Read Panasonic KX-NT400RU Service Manual online
12
KX-NT400RU
Analog Circuit
HANDS
ET TX
HANDS
ET RX
H
E
ADS
ET TX
HEADS
ET RX
SP
PHONE TX
SP
PHONE RX(G.7
1
1
)
S
P
PH
O
NE RX(G
.722)
47p
+
-
+-
Vref
CC
DET
+
-
+-
AG
C303
K1
C341
K0.082
MUTE_SP2
IC24
1
AO
2
A-
3
A+
4GND
5
B+
6
B-
7
BO
8
VCC
HS_OUT
C340
K0.082
C317
3300p
AG
C338
330p
C335
330p
L305
C355 1200p
C318 K0.22
nG722
AG
AG
C339
Z10
VCC_A33
AG
C352 220u/6.3V
Q304
E
C
B
C316 K0.22
AG
AG
IC22
1
2
36
45
7
8
SP_OUT
AG
C325 330p
Q302
E
C
B
VCC_A33
nG722
C342
K0.082
IC29
5
A
1
COM
6
Y2
7
Y1
CN4
1
2
AG
AG
VCC_A33
C334
270p
VCC_A33
AG
L303
VCC_A33
AG
C322
33p
MUTE_SP0
C304
K1
AG
AG
C330
820p
AG
C324 33p
nG722
VCC_A33
IC20
1
VOUT1
2
VIN1
3
Bypass
4
GND
5
SHUTDOWN
6
VIN2
7
VOUT2
8
VDD
C323 330p
MIC_SW
HS_IN
Q305
E
C
B
AG
C354
1000p C313
1000p
AG
C315 K0.018
AG
MUTE_SP1
C329
330p
AG
IC28
11
S0
14
AN
13
A1
12
A0
AG
AG
AG
AG
C314
NC
IC28
9
S2
4
CN
3
C1
5
C0
L304
IC21
1
SHUTDOWN
2
BYPASS
3
+IN
4
-IN
5
Vo1
6
VDD
7
GND
8
Vo2
C336
K1
C305
820p
nG722
L306
C353
33p
AG
VCC_A33
AG
HS_MIC-
HS_MIC+
HS_SP
HD_AG
HD_SP
HD_MIC
CN7
NC
1
2
CN8
NC
1
2
HS_AG
AG
AC97_OUT
Q307
E
C
B
AG
SIDE_TONE
Q303
E
C
B
R339
470
R329 18k
R333
10k
R335
1k
R344 150k
R340 150
R327 160k
R305
0
R331
10k
R302
47k
R345
10k
R338 2.2k
R311
10k
R326 160k
R306 12k
R334
1k
R310
10k
R313
390k
R342
2.7k
R332
10k
R336
1k
R330
12k
R328
160k
R325
47k
R309
10k
R319 3.3
R303
68k
R324 33k
R343
75k
R323
180k
R322
33k
R304
27k
R337 1.8k
R312 10k
R308
1.8k
R301
10k
L308
L309
L301
IC30
1
2
4
MUTE_CE
C357
100p
C358
100p
C346 1000p
C359
1000p
C349 1000p
C345 1000p
C332 K0.01
C347 K0.01
C320 K0.01
C348 K0.01
C333 K0.01
C311
K0.1
C301
K0.1
C326
K0.1
C344 Z22
C343 Z22
C306
K0.015
C312
K0.015
C307 K0.015
SP3P
SP3M
MUTE_SP2
SP_MUTE1
SIDE_TONE
HEADSET
VCC_A33
AG
C337
K10/10V
C321
K0.1
R315
10k
C319
Z10
IC23
1
AO
2
A-
3
A+
4GND
5
B+
6
B-
7
BO
8
VCC
C328 4700p
AG
MIC_IN
C308
K0.01
C302
K1
nG722
R314
4.7k
VCC_A33
AG
VCC_A33
R307
300k
Q301
E
C
B
AG
R318
10k
R317 10k
C310
AG
R316
20k
L311
0
L310
0
MIC3
C331 1000p
VCC_A33
AG
R320
1k
R321 2.2k
C327 Z22
AG
MIC_SW
MIC1+
SP1
MIC1-
SP2_2
MIC2_2
C361
100p
C362
100p
AG
C363
100p
AG
Q306
E
C
B
R341 100k
R346
100K
C365 100p
AG
C309 100p
C364
33p
AG
C366 100p
C367
K0.01
DG
C368
K0.01
AG
CN5
1
2
C356
K0.015
L302
0
L307
0
L:OFF
H:MUTE
H:Normal
L:G.722
to SP
L:OFF
H:MUTE
L:OFF
H:MUTE
L:Handset
H:Headset
L:IC22_ON H:IC22_OFF
L:NC
H:Headset DET
to MIC
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