Kenwood RXD-302 Service Manual page 12

A B
TUNER UNIT
1
FE101
JK101
J101
8
2
7
C158
G
0.01
6
3
T103
Q105
1 6
3 4
AM ANT COIL
4
5
+B
6
The DC voltage is an actual reading measured with a high impedance type volt-
meter as the AM/FM signal generator is specified to the conditions as shown in the
list below. The measurement value may vary depending on the measuring instru-
ments used or on the product. The value shown in ( ) is actual reading measured
in the AM mode.
MODULATION
MODE CARRIER
FREQUENCY DEVIATION
FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot)
7
AM 1000(999)kHz 400Hz MONO 30% MOD
C D
R101 CF101
22 10.7MS
1
2
R102
L102
68
22uH
1/2W
5
+B
+
3
L101
(5.1V)
22uH
L107
C159
22uH
0.022
R137
1K
FM98MHz:3.4V
MW999KHz:4.4V
TP1
MW OSC COIL
0V
D105
T104
C162
470P
1 6
5.0V
3 4 J104
5.0V
IC102 : LA1833L
SIGNAL LINE
IC103 : LC72131D
B LINE
Q101 : 2SC1675(L)
Q102 : 2SJ460T
Q105 : 2SK544F-T
D101,102,104,
107,108 : 1SS133
D103 : MTZJ5.6B
D105 : SVC3485-TL
ANT INPUT
60dB
60dB
E F
+B
+
4.3V(5.1V)
R103
1K
+
IF AMP
1.0V
R107
Q101
CF102 100
0.3V
2.1V
IC102
(BOTTOM VIEW)
+B AM/FM/MPX
SYSTEM IC
Q102
+B +B
R108
10K
2.7V(3.5V)
R110
8.2K
SFR101
20K
R124
3.3K
R127 R126
10K 1K
+
+B
R128 C149
5.6K 0.22 +B
0.9V
C148
0.01
5.1V
R130
220
FM98M:3.3V
MW999KHz:4.3V
C145
0.9V
27P
2.4V
0V 0V
C146
27P
2.3V
CAUTION: For continued safety, replace safety critical components only with manufactur-
er's recommended parts (refer to parts list). indicates safety critical components. For
continued protection against risk of fire, replace only with same type and rating fuse(s). To
reduce the risk of electric shock, leakage-current or resistance measurements shall be car-
ried out (exposed parts are acceptably insulated from the supply circuit) before the appli-
ance is returned to the customer.
G H
4.3V(5.1V)
+B
1 2 3
T102
R114
AM IFT 100
1/4W
4 6
1
CF103
3
2 ST IND.ON:0V
CF104
10.7MG46-A
4 +
6
0V
5 2.6V(3.6V) 0V 2.8V(0V)
2.1V 2.1V
2.1V(2.3V)
1.8V
2.1V
2.1V
2.9V(0.9V)
2.1V
R123
0V(2.1V)
3.3K
+
C135 R151
+
0.1 6.8K
C137 R122
C152 0.047 47K
0.022
+
R121 C134
18K 10u25
+
2 TP2
4.3V(5.0V)
IF
GND
1
R118
3.9K
C128
1500P
+B +B
+
0V
(2.7V)
+
C153
2.5V
1000P
(0V)
2.4V
IC103
4.7V
PLL
0V FM:2.8V 0V
MW/SW:0V
ST:3.2V
MONO:0V
FM:0V
MW/SW:6.0V
RXD-302/A31
Y39-3250-11
I J
C119
1u50
+
ST:3.2V
1.8V
+
MUTE
ON:4.6V
OFF:0V
CN101
R113
10K
10 MUTE
9 Lch
8 GND
7 Rch MAIN
-CN101
6 ST IND
3/4
+B 5 +12V A
10.9V
3 4 CE
4 3 DI
5 2 CLK
1 DO
R119
1K
1/4W
RXD-A31(1/4)