Panasonic KX-TG3521BXB Service Manual page 83

4.0V
(1)
3.3V
IC331
(2)
VOUT VIN
5 4
NC2 VDET
6 3
GND *RESET
7 2
CD NC1
8 1
(3)
ANALOG_GND
(4)
RF_GND
(5)
(6)
(7)
RX
120mVp-p
R172 100k
C172
K2700P(50V)
(8)
E
B
C
Q171
C174 C167 R167
NC K0.22 1k
(9)
(10)
(11)
(12)
R183 2.2k C185 R185 33k
(13)
K0.018
(14)
(15)
(16)
KX-TG3521BXB/KX-TG3521BXS/KX-TG3522BXB/KX-TG3522BXS/KX-TGA351BXB/KX-TGA351BXS
4.0V CONVERTOR
Q300
L300 22uH
IC300
1 5
ON/*OFF
VIN
2
VSS
3 4
VOUT
EXT
DCDC_IC
DIGITAL_GND
TX
800mVp-p
C
B
E
Q161
*Q156
NC
C
R164 C163 B
*R162
E
47 K4700P(50V) 39k
TX
80mVp-p
KX-TG3521/3522 SCHEMATIC DIAGRAM (Base Unit_Main)
83
CHARGE PAD
CHARGE2+
CHARGE+
CHARGE-
L371
NC
CHARGE2-
R342 NC
3
1
2
Q340
NC
*Q143
Power failure detection
NC
*Q141
C141 NC
R141 100k
C101
680p(3216)
L101
C
B 3 2
33u
E
Q142
4 1
D101
L102
C102 680p(3216)
R115 NC
C115
NC
R121 390k C121 K680P(50V)
R122 390k
C122 K680P(50V)
CID
Q111
E
B
C
Bell detection
NC: No Components
REFERENCE
1XX : TEL LINE
3XX : POWER, CHARGE
4XX : RESET, MIC, SP
5XX : DSP, RF I/F
6XX : FLASH, KEY, LCD
7XX : RF(2.4G)
8XX : RF(5.8G)
11~13V
DCPDCP2
1
2
CN301
DCM DCM2
L1T
RX
CN101
1
2
TEL JACK
33u
*P101 22
L1R
TX
Test Signal
Frequency: 1kHz
Rx
(MIC Mute: ON)
-25dBm/600 IN
100mVp-p
Tx
-10dBm/600
700mVp-p