R
20A
PC5A
1
2
4
R32A
T1A
2
1
3
4
C10A
C11A
C12A
C16A
C8A
C9A
IC1A
1
2
3
4
8
R21A
R22A
R24A
R27A
R
30A
R
34A
R35A
DA1A
1
2
3
C7A
IC1A
5
6
7
R23A
DTMF signal
CODEC
R[0]
T[0]
AG
+5V
DG
DG
DG
DG
DG
+5V
+5V
+5V
+5V
+5V
SFG
R
20A
PC5A
1
2
3
4
R
17A
D2A
R3
A
T1A
2
1
3
4
C1
A
C2
A
C4
A
C8A
D1A
D4
A
R21A
R
11A
R
14A
R15A
R16A
R
18A
R
19A
R1
A
R22A
R2
A
22
R4A
1.2K
R5
A
R6
A
J1A
RL
2
A
4
3
2
1
J4A
PC1A
1
23
4
PC2A
1
2
3
4
PC
4
A
1
2
3
4
L1A
1
2
3
4
C3
A
CN3 2
CN3 3
J7
A
C6
A
C7A
Q5A
E
C
B
ZN
R
2
A
CN2
1
26
D3A
1
2
3
4
TH1A
ZN
R
1
A
RL3A
4
3
2
1
D5
A
SA
1
A
12
3
Q4A
E
C
B
A
Ring
Tip
13
KX-TDA6381X/KX-TDA6381SX
4.2.2.5.
End-Call Signal Detection
This is detected by the photo coupler (pin 4 of PC4) at part of making DC loop. PC4 4-pin is High level during a call. However, at
end-call, PC4 4-pin converts from High to Low.
It detects an end-call with measuring of the signal width of Low level by CODEC (e.g. pin 35 of IC6, CPCDET).
The available setting values for detection width are none, 0.5msec~8msec(at 2msec intervals) and 16~896msec(at 8msec inter-
vals).
end-call, PC4 4-pin converts from High to Low.
It detects an end-call with measuring of the signal width of Low level by CODEC (e.g. pin 35 of IC6, CPCDET).
The available setting values for detection width are none, 0.5msec~8msec(at 2msec intervals) and 16~896msec(at 8msec inter-
vals).
4.2.2.6.
Polarity Reversal Detection
Configured by the photo couplers (PC1, PC2) that enable to detect each current in Tip
Ring, RingTip direction. (PC2 is used
in common as the bell detection photo coupler). Using Software, it stores the current direction (the detected photo coupler) at
acquiring line and recognizes the action by changing of the current direction (the detected photo coupler changes).
acquiring line and recognizes the action by changing of the current direction (the detected photo coupler changes).
When the current flows in the direction of Ring to Tip, 4-pin of PC1 is Low and 4-pin of PC2 is High.
• Ring
L1R2PC1(1-2)D3RL3Q4(C-E)D4D3L1TH1Tip
When the current direction (polarity) is reversed from Tip to Ring, 4-pin of PC1 turns to High and 4-pin of PC2 turns to Low.
It recognizes the action by changing of the current direction (the detected photo coupler changes).
It recognizes the action by changing of the current direction (the detected photo coupler changes).
• Tip
TH1L1D3D4Q4 (C-E)RL3D3PC1 (1-2)R2L1Ring
AG
+5V
DG
+5V
+5V
R
20A
PC5A
1
2
3
4
R
17A
T1A
2
1
3
4
C8A
D4
A
R
11A
R
14A
R15A
R16A
R
18A
R
19A
PC
4
A
1
2
3
4
C6
A
C7A
Q5A
E
C
B
ZN
R
2
A
RL3A
4
3
2
1
D5
A
Q4A
E
C
B
CODEC
IC6
R[0]
T[0]
AG
+5V
DG
DG
DG
DG
DG
+5V
+5V
+5V
+5V
+5V
SFG
R
20A
PC5A
1
2
3
4
R
17A
D2A
R3
A
T1A
2
1
3
4
C1
A
C2
A
C4
A
C8A
D1A
D4
A
R21A
R
11A
R
14A
R15A
R16A
R1
8
A
R
19A
R1
A
R22A
R2
A
R4A
1.2K
R5
A
R6
A
J1A
RL
2
A
4
3
2
1
J4A
PC1A
1
23
4
PC2A
1
2
3
4
PC
4
A
1
2
3
4
L1A
1
2
3
4
C3
A
CN3 2
CN3 3
J7
A
C6
A
C7A
Q5A
E
C
B
ZN
R
2
A
CN2
1
26
D3A
1
2
3
4
TH1A
ZN
R
1
A
RL3A
4
3
2
1
D5
A
SA
1
A
12
3
Q4A
E
C
B
A
Ring
Tip
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