Kenwood TM-281A Service Manual page 38

K
TM-281A
IC302
RA60H1317M231
POWER MODULE
T:7.67V
DRIVE AMP
Q303
RD00HVS1-T113
T:2.71V
R350
10
L308 L310 C332 R331
8.2n 47n
10
150p
C581
C578
VOLTAGE
PROTECTION
33p
39p
TV
PC/TV
MIC
W/NO(EVOL2)
VOLO(EVOL15)
BRI
8TC(CPU80)
8RC(CPU76)
SPM(CPU51)
AMPSW(CPU52)
DETECTION
D503
HSB88AS-E
C530
0.022u
R:3.20V
R:1.02V
C523
R:0.45V
5600p
Q502
2SC4617(S)
SQL AMP
C785 R797
0.01u 2.7k
OP AMP
IC709
BA10324AFV
R790 1 14
12k 2 13
FILOUT
12
3
11
4
VCC VEE
5 10
6 9
7 8
RX
R:3.34V
1/2Vcc
R:7.82V
R791
120k
8C
Q706
R:3.22V
2SC2412K
C789
0.033u
BUFFER
R:2.62V AMP
R795
5.6k
SQIN(CPU93)
DTMF IN(CPU95)
SBC(CPU82)
INT(CPU18)
1/2Vcc
RESET(CPU10)
38
X57-813 (A/2) 3/3
L
SCHEMATIC DIAGRAM
65W:4.29V
25W:3.43V
D306,307
ANT SWITCH
STRIP LINE
L317
1.5T
T:7.73V
APC CONTROLLER
IC303
NJM12904RB1
R334
100
1 8
VCC
7
2
3 6
4 5
VEE
PROTECTION
D305
DA2S101
R557
100k
PROTECTION
D504
DA2S101
R526 R535
0 0
VOLO(EVOL15)
SPM(CPU51)
AMPSW(CPU52)
C793
0.018u
R800
5.6k
R811
8TC(CPU80)
0
8R
R802 Q708,710
DC SWITCH (8R)
47k
Q708
RT1N141U-T111
8RC(CPU79)
C795
R801
0.22u 0
8C
R:5.00V
5C
LIMITER
5M
D711
1SS372F
R810
5C
15k
RT1N141U-T111
OVER VOLTAGE
DETECTION
FB
M
TX-RX UNIT (X57-8130-XX)(A/2): TX-RX SECTION
D306
L407CDB C413 C420
C405
2p
1000p 4p
D307
C406
L407CDB L319 L320
5T 5T
1000p
T:1.58V
D313,314
APC VOLTAGE
DETECT
D313
D314
HSB88AS-E
HSB88AS-E
D309,311
R560
ANT SWITCH
0
D316
PROTECTION
65W:1.25V
TEMPERATURE
25W:0.77V
COMPENSATION
D312
R348
15k
RB521S-30
CN501
MIC
BRI
C808 R818 R819
1u 68k 12k
AF MUTE
R815 Q712
DTC363EU
4.7k
AF MUTE
RT1N141U-T111
Q709,711 8T
T:7.72V
DC SWITCH (8T) Q711
2SB1694
R814
Q709
R:13.8V
1.5k
RT1N141U-T111
T:13.8V
R816
47k
R:7.79V
Q710
8V AVR
2SB1694
8R
8C
R812 IC711
TA7808F-NQ
2.2k
R813 2 1
OUT IN
47k GND
3
IC710
R:7.82V
5C XC6209B502P-G
5V AVR
PROTECTION
D710
R:4.56V
DA2S101
R:0V
D712 R809
Q707
UDZW18(B) 470
OVER VOLTAGE
DETECTION
SBC(CPU82)
INT(CPU18)
RESET(CPU10)
N
ANT
R380
D702,704-706
SURGE ABSORPTION
5M
POWER
8C
R703
RXD
100
R702
PTT
R704 1k 100
VOL
R705 1k
MICKEY
5C
R707
CM
1k
R708
ENCA
0
R706
ENCB
0
DI
DO
CE
R834
CL
1k
BRI
POWER
R701
0
AUDIO AMP
IC715
LA4600
10 9 8 7 6 5 4 3 2 1
C816
0.22u
Q715
DC SWITCH (SB)
C822 1000p
Q714
F701
2SJ645
SB 4A
DC SWITCH (SB)
Q713
RT1N141U-T111
REVERSE
CONNECTION
PROTECTION
5V AVR
IC713
TA7805F-NQ
R:4.94V
5M
1
2
OUT IN
GND
3
IC714
IC712
XC61CN4002MR XC61CN3202MR
3
3 1 1
VIN VOUT VIN VOUT
VSS VSS
R:5.98V
2 2
VOLTAGE
VOLTAGE
DETECTION
DETECTION
(INT)
(RESET)
O
ANT
0
CN702
SPGND
1
SPGND
2
SPOUT
3
SPOUT
4
8C
5
RXD
6
PTT
7
VOL
8
MICKEY
9
5C
10
CM
11
ENCA
12
ENCB
13
DI
14
DO
15
CE
16
CL
17
BRI
18
POWER
19
MIC
20
ME
21
GND
22
J701
EXT SP
R:13.8V
B
E
R:4.93V