Kenwood TM-271A Service Manual page 38

F
)
TX-RX UNIT (X57-685X-XX
R:5V
1 8
R:1.23V
VCC1 VCC2
C456 2 7 C459 C460
IN OUT
3 6 1000p 18p
2p
IN SW2
4 5
GND SW1
IC402
UPB1509GV
DIVIDER
(HETERO)
XF351
R:4.65V R:0.75V
L71-0620-05
49.95MHz
C351 R353 R354
33p 100k 330
Q351
2SC5488
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
R:4.84V RF SWITCH
RF AMP
T:5.73V
R:7.42V D409 DAN235E
Q411
2SC4649(N,P) L421 C466
100n 100p
R:0.56V
R444
1k
TP
R:2.46V
R:6.34V
MIXER
Q352
L352
R355 3SK318
G2
560n D
470
S
C359 G1
R:3.22V
8p
8R
R123
0
C102
C128
0.1u
C101
1000p
1000p
CPU
IC101
30622MAA-B85GP
H
RF AMP/
DRIVE STAGE
Q501
2SC3357
T:5.61V T:1.23V
C502 R503 C503
T:6.8V
1000p 18 100p
T:0.48V
R:7.84V
C471
10p
D501
TEMPERATURE
COMPENSATION
D351,352
RF BPF TUNING
R:3.16V R:5.86V
C367 R364 C371
150p 0 2p
8R
W/NI(EVOL1)
VOLI(EVOL12)
SPM(CPU51)
AMPSW(CPU52)
R:0.66V
WIDE(CPU65)
NARROW(CPU64)
50
AFM
49 R118 0
NC
48
IF SWITCH
NC
47
NC DAN222
46
NC
45
NC
44
CEFLS 5M
43
NC
42
NC
41
NC
40
NC
39
EMPFLS 5M
38
RXD TXD
NC
37
NC
36 R111
NC 34
1k
35
PTT 35
34
R110
RXD R109
47k
33 1.5k
TXD 5M
32
BSYFLS
5M
31
CLKFLS
30 R106
1k
PKS PKS
29 R105 1k
5C
SQC SQC
28
NC
27
NC
EEPWP
26
5M
EEPROM
IC66
R151 R152 AT24C64A10SI18
or CAT24WC64JI
10k 4.7k
1
A0
2
A1
3
A2
4
GND
C66 1000p
I
TM-271A/271E
RF AMP/
DRIVE STAGE
Q502
2SC3357
T:1.26V
C515 R516
27p
C509 0
T:7.82V
15p
T:0.88V
TEMPERATURE
COMPENSATION
D502
DA221
R510
1.5k
R371
39k
R:4.27V
RF AMP Q353
3SK318
RF BPF TUNING
R:2.88V
G2
D
R369 C380
S
G1
0 100p
R:1.44V
TV
L304
R323 R322
C321
120k 330n
100
R:6.64V
68p
L302
330n
Q302
2SC2412K
N:0V
BUFFER AMP
W:5V
CF301
WIDE
L72-0993-05
IF SWITCH
D303 D302
DAN222
C315
CF302
L72-0999-05
0.1u
R:7.99V
C311 0.1u
NARROW
C312 0.1u
R314
N:5V
W:0V
R315
W/NI(EVOL1)
AFI(EVOL12)
R269 C268
39k 1u
R:4.7mV(SQ OFF)
AF MUTE
4.97V(SQ ON)
Q253
R268
AFM(CPU50) 2SK3019
1k
Q252
2SK3019
AF MUTE
8 4.98V
VCC
7
WP
6
SCL
5
SDA
J
C516 L503 L504
820p
27n 27n
D353,354
C384
2p
PC/TV
MIC
W/NO(EVOL2)
VOLO(EVOL11)
BRI
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
C319
1000p
FM DEMODULATION
IC301
TK14489V
1
20
OSC(B) RFIN
2 19
OSC(E) GND
3 18
NC Hy_C
4
17
MIX_O SCAN
5 16
VCC
SCAN
6 15
IF_IN
SQLIN
7
14
DEC1 FLAMPO
8 13
DEC2 FLAMPI
2.2k 9 12
PH_S RSSI
18k 10 11
QUCO AFO
L301
L34-4554-05
C301
R301
4.7k
4.7u6.3
AFV
R:2.7V
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
INT(CPU18)
1/2Vcc
RESET(CPU10)
35
X57-685 2/3