Kenwood TM-271A Service Manual page 41

TX-RX UNIT (X57-685X-XX)
R414
Q402,403 470
CV
CHARGE PUMP RX VCO R:0.74V BUFFER AMP
D403,404 T:0.62V
C430 4.5p Q410
D402 R410 RX VCO
R:6.11V R:0.97V 2SC5108(Y)
Q402 Q405
HZU5ALL 8.2k 2SA1832(GR) R418 R419 R421 L405 L406 D404 C426 L408 2SK508NV(K52) C432
CV
VOTAGE Q403 33n
DROPPED R412 2SC4738(GR) 1k 2.7k 1.5k 270n MA2S304 30p 0.3p
R403 1k 10k
R402 1k
R401 1k
R:7.01V
T/R SW
R429
PLL IC
270
IC401 Q407 Q408
TCXO MB15A02 T:6.8V 2SJ347 KRX102U
R430
X401 KDC PLL SYNTHESIZER
R404 220 R:6.96V
10k
16.8MHz D405,406 C439
10p
RF AMP TX VCO T/R SW
T:0.82V
R415 Q404 R:0.71V D406 C434 L413 Q406
2SC4649(N,P) L411 MA2S304 150p 47n 2SK508NV(K52) C441
L77-1944-05 L403 C411 0
R:7.04V 270n 0.5p
10u C412
R:4.90V 0.1u
TX VCO
10u6.3
LIPPLE
RIPPLE
FILTER
FILTER
R:7.98V Q440
R409 T:4.16V 2SC2412K
D407
100k R:4.96V
MODULATION
L416 R428
47k
LIPPLE
FILTER
R425 R426
47k 47k 8CL
UL(CPU21)
PLLE(CPU3)
MOD MOD
DT(CPU53)
CK(CPU54)
5C
D5,6
SURGE ABSORPTION
IC161
5M
M62363FP
DIGITAL
POTENTIOMETER
D5 D6
CN2 DA221 DA221
7 PKD
PKD 5C
6 IC204
BU4S66
5 PR9 5C
R164 1k
PR9 1 5 4.97V
4 PR1 I/O VDD R165 1k
PR1 2
O/I SINGLE R166 1k
3 PKS
PKS 3 4 ANALOG SW
2 SQC VSS CONT
SQC C210 R210
1
C222 R224 0.1u 18k
C209 68p
0.1u 560
R211
R209 R212
R208 240k 82k 82k
5C 1.5k
R:4.98V
IDC IC202
SPLATTER FILTER BA10358FV
MIC AMP/
SPLATTER
HPF
R:2.48V FILTER
8C
C213
IC201
* R207 NJM2100V 3300p
R215 R214
Q201 MIC AMP/
AGC/ IDC
68k 68k
MIC MUTE
R:2.8mV * C206
Q201
* R:7.9V
2SC4919 C203
BUFFER AMP DC
C205
SUM AMP C216 IC203 AMP
0.1u BA10324AFV
R:0.76V 39p
DI R217 1 14
D201 D202
R:0.1mV
DAN222 1SS372 220k 2 13
R206
R205 3
1/2Vcc 12
100
820 8C 4 11
VCC VEE
R:4.05V
5 10
OR GATE AGC
6
9
8C
7 8
R:3.37V
1/2Vcc MOD BUFFA
R228 R227
10k 22k
C235 R237 1 5
PKD I/O VDD
1u
0 2
O/I
3 4
VSS CONT
IC205
BU4S66
5C
SINGLE BEAT X86
SHIFT L78-1409-05
ANALOG SW 8.00MHz
C90 C87 BEAT
Q87
2SK1830 SHIFT
3p R86 3p
0
Q86
2SK1830
R:1.8mV(BS OFF)
5V(BS ON)
R:5V
RF AMP R:4.84V RF SWITCH T:5.61V T:1.23V
T:5.73V
Q411 R:7.42V D409 DAN235E
R:6.17V 1 8 R:1.23V C502 R503 C503
VCC1 VCC2 2SC4649(N,P) L421 C466
C454 C456 2 7 C459 C460 1000p 18 100p
IN OUT
100n 100p
6p 2p 3 6 1000p 18p R:7.84V
IN SW2 R:0.56V
4 5 R444 C471
GND SW1
1k 10p
IC402
UPB1509GV
DIVIDER
(HETERO)
L417 D501
TEMPERATURE
R432 COMPENSATION
1k
TP
R:4.92V R:2.46V
T:3.9mV XF351 R:6.34V
R:4.65V R:0.75V MIXER
L71-0620-05 Q352
C351 R353 R354 49.95MHz R355 L352 D351,352
3SK318
R:3.16V RF BPF TUNING
33p 100k 330 470 560n D G2
C367 R364
S
C359 R:3.22V G1 150p 0
8p
Q351
2SC5488
IF AMP
R:7.7V
8R 8R
DT(CPU53) DT(CPU53)
CK(CPU54) CK(CPU54)
PC/TV
MIC MIC
W/NO(EVOL2) W/NO(EVOL2)
W/NI(EVOL1) W/NI(EVOL1) W/NI(EVOL1)
VOLO(EVOL11) VOLO(EVOL11)
VOLI(EVOL12) VOLI(EVOL12) VOLI(EVOL12)
BRI BRI
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
5M R123
0
C102
C128
0.1u
P9MT(CPU75) P9MT(CPU75) C101
1000p
M1MT(CPU76) M1MT(CPU76)
1000p WIDE(CPU65)
NARROW(CPU64)
76 50
AFM
P1MT
MICMT(CPU77) MICMT(CPU77) 77 49 R118 0
MICMT NC
78 48
NC NC
79 47
8RC NC
80 46
8TC NC
81 45
NC NC
82 44
SBC CEFLS 5M
83 43
NC NC
84 42
NC NC
R124 85 41
NC NC
47k 86 40
CM NC
CM 87 39
87 MICKEY2 CPU EMPFLS 5M
MICKEY 88 IC101 38 RXD TXD
88 MICKEY NC
R93 89 30622MAA-B85GP 37
VOL
89 VOL NC
6.8k R91 90 36 R111
TEMP2 NC 34
1k
91 35 1k
TEMP1 PTT 35
R92 92 34
RSSI RXD R109 R110
1k
93 33 1.5k 47k
SQIN TXD 5M
94 32
AVSS BSYFLS 5M
95 31
DTMF IN CLKFLS
L101 96 30 R106 1k
VREF PKS PKS
97 29 R105
R:4.98V 1k
AVCC SQC SQC
98 28
NC NC
99 NC 27
NC
100 EEPWP 26
NC
PLLE(CPU3) PLLE(CPU3) CNVSS
5M
QT/DQT(CPU1) QT/DQT(CPU1)
R151 R152
EVLLD(CPU8) EVLLD(CPU8)
10k 4.7k
TX/RX (CPU20) TX/RX (CPU20)
UL(CPU21) UL(CPU21)
TX DTMF TX DTMF
XOUT(CPU11) XOUT(CPU11)
XIN(CPU13) XIN(CPU13)
17 POWER
RSSI(CPU92)
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
BSHIFT BSHIFT
1/2Vcc 1/2Vcc
F501
RF AMP/ RF AMP/
R:13.8V
DRIVE STAGE DRIVE STAGE T:13.45V
Q501 Q502
2SC3357 T:1.26V 2SC3357
C515 R516 C516 L503 L504
820p
T:6.8V C509 T:7.82V 27p 0 27n 27n C526
15p 680p
T:0.48V T:0.88V R522 FINAL AMP
330
Q504
RD70HVF1-01
C533 L507 L508
100p 1T 2.5T
TEMPERATURE Q503
COMPENSATION PD55003TR
DRIVE AMP
D502 T:1.6V T:1.45V
DA221
R510 R520 R523
18k 39k
1.5k
R371
39k
R:4.27V
VOLTAGE
PROTECTION
RF AMP Q353
3SK318 D353,354
T:2.5V
R:5.86V G2 R:2.88V RF BPF TUNING
D
C371 R369 C380 C384
S
2p 0 G1 100p 2p
R:1.44V
PC/TV SW
Q354
2SK1830 T:4.97V
C388 C391
T:7.84V
7p 16p
R:0.87V
TV R379 TV PC R532 R531 R529
100k 0 47k 470
PC/TV PC/TV
MIC MIC
W/NO(EVOL2) W/NO(EVOL2)
VOLO(EVOL11) VOLO(EVOL11)
BRI BRI
8TC(CPU80) 8TC(CPU80)
8RC(CPU76) 8RC(CPU76)
SPM(CPU51) SPM(CPU51)
AMPSW(CPU52) AMPSW(CPU52)
R323 L304 R322
C321 DETECTION
120k 330n 100
R:6.64V 68p D301
L302 R:4.02V MA742
R:0.66V C319 8TC
C309
330n
1000p
0.022u
Q302
2SC2412K
N:0V R306
BUFFER AMP
W:5V
FM DEMODULATION 270k
IC301
NOISE AMP/
CF301 TK14489V
SQL AMP
L72-0993-05 WIDE 1 20
OSC(B) RFIN R:1.74V Q301
2SC2412K
IF SWITCH IF SWITCH 2 19 C306
OSC(E) GND R:1.15V
D303 D302 1000p
DAN222 DAN222 3 18
NC Hy_C
C315 4 17
CF302 MIX_O SCAN
L72-0999-05
R:7.99V 0.1u 5 16
VCC SCAN
6
15
IF_IN SQLIN
C311 0.1u 7 14
NARROW DEC1 FLAMPO
C312 0.1u 8 13
DEC2 FLAMPI
R314 2.2k 9 12
N:5V
PH_S RSSI
W:0V R315 18k 10 11
QUCO AFO
C258 R258 C256
0.01u 2.7k 0.018u
L301 AUDIO
FILTER IC251
L34-4554-05
BA10324AFV R256
R259 1 14 5.6k
12k 2 13
12
C301 3
W/NI(EVOL1) R301
4 11
4.7k VCC VEE
4.7u6.3
5 10
AFI(EVOL12) AFV
9 R251
6
7 8 47k
5C
R269 C268
RX
39k 1u
R:3.37V C253 R253
R:4.7mV(SQ OFF) AF MUTE 1/2Vcc 0.22u 0
4.97V(SQ ON) R:7.95V
Q253 R264
AFM(CPU50) R268 2SK3019 8C 120k
1k R:2.7V Q251
5M R:3.3V
2SC2412K
Q252 C264
EEPROM
2SK3019 0.033u
IC66
AT24C64A10SI18 BUFFER
or CAT24WC64JI AF MUTE AMP
R265
1 8 4.98V R:2.7V
A0 VCC
5.6k
2 7
A1 WP LIMITTER
3
6 D251
A2 SCL
4 5 MA742
GND SDA
R275
15k
C66 1000p
RSSI(CPU92)
SQIN(CPU93) SQIN(CPU93)
DTMF IN(CPU95) DTMF IN(CPU95)
SBC(CPU82) SBC(CPU82)
INT(CPU18) INT(CPU18)
1/2Vcc 1/2Vcc
RESET(CPU10) RESET(CPU10)
R800
C623
ANT SW
3p
D602
C554 MA4PH633 C603 L602 L603 L604
1000p 1000p 5T 5T 5T
T:1.46V
T:7.85V
T:0.76V
D606,607
APC VOLTAGE
DETECT
D606 D607
MA742 MA742 D1-4
D603,605 SURGE ABSORPTION
ANT SW 5M
APC CONTROLLER
IC501
TA75W01FU
POWER
5 4
T:7.55V
VEE CN1
6 3 R605 R607 D608
MIC R1 0 18
330
7 2 15k 1SS355 17
8 1 TEMPERATURE
16
VCC COMPENSATION
PTT R2 100 15
35
BRI 14
R528
RXD R3 100 13
34
470 POWER
12
17
VOL R4 1k 11
89
8C 10
8C
5C
9
5C
DO 8
70
CL 7
68
CE 6
69
DI 5
MIC 71
MICKEY R5 1k 4
88
ENCB 3
R6 1k
73
CM R7 1k 2
87
BRI ENCA R8 1k 1
74
AUDIO AMP
IC252
LA4600
R313
100k 10 9 8 7 6 5 4 3 2 1
VOLO(EVOL11) C273 R277 R278 C274
1u 68k 12k 0.22u
R279 Q254 J1
SPM(CPU51)
DTC363EU
4.7k
AF MUTE
CN5
AMPSW(CPU52) Q255
KRC102S
AF MUTE
KEC
Q35,36 8T
T:7.84V D32
DC SW (8T) Q35
KTA1664(Y) CURRENT
R36 PROTECTION
Q36
KRC102S 1.5k KEC R:13.66V DC SW (SB)
T:12.94V 1000p
R35 C37
8TC(CPU80) R37 R:13.8V
D32
0 47k 1812L110PR Q31
2SA1641(S,T) F1
R:7.9V B
KEC
1,1A SB
8R VOLTAGE
Q33,34 Q33 REGULATOR E
2SA1745(6,7) (8C)
DC SW (8R)
R34 8R 8C IC31
Q34
KRC102S R:7.9V KIA7808AF
4.7k DC SW (SB)
R33 3 1
8RC(CPU76) Q32 D31
OUT IN KRC102S
47k COM REVERSE
CONNECTION
KEC
KEC 2 VOLTAGE PROTECTION
REGULATOR
8C (5M)
5C
IC32 IC33
NJM78L05UA NJM78L05UA
R:4.98V R:4.98V
1 3 5M 1 3
5C OUT IN OUT IN
COM VOLTAGE COM
2 REGULATOR 2
(5C)
5M
IC35 IC34
OVER VOLTAGE
BD4740G BD4732G
DETECTION
1 5 1 5 R:4.98V
D62 R63 NC VCC NC VCC
5C 2 2
R:4.31V 0 SUB SUB
MA2S077 3 3 4
4
GND VOUT GND VOUT
Q61 D61 R61
KRC404RTK
02DZ18(X,Y) 470
OVER VOLTAGE OVER VOLTAGE VOLTAGE VOLTAGE
DETECTION DETECTOR DETECTOR
KEC DETECTION
(INT) (RESET)
FB
SBC(CPU82)
INT(CPU18)
RESET(CPU10)
DISPLAY UNIT (X54-3450-10)
LCD (B38-0885-05)
MR VFO CALL
MHz & MENU
ADJUASTMENT
S1
W02-3665-05
C39 REV Func
ENCODER
0.1u
D31
R55
0
1SS355
R47
47k
49
32
NC
50 SEG27 31
KI1
J1 SEG26
51 30
8 MBL(Key A) KI2 SEG25
R48 52 29
8C 4.96V
GND KI3 SEG24
PTT 47k 53 28
ON/OFF & VOLUME NC SEG23
ME ADJUASTMENT
MIC 54 27
HOOK 4.94V NC SEG22
55 26
CM
1 VR1 NC LCD CONTROLLER SEG20
R31-0646-05 R46 56 25
VDD SEG20
IC3
CN1 100 57 PT6554LQ 24
VDD1 SEG19
18 MIC 58 or 23
LC75854W
17 ME VDD2 SEG18
59 22
VSS SEG17
16 GND
VARIABLE 60 21
RESISTOR OSC SEG16
15 PTT 61 20
DO (to cpu)
14 BRI SEG15
62 19
CE SEG14
13 RXD 63
SEG13 18
CL
12 POWER 64 SEG12 17
CP1 DI (from cpu)
11 VOL
R90-0724-05
10 8C 4.96V
9 L1
5C
8 DO
7 CL
6 CE R21 R22 R23
5 DI(from LCD) 10k 10k 10k
4 MIC KEY
3 ENCODER B
2 CM LCD BACKLIT SWITCH LCD ILLUMINATION
7.90V 7.90V Q9 7.10V
1 ENCODER A D19 D20 D21
2SB1132(Q,R) R49
56 B30-2205-05 B30-2205-05 B30-2205-05
KEY ILLUMINATION KEY BACKLIT SWITCH
D22 D23 D24
Q10 R41
D2 D3 D4 KRA225S 7.30V
R10
56 B30-2205-05 B30-2205-05 B30-2205-05
1.2k
B30-2205-05 D25 D26 D27
R50
D2-4
56 B30-2205-05 B30-2205-05 B30-2205-05
KEY BACKLIT
4.80V(BRIGHTNESS MAX)
Q6 D28 D29 D30
0V(BRIGHTNESS OFF) R54
KRC102S Q12
UMG3N 56 B30-2205-05 B30-2205-05 B30-2205-05
DC SWITCH
R8 D19-30
5.02V
LCD BACKLIT
1k
DIMMER
FUNCTION
SWITCH
X57-685X-XX C203 C206 C207 C614 R119 R120 R121 R204 R207
0-10 K 0.027u 1000p 0.022u NO 0 0 0 18k 750k
0-21 M2 0.027u 1000p 0.022u NO NO NO NO 18k 750k
TM-271A 144-148MHz
0-22 M3 0.027u 1000p 0.022u NO 0 NO NO 18k 750k
0-23 M4 0.027u 1000p 0.022u NO 0 0 NO 18k 750k
TM-271E 144-146MHz 2-71 E 0.047u 680p 0.039u 3p 0 NO 0 10k 1M