Schematic Diagram (Cordless Handset) - Panasonic KX-TG2873BXS Service Manual

KX-TG2873BXS/KX-TGA280BXS

13.6. Schematic Diagram (Cordless Handset)

TX (cordless handset)
RX (cordless handset)
CHG+
CHARGE+
1
J3
For Charge
terminal
CHARGE-
1
J4
CHG-
DG
+2.5V
R72
1K
R70
1K
R71
DG
DG DG
100
R85
COL0
1K
R86
COL1
1K
R87
COL2
1K
R88
COL3
1K
R89
COL4
1K
KEY Back-Light
Q100
DG
NC: No Components
BATTERY+
For Battery terminal
BATTERY-
DG
R500
1K
Q500
DG
UTX
URX
ROW1
JTAG
WP
LCD_RS
LCD_SI
LCD_SCL
LCD_RESET
ROW2
DG
RSSI
X1
10.368MHz
RFG
VBAT
VDDPA
LCD Back-Light
Q101
DG
Land for soldering VBAT
VBAT
L502
1
J1
L503
1
J2
DG
Q502
D501
Q501
DG DG
DG
R505 5.6K
R506 5.6K
+1.8V +2.5V
1 INT1n/P1[1]
C1 K0.01u
2 VDDIO2
C2 K0.01u
3 VDD3
4 VSS4
5 LED1/PWM0/P2[0]
6 LED2/PWM1/P2[1]
7 LED3
8 LED_BIAS/P3[6]/PD6
9 SDA1/P2[5]
10 SCL1/P2[4]
11 INTn5/VDDE/P1[5]
12 INT2n/P1[2]
13 AVD
14 AVS
15 CAP
16 Xtal1
17 VSSRF
18 RFCLKp
19 PSSI/RFCLKm
R60
20 VDDRF
R2
100
1M
C61
J12p
C60 J18p
C201
C202
DG
( ) ( )
NC
DG
74
L300 D300
22u
DG DG
Q300
DG
C400 C403
( )
( )
NC NC
AG
R6 NC
60
59
58
LDO2_CTRL
57
LDO1_CTRL
56
VBAT1
55
DC_I
DC_Sense
54
DC_stab
DC_CTRL
53
RSTn
52
P1[7]/CHARGE/INT7
51
IC1 P2[3]/ADC1
50
VDD50
49
VSS49
48
P0[7]/SPIDI/PCM_DIN
47
P0[6]/SPIDO/PCM_DOUT
46
P0[5]/SPICLK/PCM_CLK
45
P0[4]/SCL2
44
P0[3]/SDA2
43
P0[2]/JTIO
42
P0[1]/URX
41
P0[0]/UTX
PCM-FO
DG
+2.5V
R202
C207 C208
( )
NC
K1u K1u
C206
C205
NC
K1u K1u
For LCD
(1)
R301
56
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
+1.8V
(11)
(12)
(13)
DG
C15
(14)
K0.01u
(15)
(16)
C12 K1000p
C13 K0.22u (17)
PCM-CK PCM-DO
COL3
COL1
COL2
(18)
(19)
JTAG
URX
UTX
VBAT
WP
(20)
D1
DG
(21)
(22)