Read Panasonic KX-DT521RU Service Manual online
10
KX-DT521RU/KX-DT521RU-B
4.2.5.
Analog Circuit
1. Speaker phone call
Transmitting signal is input from microphone
input to IC410-pin 33 and 34 amplified by a built-in analog amplifier of
IC410
A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.
Receiving signal is sent by data from PBX
Gain adjustment and D/A conversion by a built-in DSP of IC410 amplified by
a built-in analog amplifier of IC410
output from IC410-pin 38 and 40 output to Speaker.
2. Handset call
Transmitting signal is input from handset microphone
input to IC410-pin 35 and 36 amplified by a built-in analog ampli-
fier of IC410
A/D conversion, Gain adjustment and echo cancel by a built-in DSP of IC410.
Receiving signal is sent by data from PBX
Gain adjustment and D/A conversion by a built-in DSP of IC410 amplified by
a built-in analog amplifier of IC410
output from IC410-pin 41 output to handset speaker.
MIP
SPP
SPN
SPAMPEN
IC410
DCX81
DG
AGND
AGND
AGND
SPP
AGND
SP2
MIP
AGND
MIC1
DG
AGND
SP1
MICBIAS
SPN
MIC2
MIN
AGND
AGND
C500
C501
C504
C503
C507
C502
C506
C530
C531
C532
C534
C535
C537
C538
R534
R532
R533
C536
DG
DG
DG
DG
G
D
G
D
D500
D501
D530
D531
R501
R502
R565
C569
C540
C541
R530
R531
38
SPOUTP
40
SPOUTN
34
MIP
33
MIN
R535
HSMICINP
IC410
DCX81
AGND
AGND
AGND
AGND
AGND
AGND
MICBIAS
AGND
AGND
AGND
AGND
C515
C516
C517
R517
R518
R519
R520
C521
C522
C523
C524
C526
C527
C528
DG
DG
DG
DG
D515
D516
D517
HSMIP
HSMIN
HSSPOUT
R568
JK501
1
2
3
4
2
3
4
5
L463
L464
L465
R564
C570
C518
C513
C514
R515
R516
C525
C519
C520
R574
DG
Handset Jack
36
HSMIP
35
HSMIN
41
HSSPOUTP
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