Kenwood NX-220 Service Manual page 103

AJ
TX-RX UNIT (X57-8040-10)
/T_R
50CS
Fin
+B
7.49V R428 L405 C440
0 1.8u
100p
RX VCO TUNE
C441 R431
R429 L404
3.3u
0 100p
TX VCO TUNE
R425
0
50CS
CPout
CV
R417 R419
0 390
BYPASS
APC
OSC
50T
50R
33A
5
F 2
1A
+B2
F53-0319-15
50V SW CONT
D902
D901
REVERSE
CURRENT
PROTECT
DAN222
TXD0
D901
50CS PTT/RXD
MICI
1SS416
OPTDET
PTT2
EXTMICSW
Q906
RT1N141U-T111
EXT/MIC SW
R:7.49V
T:7.32V
C903
R901
SPAF
10k 1u
RT1N141U-T111
Q901
AFSW
R:3.29V
T:0V
6
AK
SCHEMATIC DIAGRAM /
D402,405,409
RX VCO MCH3914(7)-H
ASSIST TUNE
Q401
R430 D409
C446
0
33p
1SV325F
R:1.13V
T:0V
TX VCO
D407 C447
0
1SV325F
68p
D407,411,415
TX MOD
ASSIST TUNE
R441
470k
Q403
2SC5383-T111
SPEED
R:4.92V
UP
T:4.92V
A VR (50V)
DC SW
IC901
(AF PA AMP)
1 NC1
Q902
PoUT
10
2SA1362-F(GR)
2 VCC
PW - GND
9
3 NC2
PRE-GND
8
R:7.45V
4 VI N
T:0.27V
PHASE
7
5 RIP PL E
NF
6
TA73 68F G
AF POWER AMP
C906
0.1u
DC SW(AF MUTE)
AL
R446
22
R:4.14V
T:0V
C466
0.5p
R434
1 .8k
Q402
R447
MCH3914(7)-H
22
R:0V
T:4.14V
R:0.14V
T:0.64V
C467
0.5p
R:0V
T:0.94V
R:0V
T:4.25V
Q406
R:4.24V
SSM 6L0 5F U - F
T:0V
T/R VCO SW
R448
R:3.31V
470k
T:0V
R:4.26V
T:4.26V
RIPPLE FIL
50V
Q907
LEVEL CONV
U P A 672T - A
Q904,905
R905
AF POWER MUTE
470k
Q9 04 Q905
2SK3577-A
2SK3577-A
C908
100p
DC SW(AF MUTE)
Q903
RT1N441U-T111
AM
NX-220
原理图
R453
D416,417
R:4.80V 56
FIN FILTER TUNE T:4.80V
C457
C471
10p
10p
Q404
2SC5636
BUFFER
AMP
R:4.00V
T:4.00V
C473 C475
R 451
220k
12p
Q405
2SC5108(Y)F
BUFFER AMP
T/R VCO SW
Q407
SSM3J05FU-F
BUFFER AMP
Q408
2SC5636
C477
C482
R:1.18V
10p
T:0.89V
R:1.16V
T:1.17V
R912 680
PTT/RXD
MICI
MICO
R911
OPTDET
50V
27k
AE
R913
TXD
SPI
C914
100
SPO
100u
6.3
CN4
R917 0 1
R918 0
2
L902
3
4
L903
X57-804 6/8, X54-376 (C/3) 1/1
AN
+B
50CS
R:2.44V
T:2.66V
R:1.98V
T:1.91V
3p
C480
0.1u
C481
1000p
R:4.82V
T:4.86V
10u
/T_R
OSC
50T
50R
33A
5
APC
J 1
E XT
MIC
J2
E X T
SP
MIC SECTION
(X54-3760-XX)
(C/3)
MIC1
T91-0673-05
A
I N T
SP
103