Kenwood KRF-X7775D Service Manual page 25

F G
TUNER UNIT (X05-51XX-XX)
CN2
1 2
FM TUNED
+
ADJ +
R23
+
REG
AM AM AM
ALC
OSC MIX RF.AMP
BUFF
AGC
AM IF DET
SD
COMP
AM
S-METER
AM/FM
FM
S-CURVE
S-METER IF-BUFF
TUNING
DRIVE
FM
FM IF
DET
GND
L3
C81
1
+
+B
R43
220
10.0V
4.1V 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
Q1 3300P CF2
ATT 1.1V
1.3V
+
+
+B
FM: 6.8V
AM: 0V
R51
5.6K
+
+
+
2.8V
1.1V
1/2
PHASE DETECTOR
REFERENCE
DIVIDER CHARGE PUMP
SWALLOW COUNTER
1/16,1/17 4bits
UNLOCK POWER
ON
DETECTOR
RESET
2
C B I/F DATA SHIFT REGISTER LATCH UNIVERSAL COUNTER
0V
(11.3V)
X1
7.2MHz
C44
470P
H I
C24
330P R25 C26
+ +
0.018 FM/AM/MPX
C37 R33
10u50 1K
SYSTEM IC
+
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)
+
+
+ +
+B
8.0V
+
R15
33K
L4 L5
14.7V
DISCRIMINATOR
R81
150 1W
+B
R84
3.3K
R44
+B
270
1/4W
+B
PLL
IC2
10.9V (0V)
FM +B
12bits PROGRAMABLE CONT.
DIVIDER
Q14
D5
+12V
11.1V
(11.3V)
11.4V
(11.3V)
R59
1.2K
R58 12K
R48 1K
6
R47 3.3K
5
R46 3.3K
4
R45 3.3K
3
J K
CHANNEL FREQUENCY (MHz)
3.5V (3.0V)
CHANNEL
OSC FREQUENCY
VT VOLTAGE
CHANNEL
VT VOLTAGE
C
C33 Q3 R31
47K
0.01
0V
0.2V
R30 Q7
C34 560
0.01
BUFFER
Q4
0V
DE-EMPHASIS
75uS: ON
50uS: OFF
B
IC1 : LA1837
IC2 : LC72131
Q1,3,4,6,7 : 2SC4081(R,S) or
2SC4116(Y,GR)
Q2,12,14
: 2SA1576A(R,S) or
2SA1586(Y,GR)
Q10,11 : 2SD1757K
D1 : DA204U or
1SS302 or
BUFFER
MA143A
(S METER)
D3 : RD8.2ES(B2) or
R38 Q6
MTZJ8.2(B)
1K
D4 : RD5.1ES(B2) or
+ MTZJ5.1(B)
D5 : RD2.7ES(B2) or
R39
MTZJ2.7(B)
10K
D8,11,13 : MA111
D9 : RD3.3ES(B2) or
F
MTZJ3.3(B)
+B
SIGNAL LINE
GND LINE
+B B LINE
B LINE
B
R79 3.3K
W82
MUTING
L6
ON:0.7V
C70
OFF:-2.5V
8200P
Q10
W83
L7
Q11
R74 +14.7V
47K -16.6V
C71
16.6V
8200P
ON:3.0V
R78
OFF:-2.5V 820
ON:3.0V R76
Q12
OFF:3.5V 1.8K
14.7V
MUTING
CONT. ON:2.3V R77
1K
OFF:4.8V
+14.7V +14.7V 4
14.7V
5
3
C77 R29 6
100P 1K
S1
FM :100kHz 75uS
AM :10kHz
W56
FM :50kHz 50uS
AM :9kHz
CH.SPACE
DE-EMPHASIS
VR-5080/5090/5700/5900 (1/6)
KRF-X7775D/X7775D-S/X9995D/X9995D-S (1/6)
L M
(X05-5100-11)
1 2 3
417.3 414.3 411.3 5.0V
+5V +5V
R54 100 C42 10
Q12
1 2 3 4.9V 2.3V
2.40 0.5 2.35 0.5 2.30 0.5
4.9V
D4
R52 C41
R51 10K 4.7
R50
100 47K C40 0.01
Q11
4.8V 3.5V R49 4.7K
4.3V
R46 C39
5.6K 330P
Q10
3.4V R47
2.3V 4.7K
R44
C37 C38
10K
2.0V
10P 4700P
Q9
C36 R43 0.5V
0.22 10K
R42
100 C35 0.01
Q8
1.0V
R40 C33 C34
100K 4.7 470P
R37 0.6V
100 C31 10
C32 0.047
Q7
R38 2.2K 3.7V
R36
100 3.4V
R34
2.2K C30 0.01
R32
2.2V R35 2.2K
1.5K Q6
R31 1K
1.6V
3.4V
4.4V
Q5
5.0V
2.2V
R29
1K 3.7V 0.7V
C28 0.01
Q4
R30 1K
R28 680
1.4V
CF1
R12 10 C9 10
+5V
C10 1000P
DOWN
L3 D3
CONVERTER
23n
R14
4.6V
47K
IC1
1.9V 5 4
4.6V
C11 C12
6 3 4.5V
4P 10P
CN1
R15 C13 C14 R16 Q3
C8 2.5V 2
15 DET
1000P 7
2.2 4P 1P 10
14 S-LEVEL
8 2.3V 1 C15 5P
2.5V
+5V
IC3
2.7V 4 3
5 2
13 SD
L1
12 STEREO
C2
6 1 10P
+5V
3.0V 0.8V
11 R
X13-A/6
-WH1
3/6
10 GND
9 L
A BH-1
8 +15V
7 -17V
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.
6 T. MUTE
5 PLL DT MODULATION
MODE CARRIER
4 PLL CLK
FREQUENCY
3 PLL CE
2 PLL DO
FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot)
1 CH.SPACE
AM 1000(999)kHz 400Hz MONO 30% MOD
KRF-X7775D/X7775D-S/VR-5080/5090
Y05-4210-10
N O
CN1
X25-B/11
7 +B(+5V)
-CN103
6/6
6 OUT
B
5 GND
4 FFC GND
EM-3
4 3 CE
3 2 DATA
2 1 CLK
IC1 : UPC1687G
IC2 : LV2105V
IC3 : UPC2748T-E3
Q3 : 2SC5065(O,Y)
Q4-6 : 2SC4178(F13,F14)
Q7,11,12 : 2SB1218A(Q,R) or
2SA1576A(R,S)
Q8-10 : 2SD1819A(Q,R) or
2SC4081(R,S)
D1,2,4 : MA111
D3 : KV1832E
+B
X1
12.800MHz
PLL
IC2
16 2.6V
2.6V 1
15
R24
0V
14
1K 2
2
R23
4.9V
1K 3
3
13
R22
1K 4
4
C19
470P
12
4.9V 5
11
+B
4.2V 6
10
7
8
9 2.3V
R25
4.7K
R19 470
L4 C16
100n 0.022
R18 C17
0.8V
180K 220P
R21 10
+5V
RF
ANTENNA
J1
R2 C1
12 10P
ANT INPUT
DEVIATION
60dB
60dB