A
C
E
G
I
B
D
F
H
J
2
1
3
5
7
4
6
KRF-V4550D/V4550DE/V4550D-S
Y05-4332-70
100
R4
R2
33K
0-5P
GND
4
ANT1
GND
GND
3
2
1
C3
27P
L1
C1
27P
C2
15P
C14
0.1
C5
3-7P
R1
100K
R3
100K
L2
C4
10P
C6
R6 33K
C7 5-10P
L3
L4
0-100
R15
10K
1.5K
C21
10P
R17 470-
C16
47P
7
C9
C15
3.9K
2-6P
C17
L7
R12
C19
C20
8P
27P
R14 10K
R16
220
R18
C8 0-6P
R7 33K
R5
1000P
L5
C10
L6
5P
C12 2P
680K-1.5M
R8
680
R9
C1
1
27P
0.1
C22
1-3P
100
R19
150K- 560K
C23 OSC
100P
0-100 VCC
8
6
R11
IF-OUT
IFT
VT
0.1
C13
5
270
R44
100
0.01
C3
10
R8
R2
220
C2 0.01
3.3K
R7 820
680
R4
CF1
CF2
R12
100
1/4W
3P
C75
R41 100K
L1
R42 10K
1uH
L2
S-METER
DRIVE
TUNING
FM
AM/FM
S-CURVE
1
2
FM IF
S-METER
FM
DET
IF-BUFF
3
4
GND
5
AM
OSC
BUFF
ALC
30
29
SD
COMP
AM
AM IF
RF.AMP
AM
MIX
REG
28
AM
AGC
27
26
VCC
8
6
7
DRIVE
STEREO
9
12
10
11
13
15
14
MUTE
DET
25
24
23
22
38K
304KHz
VCO
FF
2
19K
FF
DECODER
ANTI-BIRDIE
P-DET
21
SW
STEREO
20
19
PILOT
DET
FF
19K
8
18
17
16
47P
0.047
C20
10u10
C19
+
0.047
C22
3.3u35
C21
+
R25
C26
27K
0.018
330P
10u16
C23
+
4.7u25
C27
C25
180P
VR1
10K
4.3K
4.3K
R27
R28
2.2u50
C29
+
2.2u50
C28
+
0.022
C31
C79
0.022
C30
C80
10u16
C38
+
10u16
C37
+
0.047
C12
22
R16
100
R14
10u16
C14
+
R17 3.6K
C45 22P
+
C15 1u50
3.9K
3K
R18
0.47u50
C16
+
R19
C17 1u50 +
8.2K
L4
1
C81
L3
0.047
C1
1
47u16
C10
+
2
1
15K
R23
R83 1K
47P
C76
C41 47P
21
C B I/F
DIVIDER
REFERENCE
3
2
1
4
5
2
22
14
SWALLOW COUNTER
1/16,1/17 4bits
ON
DETECTOR
RESET
DATA SHIFT REGISTER LATCH
6
7
8
10
9
11
POWER
CHARGE PUMP
PHASE DETECTOR
UNLOCK
20
19
18
17
16
UNIVERSAL COUNTER
12bits PROGRAMABLE
DIVIDER
1/2
15
13
12
7.2MHz
X1
C42
10P
1.2K
R59
R58 12K
10K
R48 1K
R47 1K
R46 1K
R45 1K
470P
C44
47u16
C48
+
10u16
C46
+
1000P
2.2u50
+
0.022
R53
1K
R54
R51
5.6K
100
R52
470
R50
C47
1/4W
1K
R56
100P
C52
1K
R57
470P
C51
100P
C50
33K
R55
R43
220
2
1
4
3
E1
C1
0.022
C18
L5
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
DET
S-LEVEL
SD
STEREO
R
GND
L
+12V
-12V
T. MUTE
PLL DT
PLL CLK
PLL CE
PLL DO
CH.SPACE
R82 2.7K
1u50
C72
+
47u16
C73
+
R1
R5
R6 220
0.01
C5
R11
33
C6
0.01
390
R9
1K
R10
0.01
R81
82 1W
R80 22K
4.7u35
C32
+
R40
10K
1K
R38
R39
1K
L6
6800P
C70
L7
C71
6800P
820
8.2K
R75
3.9K
R72
3.9K
R73
1K
1.8K
R76
R78
R77
47K
R74
C83
100P
6
3
5
4
3
5
4
6
R84
1K
1K
C78
C49
2.2K
4700P
4700P
C24
R85
1M
1M
R86
R87
1M
0.022
C85
0.022
C84
R88 56K
470P
C86
3300P
C88
33K
R89
R20
1
C91
R79 1K
R33
R34
VREF
T
.METER
B
+B
680
R3
12P
C43
+12V
+B
+B
+B
+12V
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+12V
+12V
12V
+12V
+12V
+B
+B
+12V
+12V
330P
W660
C82
47u16
C7
+
1K
R49
R15
33K
C4
C36 0.01
+B
3.9K
1K
R36
100
R35
R37
KV1440
RF AMP
: 2SC2714
: SVC220 or
: 2SC2413
FET1 : 2SK302
TR2,3
D1-4
TR1
D1
D2
FET1
OSC
D4
TR2
D3
BUFFER
OSC
TR3
DISTORTION(ST)
FM FRONT-END
TR1
MIX
GND
75
J8
Q201
D21
1
D201
ADJ
FM TUNED
PLL
D204
FM +B
Q214
FM DET/MPX
AM DET
CN4
MUTING
CN5
DISTORTION
Q202
FM IF AMP
D203
(S METER)
Q206
D209
Q210
Q211
Q212
CONT.
MUTING
D213
AM
-CN6
X07-A/3
2/4
DIGITAL LINE
GND LINE
SIGNAL LINE
B LINE
B LINE
AM RF
BUFFER
ATT
IC201
:
IC202
: LC72131
LA1837
Q201,206,207 : 2SD1819A(Q,R) or
2SC4081(R,S)
Q202,212,214 : 2SB1218A(Q,R) or
2SA1576A(R,S)
Q210,211
: 2SD1757K
D201
: DA204U or
1SS302 or
MA143A
D203
: MTZJ8.2(B) or
HZS8.2N(B2)
D204
: MTZJ5.1(B) or
HZS5.1N(B2)
D211,213
: MA111
D209
: MTZJ3.3(B) or
HZS3.3N(B2)
DISCRIMINATOR
BUFFER
Q207
FM
A1 (W02-2584-05)
IC202
IC201
TUNER UNIT (X07-3142-71) (B/3)
A
KRF-V4550D/E/-S (1/4)
3.6V
8.2V
0V
(2.7V)
2.3V
1.3V
(2.3V)
0V
7.1V
(9.2V)
8.8V
(3.9V)
7.0V
1.7V
(1.3V)
0V
4.3V
4.3V
4.3V
3.3V
2.8V
3.6V
3.6V
2.5V
(FM98MHz)
1.0V
(2.6V)
0V
0V
2.6V
4.7V
(0V)
1.8V
(0V)
11.8V
1.0V
(5.1V)
8.2V
3.6V
6.3V
1.2V
6.6V
1.2V
3.5V
4.1V
8.2V
OFF: -1.8V
OFF: 4.8V
4.3V
11.7V
2.7V
(0V)
0V
6.8V
(0V)
4.4V
ON: 0.7V
ON: 0.2V
3.8V
0V
(1.3V)
2.8V
7.3V
3.6V
3.6V
0V
0.2V
8.2V
(12.0V)
0V
MONO: 0V
11.1V
3.5V (3.0V)
-11.8V
ST: 7.1V
0.5V
10.6V
AM: 0V
FM: 7.3V
(@FM98MHz)
3.8V
5.2V
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
supply circuit) before the appliance is returned to the customer.
MODE
CARRIER
MODULATION
ANT INPUT
FREQUENCY
DEVIATION
FM
98MHz
1kHz
STEREO 67.5kHz 7.5kHz(Pilot)
60dB
AM
1000(999)kHz
400Hz
MONO 30% MOD
60dB
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.
