Kenwood AR-404 Service Manual page 9

A B
TUNER UNIT (X05-498X-XX)
1
2
(K,P,M,X) TYPE
A1 (W02-2622-05)
1 ANT1
2 ANT2
3
GND
3
4 GND
FET : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-3 : HVU202 or
4
(E) TYPE
A1 (W02-2584-05)
E1
J1
C1 C2 C4
1 1 ANT1 27P 15P 0-5P
FM 75
L2
2 2 GND
3
GND
D1
4 3 GND
AM ANT
4 GND
5
FET1 : 2SK302
TR1 : 2SC2714
TR2,3 : 2SC2413
D1-4 : SVC220 or
KV1440
IC1 :
D1 : DA204U or
IC2 : LC72131
MA143A or
1SS302
Q1,3,4,6,7 : 2SD1819A(Q,R) or
D3 : RD8.2ES(B2) or
2SC4081(R,S) or
MTZJ8.2(B) or
2SC4116(Y,GR)
HZS8.2N(B2)
6
Q2,12,14 : 2SB1218A(Q,R) or
D4 : RD5.1ES(B2) or
2SA1576A(R,S) or
MTZJ5.1(B) or
2SA1586(Y,GR)
HZS5.1N(B2)
Q10,11 : 2SD1757K
D5 : RD2.7ES(B2) or
MTZJ2.7(B) or
HZS2.7N(B2)
D8,11,13 : MA111
D9 : RD3.3ES(B2) or
MTZJ3.3(B) or
HZS3.3N(B2)
A1 :
7
C D
C40 2P
L9
10uH
D1
R41
100K
L1
L2
1uH
FM FRONT-END
MIX DISTORTION(ST)
VT 5
IFT
TR1
RF AMP R2 C4 IF-OUT 7
0-100 3P
C2
FET
10P
R14
68 +B 6
VCC
OSC
R11 C17
OUT 8
100K- 100P
TR2
OSC
680K
C13
TR3
8P
C14
OSC
27P
BUFFER
1T362
FM FRONT-END
MIX DISTORTION(ST)
IFT
TR1
RF AMP
R4 C9
0-100 5P
C6 IF-OUT
10P
FET1
R5 R11
100 0-100 VCC
C23 OSC
TR2
100P
C19
TR3
OSC
8P
OSC
BUFFER
DIGITAL LINE
SIGNAL LINE
GND LINE
B LINE
+B
B LINE
B
E F
CN2
1 2
FM TUNING
LEVEL
R23
R42
10K
AM AM
ALC
OSC MIX
BUFF
SD
COMP
FM
S-CURVE
S-METER
FM
FM IF
DET
6.7V
+B
+
R43
220
IF AMP
6.6V
C5
0.01
VT 5
6.0V
Q2
1.6V
A C1
R1 C88
7 100 3300P CF1 0.022
C84
0.022
Q1
1.0V
1.2V
+
+
6 6.7V R44
+B
270
1/4W
8
R51
5.6K
+
+
+
2.5V
0.9V
REFERENCE PHASE DETECTOR
DIVIDER CHARGE PUMP
UNLOCK POWER
DETECTOR ON
RESET
2 DATA SHIFT REGISTER LATCH
C B I/F
0V
(10.6V)
AUTO: 7.1V
X1
7.2MHz
C44
470P
G H
+
+
R25 C26
+ +
FM/AM/MPX
SYSTEM IC
+
IC1
2.8V
REG
DECODER
ANTI-BIRDIE
AM
RF.AMP
P-DET STEREO
SW
AGC
MUTE
AM IF DET
VCO FF FF FF
304KHz 38K 19K 8
2 19K
AM
S-METER
AM/FM
IF-BUFF
TUNING STEREO
DRIVE DRIVE
GND VCC
7.1V
(3.9V)
4.3V
L3 (0V)
+
+
C81
8.8V
1
(9.2V) +
+B +B
L4 L5
+
+B
8.1V
R11 14.2V
DISCRIMINATOR
R81
+B
150 1W
R84
CF2
1K
+B
+B
PLL
IC2
0V
(10.6V)
FM +B
SW
1/2
Q14
+B
SWALLOW COUNTER 12bits PROGRAMABLE
1/16,1/17 4bits DIVIDER
10.7V
R59
10.3V 1.2K
C86
UNIVERSAL COUNTER 470P
R48 1K
6
R47 1K
5
R46 1K
4
R45 1K
3
I J
Q3
C33 R31
47K
0.01
0V
0V
0V
[0.6V]
C37 R33
10u16 1K
R30
C34 560
+
0.01
C38
Q4
4.2V 10u16
0V
+
EMPHASIS
75uS: ON
50uS: OFF
B
50uS
[75uS]
PILOT
DET
S LEVEL F
BUFFER
8.0V
Q6
R38
1K
4.3V
+
3.7V
C17
R39
1u50
10K
+B
C89
4700P
+15V
C90
4700P
W56