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A
B
TUNER UNIT (X07-3142-71) (B/3)
1
2
A1 (W02-2584-05)
FM FRONT-END
E1
RF AMP
J8
FET1
C1
C2
C4
FM
1
1
ANT1
27P
15P
0-5P
C6
75
3
L2
10P
2
2
GND
D1
3
3
GND
GND
4
AM
4
GND
FET1 : 2SK302
TR1
: 2SC2714
TR2,3
: 2SC2413
D1-4
: SVC220 or
KV1440
4
IC201
:
LA1837
IC202
: LC72131
Q201,206,207 : 2SD1819A(Q,R) or
+B
B
2SC4081(R,S)
Q202,212,214 : 2SB1218A(Q,R) or
2SA1576A(R,S)
Q210,211
: 2SD1757K
D201
: DA204U or
1SS302 or
MA143A
5
D203
: MTZJ8.2(B) or
HZS8.2N(B2)
D204
: MTZJ5.1(B) or
HZS5.1N(B2)
D209
: MTZJ3.3(B) or
HZS3.3N(B2)
D211,213
: MA111
CAUTION: For continued safety, replace safety critical components only with manu-
facturer's recommended parts (refer to parts list).
indicates safety critical compo-
nents. 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
6
supply circuit) before the appliance is returned to the customer.
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.
MODULATION
MODE
CARRIER
FREQUENCY
DEVIATION
FM
98MHz
1kHz
STEREO 67.5kHz 7.5kHz(Pilot)
7
AM
1000(999)kHz
400Hz
MONO 30% MOD
C
D
R3
680
C36 0.01
R42 10K
R41 100K
L1
D201
AM RF
MIX
DISTORTION(ST)
VT 5
IFT
TR1
C9
7
5P
IF-OUT
R5
R11
100
0-100 VCC
6
7.3V
+B
C23 OSC
8
TR2
100P
C19
R43
OSC
TR3
220
8P
OSC
BUFFER
R1
C88
100
3300P
+
DIGITAL LINE
SIGNAL LINE
GND LINE
B LINE
B LINE
X1
7.2MHz
KRF-V4550D/E/-S (1/4)
ANT INPUT
60dB
60dB
E
F
CN4
1
2
FM TUNED
+
ADJ
+
R23
15K
C24
330P
R25
C26
27K
0.018
+
2.8V
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
STEREO
DRIVE
DRIVE
FM
FM IF
DET
GND
VCC
L3
C81
8.8V
1
+
(9.2V)
+B
8.2V
10.6V
R15
3.8V
FM IF AMP
(@FM98MHz)
+B
33K
6.6V
C5
0.01
R11
33
6.3V
Q202
1.8V
C1
CF1
0.022
C84
Q201
0.022
CF2
ATT
1.2V
1.2V
DISCRIMINATOR
+
R44
+B
270
FM: 7.3V
1/4W
AM: 0V
5.2V
R51
5.6K
+
+
+
2.5V
PLL
1.0V
IC202
1/2
REFERENCE
PHASE DETECTOR
DIVIDER
CHARGE PUMP
SWALLOW COUNTER
12bits PROGRAMABLE
1/16,1/17 4bits
DIVIDER
UNLOCK
POWER
DETECTOR
ON
RESET
2
DATA SHIFT REGISTER LATCH
UNIVERSAL COUNTER
C B I/F
0.5V
0V
(12.0V)
R58 12K
ST: 7.1V
MONO: 0V
C44
470P
G
H
Q207
+
+
BUFFER
FM DET/MPX
C37
R33
AM DET
10u16
1K
+
IC201
C38
10u16
4.3V
2.8V
+
DECODER
ANTI-BIRDIE
P-DET
STEREO
SW
MUTE
VCO
FF
FF
FF
PILOT
304KHz
38K
19K
19K
8
DET
2
BUFFER
(S METER)
7.0V
(3.9V)
Q206
R38
1K
4.1V
+
3.5V
R39
10K
+
+
+
+
+B
+B
+
L4
L5
DISTORTION
+B
R84
1K
L6
+B
+B
C70
6800P
L7
C71
6800P
11.7V
(0V)
Q212
MUTING
FM +B
CONT.
Q214
+12V
+12V
11.8V
11.1V
R59
1.2K
C86
470P
R48 1K
6
R47 1K
5
R46 1K
4
R45 1K
3
KRF-V4550D/V4550DE/V4550D-S
Y05-4332-70
I
J
3.5V (3.0V)
8.2V
CN5
15
DET
14
S-LEVEL
13
SD
R79 1K
12
STEREO
11
R
MUTING
C83
X07-A/3
ON: 0.7V
10
GND
Q210
OFF: -1.8V
-CN6
100P
2/4
9
L
Q211
R74
+12V
8
+12V
A
47K
12V
7
-12V
-11.8V
R76
1.8K
ON: 0.2V
R77
OFF: 4.8V
1K
6
T. MUTE
4
5
PLL DT
5
4
PLL CLK
3
3
PLL CE
6
2
PLL DO
1
CH.SPACE
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