Kenwood KR-V8090 Service Manual page 23

A B
(X05-4670-20) : 1060VR(Y)/1070VR(Y)/KR-V8090(C) TYPE
The DC voltage is an actual reading measured with a high impedance type
voltmeter 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
instruments used or on the product. The value shown in ( ) is actual reading
1
measured in the AM mode.
MODE CARRIER
FREQUENCY
FM 98MHz
AM 1000(999)kHz 400Hz
A1 (W02-2582-05)
D1
2
D2
RF AMP
J1
1 ANT1 C2
FM
Ω
75
10P
FM GND
Ω GND
300 2
GND
3
AM ANT
J2
4 GND
3
FET : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-3 : HVU202 or
1T362
VT VOLTAGE
BAND FREQ. VT
1.6V
LF
FM
HF 7.6V
LF 1.4V
AM
4
HF 5.2V
LF: LOWEST FREQUENCY
HF: HIGHEST FREQUENCY
5
IC1 : LA1832
IC2 : LC72131
IC4 : NJM4565M
Q1 : 2SC2714(R,O)
Q3,6 : 2SA1576A(R,S) or 2SA1586(Y,GR) or
2SB1218A(Q,R)
6
Q5,9,10 : 2SC4081(R,S) or 2SC4116(Y,GR) or
2SD1819A(Q,R)
Q7,8 : 2SD1757K or 2SD2114K
D1,2,8 : 1SS133 or
HSS104
D3,4 : RD5.1ES(B2) or HZS5.1N(B2) or
MTZJ5.1(B) or UZ-5.1BSB
D10 : MA111
D12 : RD3.3ES(B2) or HZS3.3N(B2) or
MTZJ3.3(B) or UZ-3.3BSB
D13 : RD2.7ES(B2) or HZS2.7N(B2) or
MTZJ2.7(B) or UZ-2.7BSB
7
C D
MODULATION
ANT INPUT
DEVIATION
1kHz STEREO 67.5kHz 7.5kHz(Pilot) 60dB
MONO 30% MOD 60dB
FM FRONT END
MIX DISTORTION(ST)
VT
IFT
TR1
R2 C4
0-100 3P
FET
R14
68 VCC
R11
100K-
TR2
OSC
680K
C13
OSC
8P BUFFER
C14
TR3
27P
IF-OUT
OSC
R24 R25
5.6K 100
VT
1/4W
+ +
+
5.1V
C28 R27 10K
2.6V
0.022 1.0V
IC2
PLL
1.0V
REFERENCE PHASE DETECTOR
DIVIDER CHARGE PUMP
1 SWALLOW COUNTER
2 1/16, 1/17 4bit
12bit
PROGRAMMABLE
DIVIDER
C2B I/F DATA SHIFT REGISTER LATCH
0V
(9.0V)
4.3V
X1
7.2MHz
2.6V
ST: 4.3V
MONO: 0V
R20 1K
2
R23 1K
4
R22 1K
C38 5
470P R21 1K
3
E F
L1
C65
4P
FM:6.6V
R43 R45 C8
5
220 10K 0.01
+
C26
6 47u16
10.5V
R6
FM IF
AMP 100
1.8V 9.5V
R44 Q1 CF2
7 100 CF1
1.0V
8
+11V
11.0V
+11V +11V
0V
0V
11.0V (0V)
FM+B
0V
(2.6V)
Q3
2.6V +11V
(0V)
R32
UNLOCK
DETECTOR
1.2K
UNIVERSAL
D13
COUNTER
+11V
SIGNAL LINE
GND LINE
+B
+B LINE CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list).
-B -B LINE
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 carried out (exposed parts are acceptably insulated from the supply circuit)
before the appliance is returned to the customer.
G H
+ +
2.3V
5.1V
2.3V 2.0V 0V 2.6V
(2.1V)
R40
(2.1V) (2.1V) (2.9V) (2.1V)
1K 3.7V
AM
AM AM
ALC
OSC MIX RF.AMP
BUFF
AGC
AM AM
IF DET
LEVEL
DET AM/
S-CURVE
FM
IF
COMP
FM
BUFF
IF FM
DET
TUNING
DRIVE
AM
FM
3.1V
REG GND
2.2V
(3.7V)
2.2V 0V
IC1
5.1V
ST: 0V AM/FM/
MONO
MPX
:4.8V
SYSTEM
AM IFT
+
L2
+15V
I J
1.4V
1.4V
2.1V
2.4V
(0.3V)
4.1V
DECODER
UNTIBIRDIE
MUTE
STEREO
SW
STEREO
TRIG
DRIVE
FF FF FF
PILOT
VCO
DET
AM/
FM
SW
PHASE DET
VCC
0.5V
3.9V C12 R18 4.0V
(1.4V) 2.2u50 3K
(0V)
C11 1u50
Q5 0V
(0.6V)
ON:FM
OFF:AM
C23 1u50
+
5.1V
indicates