Kenwood TK-890 Service Manual page 21

FINAL UNIT (X45-3570-10) :TK-890H(B) K
R22
82k
TX DRIVE AMP
IC1
RA45H4452M-31
CN1
1
2 3
4
CN203 DO R14 C15
DO
+20dBm
33 100p
R16 0V
(3.52V)
33
R25
82k
CN201
5
W5
DB
1
E
2
3
8R
4
5
8T
PC
1
PROTECT OF VOLTAGE
D904
1SS355
CURRENT
STEERING
DC SW
R2
Q2
100k
2SC2712(Y)
DC SW
Q1
2SC2712(Y) R3
470
0V
(2.25V)
R24
6.8k
1/2(W)
Q6
RD60HUF1-01
CN5
Q6,7
FINAL AMP
CN6 Q7
RD60HUF1-01
R27
6.8k
1/2(W)
0V
(2.25V)
RIPPLE FILTER
Q901
2SC4116(Y)
R902 R904
0V
1k
1k
(7.96V)
CORRECTION
FOR
TEMPERATURE
D902
R906
1.8k 1SS355
DC AMP
IC901
OP291GS
1 8
oUTA +V
2 7
-INA oUTB
3 6
+INA
-INB
4 5
-V +INB
0V
(2.1V)
VR1
100k
B B
8R 8R
7.92V
(0V)
R909
10k
8T 8T
COMBINER
D903
R915
10k
1SS355
W2
REFLECTED
WAVE
RECTIFICATION
D2
HSM88AS
D1
HSM88AS
FORWARD
WAVE
RECTIFICATION
TX/RX SW
R12
Q8
W1 1.2k
FMC2
R910 R911 R912
0V
15k 39k 27k
(0.60V)
DC AMP
IC902
OP291GS
0V
(0.50V)
R916
150k
C916
R917 R918
470p 56k 10k
+48.75 - +50dBm
L5
L6 L7 R21
ANT
0
CN2
K1
RA CN104
S51-1437-05
RA
SURGE ABSORPTION
D4
1SS193
9.5V
(0V)
TX/RX SW
Q9
2SD1624(S)
D5
02CZ10(X,Y)
VOLTAGE
REFERENCE
13.4V
(12.50V)
DC 13.4V
+B
CN3
CN4
E
D6
SURGE
ABSORPTION
D7
PROTECT OF REVERSE
CONNECTION
CN501
W4
1
3
+B
2
+B
1
E
3