Kenwood TM-471A Service Manual page 38

F
)
TX-RX UNIT (X57-6863-XX
RF SWITCH
RF AMP
R:4.86V D409
R:7.03V T:4.5V DAN235E
Q411
R:1.7V
C466
2SC5108(Y) R445
* C456
0
5p
XF351
R:4.27V R:0.76V
L71-0620-05
C351 R353 R354 49.95MHz
33p 100k
560
Q351
2SC5108(Y)
IF AMP
DT(CPU53)
CK(CPU54)
PC/TV
MIC
W/NO(EVOL2)
W/NI(EVOL1)
VOLO(EVOL11)
VOLI(EVOL12)
BRI
8TC(CPU80)
8RC(CPU76)
5M
P9MT(CPU75)
M1MT(CPU76)
76
P1MT
77
MICMT(CPU77)
MICMT
78
NC
79
8RC
80
8TC
81
NC
82
SBC
83
NC
84
NC
R124
85
NC
47k
86
CM
87
CM
87 MICKEY2
MICKEY 88
88 MICKEY
89
VOL
89 VOL
R91 90
TEMP2
1k
91
TEMP1
R92 92
RSSI
1k
93
SQIN
94
AVSS
95
DTMF IN
L101 96
VREF
97
R:4.98V
AVCC
98
NC
99
NC
100
NC
PLLE(CPU3) CNVSS
5M
QT/DQT(CPU1)
EVLLD(CPU8)
TX/RX (CPU20)
UL(CPU21)
TX DTMF
XOUT(CPU11)
XIN(CPU13)
POWER
17
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
BSHIFT
1/2Vcc
G
SCHEMATIC DIAGRAM
RF SWITCH
Q500
T:5.26V 2SC5110(O) T:7.1V
* C502 C509
4p
T:0.98V
* L470
TP
TH351
-t
R:7.3V
3.3k R:1.15V
L352
MIXER
R355
G2
680 0.47u D
Q352
3SK255
C359
R:0.33V S G1
12p
8R
R123
0
C102
C128
0.1u
C101
1000p
470p
AFM
NC
NC
NC
NC
NC
CEFLS
NC
NC
NC
NC
CPU
EMPFLS
IC101
NC
30622MAA-B85GP
NC
NC
PTT
RXD
TXD
BSYFLS
CLKFLS
PKS
SQC
NC
NC
EEPWP
H
RF AMP/
PREDRIVE AMP
Q501
2SC3356(R24)
T:0.17V T:7.15V
C516
3p
T:0.11V
D502
DA221
TEMPERATURE
COMPENSATION
R:3.54V
RF AMP Q353
D351,352
3SK255
RF BPF TUNING R:7.25V
R:2.45V
D
R364 C367 * C371 C374 * L357
S
0 7p
470p
R:0.82V
8R
TV
W/NI(EVOL1)
VOLI(EVOL12)
SPM(CPU51)
AMPSW(CPU52)
R:0.66V
WIDE(CPU65)
NARROW(CPU64) 2SC2412K
W:4.96V
BUFFER AMP
N:0V
50
49 R118 0
48
IF SWITCH
47 D303
DAN222
46
45
44
5M
43
42
41
40
39
5M
38
RXD TXD
37
36 R111
34
1k
35
35
34
R110
R109
47k
33 1.5k
5M
32
5M
31
30 R106
1k
PKS
5C
29 R105 1k
SQC
28
27
26
R:4.7mV(SQ OFF)
4.97V(SQ ON)
AFM(CPU50)
5M
EEPROM
IC66
AT24C64A10SI18
R151 R152
or CAT24WC64JI
10k 4.7k
1
8
A0 VCC
2 7
A1 WP
3
6
A2 SCL
4 5
GND SDA
C66
470p
I
TM-471A
R522
0
T:7.32V
T:1.6V
L504
* C523 * R525 C526
10n
9p
Q502
2SK2596
RF AMP/
DRIVE AMP 1
T:5.11V
VOLTAGE
PROTECTION
R370
47k
D353-355
RF BPF TUNING
G2
C380 R375 C383 R377 C386
G1 470p 0 0
R:1.43V 0.5p 0.75p
L304
R323 R322
C321
120k 330n
100
R:6.6V
68p
L302
C319
330n
1000p
Q302
FM DEMODULATION
CF301
WIDE
L72-0993-05
1
IF SWITCH
2
D302
3
DAN222
C315
4
CF302
L72-0999-05
0.1u
5
R:7.95V
6
7
C311 0.1u
NARROW
C312 0.1u 8
R314 2.2k 9
W:0V
N:4.96V
R315 18k 10
L301
L34-4554-05
C301
W/NI(EVOL1)
4.7u6.3
AFI(EVOL12)
R269 C268
39k 1u
AF MUTE
Q253
R268
2SK3019
R:2.7V
1k
Q252
2SK3019
AF MUTE
4.98V
X57-686 2/3
J
L505
5n
* C390
R381
0
R:2.2V
PC/TV
MIC
W/NO(EVOL2)
VOLO(EVOL11)
BRI
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
IC301
TK14489V
20
OSC(B) RFIN
19
OSC(E) GND
18
NC Hy_C
17
MIX_O SCAN
16
VCC
SCAN
15
IF_IN
SQLIN
14
DEC1 FLAMPO
13
DEC2 FLAMPI
12
PH_S RSSI
11
QUCO AFO
R301
4.7k
AFV
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
INT(CPU18)
1/2Vcc
RESET(CPU10)
35