Kenwood TM-271A, TМ-271E Schematics
A B C D E
TM-271A/271E
1
2
3
4
5
6
7
TX-RX UNIT (X57-685X-XX)
R403
R402
R401
C475
C476
1000p
1000p
TCXO
X401
R404
10k
16.8MHz
C404
15u6.3
L77-1944-05
10k
R406
MOD
DT(CPU53)
CK(CPU54)
PLLE(CPU3)
FROO(EVOL23)
D5,6
SURGE ABSORPTION
D6
CN2
D5
DA221
DA221
PKD
7
6
PR9
5
PR1
4
PKS
3
SQC
2
1
470p
470p
470p
C16
C17
C18
1k
1k
1k
C403
C401
100p
100p
C402
KDC
C473
L401
1000p
L403
10u
22p
C408
R407
1.5k
C406
C409
0.1u
1000p
MOD
DT(CPU53)
CK(CPU54)
5M
PKD
PR9
PR1
PKS
SQC
470p
470p
C19
C20
SCHEMATIC DIAGRAM
D402
HZU5ALL
VOTAGE
DROPPED
20
P
ROSCIN
100p
NC5
FOUT
NC1
OSCOUTVPVCCDOGNDLDNC2
123456789
C400
0.1u
C412
R:4.90V
10u6.3
10
R408
L404
R409
100k
C410
10u6.3
5C
5C
L201
5C
C201
R203
100k
C202
1000p
5C
15k
R220
R:2.48V
15k
R221
C220
4.7u6.3
Q201
2SC4919
R:0.76V
D201
DAN222
R205
820
R:4.05V
OR GATE
8C
C235
PKD
1u
10k
R236
5C
Q402,403
CHARGE PUMP
LE
FC
NC4
C411
0.1u
RIPPLE
FILTER
R:4.96V
680
R200
C163
0.1u
1
I/O
2
O/I
3
VSS
C222
0.1u
R:4.98V
Q201
AGC/
MIC MUTE
R:2.8mV
C203
*
R204
R206
100
C204
R237
0
R410
8.2k
R412
D401
1000p
IC204
BU4S66
*
R:0.1mV
10k
DATA
2.2u10
C162
1
2
3
MA2S111
CONT
C208
C416
Q402
2SA1832(GR)
Q403
2SC4738(GR)
111213141516171819
CLK
NC3
FIN
10
R415
C418
1000p
R:7.04V
C413
C414
R162
R161
4.7u6.3
VDD
R224
560
R208
1.5k
0.01u
R207
*
C206
*
C205
0.1u
D202
1SS372
I/O
O/I
VSS
IC205
BU4S66
SINGLE
ANALOG SW
R411
5.6k
1000p
10k
R413
PLL IC
IC401
MB15A02
PLL SYNTHESIZER
2SC4649(N,P)
0
0.01u
470
R416
0.1u
8C
1.5k
1.2k
W/NO(EVOL2)
5
SINGLE
ANALOG SW
4
C210
0.1u
C209 68p
678
V+
IDC
123
NJM2100V
MIC AMP/
IDC
C207
*
AGC
5
VDD
4
CONT
C421
W/NI(EVOL1)
IC201
R414
470
C417
1000p
R418
1k
C422
470p
C423
RF AMP
Q404
R:0.71V
R417
220k
470p
C442
10u6.3
C164
10u6.3
24
BLI
BLO
FRQI
FRQO
PC/TVO
PC/TVI
W/NO
W/NI
123456789
5C
4.97V
R209
240k
5
HPF
4
R232
C161
R210
18k
R211
82k
R213
330k
C231
1000p
R:3.37V
9.1k
C232
C233
R233
6.8k
4.7u6.3
R419
2.7k
R420
0.047u35
C424
8C
GND
RESET
VDDLDCLK
1000p
R212
82k
C211
820p
8C
R:7.9V
SUM AMP
R231
120k
C230
0.1u
1000p
CV
R422
10k
L405
R421
1.5k
1k
C425
0.1u35
1u16
1u
C165
DO
2VOLI
VDFref
DAT
MODI
101112
45
SPLATTER FILTER
678
C214
150p
C215
R216
DI
1/2Vcc
8C
R229
R230
220k
0
R234
C228
R425
47k
2VOLO
MODO
CV
1VOLO
BRIO
C212
123
R215
0.1u
270k
680k
10u6.3
VCC
68k
1314151617181920212223
3300p
L406
L411
270n
1200p
C213
270n
1VOLI
BRII
D403,404
RX VCO
MA2S304
D403
MA2S304
D405,406
TX VCO
D406
MA2S304
D405
MA2S304
L416
R427
100k
IC161
M62363FP
DIGITAL
POTENTIOMETER
R164 1k
R165 1k
R166 1k
IC202
BA10358FV
MIC AMP/
SPLATTER
FILTER
R214
68k
C216
39p
R217
220k
R:0.74V
RX VCO
C430
4.5p
D404
30p
C427
270n
L407
TC401
C434
L413
150p
47n
10p
C435
270n
L412
10p
TC402
R428
47k
470p
C444
R426
47k
MODI(EVOL9)
C217
10u6.3
10k
R222
BEAT
SHIFT
Q87
2SK1830
R:1.8mV(BS OFF)
5V(BS ON)
L408
33n
8p
10p
C436
0.75p
D407
1SV278
D407
MODULATION
8CL
BUFFER AMP
BA10324AFV
1
2
3
4
VCC VEE
5
6
7
R228
C227
0.01u
C90
2SK508NV(K52)
27u
L409
1p
C429
C428
470p
R429
270
T:6.8V
R430
220
C439
10p
2SK508NV(K52)
27u
L414
TX VCO
C437
470p
C438
T:4.16V
IC203
MOD BUFFA1/2Vcc
10k
C226
4700p
1k
R87
R86
3p
0
4p
C89
R:6.11V
C426
Q405
R431
Q406
0.5p
UL(CPU21)
PLLE(CPU3)
PC/TVO(EVOL3)
DC
AMP
14
13
12
11
10
9
8
R227
22k
X86
L78-1409-05
8.00MHz
R:0.97V
5p
C431
T/R SW
2SJ347
R:6.96V
470p
100k
C448
T:0.82V
11p
C440
8C
MOD
MOD
PC/TV
MODO(EVOL10)
C218
10u6.3
82k
R218
R225
150k
R226
100k
R219
180k
C225
1u16
C87
C88
T:0.62V
C432
0.3p
27u
L410
220
R423
Q407
C441
0.5p
27u
L415
100
R424
R:7.98V
R433
4.7k
LIPPLE
FILTER
EVLLD(CPU8)
MICMT(CPU77)
3p
4p
2SK1830
D408
MA2S111
PLLE(CPU3)
P9MT(CPU75)
BEAT
SHIFT
Q86
BUFFER AMP
2SC5108(Y)
R436
C452
Q408
KRX102U
T/R SW
2SC2412K
C449
470p
UL(CPU21)
TX/RX (CPU20)
Q410
120k
470p
LIPPLE
FILTER
Q440
C450
R:7.01V
22u10
TH97
5M
R:4.92V
T:3.9mV
R:7.7V
-t
100k
L417
R432
C451
R:6.17V
C454
33n
L418
100
R435
0
R434
1k
8CL
470p
DT(CPU53)
CK(CPU54)
MIC
W/NO(EVOL2)
W/NI(EVOL1)
VOLO(EVOL11)
VOLI(EVOL12)
BRI
P9MT(CPU75)
M1MT(CPU76)
MICMT(CPU77)
R93
6.8k
10k
R94
C97
TH98
1000p
PLLE(CPU3)
QT/DQT(CPU1)
EVLLD(CPU8)
TX/RX (CPU20)
UL(CPU21)
TX DTMF
XOUT(CPU11)
XIN(CPU13)
BSHIFT
1/2Vcc
6p
3p
C455
C453
220p
-t
C98
100k
1000p
34
X57-685 1/3
JIHGF
TX-RX UNIT (X57-685X-XX)
R:5V
220p
IC402
470
100
0.1u
R124
VCC2VCC1
R:4.65V
47k
OUT
SW2
SW1
8
7
6
R353
100k
Q351
2SC5488
IF AMP
8TC(CPU80)
8RC(CPU76)
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
DTMF IN(CPU95)
L423
5M
RSSI(CPU92)
SQIN(CPU93)
SBC(CPU82)
C458
C459
1000p
1k
R437
5C
R:0.75V
R354
330
P9MT
P1MT
MICMT
NC
8RC
8TC
NC
SBC
NC
NC
NC
CM
MICKEY2
MICKEY
VOL
TEMP2
TEMP1
RSSI
SQIN
AVSS
DTMF IN
VREF
AVCC
NC
NC
NC
TONE
123456789
BSHIFT
1/2Vcc
1
C456
2
IN
3
2p
IN
45
GND
C457
1000p
UPB1509GV
DIVIDER
(HETERO)
C351
33p
R351
C353
R352
0.01u
DT(CPU53)
CK(CPU54)
PC/TV
MIC
W/NO(EVOL2)
W/NI(EVOL1)
VOLO(EVOL11)
VOLI(EVOL12)
BRI
P9MT(CPU75)
M1MT(CPU76)
MICMT(CPU77)
47k
R127
CM
87
MICKEY
88
VOL
89
R91
1k
R92
1k
L101
C104
R:4.98V
PLLE(CPU3)
QT/DQT(CPU1)
EVLLD(CPU8)
TX/RX (CPU20)
UL(CPU21)
TX DTMF
XOUT(CPU11)
XIN(CPU13)
POWER
17
C474
L419
C354
74
ENCA
DTMF
1000p
R:1.23V
C460
18p
100n
4.5p
73
R125
ENCB
PLLENCNC
5M
22k
R438
XF351
L71-0620-05
49.95MHz
C355
71
47k
NC
DI(from LCD)
CNVSS
5M
SCHEMATIC DIAGRAM
RF AMP
R:7.42V
Q411
2SC4649(N,P)
R:0.56V
47k
100
R439
C461
R440
1000p
R355
470
3p
18p
C356
C358
C357
0.01u
8R
70
68
69
C128
1000p
CL
CE
NC
NC
DO(to LCD)
GND
CNVSS
EVLLD
BSHIFT
RESET
101112131415161718192021222324
47k
R101
C462
L420
150n
TP
1k
R356
R:6.34V
L352
560n
L351
820n
C359
8p
R358
220
1000p
C366
0.1u
47k
R126
ADJ
WIDE
NARROW
CPU
IC101
30622MAA-B85GP
XOUT
VSS
XIN
0
C82
C83
R82
0.1u
5M
L421
100n
10p
100
R441
100
R442
8C
R123
0
C102
0.1u
C101
1000p
NC
VSS
VCC
GNDNCPOWER
R102
1000p
R:4.84V
T:5.73V
D409
C466
100p
22p
R443
C465
C464
1000p
C463
1000p
R:2.46V
MIXER
3SK318
D
S
R:3.22V
0
R121
R120
R122
*
VCC
DST3
DST4
INTNCTX/RXULNCNCEEPSDT
1k
47k
R103
R81
47k
5M
RF SWITCH
2.2k
8R
Q352
G2
C362
1000p
R119
*
*
DST1
DST2
R104
DAN235E
R444
C467
C360
G1
C363
NC
1k
1k
1000p
1000p
0.01u
TM-271A/271E
RF AMP/
DRIVE STAGE
Q501
2SC3357
R502
1k
1000p
C364
470k
C367
150p
D351
C368
R365
100k
C370
1000p
WIDE(CPU65)
R118
TXDRXD
R111
R109
1.5k
R106
R105
R152
C151
1800p
R503
C503
18
100p
270
R504
D501
1SS355
D501
TEMPERATURE
COMPENSATION
1000p
R364
0
HVC376B
C369
27p
8R
W/NI(EVOL1)
VOLI(EVOL12)
SPM(CPU51)
AMPSW(CPU52)
0
R114
1k
R110
47k
1k
PKS
1k
SQC
4.7k
C152
T:1.23V
270
R505
C504
RF BPF TUNING
3p
L354
5M
5M
47k
34
35
5M
5M
3900p
2.2k
1000p
D351,352
C371
R366
50n
R367
C375
C509
T:6.8V
15p
T:0.48V
C506
1000p
C374
6p
C373
D352
R:0.66V
C316
IF SWITCH
DAN222
R321
C318
0.1u
EEPROM
IC66
AT24C64A10SI18
or CAT24WC64JI
A0
A1
A2
GND
C66
1000p
L501
C507
1000p
R369
0
27p
HVC376B
R368
C376
N:0V
W:5V
0.1u
D303
22k
VCC
WP
SCL
SDA
68n
8T
100k
1000p
R318
10k
R320
8
7
6
5
10
R507
10k
R506
C505
1000p
2p
50n
470
L355
100
C372
1000p
1000p
5C
5M
1
2
R70
47k
3
4
T:5.61V
C502
1000p
R:7.84V
C471
10p
R501
56n
L422
C468
220p
C501
8R
R360
R359
R361
CK
8R
C361
470k
R362
1000p
220k
R363
330k
180
NARROW(CPU64)
51525354555657585960616263646566676869707172737475
DT
50
SPM
AFM
AMPSW
49
NC
48
NC
47
NC
46
NC
45
NC
44
CEFLS
43
NC
42
NC
41
NC
40
NC
39
EMPFLS
38
NC
37
NC
36
NC
35
PTT
34
RXD
33
TXD
32
BSYFLS
31
CLKFLS
30
PKS
29
SQC
28
NC
27
NC
EEPWP
26
EEPCK
25
R151
10k
T:1.26V
C510
22
R509
R510
1.5k
RF AMP
R:1.44V
R323
120k
Q302
2SC2412K
BUFFER AMP
CF301
L72-0993-05
CF302
L72-0999-05
10k
C317
R:4.7mV(SQ OFF)
4.97V(SQ ON)
47
8p
R511
TEMPERATURE
COMPENSATION
C511
1000p
R:4.27V
Q353
3SK318
D
S
56
R370
TV
N:5V
W:0V
0.1u
W/NI(EVOL1)
AFI(EVOL12)
AFM(CPU50)
4.98V
RF AMP/
DRIVE STAGE
Q502
2SC3357
R512
D502
DA221
G2
G1
C377
L304
330n
R:6.64V
R317
D302
DAN222
10k
R319
10
R371
39k
47k
R372
1000p
WIDE
10k
IF SWITCH
NARROW
R268
1k
T:7.82V
T:0.88V
C512
C378
C324
L303
C323
R316
R269
39k
1000p
1000p
0.01u
330n
270p
22k
L502
C513
1000p
8R
R373
R374
R322
100
R:7.99V
C314
AF MUTE
Q253
2SK3019
C267
AF MUTE
47k
R:2.88VR:5.86VR:3.16V
C380
100p
27k
0.01u
C268
1u
0.47u
Q252
2SK3019
C515
R516
C516
820p
27p
0
68n
R513
2.2k
0
R514
C514
1000p
C379
1000p
D353,354
RF BPF TUNING
C384
D353
HVC376B
L356
4.5p
C381
27p
C382
R375
100k
C383
1000p
8R
8C
C321
68p
L302
C319
330n
1000p
C322
56p
0
R324
C315
0.1u
C311 0.1u
C312 0.1u
R314 2.2k
R315 18k
L301
15u6.3
C250
L34-4554-05
C301
4.7u6.3
0.1u
15k
R:2.7V
R249
12k
150k
R250
R246
120k
R247
C313
L503
27n
C518 33p
C517 3p
2p
50n
8p
C385
FM DEMODULATION
50,4MHz
1
OSC(B)
2
OSC(E)
3
NC
4
MIX_O
5
VCC
6
IF_IN
7
DEC1
8
DEC2
9
PH_S
10
QUCO
C249
4.7u6.3
5.6K
R248
PR1
L504
C519 82p
D354
HVC376B
36p
C386
R376
C387
PC/TV
W/NO(EVOL2)
VOLO(EVOL11)
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
IC301
TK14489V
RFIN
GND
Hy_C
SCAN
SCAN
SQLIN
FLAMPO
FLAMPI
RSSI
AFO
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
INT(CPU18)
RESET(CPU10)
27n
MIC
BRI
R301
4.7k
R302
C302
C326
1/2Vcc
L357
100k
1000p
20
19
18
17
16
15
14
13
12
11
AFV
0.01u
35.5n
4.7k
1000p
33k
R325
35
X57-685 2/3
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