DOWNLOAD Panasonic KX-NT366RU (serv.man2) Service Manual ↓ Size: 3.56 MB | Pages: 82 in PDF or view online for FREE

Model
KX-NT366RU (serv.man2)
Pages
82
Size
3.56 MB
Type
PDF
Document
Service Manual
Brand
Device
PBX / IP PROPRIETARY TELEPHONE
File
kx-nt366ru-sm2.pdf
Date

Panasonic KX-NT366RU (serv.man2) Service Manual ▷ View online

9
KX-NT366RU/KX-NT366RU-B
4.2.6.
Analog Circuit
This circuit performs the setting of the call path/vol. adjustment in each call mode by a built-in DSP of VoIP(IC1).The audio gain
of each call is determined by download data from PBX or by internal data from flash memory(IC2).
In case of the extension call between NT300, The telephone call becomes a characteristic in accordance with G722.
1. Handset Call
Transmitting signal is inputted from handset microphone, and amplified by IC24 and IC25 
 Inputted to IC1-pin112 
→ A/D conversion and Gain adjustment by a built-in DSP of IC1 → then sent to PBX.
Transmitting signal inputted from handset microphone is controlled by transmission switching SW IC27 as follows; 
IC27-pin11 L: Handset Call
(IC27-pin11 H: Headset Call)
Transmitting signal inputted from PBX 
→Gain adjustment by a built-in DSP.
Receiving signal inputted from PBX 
→ Gain adjustment by a built-in DSP of IC1 → D/A conversionand outputted from IC1-
pin115. 
→ Amplified by IC20, and outputted to handset.
2. Headset Call
Transmitting signal is inputted from headset microphone, and amplified by IC24 and IC25 
→ Inputted to IC1-pin112 → A/D
conversion and Gain adjustment by a built-in DSP of IC1 
→ then sent to PBX.
Transmitting signal inputted from headset microphone is controlled by transmission switching SW IC27 as follows;
 IC27-pin11 H: Headset Call
 (IC27-pin11 L: Handset Call)
Receiving signal inputted from PBX 
→ Gain adjustment by a built-in DSP of IC1 → D/A conversion and outputted from IC1-
pin115.
→ Amplified by IC20, and outputted to headset.
3. Speakerphone Call
Speakerphone call realize all double-call by a built-in DSP(echo-canceller)of IC1. For a call In the most appropriate condition,
DSP checks voice level of the calling party, acoustics in a room, voice level of the other party and state of the line of contact,
and cancels echo in transmitting and receiving at the start of calling. It operates in a half double-call state in a few seconds for
the check.
Transmitting signal is inputted from microphone and amplified by IC23
→inputted to IC1-pin113 → A/D conversion and Gain
adjustment by a built-in DSP of IC1, then sent to PBX through echo canceller.
Receiving signal inputted from PBX 
→ Gain adjustment by DSP through a built-in echo canceller of IC1 → D/A conversion
and outputted from IC1-pin116 
→ Amplified by IC21 and outputted to Speaker.
 Power Amp IC21 is controlled as follows;
 IC21-pin1 L: ON
 IC21-pin1 H: OFF
10
KX-NT366RU/KX-NT366RU-B
+
-
+-
+
-
+-
+
-
+-
Vref
CC
DET
A3.3V
IC20
1
VOUT1
2
VIN1
3
Bypass
4
GND
5
SHUTDOWN
6
VIN2
7
VOUT2
8
VDD
R339
AG
AG
AG
A3.3V
R320
A3.3V
A3.3V
C327
AG
AG
C343
R327
A3.3V
AG
IC24
1
AO
2
A-
3
A+
4
GND
5
B+
6
B-
7
BO
8
VCC
D3.3V
C324
C333
R314
AG
IC23
1
AO
2
A-
3
A+
4
GND
5
B+
6
B-
7
BO
8
VCC
R310
R319
AG
AG
MUTE_SP0
AG
AG
IC21
1
SHUTDOWN
2
BYPASS
3
+IN
4
-IN
5
Vo1
6
VDD
7
GND
8
Vo2
AG
Q1
E
C
B
R311
R318
AG
IC25
1
AO
2
A-
3
A+
4
GND
5
B+
6
B-
7
BO
8
VCC
C331
R348
AG
AG
MUTE_SP2
R345
AG
AG
AG
A3.3V
R326
MUTE_SP1
R317
C344
R346
C314
A3.3V
AG
R337
A3.3V
R338
C346
MIC_SW
C350
A3.3V
AG
R341
R340
R343
AG
A3.3V
R344
C351
R342
AG
R300
AG
R303
AG
AG
C303
A3.3V
C300
A3.3V
R347
AG
HEADSET
L302
AG
L304
L303
SP1
AG
AG
L301
AG
D8
AG
L305
AG
SP2_2
L306
AG
MIC2_2
AG
L307
C302
C301
R325
Q2
E
C
B
Q3
E
C
B
C339
C355
C325
C356
C309
C340
C311
NC
C305
C358
C353
C338
C354
R350
R349
HD_AG
HS_SP
HD_DET
HD_MIC
HS_MIC-
HD_SP
HS_AG
HS_MIC+
IC29
5
A
1
COM
6
Y2
7
Y1
IC30
5
A
1
COM
6
Y2
7
Y1
IC22
1
2
3
4
5
6
7
8
AG
R301
MIC1+
MIC1-
R322
R323
IC26
9
S2
4
CN
3
C1
5
C0
IC26
11
S0
14
AN
13
A1
12
A0
IC26
10
S1
15
BN
1
B1
2
B0
IC27
9
S2
4
CN
3
C1
5
C0
IC28
9
S2
4
CN
3
C1
5
C0
IC27
11
S0
14
AN
13
A1
12
A0
IC28
11
S0
14
AN
13
A1
12
A0
CN4
1
2
CN5
1
2
R306
R315
R321
R331
C336
C337
R324
R329
C334
C319
C316
C318
NC
C312
C315
C306
C307
C329
C328
R351
L308
L309
MIC3
C367
SP3P
SP3M
C362
C332
C313
R316
L310
C363
C364
C365
C366
R302
R304
R308
R305
R313
R333
R334
R332
R335
R336
C330
C326
R312
R309
C335
C310
C308
R352
R307
C348
C349
C347
C345
C342
C341
C304
C320
C321
R330
R328
C322
C323
to SP
to MIC
to CN1
Handset
to CN1
Headset
L:IC22_ON
H:IC22_OFF
L:Normal
H:G.722
L:OFF H:MUTE
L:OFF
H:MUTE
L:OFF
H:MUTE
L:NC
H:Headset DET
L:Handset
H:Headset
ANALOG CIRCUIT 
G.722
122
120
116
148
105
106
112
121
123
115
MIC_IN
HEADSET
MIC_SW
SP_OUT
MUTE_SP2
MUTE_SP1
MUTE_SP0
HS_IN
HS_OUT
SIDE_TONE
IC1
G.722
HANDSET TX 
HANDSET RX 
HEADSET TX 
HEADSET RX 
SP PHONE TX 
SP PHONE RX 
HANDSET TX 
HANDSET RX 
HEADSET TX 
HEADSET RX 
SP PHONE TX 
SP PHONE RX 
G.711
11
KX-NT366RU/KX-NT366RU-B
4.2.7.
Sub-CPU (IC4, IC5)
IC4 controls KEY, LED, and LCD. IC5 controls Self-labeling.
A reset signal from the VoIP(IC1) starts either reset or normal operating.(L:RESET)
The SUB-CPU and VoIP are connected by a serial communication.
IC4 checks the presence of IC5 by getting the signal from IC5.
12
KX-NT366RU/KX-NT366RU-B
4.2.8.
Key Input Control Circuit
The key data is under the matrix control by IC4.
The key information outputted from KEYOUT is inputted into KEYIN, when the key is pressed.
The HOOK key is independent from Key Scan Matrix and taken into the port singularly.
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