Kenwood KRF-V7771D Service Manual page 24

A B
TUNER UNIT
(X11-3800-XX) (C/7)
(X11-3813-00) (C/7)
Q Q
3 7 6 3 1 5 1 5 0
1
D601
AM RF
L601
2
L602
1uH
(J) TYPE
FM FRONT-END
A601 (W02-2621-05)
RF AMP
R2
0-100
1 ANT1 C2
3 FET
15P
2 ANT2
3 GND
FET : 2SK302
TR1 : 2SC2714
4 GND
TR2,3 : 2SC2413
D1-3 : HVU202 or
1T363
D4 : HSU277 or
1SS356
T E
L 1 3 9 4 2 2 9 6 5 1 3
4
(K,P,Y,M,C) TYPE
A601 (W02-2622-05) FM FRONT-END
J601 RF AMP R2
0-100
1 1 ANT1 C2
Ω
FM 75
FET
10P
2
ANT2
2
3 3 GND
GND
AM
4
4 GND
5
FET : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-3 : HVU202 or
1T362
E601
IC27 : TC9413P
IC28,43 : NJM4565D
IC44 : TC9184AP
IC601 :
IC602 : LC72131
IC603 : MC13028AM
6
Q601,603,604,606-609 : 2SC4081(R,S) or
2SC4116(Y,GR)
Q602,612,614,615 : 2SA1576A(R,S) or
2SA1586(Y,GR)
Q610,611 : 2SD1757K
w w w
D5,6 : DA204U or
1SS302
D601 : DA204K
D603,606 : RD8.2ES(B2) or
HZS8.2N(B2)
D604 : RD5.1ES(B2) or
HZS5.1N(B2)
D605 : RD2.7ES(B2) or
HZS2.7N(B2)
D607,608,610,611,613,614 : MA111
D609 : RD3.3ES(B2) or
7 HZS3.3N(B2)
D612 : 1SS133 or
HSS104
D615 : U1BC44
C D
CN12
2
C640 2P
L609
10uH
R642
R641 10K
100K
MIX DISTORTION (ST)
VT 5
IFT
TR1
C4 IF-OUT 7
5P
R14
68 VCC 6
R11 C17
OSC 8
100K- 100P
OSC TR2
680K
C13
TR3
8P
C14
C676
OSC
47P
27P
BUFFER
MIX DISTORTION (ST)
VT 5
IFT R601
TR1
C4 IF-OUT 7 100
3P
+
CF601
R14
68 +
+B 6
VCC
OSC
R11 C17 OUT 8
OSC TR2 100K- 100P
R688
C13 680K
56K
TR3
8P
C14
OSC
27P
BUFFER
+
2.5V
(2.5V)
SIGNAL LINE
GND LINE
+B +B LINE
-B +B LINE
REFERENCE
2
C B I/F
x a o
. i
X601
7.2MHz
C644
470P
E F
1
C627
X
C625
10u25
FM
X
TUNED C624 R625 C626
+
ADJ +
0.022
FM, MPX
AM SYSTEM
+
IC601
2.9V
(2.9V)
REG
AM AM AM
ALC
OSC MIX RF.AMP
P-DET
BUFF
AGC
AM IF
DET
VCO
SD
304KHz
COMP
AM
S-METER
FM AM/FM
S-CURVE
S-METER IF-BUFF
TUNING STEREO
DRIVE DRIVE
FM
FM IF
DET
4.3V
(0V)
GND VCC
L603 8.0V
(8.0V)
C681
1
+
+B
Q Q
3 7
L604 (GRN) L605 (WHT)
FM AMP
+B
C605
0.01 R611
6.3V 6.9V
33
FM DET MPX
Q602
1.7V
1.6V
C601
0.022
C684
Q601 0.022 R687
1.1V
A 1M
CF602
R644
270
+B +B
1/4W
+B
R651
+
5.6K
+
1.0V PLL
(1.0V)
IC602
1/2
PHASE DETECTOR
DIVIDER CHARGE PUMP
SWALLOW COUNTER 12bits PROGRAMABLE
1/16,1/17 4bits DIVIDER
UNLOCK POWER
ON
DETECTOR
RESET
DATA SHIFT REGISTER LATCH UNIVERSAL COUNTER
u 1 6 3
y
10.1V (10.3V)
0V (11.6V)
G H
2 4
8 9 9
C633 Q603 R631
47K
0.012
0V
[0V]
0.2V
0V
+ +
[0.6V]
C637 R633
10u10 1K
R630
C634 560
+
0.012
4.3V C638
Q604
(4.3V)
10u10
0V
[0V]
+
EMPHASIS
75uS: ON
50uS: OFF
B
DECODER
50uS
ANTI-BIRDIE
[75uS]
STEREO
SW
MUTE
FF FF FF PILOT
38K
19K 2 19K 8 DET
3.5V
15.0V
R635
6.9V
Q607
(3.6V)
100
8.0V
C
R638
Q606
2.9V
1K
3.7V
4.3V
R637
3.9K
+
+
C617
+
1u50
+
6 3 1 5 1 5 0 8 9
+
R681
150
+B +15V
1W
E
AM +B
11.4V
Q615
11.2V
+B +B
10.7V
11.3V W686
FM +B
Q614
11.5V
+B
R659
1.2K
10.7V
C686 m
470P
c o
.
R648 1K
6
R647 1K
5
R646 1K
4
R645 1K
3
I J
2
8 9 9
D
1.0V
+ + +
Q608
1.6V
8.1V
R671
220
+B +B
1/4W
8.1V
1/8 VCO
AGC
AM STEREO
DETECTOR
IF
AMP
PILOT
DETECTOR
SIGNAL
QUALITY
DETECTOR
IC603
AM STEREO
+
+ 0.4V
DECODER
+
2 4 9 8 2 9 9
R640
1K
W682
L606
0V
[0V]
MPX FILTER
MUTE
Q610
W683 -2.4V
[0.7]
L607
0V 0V
-2.4V
[0V] [0V]
[0.7]
C671
Q611
8200P
R674
47K
0V
[0V]
3.7V
[3.5V]
-2.4V
[3.5V] R676
Q612
1.8K
5.0V
T. MUTE R677
[2.7V]
4.7K
C688 DRIVE
100P
+15V
USED (M,Y,C) TYPE
FM:100kHz
CH SPACE DE-EMPHASIS
75uS
S601
W662
AM:10kHz
FM:50kHz
50uS
AM:9kHz