Panasonic KX-TG8421FXB Service Manual page 87

1.8V
(MAX500mA)
+1.8V
1.8V
(1)
C10
K2.2u
GND
CP+2.5V
C172
K0.1u
8 1
VCC A0
7 2
(2)
WP A1
R42 10k
6 64K 3
(3)
SCL A2
R41 10k
5 4
(4)
SDA GND
R40 10k
RE2
IC3
BATTERY
R152
(5)
(6)
(7)
C188
K1u
GND
R33 R34
(8)
0 100k
R32
C111
100k
C33
C109
K0.1u
VREFm VREFm
GND
(9)
VREFm
(10)
LSRp
(11)
(12)
VREFm
(13)
(14)
6
ANT_TP
C859 C803
4p
GND
GND GND
GND GND
W 0.15mm
L 5.0mm
1st layer
W 0.15mm
L 20+/-1mm
3rd layer
GND
GND
C812
10p
W 0.15mm
L 20+/-2mm
3rd layer
R806
220
GND
Sp-phone RX/Beep
MICh
HEADSET_DET
L9
LSRp
( )
L3
RX-AF (Handset)
LSRn
MICp
MICn
SHIELD
5 4
Test Pattarn for Carbon
CARBON_CL1
3
GND
1 2
KX-TG8421FXB/KX-TG8421FXN/KX-TGA840FXB/KX-TGA840FXN
L801 C827
27n
10p
2
3
1
1.5p
DA801
GND
GND GND
BPF
W 0.15mm
L 5.0mm
1st layer
BATTERY
GND GND 11
GND
10
VCC
9
PO GND
8
POX
7
PSEL
6
PAON PRAMP
GND GND
IC801
Balun
R803
PSEL
1k
GND
R804
Pre-matching
PON
GND
1k
C864
TXON
D10p
GND
C83
D10p
R100
C86
( )
K10u
C127
K1000p
GND
VREFm
GND GND
TX _AF
R73
82
R74
82
C77
KX-TGA840 SCHEMATIC DIAGRAM (Handset_Main)
87
W 0.15mm
L 20+/-2mm
3rd layer
R807
RXON
220
GND
C826
RX_RF
2p
RF_RXn
RF_RXp
W 0.125mm
GND
L 7.6mm
Gap 0.125mm
1st layer
Shield Case
W 0.15mm
L 4.0mm x2
GND
1st layer
GND
1
TXn
PSET
2
VCCS
3
PI
4
PIX
5
TXp
TX_RF
R805 47 VDD_PADRV
GND
GND
D14
R208
+
0 C72
SP-PHONE_SPEAKER
R209 D10p
-
0
C73
D13
D10p
GNDGND GNDGND
L71
L72
R306
1
( )
100
2 CN4
3
( )
4 Headset Jack
L73
5
10
L74
C110
C82 C185
R307 R308
K1000p
K470p
K1000p
( )
GND
VREFm1 VREFm1 VREFm1
VREFm1 GND VREFm
C152
C70
K1000p
D21
D10p
+
C71
RECEIVER
D10p D22
-
GND GND
GND GND
MIC+
C113
D10p
C76
1
C75
MIC AP1
D10p
2
MIC-
C74
R309 R310
D10p
( ) (
VREFm GNDGND VREFm
VREFm VREFm
VREFm GND VREFm
NC: No Components
VREFm1
)
GND