Kenwood NX-820H Service Manual page 74

AJ
NX-820H(G)/820H
X57-824X-XX C12 C47 C49 C50 C51 C54 C59
0-10,0-11 NX-820H(G)/820H K 5p 3p 18p 270p 470p 5p 20p
0-12,0-13 NX-820H(G)/820H K2 7p 4p 10p 150p 270p 8p 24p
THP1
✽
C 47
R41
FIN
1 2 n
0
RX VCO Assist Tune
RX VCO
Frequency Control
✽
R 40 L6 C5 0
10u
0
R36
L4 0
0
TX VCO
Frequency Control
TX VCO Assist Tune
✽
L7 C51
R 35
10u
0
R34 L 4 1
0
VCO MOD
C 55
1u
B-BUS
150C
X F 1
L 71- 06 78 - 05
R39 4 L 312
4 1
150n
18 0
150C
SP-
SP+
MI C
M E
B-BUS
74
X57-824 8/10
AK
C61 C66 C67 C68 C72 C90 C208 C212 C214 C218 C220 C221 C222 C224
0.5p 6p 4p 3p 5p 7p 4p 8p 7p 6p 12p 4p 2p 13p
NO 7p 5p 6p 4p 10p 6p 12p 8p 5p 15p 8p 10p 15p
✽ ✽
L20 C 49 R46
R:3.92V
T:0.93V
RX VCO
✽
L 2 4
Q5
MCH3914(8)-H
✽
C 6 6
RX VCO
D7
1 SV 282 - F ✽ ✽
C 5 9 L1 8
D9,10
RX VCO
Assist Tune
✽
L2 1
TX VCO
Q6 C6 9
TX VCO
MCH3914(8)-H
6 p
✽
C 7 1 L 1 7
D 8 18 p
1 SV 28 2- F
FM Modulation
D11,12
TX VCO
Assist Tune
R 49
R5 2
6.3
47 k
4 7 0k
✽
T H 2
✽
R 90
100k
L1 9
50CS
R:4.71V
Speed up
T:4.73V
D 1 4
DA 2S 10 1
✽
R2 0 4
4.78V
4. 7 k
BPF
L315 L3 1 6 L 20 3 2 70 n
C 3 6 0
3 90 n 18 0 n
0. 01 u
R20 3
RX 1st Mixer
68 0
Q 2 0 1
3 SK3 1 8
AL
SCHEMATIC DIAGRAM
C225 C226 C230 C231 C232 L11 L13 L17 L18 L21 L23
8p 4p 8p 8p 5p 180n 180n L34-4607-15 L34-4608-15 180n 180n
4p 5p 10p 5p 9p 220n 220n L34-4608-15 L34-4609-15 220n 220n
R 5 8
1 0
R:1.26V
Q10,11
T:0.0V
Buffer AMP
C 7 4
0 . 5 p
Q 1 0
2 SC5 1 08 (Y)F
R:0.69V R 6 1 C8 1
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
0.5p
R:0.0V
T:1.15V
Q8,9
T/R VCO Switch
R:3.3V Q9
T:0.0V
SSM 3 J 1 5 F S
EM 6 M 1
4 3
5 2
6 1
Q8
R 5 6
0
R:4.02V
T:4.05V
Ripple Filter
Q4
2SC5383-T111
SideA
R 22 3 C2 0 6
L 2 0 4 ✽ L 2 0 5
1. 5 p
0
C 2 1 1 C 2 1 3
1 p 2 p
C2 1 6
4 7 0 p
150C
AM AN
L24 L204 L205 L206 L207 L208 L209 L211 L214 R46 R55 R57 R82 R85
180n 15n 15n 39n 27n 27n 27n 27n 18n 68 150 150 0 0
220n 18n 18n 47n 33n 33n 33n 33n 22n 33 180 180 NO NO NO NO
TX-RX UNIT (X57-8240-1X)
VCO
✽
R8 0 R 83 R 86
0 0
R8 1 R8 7
R8 4
0
0 0
✽ ✽
R8 2 R 8 5
R:4.41V
T:4.41V
Q1 1
C8 9
2 SC5 1 0 8(Y)F
C 84
6 p
R:1.04V
T:1.04V RKS 15 1 KJ
3 p
D16,17
T/R Switch
L 2 6
R: 1.47V
T: 0V
✽ ✽
✽
C2 2 1 C2 25 C 2 3 1
K K2
fL:3.76V 2.86V
fC:7.47V 6.66V
fH:10.66V 10.17V
R 2 3 0
R2 57
0
1 oUT1
1 0 0 k
VDD 8
2
- + 7
13.9V
3
+ - 6
4 VSS
5
C 23 9
0.1u
C 24 0
1 u
DC AMP(BPF)
IC 2 01
BD 75 4 2FV M
R86 R90 TH2
0 1M ERTJOEV104H
NO
THP1
D 1 7
B-BUS
D201-203,205
RX BPF Tune
S P-
S P +
M I C
ME
B-BUS