Kenwood AR-304 Service Manual page 10

A B
TUNER UNIT (X05-XXXX-XX)
Q Q
3 7 6 3 1 5 1 5 0
1
2
(K,P,M,X) TYPE
A1 (W02-2622-05)
1 ANT1
RF AMP
C2
10P
ANT2
2
GND
3
3
GND
4
FET : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-3 : HVU202 or
1T362
T E
L 1 3 9 4 2 2 9 6 5 1 3
(E,T) TYPE
4
A1 (W02-2584-05)
E1
J1
RF AMP
C1 C2 C4 0-100
1 1 ANT1 27P 15P 0-5P C6
FM 75
L2 10P FET1
2 2 GND
3
GND
D1
4 3 GND
AM ANT
4 GND
FET1 : 2SK302
TR1 : 2SC2714
5 TR2,3 : 2SC2413
D1-4 : SVC220 or
KV1440
(Q) TYPE
A1 (W02-2586-05)
RF AMP
R4
C1 C2 C4 0-100
1 27P 27P 0-5P C6
FET1
6 10P
ANT1 L2
2 GND
D1
3 GND
w w w
4
GND
FET1 : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-4 : HVM25 or SVC208
D5 : HSU277 or 1SS356
7
C D
C40 2P
L9
10uH
D1
R42
R41 10K
100K
L1
L2
1uH
FM FRONT-END
MIX DISTORTION(ST)
VT 5
IFT
TR1
R2 C4 IF-OUT 7
0-100 3P
FET
R14
68 +B 6 6.7V
VCC +B
OSC
R11 C17 8
OUT
TR2 100K- 100P
OSC
680K
C13
TR3
8P
C14
OSC
27P
BUFFER
FM FRONT-END
MIX DISTORTION(ST)
VT 5
IFT
TR1
R4 C9 7
5P
IF-OUT
R5 R11
100 0-100 VCC 6 6.7V
C23 OSC 8
TR2 100P
C19
OSC TR3
8P
OSC
BUFFER
FM FRONT-END
MIX DISTORTION(ST)
VT 5
IFT
TR1
C9 IF-OUT 7
5P
R5 R11
100 0-100 VCC 6 6.7V
x a o C23 OSC 8
TR2 100P
C19
OSC
TR3
10P
. i OSC
BUFFER
E F
CN2
1 2
FM TUNING
+
LEVEL
+
R23
REG
AM AM AM
ALC
OSC MIX RF.AMP
BUFF
AGC
DET
AM IF
SD
COMP
AM
S-METER
FM AM/FM
S-CURVE
S-METER
IF-BUFF
TUNING
DRIVE
FM
FM IF
DET
GND
L3
C81
1
+
+B
Q Q
3 7
R43
220
IF AMP
FM : 98MHz : 4.3V
+B
6.5V C5
0.01 R11
5.9V
Q2
1.6V
R1 C88 A 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
UNLOCK POWER
ON
DETECTOR
RESET
2
C B I/F DATA SHIFT REGISTER LATCH UNIVERSAL COUNTER
u 1 6 3 0V
y (10.6V)
AUTO: 7.1V
X1
7.2MHz
C44
470P
G H
2 4
8 9 9
C24
330P R25 C26
+ +
FM/AM/MPX
C37 R33
SYSTEM IC 10u16 1K
+
+
IC1
C38
4.2V 10u16
2.8V
+
DECODER
ANTI-BIRDIE
P-DET STEREO
SW
MUTE
VCO FF FF FF PILOT
304KHz 38K 19K 2 19K 8 DET
STEREO
DRIVE
VCC
7.1V
(3.9V)
4.3V
(0V)
+ C17
1u50
+
8.8V
(9.2V) +
+B
C89
6 3 1 L4 5 L5 1 5 0 8 9
4700P
C90
+
4700P
8.1V
14.2V
DISCRIMINATOR
R81
+B
150 1W
R84
1K
+B
+B
PLL
IC2
10.6V
(0V)
FM +B
SW
Q14
+B
12bits PROGRAMABLE
DIVIDER
10.7V
R59
10.3V 1.2K
C86
470P
m
c o
.
R48 1K
6
R47 1K
5
R46 1K
4
R45 1K
3
I J
2
8 9 9
C
Q3
C33 R31
47K
0.01
3.6V
0V
0V
0V
[0.6V] 14.4V
R30 Q7
C34 560
0.01 DETECT
Q4 BUFFER
0V
EMPHASIS
75uS: ON
50uS: OFF
B
50uS
[75uS]
S LEVEL F
BUFFER
8.0V
Q6
R38
1K
4.3V
+
3.7V
R39
10K
+B
2 4 9 8 2 9 9
+15V
W82
L6
C70
8200P
W83
L7
C71
8200P
3.4V Q12 3.5V
MUTING
DRIVE 2.8V
+15V
C77 R29
100P 100
S1
FM :100kHz 75uS
AM :10kHz
FM :50kHz 50uS
AM :9kHz
CH. SPACE
DE-EMPHASIS
W56