Kenwood TK-890 Service Manual page 18

POWER AMP
* IC1
FINAL UNIT (X57-5620-XX) (C/3)
1 2 3 4
-10 : TK-890/890(B) K -11 : TK-890(B) K2 -12 : TK-890(B) K3
R2
CN1
CN203
33
DO
DO
+20dBm
R3
33
0V
(4.27V)
PROTECT OF VOLTAGE
D1
13.57V
PROTECT OF REVERSE (12.6V)
CONNECTION
CN2
+B
CN501
W1
1
3
+B
D2
2
+B
SURGE ABSORPTION
1
E
3
CN201
W2
1
PC 4
8T 3
8R
2
E 1
DB
5
X57-5620-XX(C/3) C11 C13 C16 C41 C42
-10 TK-890/890(B) K 10u35 NO 2p NO NO
-11 TK-890(B) K2 10u35 6p 7p NO NO
-12 TK-890(B) K3 NO NO 3p 47u25 0.01u
L1
RIPPLE
FILTER
Q801
2SC4116(Y)
R804
1k
CURRNT
STEERING
D802
R806
1.8k
1SS355
DC AMP
IC801
* C814
OP291GS
8 1 R808
oUTA
+V
7 2 100k
oUTB -INA
6 3
+INA
-INB
5 4
-V
+INB
0V
(4.9V)
VR1
100k
C814 C822 IC1
NO NO RA45H4452M-31
NO NO RA45H4452M-31
470p 1u16 RA45H4047M-31
ANT SW
D3
MA4PH633
8T 8T
COMBINER
D803
1SS355
X57-5620-XX(C/3)
-10 TK-890/890(B)
-11 TK-890(B)
-12 TK-890(B)
D5
FORWARD
D4
WAVE
ANT SW RECTIFICATION
C23 L4 L5
470p
D6
HSM88AS HSM88AS
FORWARD REFLECTED
WAVE WAVE
C817 C818
RECTIFICATION RECTIFICATION
100p 100p
R812
R810 R811
150k 220k 270k
R809
10k
DC AMP
IC802
OP291GS
R815
10k
C19 C24 C27 C28 C30 C37 C38 C816 R14 R817
K 4p 4p 5p 5p 5p 5p 5p NO 100 68k
K2 3p 4p 3p 5p 4p 5p 5p NO 100 100k
K3 5p 6p 7p 7p 6p 6p 7p 1200p 82 56k
CN3
CN104
RA
RA
CN4
L7
ANT
+46.02dBm
D7