Kenwood KRF-V7773D Service Manual page 25

F G
(X05-51XX-XX)
CN2
1 2
FM TUNED
+
ADJ
+
R23
C24
330P
+
REG
AM
AM AM
ALC
OSC MIX RF.AMP
BUFF
AGC
AM IF DET
SD
COMP
AM
S-METER
FM AM/FM
S-CURVE
IF-BUFF
S-METER
TUNING
DRIVE
FM
FM IF
DET
GND
L3
C81
1
+
+B
R43
220
9.8V
3.8V FM IF AMP
(FM98MHz)
+B
6.8V
C5
0.01 R11
6.2V
Q2
1.8V
R1 C88 A C1
100 3300P CF1 3300P
C84
3300P CF2
Q1
ATT 1.1V
1.3V
+
+
+B
FM: 6.4V
AM: 0V
5.2V
R51
5.6K
+
+
+
2.8V
1.1V
1/2
REFERENCE PHASE DETECTOR
CHARGE PUMP
DIVIDER
SWALLOW COUNTER
1/16,1/17 4bits
POWER
UNLOCK
ON
DETECTOR
RESET
2
C B I/F DATA SHIFT REGISTER LATCH UNIVERSAL COUNTER
0.6V
0V
(11.3V)
X1
7.2MHz
C44
470P
H I
R25 C26
+ +
0.018 FM/AM/MPX
C37 R33
SYSTEM IC 10u50 1K
+
IC1
C38
4.3V 10u50
2.9V
+
DECODER
ANTI-BIRDIE
P-DET STEREO
SW
MUTE
VCO FF FF FF PILOT
304KHz 38K 19K 2 19K 8 DET
STEREO
DRIVE
VCC
7.0V
(3.9V)
+
8.8V
(9.2V) +
+ +
+B
8.2V
+
R15
33K
L4 L5
DISCRIMINATOR 14.3V
R81
150 1W
+B
R84
3.3K
R44
+B
270
1/4W
+B
PLL
IC2
10.6V
FM +B
12bits PROGRAMABLE CONT.
DIVIDER
Q14 D5
+12V
10.8V
10.0V
R59
1.2K
R58 12K
R48 1K
6
R47 3.3K
5
R46 3.3K
4
R45 3.3K
3
J K
IC1 : LA1837
3.5V (3.0V)
IC2 : LC72131
Q1,3,4,6,7 : 2SC4081(R,S) or
2SC4116(Y,GR)
Q2,12,14
C : 2SA1576A(R,S) or
C33 Q3 R31
47K 2SA1586(Y,GR)
0.01
Q10,11 : 2SD1757K
0V
0V
0V
[0.6V] D1 : DA204U or
1SS302 or
R30 Q7
MA143A
C34 560
0.01
BUFFER D3 : RD8.2ES(B2) or
Q4
MTZJ8.2(B)
0V
D4 : RD5.1ES(B2) or
DE-EMPHASIS
75uS: ON MTZJ5.1(B)
50uS: OFF
D5 : RD2.7ES(B2) or
B
MTZJ2.7(B)
D8,11,13 : MA111
D9 : RD3.3ES(B2) or
MTZJ3.3(B)
+B
B
CHANNEL FREQUENCY (MHz)
CHANNEL 1
BUFFER OSC FREQUENCY 417.3
(S METER)
VT VOLTAGE
R38 Q6
1K CHANNEL 1
VT VOLTAGE 2.40 0.5
+
R39
10K
F
+B
R79 3.3K
W82
L6
MUTING
C70
-2.2V
8200P
Q10
W83
L7
Q11 R74 +14.3V
47K
C71
17.6V
8200P
R78
-2.2V 820
3.4V
R76
Q12
1.8K
MUTING
CONT.
5.0V R77
1K
+14.3V +14.3V 4
14.3V
5
3
C77 R29 6
100P 1K
S1
FM :100kHz 75uS
AM :10kHz
W56
FM :50kHz 50uS
AM :9kHz
CH.SPACE
DE-EMPHASIS
KRF-V7773D,V7773D-B/V9993D (1/6)
L M
CAUTION: For continued safety, replace safety critical components only with manufac-
turer's recommended parts (refer to parts list).
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.
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 measured in the AM mode.
MODULATION
MODE CARRIER
FREQUENCY
FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot)
AM 1000(999)kHz 400Hz MONO 30% MOD
SIGNAL LINE
GND LINE
B LINE
B LINE
2 3
414.3 411.3
2 3
2.35 0.5 2.30 0.5
CN1
15 DET
14 S-LEVEL
13 SD
12 STEREO
11 R
X13-A/5
-WH1
10 GND
3/6
9 L
8 +17V
A
7 -17V
6 T. MUTE
5 PLL DT
4 PLL CLK
3 PLL CE
2 PLL DO
1 CH.SPACE
KRF-V7773D/V7773D-B/V9993D
Y05-4090-21
N O
indicates safety critical components.
ANT INPUT
DEVIATION
60dB
60dB