Kenwood KRF-V7020D Service Manual page 19

A B
TUNER UNIT (X05-498X-XX)
1
FM FRONT-END
A1 (W02-2622-05)
E1
2
RF AMP
J1
1 1 ANT1
R2
FM 75
0-100
C2
2
FET
10P
3
ANT2
GND 2
GND
4 3
AM ANT
4 GND
FET : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-3 : HVU202 or
3 1T362
VR-307 (X05-4980-10)
DESTINATION R15, R27, R72, C8,
UNIT No. R14 R23 R25 R29
A
82 28 73 77
COUNTRY ABB.
U.S.A. K6
0-10 NO 100 YES 4.7K 22K 6.2K NO 15K NO
CANADA P6
VR-309 (X05-4980-10)
DESTINATION
R15, R27, R72, C8,
UNIT No. A R14 R23 R25 R29
COUNTRY ABB. 82 28 73 77
4
U.S.A. K8
0-10 NO 100 YES 4.7K 22K 6.2K NO 15K NO
CANADA P8
VR-357 (X05-4980-10)
DESTINATION R15, R27, R72, C8,
UNIT No. R14 R23 R25 R29
A
82 28 73 77
COUNTRY ABB.
U.S.A. K7
0-10 NO 100 YES 4.7K 22K 6.2K NO 15K NO
CANADA P7
KRF-V7020D (X05-498X-XX) / (X05-5062-10)
DESTINATION R15, R27, R72,
UNIT No. R14 R23 R25 R29
A
82 28 73
COUNTRY ABB.
PX Y7
GENERAL MARKET M7 0-21 YES YES
CHINA C7 270 NO 3.3K 18K 7.5K 8.2K
AUSTRALIA X7 0-71 NO NO
SHANGHAI V7 62-10 YES YES
5
KRF-V8020D (X05-498X-XX)
DESTINATION R15, R27, R72,
UNIT No. R14 R23 R25 R29
A
82 28 73
COUNTRY ABB.
PX Y8
GENERAL MARKET M8
0-21 YES YES
CHINA C8 270 NO 3.3K 18K 7.5K 8.2K
MALAYSIA I8
AUSTRALIA X8 0-71 NO NO
IC1 : Q1,3,4 : 2SC4081(R,S) or D1 : DA204U or
IC2 : LC72131 2SD1819A(Q,R)
Q2,12,14 : 2SA1576A(R,S) or
2SB1218A(Q,R) D3 :
Q10,11 : 2SD1757K
D4 :
6 D5 :
D8,13 : MA111
D9 :
A1 :
The DC voltage is an actual reading measured with a high impedance type voltmeter as the AM/FM sig-
nal generator is specified to the conditions as shown in the list below. The measurement value may vary
7
depending on the measuring instruments used or on the product. The value shown in ( ) is actual
reading measured in the AM made.
C D
L2
1uH
C40 2P
D1
L9
10uH
L1
MIX DISTORTION(ST)
VT 5
IFT
TR1
C4 IF-OUT 7
3P
R14
68 +B 6
VCC +B
OSC
R11 C17 OUT 8
100K- 100P
TR2
OSC
680K
C13
TR3
8P
C14
OSC
27P
BUFFER
C30, C74,
CF1,2 CF3 IC1 L4,5 CN2 W56 S1
31 82
L72-0596
0.033 YES NO LA1837 YES YES NO NO
(MS2)
C30, C74,
CF1,2 CF3 IC1 L4,5 CN2 W56 S1
31 82
L72-0596
0.033 YES NO LA1837 YES YES NO NO
(MS2)
C30, C74,
CF1,2 CF3 IC1 L4,5 CN2 W56 S1
31 82
L72-0596
0.033 YES NO LA1837 YES YES NO NO
(MS2)
C30, C74, L4,
C8 C77 CF1,2 CF3 IC1 CN2 W56 S1
31 82 5
YES YES YES
L72-0531
YES 0.022 NO YES LA1838 NO NO
(MA5)
NO NO NO
YES YES YES
C30, C74, L4,
C8 C77 CF1,2 CF3 IC1 CN2 W56 S1
31 82 5
YES YES YES
L72-0531
YES 0.022 NO YES LA1838 NO NO
(MA5)
NO NO
NO
SIGNAL LINE
MA143A or
GND LINE
1SS302
+B B LINE
MTZJ8.2(B) or
B LINE
HZS8.2N(B2) B
MTZJ5.1(B) or
HZS5.1N(B2)
MTZJ2.7(B) or
HZS2.7N(B2)
MTZJ3.3(B) or
HZS3.3N(B2)
MODE
FM
AM
E F
CN2
1 2
FM TUNING
+
LEVEL
+
R23
C24
330P
R42
+
R41 10K
100K
REG
AM AM AM
ALC
OSC MIX RF.AMP
BUFF
AGC
AM IF DET
SD
COMP
AM
S-METER
FM AM/FM
S-CURVE
S-METER IF-BUFF
TUNING STEREO
DRIVE DRIVE
FM
FM IF
DET
GND
L3
C81
1
+
+B
R43
220
IF AMP
+B
6.6V
C5
0.01 R11
33
6.0V
Q2
1.6V
R1 C88 C1
100 3300P CF1 0.022
C84
0.022 CF2
Q1
1.0V
1.2V
+
+
R44
+B
270
1/4W
R51
5.6K +
+
+
2.5V
0.9V
1/2
REFERENCE PHASE DETECTOR
DIVIDER CHARGE PUMP
SWALLOW COUNTER
1/16,1/17 4bits
POWER
UNLOCK
ON
DETECTOR
RESET
2
C B I/F DATA SHIFT REGISTER LATCH UNIVERSAL COUNTER
X1
7.2MHz
C44
470P
MODULATION
CARRIER
FREQUENCY DEVIATION
98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot)
1000(999)kHz 400Hz MONO 30% MOD
G H
C33
0.01
0V
R25 C26
+ +
0.022 FM/AM/MPX
C37 R33
SYSTEM IC 10u16 1K
C34
+
IC1 0.01
4.4V C38
2.8V
(4.4V) 10u16
(2.8V) 0V
+
A
DECODER
50uS
ANTI-BIRDIE
[75uS]
P-DET
STEREO
SW
MUTE
VCO FF FF FF PILOT
304KHz 38K 19K 2 19K 8 DET
VCC
7.0V
(4.0V)
4.3V
(0V)
C17
+
1u50
+ +
8.8V
(9.2V) +
+B
C89
L4 L5
4700P
C90
+
4700P
DISCRIMINATOR
R81
150
+B +15V
1W
R84
1K
MUTING
0V
Q10
+B
0V
+B
PLL
3.4V 3.5V
Q12
IC2
10.9V MUTING
2.8V
DRIVE
FM +B
SW
Q14
+B
12bits PROGRAMABLE
DIVIDER C77
11.0V 100P
R59
S1
10.3V 1.2K
FM :100kHz 75uS
AM :10kHz
C86
470P
FM :50kHz 50uS
AM :9kHz
CH.SPACE
DE-EMPHASIS
R48 1K
6
R47 1K
5
R46 1K
4
R45 1K
3
KRF-V7020D/V8020D/VR-307/309/357
ANT INPUT
60dB
Y05-3760-10
60dB
I J
Q3
R31
47K
0V
0V
[0.6V]
R30
560
Q4
EMPHASIS
75uS: ON
50uS: OFF CAUTION: For continued
safety, replace safety criti-
cal components only with
manufacturer's recom-
mended parts (refer to
parts list). indicates safe-
ty 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 resis-
tance measurements shall
be carried out (exposed
parts are acceptably insu-
lated from the supply cir-
cuit) before the appliance is
returned to the customer.
CN1
15 DET
R79 3.3K
14 S-LEVEL
13 SD
12 STEREO
11 R
X09-A/3
-2.2V -CN9
C83
10 GND
100P
0V
3/4
9 L
Q11
R74 +15V 8 +15V A
47K
15V 7 -15V
-2.2V
0V
R76
1.8K
R77
1K
6 T. MUTE
4 5 PLL DT
5 4 PLL CLK
3 3 PLL CE
R29 6 2 PLL DO
100
1 CH.SPACE
W56
VR-307 (1/4)
VR-309 (1/4)
VR-357 (1/4)
KRF-V7020D (1/4)
KRF-V8020D (1/4)