Kenwood TM-271A Service Manual page 39

K
TM-271A/271E
)
TX-RX UNIT (X57-685X-XX
F501
R:13.8V
T:13.45V
C526
680p
R522
FINAL AMP
330
Q504
RD70HVF1-01
C533
100p
Q503
PD55003TR
DRIVE AMP
T:1.6V T:1.45V
R520 R523
39k
18k
VOLTAGE
PROTECTION
PC/TV SW
Q354
2SK1830 T:4.97V
C391
C388
7p 16p
R:0.87V
R379 R532
TV PC
100k
PC/TV
MIC
W/NO(EVOL2)
VOLO(EVOL11)
BRI
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
DETECTION
D301
R:4.02V
MA742
C309
0.022u
R306
270k
NOISE AMP/
SQL AMP
R:1.74V Q301
2SC2412K
C306
R:1.15V
1000p
C258 R258
0.01u 2.7k
AUDIO
FILTER
IC251
BA10324AFV
R259 1
12k
2
3
4
VCC VEE
5
6
7
RX
R:3.37V
1/2Vcc
R:7.95V
R264
120k
8C
Q251
R:3.3V
2SC2412K
C264
0.033u
BUFFER
AMP
R265
R:2.7V
5.6k
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
INT(CPU18)
1/2Vcc
RESET(CPU10)
36
X57-685 3/3
L
SCHEMATIC DIAGRAM
ANT SW
L507 L508 C554 MA4PH633
1T 2.5T 1000p
T:1.46V
T:7.85V
T:2.5V
APC CONTROLLER
IC501
TA75W01FU
5 4
VEE
6 3
7 2
8 1
T:7.84V
VCC
R528
R531 R529 470
0 47k 470
R313
8TC
100k
VOLO(EVOL11)
SPM(CPU51)
AMPSW(CPU52)
C256
0.018u
R256
14 5.6k
13
8TC(CPU80)
12
11
10
8R
R251
9
DC SW (8R)
8
47k
KRC102S
8RC(CPU76)
C253
R253
0.22u 0
8C
5C
5M
LIMITTER
D251
MA742
R275
5C
15k
OVER VOLTAGE
DETECTION
FB
M
C623
3p
D602
C603 L602 L603 L604
1000p 5T 5T 5T
T:0.76V
D606,607
APC VOLTAGE
DETECT
D606 D607
MA742 MA742
D603,605
ANT SW
T:7.55V
D608
R605 R607
330
15k
1SS355
TEMPERATURE
COMPENSATION
MIC
BRI
C273 R277 R278
1u 68k 12k
Q254
R279
DTC363EU
4.7k
AF MUTE
Q35,36
8T
T:7.84V
D32
DC SW (8T) Q35
KTA1664(Y) CURRENT
R36 PROTECTION
Q36
R:13.66V
1.5k
KRC102S KEC
T:12.94V
R35
R37
47k
0 1812L110PR
R:7.9V
KEC
1,1A
VOLTAGE
REGULATOR
Q33,34 Q33
(8C)
2SA1745(6,7)
8R 8C
R34 IC31
Q34
KIA7808AF
R:7.9V
4.7k
R33 3 1
OUT IN
47k
COM
2
KEC
5C
IC32
NJM78L05UA
R:4.98V
1 3
OUT IN
COM
VOLTAGE
REGULATOR
2
(5C)
OVER VOLTAGE
DETECTION
D62
R63
R:4.31V
0
MA2S077
D61 R61
Q61
KRC404RTK
02DZ18(X,Y) 470
OVER VOLTAGE
KEC DETECTION
SBC(CPU82)
INT(CPU18)
RESET(CPU10)
N
R800
D1-4
SURGE ABSORPTION
5M
POWER
MIC
R1
PTT
R2
35
BRI
RXD
R3
34
POWER
17
VOL
R4
89
8C
8C
5C
5C
DO
70
CL
68
CE
69
DI
71
MICKEY
R5
88
ENCB
R6
73
CM
R7
87
ENCA
R8
74
AUDIO AMP
IC252
LA4600
10 9 8 7 6 5 4 3 2 1
C274
0.22u
Q255
KRC102S
AF MUTE
KEC
DC SW (SB)
1000p
C37
R:13.8V
D32
Q31
F1
2SA1641(S,T)
SB
DC SW (SB)
D31
Q32
KRC102S
REVERSE
CONNECTION
KEC
PROTECTION
VOLTAGE
REGULATOR
(5M)
IC33
NJM78L05UA
R:4.98V
5M 1 3
OUT IN
COM
2
IC34
IC35
BD4732G
BD4740G
1 1
5
NC VCC NC VCC
2
2
SUB SUB
3 3
4
GND
GND VOUT VOUT
VOLTAGE VOLTAGE
DETECTOR
DETECTOR
(INT)
(RESET)
O
CN1
18
0
17
16
100 15
14
100 13
12
11
1k
10
9
8
7
6
5
4
1k
1k 3
2
1k
1k 1
J1
CN5
B
E
5
R:4.98V
4