Kenwood NX-820 Service Manual page 112

AJ
NX-820
THP1
C47
R41 L2 0
FIN
1 2 n
0
RX VCO Assist Tune
RX VCO
Frequency Control
L 6 C 5 0
R40
10u
150 p
0
R36
L40
0
TX VCO
Frequency Control
TX VCO Assist Tune
C51
R 35 L7
10u
0
270 p
R34 L 41
0
.
VCO MOD
C55
1u
B-BUS
150C
XF1
L7 1- 06 78 -0 5
R3 94 L 3 1 2
4 1
150n
18 0
150C
SP-
SP+
M I C
ME
B-BUS
112
X57-824 8/10
AK
SCHEMATIC DIAGRAM / 原理图
4p
C49
R 46
3 3
1 0p
R:3.92V
T:0.93V
RX VCO
L 24
Q5
22 0 n
MCH3914(8)-H
C6 6
RX VCO
D 7
1S V 282- F 7p
C 5 9 L 1 8
8 T
2 4 p
D9,10
RX VCO
Assist Tune
L 2 1
TX VCO 22 0 n
Q6
C6 9
TX VCO
MCH3914(8)-H
6 p
C71 L 17
7T
D 8 1 8 p
1S V 282- F
FM Modulation
D11,12
TX VCO
Assist Tune
.
R4 9
R 5 2
6.3 47 k
47 0k
L 19
50CS
R:4.71V
Speed up
T:4.73V
D1 4
D A2 S1 01
R2 04
4.78V
4 . 7k
BPF
L315 L 31 6 L 20 3 27 0 n
C3 6 0
390 n 1 80 n
0. 01 u
R20 3
RX 1st Mixer
68 0
Q2 01
3S K3 18
AL
R5 8
1 0
R:1.26V
Q10,11
T:0.0V
Buffer AMP
C 7 4
0 . 5 p
Q1 0
2 SC 51 0 8(Y )F
R:0.69V R6 1 C 81
T:0.69V
1 50 k
7 p
R:0.0V
R:3.71V
T:3.9V
T:3.71V
R 5 0
1 0
C 7 6
0 . 5 p
R:0.0V
T:1.15V
Q8,9
T/R VCO Switch
R:3.3V Q9
T:0.0V
SSM 3 J1 5 F S
EM 6 M 1
4 3
5 2
6 1
Q8
R5 6
0
R:4.02V
T:4.05V
Ripple Filter
Q 4
2SC5383-T111
. .
SideA
R2 2 3 C 2 0 6
L 2 0 4 L 2 0 5
1.5p
0
1 8 n
1 8 n
C2 1 1 C 2 1 3
1 p 2 p
C2 1 6
4 7 0 p
150C
AM
TX-RX UNIT (X57-8240-13)
VCO
. .
R8 0 R 8 3
. .
.
0 0
R 8 1 R8 7
R 8 4
0
0 0
R:4.41V
T:4.41V
Q1 1
C 8 9
2S C5 10 8 (Y)F
C8 4
6p
R:1.04V
T:1.04V RKS 15 1 KJ
3 p
T/R Switch
L 26
R: 1.47V
T: 0V
. . .
C2 21 C2 2 5 C2 3 1
8p 4p 5 p
fL : 2.86V
fC : 6.66V
fH : 10.17V
.
R2 3 0 .
R 2 5 7
0
1 oUT1
10 0 k
VDD 8
2
- + 7
13.9V
3
+ - 6
4 VSS
5
.
C 2 3 9
.
0.1u
C2 4 0
1 u
.
DC AMP(BPF)
I C2 01
BD 75 4 2FV M
AN
THP1
D 17
D16,17
B-BUS
D201-203,205
RX BPF Tune
S P-
S P +
M IC
M E
B-BUS