Panasonic KX-TG2873BXS, Service Manual

Page: 71 / 103

71
KX-TG2873BXS/KX-TGA280BXS
Note:
(*4) (*5) Refer to Input Level (P.77)
4/4
KX-TG2873BX SCHEMATIC DIAGRAM (Base Unit_Main_4/4)
(9)
(11)
(13)
(15)
(17)
(19)
(21)
(23)
(25)
(27)
(29)
(31)
(33)
(35)
(37)
(39)
(8)
(10)
(12)
(14)
(16)
(18)
(20)
(22)
(24)
(26)
(28)
(30)
(32)
(34)
(36)
(38)
(40)
(41)
(7)
(43)
(42)
(44)
(45)
(46)
(47)
(48)
(49)
(55)
(57)
(50)
(51)
(52)
(53)
(54)
(56)
(t) (u) (v) (w) (x) (y)
(*4) (*5)
TX (Handset) RX (Speaker) RX (cordless handset)
BB3.0V
DG
DG
DG
DG
+5.5VF
DG
NC
R233
( )
( )
NC
R232
( )
NC
C221
TP227
TP223
DG
TP218
K1u
C219
K1u
C220
22K
R249
470K
R224
K0.01u
C222
K0.01u
C12
10V100u
C226
K470p
C223
K1500p
C224
56K
R228
( )
NC
C225
Q2
DG
6.8K
R225
DG
( )
NC
C229
( )
NC C230
Z0.1u
C50
DG
DG
DG
C22 Z0.1u
BB1.8VB
BB1.8VB
C18
Z0.1u
DG
C54 K1u
100 R51
K0.047u
C217
0
R603
( )
D10p C614
100K R613
1K
R616
DG
DG
DG
DG
DG
D10p C618
DG
RF3.45V
100K R607
DG
47K
R606
DG
D10p C609
DG
DG
D10p C606
D10p C610
DG
D10p C612
( )
D10p C616
( )
D10p C613
DG
( )
J15p C619
RF3.45V
D10p
C611
270
R614
TP601
( )
NC R617
1K
R608
DG
J27p C620
DG
100K
R256
D204
DG
DG
0
R58
( )
Q7
( )
Q8
DG
0
R59
+VLCD
TP7
J100p C53
270
R53
1K
R32
+5.5VF
TP45
47
R37
TP9
DG
1K
R29
1K
R26
TP47
J100p C52
TP48 TP13 TP14
1K
R23
TP6
1K
R31
DG
47
R38
TP11
TP5
TP44 TP42
1K
R27
1K
R28
TP10
J100p
C51
1K
R25
TP8
TP52
1K
R30
DG
TP12
TP3
DG
( )
NC
R54
100
R49
TP4
TP43
1K
R24
47
R39
TP49 TP15
1K
R34
Q3
DG
1.5K
R21
47K
R22
0
R60
( )
NC
R618
L600 J68p
C622
M4.7u C604
( )
M4.7u C607
( )
NC
R15
D602
D603
( )
Q4 NC
NC
K1u C608 K1u C605
IC600
1 GND1
2 GND2
3 GND3
4 TXDATA
5 RSSI
6 VCC_OC
7 GND4
8 SYCL
9 SYDA
10 SYEN
11
RXDSG
12
SYRI
13
GND5
14
GND6
15
GND7
16
GND8
17
GND9
18
GND10
19
RXDA
20
GND11
21
GND12
22
PSEL
23
PAON
24
GND13
25
VCC_PA
26
GND14
27
GND15
28
GND16
29
GND17
30
GND18
31
ANT
32
GND19
( )
C917
( )
C918
( )
C919 NC
NC
NC
NC
D200
K1u
C236
K1000p C235
DG
DG
D201
DG
J100p C231
DG
DG
D202
D203
J100p C218
K1000p C232
( )
C916
IC201
1
CD
2
VREF
3
+VIN
4
-VIN
5
VOUT
6
V+
7
GND
8
VOUT2
11K R604
10.368MHz
X2
C7p C41
C5p
C42
CN1
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22
AD[8]
AD[10]
AD[12]
AD[14]
AD[15]
AD[17]
AD[19]
AD[9]
AD[11]
AD[13]
AD[16]
AD[18]
AD[21]
KEYTONE SPOUT SPMUTE
SCL1
ANSL
TOPL
LCD_CLK
ROW1 COL4 ROW5 LCD_RST COL2 COL3 LCD_CLK STB ROW4 COL0 ROW3 ROW2 COL1 ROW0
LCDBL
LCD_TXD
SDA1
TO K EY B OA RD
SP- SP+
TP for SPEAKER
NC
Land for soldering
NC: No Components