Panasonic KX-TG2873BXS

69
KX-TG2873BXS/KX-TGA280BXS
2/4
KX-TG2873BX SCHEMATIC DIAGRAM (Base Unit_Main_2/4)
(2)
(1) (3)
(4) (5) (6)
(t)
(u)
(v)
(w)
(x) (y)
Q401
RF3.45V
+5V
+VIN
+5V
+5V
+5V
+5V
+5V
+5.5VF
( )
Q406
Q405
DG
DG
DG
DG
DG
DG
DG
DG
DG
DG
DG DG
DG
DG
DG
LREF
TP406
TP404
TP403
TP405
IC301
1
CONT
2
GND
3
NP
4
VOUT
5
VIN
( )
10k
R419
( )
NC
R421
( )
NC R420
( )
NC
R416
( )
NC
R418
220k
R207
DA400
NC
1 23
( )
Q403
( )
Q402
NC
NC
NC
NC
NC
NC
NC
( )
Q400
( )
NC
C406
TP303
TP305
TP304
( )
NC
C400
Z0.1u
C311
Z0.1u
C307
( )
NC
C402
Z0.1u
C310
( )
NC
R403
( )
NC
R407
( )
NC
R400
100
R321
( )
NC
R322
10V560u C319
( )
NC
C317
Z0.1u
C321
IC302
1
ON/OFF
2
VSS
3
VOUT
4
EXT
5
VIN
6.3V100u
C312
( )
NC
C408
DG
DG DG
K1u
C322
( )
NC
C410
( )
NC
C411
Z1u
C318
Z1u C316
16V470u
C300
C309
16V220u
( )
D311 NC
( )
D310
NC
BB3.0V
BB3.0V
( )
NC
R402
DG
TP105TP104
100k
R253
DG
L300
( )
NCR401
( )
NC
C412
( )
NC
C413
( )
NC
C414
DG
K1000p
C602
K1000p
C603
DG
D10p C601
DG
DG
DG
D10p
C600
DG
BB3.0V
DG
K1000p C4
15k R4
TP20
DG
Q1
C3p
C409
K0.015u
C405
4.7k
R424
BB1.8V
560k
R422
100k
R423
Q407
DG
( )
NC
R404
( )
NC
R405
( )
NC
R406
( )
NCR409
( )
NCR410
( )
NC
R417
( )
NC
R414
( )
560
R408
( )
NC
R411
+VFET
( )
NC
C329
( )
NC C327
( )
NC C328
DG
+5V
( )
NC
R310
+5.5VF
( )
D314
DG
TP301
( )
NC
C323
( )
D315
DG
DG
( )
NCR325
( )
NC
C326
( )
D313
( )
NC
NC
NC
NC
NC
C324
( )
NC
C325
+VFET
0 R329
( )
D316
+VIN
( )
Q305
Q404
( )
NC
R326
DG
DA600
1 23
L602
68
R623
270
R624
270
R625
D301
10k
R415
DA200
NC
1 23
( )
R328
NC
( )
D317 NC
+5V
DGDG
( )
K1000p
C2
4.7k
R55
TP53
560 R3
Z0.1u C306
+VLCD
Q6
BB3.0V
+5.5VF
DG
K4.7u C331
TP302
1k
R706
BB3.0V
10k
R707
TP701 BB3.0VTP35
2.2k
R704
1k
R705
TP700
BB3.0V
DG
( )
0R181
D7
( )
NC
D312
( )
R327
NC
( )
NC
C330
IC303
NC
1
ADJ/GND
2
OUTPUT
3
INPUT
IC300
1
ADJ/GND
OUTPUT
3
INPUT
ANT2
1
2
ANT1
1
2
( )
NC
R330
( )
NC
C332
DG
Q5
B7.0pC623
K0.1u
C308
K0.1u
C915
( )
NC
C407
R309
F324
R308
F187
Q304
GATE1
SOURCE2 DRAIN3
DHTX
IDH2
DHRX
IDH1
SPCNT
ACFL
IDH2
DHRX/HFMIC HFMIC DHRX
ODH1
DHCNT
ODH2
URX UTX DCRCNT IDH1
ANT(Sub)
VREF-
UTX
3 WIRE
URX
( )
( )
( )
Land for soldering
Land for soldering
NC: No Components
TX (Handset) TX (MIC) RX (cordless handset)