Kenwood TM-281A Service Manual page 37

F
TX-RX UNIT (X57-8130-XX)(A/2): TX-RX SECTION
R:5.00V
R:2.51V
1 8
VCC1 VCC2
C62 2 7 C65 C67
IN OUT
2p 3 6 1000p 18p
IN SW2
4 5
GND SW1
IC2
UPB1509GV
DIVIDER
L71-0655-05
R:7.52V
R:0.71V
XF501
C527 R524
R525
5p 390k 270
IF AMP
Q503
KTC4080E-P
DT(CPU53)
CK(CPU54)
PC/TV
MIC
W/NO(EVOL2)
W/NI(EVOL1)
VOLO(EVOL15)
VOLI(EVOL13)
BRI
8TC(CPU80)
8RC(CPU76)
5M
76
NC
77
MICMT(CPU77)
MICMT
78
NC
79
8RC
80
8TC
81
NC
82
SBC
83
NC
84
NC
R753
85
NC
47k 86
CM
87
MICKEY2
CM
88
MICKEY
MICKEY
89
VOL
VOL
R750 1k 90
TEMP2
R751 1k 91
TEMP1
92
RSSI
93
SQIN
94
AVSS
95
DTMF IN
L702
96
VREF
97
AVCC
R:4.94V
98
NC
99
NC
100
NC
PLLE(CPU3)
CNVSS
QT/DQT(CPU1)
5M
EVLLD(CPU8)
TX/RX (CPU20)
UL(CPU21)
TX DTMF
XOUT(CPU11)
XIN(CPU13)
POWER
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
BSHIFT
1/2Vcc
G
SCHEMATIC DIAGRAM
D9,10
R:4.82V
RF AMP RF SWITCH T:5.55V
T:4.76V
R:5.96V
D9 HSC277
Q10
2SC5108(Y)F C72
18p
R:1.81V
D10 HSC277
R528
1k
BPF
R:2.48V
MIXER
Q504
R531 L507
3SK318
100 390n
R:1.23V
R536
560
C545
13p
8R
R:4.94V
R763
0
C768
C765
0.1u
C769
1000p
1000p
MCU
IC707
30622MEP540GU
RESET
H
R307 C308 L302
0 1200p 22n
R:5.59V
R532 C546
0 27p
D505,506
R:3.20V RF BPF TUNING
C551 R542 C555 C560
100p 0 1p 1000p
W/NI(EVOL1)
VOLI(EVOL13)
SPM(CPU51)
AMPSW(CPU52)
R:0.71V
WIDE(CPU65)
NARROW(CPU64)
W:4.90V
N:0V
SQ ON:0V
SQ OFF:4.94V
50
AFM
49 R773
NC
0
48
IF SWITCH
NC
D501
47
MC2858-T111
NC
46
NC
CE
45
NC
44 R843
CEFLS 5M
43 47k
NC
42
NC
41
NC
EPM
40
NC
39 R841
EMPFLS
5M
47k
38
NC RXD TXD
37
NC
36 R775
RXD
NC
35 1k
PTT PTT
34
R780
RXD BUSY R776
1.5k 47k
33
TXD 5M
32
R844
BSYFLS 5M
10k
31 R842
CLKFLS
R777
10k
30 10k
RXD1 5M
29
R778
TXD1 5M 5C
10k
28
NC
27 SCLK
NC
RD1
26
TD1
EEPWP
5M
EEPROM
R772 R774
IC708
EX24064ASAS0A
10k 4.7k
1
A0 VCC
2
A1 WP
3
A2 SCL
4
VSS SDA
C776
1000p
I
TM-281A
X57-8130-XX R766
-10 K 0
-21 M2 NO
L305
-22 M3 NO
10n
-23 M4 NO
R550
R:7.07V
10k
RF AMP
Q505
D508,509
3SK294-FP
R:6.78V
R:2.85V RF BPF TUNING
R547 C568 C573
0 100p
8R
TV
2SK1830F
PC/TV SWITCH
R:7.04V
R501 L502 R502
C505
120k 330n 100
68p
L504 C507
330n
0.01u
Q501
KTC4080E-P
TRIPLER
WIDE
R:5.00V
CF501
1
IF SWITCH
C584 C585 OSCIN
D502
2
OSCOUT
0.1u 0.1u
MC2858-T111
C514 0.1u
3
MIXOUT
4
VCC
CF502
0.1u 5
C586 C587 C515
IFIN
C517 0.1u 6
0.1u 0.1u DEC
NARROW
7
FILOUT
8
FILIN
W:0V
N:4.90V
C516
330p
R511
22k
C519
W/NI(EVOL1)
10u
VOLI(EVOL13)
R783 C778
39k 1u
AF MUTE
Q704
R782 2SK3019
AFM(CPU50)
R:2.19V
1k
Q705
2SK3019
4.94V
AF MUTE
8
7
6
5
X57-813 (A/2) 2/3
J
R767 R768
0 0
NO NO
NO
0
0 0
4p
R557
TV
100k
R559
Q506
27k
T:4.87V
PC/TV
MIC
W/NO(EVOL2)
VOLO(EVOL15)
BRI
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
FM IC
IC501
UA31136L
16
MIXIN
15
GND
14
N-REC
13
N-DET
12
RSSI
C522
11
IFOUT
27p
10
QUAD
9
AFOUT
C518
100p
FILOUT
R514
4.7k
AFV
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
INT(CPU18)
1/2Vcc
RESET(CPU10)
37