KX-TDA6178X, KX-TDA6178XJ (serv.man3) - Panasonic PBX Service Manual Supplement (repair manual). Page 8

Read Panasonic KX-TDA6178X / KX-TDA6178XJ (serv.man3) Service Manual Supplement online

8
KX-TDA6178X / KX-TDA6178XJ
1.3.2.4.
2W-4W Conversion
It converts 4W-VOX signal used in the PBX to 2W-VOX signal used in SLT, and vice versa. It consists of an operational amplifier in
the SLIC and a balanced network (B/N) in the CODEC. It can control the return loss of the audio data and frequency characteristics.
By modifying the CODEC program, it can match the corresponding impedance. 
1.3.2.5.
DTMF Signal Detection
Each port has its own DTMF receiver in the codec. 
Detection of DTMF signal by Codec transmits this data to the MPR via the PLD.
Via the PLD, MPR reads the DTMF signal which is received in the Codec.
1.3.2.6.
Power Supply
Voltage and current generated by the SLIC is supplied to the phones.
Preset voltage is -26V (On-hook).
Current is set as 26mA (Off-hook).
TA
RA
DG
CLK
FH
UHW
DHW
nC_CS0
DIN[0]
DCLK[0]
DOUT[0]
+3.3V
+3.3V
C316A
DG
C300A
C313A
C317A
DG
CN201
2
DIAG_T
RL201A
6
7
5
CN201
3
DIAG_R
RL201A
3
2
4
C313B
DG
C302A
C303A
C302B
C303B
C318A
R300A
R320A
VBATa
J300A
DG
DG
+40V
R310A
J301A
R308A
R309A
R308B
R309B
D305A
C304A
DG
D304A
FG
C305A
C321A
C310A
R315A
R316A
C309A
L300A
DG
DG
R314A
D301A
1
2
C308A
L301A
+40V
DG
Q300A
S
1 2 3
G
4
D
5 6 7 8
J699
Q301A
S
D
G
CN200
26
1
C307A
IC300A
TIPa
1
N/C2 2
SRINGDCa
5
SRINGACa
6
STIPACa
7
STIPDCa
8
SVBATa
11
SVDC 12
FSYNC 15
SDITHRU 16
PCLK 17
DTX 18
DRX 19
SDCHa
20
SDCLa
21
DCDRVa
22
DCFFa
23
DCFFb
24
VDDD 28
VDDREG
29
CSB 30
SCLK 31
SDO 32
SDI 33
STIPDCb
38
STIPACb
39
SRINGACb
40
SRINGDCb
41
VDDA 44
N/C49 49
N/C56 56
RINGa
59
R321A
R319A
R318A
R313A
R306A
R306B
R307A
R307B
RL200A
9
10
8
RL200A
4
3
5
R317A
R260A
R261A
A
To ASIC
To PLD
m
b
m
b
b
m
m
b
SDCL
SDCH
DCDRV
2W-VOX
Audio codec
DSP
PCM I/F
SPI I/F
TA
RA
DG
CLK
FH
UHW
DHW
nC_CS0
DIN[0]
DCLK[0]
DOUT[0]
+3.3V
+3.3V
C316A
DG
C300A
C313A
C317A
DG
CN201
2
DIAG_T
RL201A
NC
6
7
5
CN201
3
DIAG_R
RL201A
3
2
4
C313B
DG
C302A
C303A
C302B
C303B
C318A
R300A
R320A
VBATa
J300A
DG
DG
+40V
R310A
J301A
R308A
R309A
R308B
R309B
D305A
C304A
DG
D304A
FG
C305A
C321A
C310A
R315A
R316A
C309A
L300A
DG
DG
R314A
D301A
1
2
C308A
L301A
+40V
DG
Q300A
S
1 2 3
G
4
D
5 6 7 8
J699
Q301A
S
D
G
CN200
26
1
C307A
IC300A
TIPa
1
N/C2 2
SRINGDCa
5
SRINGACa
6
STIPACa
7
STIPDCa
8
SVBATa
11
SVDC 12
FSYNC 15
SDITHRU 16
PCLK 17
DTX 18
DRX 19
SDCHa
20
SDCLa
21
DCDRVa
22
DCFFa
23
DCFFb
24
VDDD 28
VDDREG
29
CSB 30
SCLK 31
SDO 32
SDI 33
STIPDCb
38
STIPACb
39
SRINGACb
40
SRINGDCb
41
VDDA 44
N/C49 49
N/C56 56
RINGa
59
R321A
R319A
R318A
R313A
R306A
R306B
R307A
R307B
RL200A
9
10
8
RL200A
4
3
5
R317A
R260A
R261A
A
To ASIC
To PLD
m
b
m
b
b
m
m
b
SDCL
SDCH
DCDRV
DTMF signal
Audio codec
DSP
PCM I/F
SPI I/F
TA
RA
C313A
CN201
2
DIAG_T
RL201A
6
7
5
CN201
3
DIAG_R
RL201A
3
2
4
C313B
DG
C302A
C303A
C302B
C303B
VBATa
J300A
DG
DG
R310A
R308A
R309A
R308B
R309B
D305A
C304A
DG
D304A
FG
C305A
C321A
C310A
R315A
R316A
C309A
L300A
DG
DG
R314A
D301A
1
2
C308A
L301A
+40V
DG
Q300A
S
1 2 3
G
4
D
5 6 7 8
Q301A
S
D
G
CN200
26
1
C307A
IC300A
TIPa
1
SRINGDCa
5
SRINGACa
6
STIPACa
7
STIPDCa
8
SVBATa
11
SDCHa
20
SDCLa
21
DCDRVa
22
DCFFa
23
DCFFb
24
STIPDCb
38
STIPACb
39
SRINGACb
40
SRINGDCb
41
RINGa
59
R319A
R318A
R313A
R306A
R306B
R307A
R307B
RL200A
9
10
8
RL200A
4
3
5
R317A
R260A
R261A
m
b
m
b
b
m
m
b
SDCL
SDCH
DCDRV
TIP
RING
0
-26V
Page of 43
Display

Click on the first or last page to see other KX-TDA6178X / KX-TDA6178XJ (serv.man3) service manuals if exist.