87
KX-TG8421FXB/KX-TG8421FXN/KX-TGA840FXB/KX-TGA840FXN
+1.8V
CN4
Headset Jack
1
4
2
3
5
100k
R32
MIC-
MIC+
RECEIVER
+
-
SP-PHONE_SPEAKER
+
-
R100
( )
D10p
C71
D10p
C83
D10p
C72
D10p
C73
D10p
C113
C128
( )
C108
( )
C82
K470p
K0.1u
C172
L72
10k
R40
10k
R41
GND
BATTERY
R152
( )
GND
GND
0
R208
0
R209
C111
( )
C109
( )
10k
R42
D3
( )
2
1
D4
( )
2
1
C77
( )
C76
( )
VREFm
VREFm1
VREFm
VREFm
GNDGND
GND
GND
GND
GND
VREFm
GND
RE2
64K
1
A0
2
A1
3
A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
CP+2.5V
C10
K2.2u
L73
( )
0
R33
100k
R34
100
R306
VREFm1
C86
K10u
D21
D22
10
L74
K1000p
C127
R307
( )
GND
VREFm1
VREFm
VREFm
VREFm
GND
GND
R309
( )
R310
( )
L9
VREFm1
VREFm1
VREFm VREFm
K0.1u
C33
K1000p
C152
GND
GND
ANT_TP
GND
K1u
C188
GNDGND
GND
GND
GND
L3
( )
R308
L71
( )
K1000p
C110
K1000p
C185
GND
100n
C808
220
R806
1
PSET
2
VCCS
3
PI
4
PIX
7
PSEL
8
POX
9
PO
10
VCC
11
GND
5
PRAMP
6
PAON
1k
R803
GND
RXON
GND
10p
C819
PON
GND
10p
C809
GND
PSEL
RF_RXp
220
R807
1k
R804
VDD_PADRV
TXON
GND
10p
C812
10p
C827
TXp
GND
GND
GND
GND
47
R805
TXn
GND
GND
10p
C825
RF_RXn
GND
3.3n
C814
GND
GND
GND
10p
C81
1
GND
BATTERY
D13
D14
GNDGND
D10p
C70
1.8V
2p
C804
2p
C802
1.5p
C803
27n
L801
C837
NC
GND
DA801
1
2
3
SHIELD
1
2
3
4
5
6
3p
C861
L804
NC
GND
GND
2p
C826
0.7p
C820
10p
C822
CARBON_CL1
MIC AP1
1
2
10p
C860
3.6n
L802
3.6n
L803
1.6p
C810
1.6p
C813
3.3p
C805
3.3p
C806
0.5p
C862
C859
4p
D10p
C864
D10p
C863
GND
GND
R808
( )
GND
100
R802
0.5p
C834
R74
82
R73
82
D10p
C74
D10p
C75
VREFm
VREFm
680
R801
VREFm
MICh
LSRp
LSRp
LSRn
MICp
MICn
HEADSET_DET
(MAX500mA)
Balun
BPF
Pre-matching
W 0.15mm
L 5.0mm
1st layer
W 0.15mm
L 5.0mm
1st layer
W 0.125mm
L 7.6mm
Gap 0.125mm
1st layer
W 0.15mm
L 20+/-2mm
3rd layer
W 0.15mm
L 20+/-2mm
3rd layer
W 0.15mm
L 20+/-1mm
3rd layer
W 0.15mm
L 4.0mm x2
1st layer
Test Pattarn for Carbon
Shield Case
IC3
IC801
(1)
(2)
(3)
(4)
(5)
(7)
(6)
(9)
(10)
(11)
(12)
(13)
(14)
(8)
KX-TGA840 SCHEMATIC DIAGRAM (Handset_Main)
NC: No Components
1.8V
RX_RF
TX_RF
TX _AF
RX-AF (Handset)
Sp-phone RX/Beep
Summary of Contents for KX-TG8421FXB
Page 2: ...2 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN ...
Page 14: ...14 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 4 6 Signal Route ...
Page 15: ...15 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN ...
Page 24: ...24 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 7 6 Troubleshooting ...
Page 25: ...25 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN Cross Rreference For Service Hint P 28 ...
Page 26: ...26 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN ...
Page 27: ...27 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN ...
Page 31: ...31 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 8 1 2 Handset ...
Page 57: ...57 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN ...
Page 58: ...58 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 10 1 2 Handset ...
Page 59: ...59 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 10 1 3 Charger Unit ...
Page 60: ...60 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 10 2 How to Replace the Handset LCD ...
Page 85: ...85 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN Memo ...
Page 99: ...99 KX TG8421FXB KX TG8421FXN KX TGA840FXB KX TGA840FXN 15 4 2 KX TGA840FXB FXN ...