Kenwood RXD-251 Service Manual page 21

A B C
TUNER UNIT RXD-351(J,X1,Y1,M1), RXD-A3(K1,P1), RXD-251(X2,M3), RXD-371S(M2)
1 RF AMP
FM ANT
IC101
COIL
JK101 L101
C155 C101
100P 1 5 1000P
FM
1
75 OHM
2
3 4
GND 2
FM IFT
C119
GND 3
L102
1000P
AM
1 6
4 6
(MW/SW)
D106
(2/2)
2 5
5
3 4
4
2
FM RF
COIL
D106
(1/2)
R110
TP2
33K 1 2
R145
1K
3
FRE- VT
BAND
J QUENCY VOLTAGE
LF 1.2V
FM
HF 7.0V
LF 1.1V
AM
HF 7.3V
L104
1 6
5
2
R114 C116 L105
3 4 100K 470P 1
2
AM ANT 3
4 COIL
MW OSC
D108
F COIL
AM ANT
COIL
L104
Q110
1 6
2 5
D108 D108
3 4
(2/2) (1/2)
5
R153
C169 1K
0.022 1/4W
Q114
R162
4.7K
Q203
SW ANT
COIL
L201
C201 4 5
560P
2
3 1
Q100
R100
4.7K
6
Q113
E
7
D E F
+12V
4.5V(5.0V)
3.8V
R118
CF102
4.1V R105 100
1K
+B
0.7V
R104
CF101
100
+
IF
T101 Q101
AMP
1
0.1V
2
3
5.0V
5.0V (5.6V)
(0V)
R112 R213
Q105
R102 100 10K
+B +B +5V
1K 1/4W
C110 R109
1.3V
100K
2.4V
(5.5V)
L103
C112
100P
FM OSC
Q102
COIL
0.7V
11.5V
R132 R131
10K 1K R130
+
R133 C143
+
2.2K
C144
0.01
Q107,108
1.0V
Q107 R214
L.P.F
6.8K
JUMPER
Q108
A
R151
0.6V
470
JUMPER
Q106
C116 AM RF
10P
AMP
B
6
5
1.0V
4
+B +B
R138
4.7K
+5V +5V +5V
MW OSC
COIL
L105
C167 R157
Q111
470P 10
1 6
2 5
3 4
2.1V
R158
IC201 PLL
4.7K
Q112
SW OSC
COIL
L202 R204
Q202
1 6 10
2 5
3 4
Q204
R205
4.7K +
Q201
2.0V
D
G H I
+12V +12V
+B
+
C121
AM IFT
T102 15P 11.5V
3 6
2 5
CF103
1 4
AM/FM
+ C123
+B 1u50 /MPX
+ SYSTEM
IC
ST: 0V
MONO: 4.7V
IC102
TUNED: 0V
+
VCC
REG GND
FM
AM
PHASE DET
TUNING
AM/
DRIVE
FM
FM
FM DET SW
IF AM/ PILOT
COMP
VCO
FM DET
IF
S-CURVE
LEVEL BUFF
FF FF FF
DET
AM AM
DET STEREO TRIG
IF
DRIVE
STEREO
AGC
SW
BUFF
MUTE
AM
AM AM
ALC
OSC MIX RF.AGC
DECODER
0V
4.3V
2.1V
(5.0V)
R122
C151
3.3K
+ 1500P
2.9V
(3.7V)
L107 C161 R127
47mH
+ 1u50 3.3K
+
+
C152
1500P
R121
TP1
3.3K C162 R126
C128 L108
2 IF 1u50 3.3K
0.022
+
1 GND 47mH
C
5.0V
R140
3.6K
ST: 3.2V
+5V
MONO: 0V
+
G
Q110 Q111
H
REFERENCE PHASE DETECTOR Q116 Q115
DIVIDER CHARGE PUMP
1 SWALLOW COUNTER
2 1/16, 1/17 4bit
12bit
PROGRAMMABLE
DIVIDER
UNIVERSAL
SHIFT REGISTER LATCH
COUNTER
C215
22u16
+
MUTE
ON: 0V
OFF: 2.3V
MUTE
Q109
ON: 4.5V
OFF: 0V
MUTE
CONTROL
J K L
CN101
10 MUTE
AUDIO
9 Lch -CN101
8 GND
4/5
7 Rch
6 ST IND
A
+12V 5 +12V
2 4 CE
3 3 DI
4 2 CLK
5 1 DO
RXD-301/351
DESTINATION A,D,E, B,C, D111, C100A,147, C130, C166,
G D110 C110 C116 C117 C143 C171
216,217
COUNTRY ABB. H,J F,I 112 221-223 131
JAPAN J
AUSTRALIA X1 NO
AUSTRALIA X3 NO YES MTZ5.6B YES YES 2.2P 470P 20P 0.015 1u50 NO 0.1
PX Y1
YES
GENERAL MARKET M1
RXD-A3
DESTINATION A,D,E, B,C, D111, C100A,147, C117 C130, C166,
D110 C110 C116 C143 C171
112 221-223 131 216,217
COUNTRY ABB. G,H,J F,I
U.S.A. K1
NO YES MTZ5.6B YES YES 2.2P 470P 20P 0.022 1u50 NO 0.1
CANADA P1
RXD-251
DESTINATION A,D,E, B,C,
D111, C100A,147, C130, C166,
G D110 C110 C116 C117 C143 C171
COUNTRY ABB. G,H,J F,I 112 221-223 131 216,217
AUSTRALIA X2 NO
NO YES MTZ5.6B YES YES 2.2P 470P 20P 0.015 1u50 NO
YES
GENERAL MARKET M3
RXD-371S
DESTINATION A,D,E, B,C, D111, C100A,147, C110 C130, C166,
D110 C116 C117 C143 C171
G,H,J F,I 112 221-223 131 216,217
COUNTRY ABB.
GENERAL MARKET M2 YES NO MTZ6.2B NO NO 4.7P 10P 5.6P 0.015 3.3u50 YES 0.022
IC101 : LA1186N
IC102 : LA1831
IC201 : LC7218
Q100,114 : 2SC2001(L)
Q101 : 2SC1675(L)
Q102 : 2SC1674(L)
Q105 : DTA114YS
Q106 : 2SK161(GR)
Q107,108 : 2SC945(Q)
Q109,115,116 : DTC114YS
Q110,111 :
Q112,202-204 : 2SC2878A
Q113,201 : DTA144ES
CAUTION: For continued safety, replace safety critical components only with manu-
D101,102,105,111,112,202
facturer's recommended parts (refer to parts list).
: 1SS133
nents. For continued protection against risk of fire, replace only with same type and
D106 : KV1340A
rating fuse(s). To reduce the risk of electric shock, leakage-current or resistance
D108 : KV1581A
D110 :
measurements shall be carried out (exposed parts are acceptably insulated from
the supply circuit) before the appliance is returned to the customer.
SIGNAL LINE
GND LINE
The DC voltage is an actual reading measured with a high impedance type volt-
+B +B LINE
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 mea-
sured in the AM mode.
MODE CARRIER
FM 98MHz
AM 1000(999)kHz
RXD-351(J,X1,Y1,M1) (1/5)
RXD-A3(K1,P1) (1/5)
RXD-251(X2,M3) (1/5)
RXD-371S(M2) (1/5)
M N O
C213, R150, Q110,
R115 R130 R134 R151 R161 R220 JUMPER
214 219 111
NO
150
24P 22 3.3K NO NO 2.2K YES YES
1/2W
DTC114YS
C213, R150, Q110,
R115 R130 R134 R151 R161 R220 JUMPER
214 219 111
150
24P 22 3.3K NO NO 2.2K YES NO YES
1/2W
C213, R150, Q110,
R115 R130 R134 R151 R161 R220 JUMPER
214 219 111
150
0.1 24P 22 3.3K NO NO 2.2K YES NO YES
1/2W
C213, R150, Q110,
R115 R130 R134 R151 R161 R220 JUMPER
214 219 111
100
27P 47 10 YES YES 4.7K NO 2SC2878A NO
1/2W
indicates safety critical compo-
MODULATION
ANT INPUT
FREQUENCY DEVIATION
1kHz STEREO 67.5kHz 7.5kHz(Pilot) 60dB
400Hz MONO 30% MOD 60dB
RXD-251/301/351/371S/A3
Y39-2930-11