Kenwood KR-FV4550 Service Manual
70%
AUDIO VIDEO SURROUND RECEIVER
SPEAKER MUTE
STANDBY
POWER
LISTEN MODE
SOUND
SOURCE DIRECT
AUTOBAND MEMORY
INPUT SELECTOR
VOLUME CONTROL
UPDOWN
PROLOGIC 3 STEREO
DOLBY
DIGITAL
INPUT MODESET UP DIMMER MONITOR
PHONES
ON/STANDBY
ON OFF
6CHINPUT
FOR EXTRA DIGITAL AUDIO FORMAT
MULTI CONTROL
DIGITAL IN
OPTICAL
DVD
CD/DVD
VIDEO
VIDEO 2
COAXIAL
VIDEO 1VIDEO 2
PLAY INREC OUT
SYSTEM CONTROL
SUB WOOFER PRE OUT
AC OUTLET
SWITCHED
TOTAL 90W MAX
AC 230V~50Hz
FM
75Ω
GND
AM
MONITOR
PLAY IN
PLAY IN
REC OUT
AUDIO
L
R
MD/TAPE1
CD/DVD
PHONO
GND
REC OUT
FRONT
L
CENTER
SURROUND
SUB WOOFER
DVD/6ch INPUT
R
FRONT SPEAKERS CENTER SPEAKERS
KRF-V4550D/V4550DE
KRF-V4550D-S
SERVICE MANUAL
Knob *
(K27-)
Knob *
(K29-)
Phone jack
(E11-0272-05)
Knob *
(K29-)
Front glass
(B10-3679-12)
Knob *
(K29-)
Knob *
(K29-)
Knob *
(K29-)
© 2001-1/B51-5701-00 (K/K) 1704
Panel *
(A60-)
Knob *
(K29-)
Pin jack
(E63-1080-05)
Pin jack
(E63-1139-05)
Lock terminal board
(E20-0321-05)
* Refer to parts list on page 24.
Pin jack
(E63-1143-05)
Optical receiving module
(W02-2716-05)
Pin jack
(E63-1141-05)
Pin jack
(E63-1146-05)
Miniature phone jack
(E11-0293-05)
Screw terminal board
(E70-0122-05)
Metallic cabinet *
(A01-)
Power cord bushing
(J42-0083-05)
Lock terminal board
(E70-0057-05)
AC power cord
(E30-2942-05)
AC outlet
(E03-0149-05)
KRF-V4550D/V4550DE/V4550D-S
FM indoor antenna (1)
(T90-0877-05)
Remote control unit (1)
(A70-1470-05): RC-R0513
Batteries (R6/AA) (2)
AM loop antenna (1)
(T90-0852-05)
Battery cover (A09-1178-08)
Resetting the Microcomputer
The microcomputer may malfunction (unit cannot be operated,
or shows an erroneous display) if the power cord is unplugged
while the power is ON, or due to some other external factor. If
this happens, execute the following procedure to reset the
microcomputer and return the unit to its normal operating
condition.
• Please note that resetting the microcomputer will clear the contents of the memory and returns the unit to the state it was in when
it left the factory.
With the power cord plugged in, turn the POWER key
OFF. Then, while holding down the ON/STANDBY key,
press POWER.
CONTENTS / ACCESSORIES
Contents
CONTENTS / ACCESSORIES .................................. 2
BLOCK DIAGRAM ......................................................3
ADJUSTMENT ............................................................4
PC BOARD ................................................................ 5
Please refer to KRF-V4530D(B51-5597-00) on microprocessor MN101C35DRA4(same function as
MN101C35DRA)
SCHEMATIC DIAGRAM ............................................ 9
EXPLODED VIEW ....................................................23
PARTS LIST..............................................................24
SPECIFICATIONS ......................................Back cover
Accessories
2
LINE BUF
PHONO EQ
TUNER
AK4527
LPFLPF LPF LPF
x2x2 x2 x1
M62446SP
6ch E. VOL
with 2ch
TONE CONT.
x0.5
BUF
IC113
+20/0dB
+B HITAP
-B HITAP
+B LOWTAP
-B LOWTAP
VIDEO2
(VIDEO2/MONI.)
VIDEO1
CD
PHONO
MD
/TAPE
MONI
PLAY
REC
OUT
Lch
H, P, Rch
H, P, Lch
Rch
Cch
SWch
SP-A
AC IN
MUTE
+5V
A.V.R
for
u-COM
+15V
A.V.R
A.V.R
-15V
+5V
+7V
-7V
A.V.R
5V
for E. VOL
u-COM
for FIL AC
(AUDIO & VISUAL)
TUNER etc.
for AMP (HI TAP)
for AMP (LOW TAP)
for RELAY SW
J1
IC601,602
SWITCHED
D101
D103
D41
IC103
IC104
-30V
Q54
IC51IC2
IC15
Q7
Q8
Q13
Q1
Q2
Q14
Q11
Q12
Q17
Q5
Q6
IC114
for INPUT SEL.
CIRCUIT
(1/2)
(2/2)
(1/2)
(1/2)
(2/2)
(2/2)
IC111
IC111
IC112
IC110
IC110
IC112
6ch INPUT
DVD
SUB
#S5
#S2
DIG
#S4
R,L
MIX
#S3
LS,RS
#S7
NOSUB
ANA
#S1
REC OUT BUF.
IC107
ANALOG REC
DIGITAL REC
D102
A.V.R
for
DIR etc.
A.V.R
3.3V
IC46
J75
DSP
Lch
Rch
Cch
LSch
RSch
SWch
IC45
for DSP
A.V.R
5V
J1
J1
K1
K2
K4
LSch
RSch
J2
J7
IC101 or
IC102 or
CODEC
(ADC&DAC)
AK4110
IC5
A1
J3
OPTICAL
CD/DVD
COXIAL
COXIAL
DIGITAL
IN
AUDIO
DIGITAL
RECEIVER
6ch INPUT
DVD
AUDIO IN/OUT
20dB AMP
IC105
(VIDEO2/
MONI.)
VIDEO1
/MD
TAPE
(VIDEO2
/MONI.)
MONI.
/12dB ATT
6dB/9dB
IC14
TACT KEY
MAIN
u-COM
IC1
RDS
IC4
LED
ENCODER
FL
BU1923F
HNA-11MS24
ED1
SYNC
DIR
for DSP. AD/DA.
ANALOG 6ch
INPUT SELECTOR
LFE
DA
AD
2
BYPASS
SW
C
LS,RS
L, R
L, R
L
R
C
LS
RS
SW
C LS/RS L/R
+
+
+
+
+
+
+
4700uF
4700uF
3300uF
470uF
2200uF
3300uF
2200uF
+
2
IC2
2
2
(X07)
(X14)
(X08)
BLOCK DIAGRAM
3
KRF-V4550D/V4550DE/V4550D-S
KRF-V4550D/V4550DE/V4550D-S
No.
ITEM INPUT SETTINGS
OUTPUT
SETTINGS
RECEIVER
SETTINGS
ALIGNMENT
POINTS
ALIGN FOR
FIG.
1 DISCRIMINATOR
(A)
98.0MHz 1kHz,
±40kHz dev.
Connect a DC
voltmeter
between
1 and 2
of CN4 on
(X07).
MONO
98.0MHz
L4
(X07)
0V
3
DISTORTION
(STEREO)
98.0MHz
(C)
1kHz, ±40kHz dev.
Selector : L or R
Pilot : ±6kHz dev.
70dBf (ANT. input)
(B)
AUTO
98.0MHz
IFT
(FRONT END
: A1)
Minimum distortion
(L or R)
2
DISTORTION
(MONO)
(A)
98.0MHz 1kHz,
±40kHz dev. MONO
70dBf (ANT. input)
(B)
MONO
98.0MHz
L5
(X07)
Minimum distortion
4 TUNING LEVEL
(A)
98.0MHz MONO 1kHz,
±40kHz dev.
29.2dBf (ANT. input)
(B)
MONO
98.0MHz
VR1
(X07)
Adjust VR1 and
stop at the point
where ED1
(TUNED) goes on.
FM SECTION SELECTOR : FM Adjust NO.1 and NO.2 repeatedly.
70dBf (ANT. input)
DIGITAL IN
OPTICAL
DVD
CD/DVD
VIDEO
VIDEO 2
COAXIAL
VIDEO 1VIDEO 2
PLAY INREC OUT
SYSTEM CONTROL
FRONT SPEAKERS CENTER SPEAKERS
SUB WOOFER PRE OUT
AC OUTLET
SWITCHED
TOTAL 90W MAX
AC 230V~50Hz
FM
75Ω
GND
AM
MONITOR
PLAY IN
PLAY IN
REC OUT
AUDIO
L
R
MD/TAPE1
CD/DVD
PHONO
GND
REC OUT
FRONT
L
CENTER
SURROUND
SUB WOOFER
DVD/6ch INPUT
R
(A)
(B)
(C)
FM SG
FM SG
TV SG
AG
MPX
HTB
TV MPX
AG
AG
AC voltmeter
Oscilloscope
Distortion meter
Dummy antenna
(D)
ADJUSTMENT
SYSTEM CONNECTIONS
4
IC105
IC108
IC107
Q140
Q115
D130
Q113
Q116
Q139
D127
D106
Q132
Q114
IC110
IC106
Q5
Q6
D117
Q12
Q11
D122
D124
D115
D113
D114
IC109
D112
D111
D118
Q117
D128
Q142
D129
Q141
Q16
D1
Q52
Q112
Q53
Q111
Q51
Q121
Q118
D121
IC112
Q4
IC111
D108
D109
D110
Q135
Q136
Q9
Q10
Q3
Q15
Q119
Q120
D120
D190
D107
Q202
Q201
D201
Q211
Q210
IC203
D207
D216
D213
D211
Q209
Q208
Q212
Q206
Q203
Q204
Q214
Q215
Q207
IC601
PHONO EQ.
1
W324
W523
W311
R279
C245
W301
R132
R131
R129
R130
R136
R137
R135
R133
R134
R128
R120
R121
R119
R117
R118
R122
R126
R127
R125
R123
R124
R146
R145
R144
R149
R148
R147
R140
R139
R138
R141
R142
R143
R150
R151
R152
C120C121
C123
C125
W336
C127
C129
C131
C133
C135
C124C126 C119C130
C132
C134
C136
C128
R153
C140
C122
C139
C102
C101
R102
C106
R103
R101
R104
C105
R105
R106
R154
R155
C143
R156
C144
R339
R280
R395
C248
R179
C109
C110
R350
R389
R387
R388
R390
R320
R247
R248
W108
R246
R245
C188 C187
R205
R340
R206
C159
C160
W319
R188
R202
R201
R204
R203
C249C250
R174
R180
W329
W320
R173
R375
R341
R328
R234
R262
R225
R209
R210
W330
R224
R233
W302
C186
R278
R220
W312
R219
R256
R250
C168 C170
C169
C167
C203 C204 C224C218
R241
R239
R240
R242
R197
R198
R266
R276
R277
R265 R196
R195
C173 C174
R164
W514
W513
R162
R161
R163
R332
C163
W506
R329
R334
R333
C157
C164
R187
R177
C162
R178
C265
R222
C158
R175
R186
R176
C152
R185
R244
W305
C161
R270
W306
R327
R223
R221
C185
R159
R243
R200
R325
R199
R268
R324
R257
R302
R249
C191
C192
R301
C213
C210
W313
C211
R267
C267
C228
W333
R378
C227
R377
R307
C197
C198
C195
C196
C216C215
R308
W307
W343
R281
W322
R367
R170
R169
R315
R370
R365
R366
R368
R369
W303
W328
C147
R361
R362
R371
R373
R372
R352
R353
R269
R351
R363
R336
R335
W331
W332
W323
R331
R330
W327
R167
W326
C151
R384
R326
C247
R337
W317
W318
R168
R166
C148
R165
R356
R171
R172
C222
R273
R253
C205
R252
C207
W340
R272
R271
C220
R251
R360
R254
R274
R284
W310
W342
C180
R216
R215
C175
R213
C179
C230C229
R214
R212
C176
R211
R358
R217
R218
R357
W325
W309
R323
W321
W308
R314
R313
W316 W315
W341
W304
R394
R392
R391
R393
C268
R285
W338
W334
W339
W337
W335
R283
R310
R309
C266
R287
EB
BE
BE
EB
EB
EB
BE
EB
EB
EB
EB
EB
EB
E
B
EB
EB
EB
EB
EB
EBE
B
EB
B
E
BE
EB
EB
EB
EB
EB
EB
E
B
14
2815
14
85
14
58
14
58
58
14
41
85
114
15 28
14
85
AM STEREO
R75
C84
C9
C92
C93
C88
R89
R90
C91
C89
C90
C35
C83
C87
W660/R32
W653
R29
C8
C58
C56
C57
C61
C60
C36
R43
R48
R66
R63
R62
R69
R67
R68
R18
R19
R34
R33
R20
C69
C63
W685
C4
W659
W681
W686
C81
C5
R84
C6
C1
C2
C3
C82
C78
C75
C11
C12
C39
C25
C26
C24
C42
C41
C40
C30
C22
C52
C45
C47
C50
C51
C18
C20
C43
C44
R55
R79
R56
R53
R54
R57
R51
R52
R49
R42
R80
R82
R11
R14
W656
R12
R15
R16
R17
R10
R4
R1
R5
R8
R9
R6
R7
R35
R39
R38
R23
R28
R25
R76
W683
R74
R78
R47
W684
R45
R46
W661
R27
C31
C76
C79
W651
R31
R36
W655
R83
C77
W662
R64
R65
R60
R59
R58
W652
R30
C80
R72
C71
R73
C70
C34
C33
W682
C64
R37
W680
W654
R88
R85
C86
C85
R86
R87
C74
C606
C13
EB
EB
EB
BE
EB
EB
EB
EB
EB
EB
EB
E
B
EB
IGO
18
16 9
Q54
Q138
(WH1)
(WH1)
Q137
CN7
J1
D103
D101
D126
D125
Q134
D105
Q2
WH2
CN2
WH4
WH5
WH3
Q1
D104
D102
Q17
D123
Q122
Q123
IC104
Q14
Q13
Q8
Q7
WH4
WH5
WH3
WH2
CN1
J6
J5
J4
J3
CN3
E2
E3
CN6
Q133
J7
PRE OUT
AUDIO
WOOFER
SUB
PLAY IN REC OUT PLAY IN REC OUT
VIDEO1 VIDEO2/MONITOR MD/TAPE
REC OUTPLAY IN CD/DVD PHONO
J2
X07-3142-71 A/3 (J70-1370-41)
SURROUND SPEAKERS
LR
CENTER
SPEAKER
LR
FRONT
SPEAKERS
IC113 IC101
IC102
IC114
E1
FM DET MPX
for u-COM
+5.4V AVR
CN5
D206
A1
IC201
D204
D203
D209
IC202
CN4
J8
IC602
D604
CN67 CN68
CN66
CN69
D605
D603
D602
Q601
D608CN62 CN63
CN61
CN64
X07 C/3
CN65
J61
S1
AC OUTLET
X07 B/3
ANTENNA
RED
BRN
YEL
YEL
WHT
RED
BRN
WHT
R259
R184
R183
C251
R312
R182
W174
W189
W164
W109
W86
W66
W61
W112
W84
W180
W3
W81
W7
W152
W192
W211
W187
W196
W167
W179
W168
W212
W132
W185
W150
W9
W119
W155
W130
W125
W154
W136
W19
W161
W158
W129
W101
W94
W183
W151
W33
W117
W76
W30
W184
W215
L8
W80
W56
W43
W45
W44
W35
W34
W18
W28
W46
W182
W172
W88
W118
W72
W32
W71
W60
W58
W57
W53
W29
W67
W40
W42
W74
W41
W21
W11
W12
W128
W82
W54
W173
W73
W90
W79
W78
W102
W156
W107
W17
W31
W157
W27
W37
W39
W77
W48
W5
W1
W15
W213
W139
W153
W137
W10
W6
W24
W36
W209
W203
W204
W206
W49
W50
W122
W38
W14
W16
W8
W176
W195
W52
W210
W65
W91
W93
W142
W146
W169
W145
W141
W138
W166
W115
W126
W135
W114
W87
W85
W83
W162
W68
W69
W70
W165
W171
W178
W124
W123
C239
C200
C240
C202
R319
K4
W199
C142
C145
C146
C141
C108
C103
C107
C104
C115
C116
R157
R160
K3
R158
C241
R381
R345
C114
C113
C242
C244
C243
C246
C111
C112
R113
R112
R114
R111
R108
R107
R110
R109
C137
C138
R382
C238
R207
C172
W25
R116
R115
R228
R230
R385
R229
R399
R260
R386
R383
R227
W188
R311
C252
C117
C118
K1
R322
C259
C237
W22
R235
L102
R318
R317
R181
R316
L101
C166
C153
C253 C254
W92
W55
W96
C225
C226
R232
R231
C193
.
C183
R258
C194
C184
R379
R355
R261
C209
C214
C154
C212
C189
R189
R190
R346
W104
C171
C217
W47
C264
W116
W51
C165
C155
C156
C262
R303
R304
R364
R347
R342
C257
C258
C235
R354
R306
R305
R374
C236
W194
W207
W95
W4
W2
R286
R338
K2
R263
R236
C201 C199
IC103
R348
R343
W149
W198
C190
R226
R282
C417
C415
R380
C263
W97
C261
R321
C416
W59
R349
W218 C255
C149
C150
R359
R397
C206
C221
W148
C177
C178
R398
W205
C260
C181
C182
C208
C223
R376
R193
R194
R275
R237
R238
R264
W191
W217
R208
C256
W200
W201
W13
C270
W208
W144
W62
W26
W190
W216
W20
W163
R344
L103
L105
L104
C233
R191
R192
W143
R255
C234
C231
C232
C269
1
8
1
5
IGO
GIO
6
5
2
1
1
2
5
6
2
123
22
1
2
33
32
115
EB
EB
BE
EB
EB
BE
BE
BE
EB
EB
EB
EB
BE
EB
22
1
118
1
1
14
18
ON
OFF
7.2MHz
3.6MHz
W133
W177
W127
W160
W159
W202
W110
W105
W121
W134
W140
W111
W113
W120
W106
W175
W193
W197
W181
W147
W170
W131
W89
W103
W63
15
W75
W23
W64
(W)
AM RF
(G)
T.METER
MPX.FIL.
FM
TUNED
FM IF
PLL
VT
125V
PRIMARY
F1 8A
F2
L
C17
C28
C38
C29
C37
VR1
CF1
CF2
C10
CF3
L2
R50
R44
R71
C49
C46
C72
C32
C14
C15
C67
C68
C55
L3
C62
C66
C65
L1
C73
C7
R81
C27
C16
C19
C21
C23
L6
L7
L5
C48
R41
L4
R70
R40
R77
R61
C54
C59
C53
R2
W250
C604
R604
K601
R610
R605
R606
D601
R601
T1
C602
C603
R609
R3
C605
R603
R602
W251
AC SW
T2.5A
250V
P61
C601
X2
Vref
X1
OGI
E
2121
12 3
111
2212
115
16 30
1
8
12
115
B
ACEG IBDFHJ
PC BOARD (Component side view)
1
2
3
4
5
6
7
Refer to the schematic diagram for the value of resistors and capacitors.
5
6
R49
R48
R46
R47
R53
R50
R51
R40
R41
R39
R38
R44
R45
R43
R42
R64
R61
R62
R65
R57
R52
R54
R59
R63
R58
R121
R120
R119
R109
R108
R110
R113
R112
R111
R125
R124
R122
R123
R126
R98
C13
R118
R128
C12
C18
R66
C15
C16
C2
C10
C17
C31
C22
C25
C21
C20
C28
C29
C26
C27
R29
R34
R36
R37
R31
R30
R33
R32
R8
R5
R4
R7
R12
R13 R15
R14
C52
R70
R130
R83
C33
C57
C116
C7
C108
C34
C35
R107
R501
R502
R143
R162
R127
C14
C11
R129
C39
R60
R161
C46
C61
C19
W514
W507
W509
C44
W503
C47
R142
C41
R55
W505
C42
R141
C60
C45
R114
C55
C43
C109
C110
R71
R72
R69
C48
C56
C53 C50
C36
C37
C58
C115
C113
C114
C112
C111
C59
C9
18
916
100
1
25
26
50
51
75
76
OG
I
G
OI
EB
BE
BE
BE
BE
EB
EB EB
BE BE BE
EB
EB
EB
C106
C107
R505
C451
C411
C412
C401
R454
R452
R450
C459
C460
R428
IO
R403
R401
R405
R427
G
C505
C601
C751
C752
C753
R527
R523
R514
R406
C402
R407
R402
R528
R522
R613
C507
C506
R524
R521
R404
C510
C610
R610
R612
C607
C609
R607
R609
R601
R605
C151
R66
C603
C605
R603
R611
R152
C183
R633
B
G
C453
I
O
C450
R631
R635
C621
C454
E
R20
C174
R451
C172
C175
C173
R308
R302
R306
C308
C153 C154
C163
C166
C164
C165
C171
R166
C152
R151
C151
R174
R175
C184
R165
R168
R172
R173
R169
C141
C253
R9
C56
C23
R58
C57
R7
C6
C5 R11
R12
C7
R8
R10
C42
C8
R35
C36
C55
C54
B
E
R37
C37
R33
R41
C41
C43
C35
C307
C206
C205
C306
C305
R307
R208
R207
R206
C301
C208
R304
C303
C204
R305
R303
C108
R204
C203
C202
C201
C104
R203
C207
R205
R108
L32
C31
R32
C34
C102
C101
L31
C103
R105
R103
R104
R106
C106
C105
C107
R31
R107
C33
C255
R262 R261
C256
R217
R215
R218
R216
C125
R253
C254
R258R257
C126
C251
R254
C252
Q1
Q2
Q9
Q8
Q4
Q6
Q7
Q5
Q3
Q11
Q10
D12
D16
D15
IC4
D35
D34
IC6
D36
IC3
Q12
Q14
D11
Q13
IC1
D41
IC47
D75
D76
D51
D52
D6
Q61
IC45
D61
D42
Q1
D3
POWER
X14 F/6
S6
S4
S5
S8
S11
S12
S9
S10
S13
S16
S15
S17
S7
S14
A1
IC2
D7
D4
D5
D6
D3
D2
D1
WH1
X14 C/6
X14-7122-73 A/6 (J70-1409-31)
X14 B/6
WH1
WH7
WH2
CN1
WH6
D8
S18
WH3
S2
S3
D9
E2
E1
D30
D29
D28
D27
D26
D25
D22
D18
D21
D13/W33
D20
D17
D19
E6
D24/W36
IC5
CN2
S1
CN5
D23
D33
X14 D/6
PHONES
CN3
J1
E5
CN5
IC46
IC43
IC44
IC41
E2
IC62
CN2
J75
IC42
IC61
IC51
J61
SYSTEM
CONTROL
VIDEO
IC31
Q41
Q42
Q62
D43
E7
WH6
D44
D62
IC1
E1
CN1
IC15
CN3
D151
Q15
Q16
D152
DVD/6CH.INPUT
IC2
D1
D2
IC4
A2
IC6
IC5
A3 A1
IC21
J1
IC11
IC12
DIGITAL IN
CD/DVD
DVD
VIDEO2
CENTER
SUB
WOOFER
IC14
J3
IC13
J2
FRONTSURROUND
X08-3010-11 A/3 (J70-1363-41)
WH5
S19
X1
W41
W113W116
W118
W110
W108
W107
W101
W115
W92
W16
W38
W14
W10
W37
W2
W63 W66 W67
W50
W13
W52
W48
W74
W82
W53
W64
W55
W60
W78
W68
W69
W83
W80
W75
W89
W120
W85
W97
W90
W98
W81
W111
W88
W102
W93
W95
W77W76
W79
W62
W61
W54
W105
W125
W106
W103
W127
W104
W117
W124 W123
W91
W126
W46
W40
W35
W56
W27
W17
W11
W22
W7
W32
W15
W5
W3
W39
W12
W21
W6
W44
W45
W59
W57
W65
W58
W70
W71
W72
W94
W49
W96
W128
W147
W149
W99
W145
W146
W144
W8
W100
W143
W136
W109
W119
W139
W129
W84
W112
W122
W121
W114
W47
W31
W1
W4
W24
W25
W137
W135
W140
W130
W132
W131
W133
W134
W138
W142
MODE
LISTTEN
BAND
AUTO
SOUND
MEMORY
DIMMERSET UP
INPUT MODE
MONITOR
UP
MULTI CONT.
WHT
WHT
SP.B
(MUTE)
(SP. ON/OFF)
SP.A
DOWN
SOURCE
DIRECT
DTS
DIGITAL
DOLBY
PRPLOGIC 3STEREO (DOWN MIX)
CS5.1
BLK
RED
8MHz
4.332MHz
W43
R170
CP2
CP3
C54
R2
R10
ED1
W148
C40/C49
R169
CP502
C4
CP501
R168
W87
R6
C3
C32
R22
R11
R16
R17
R9
R23
R21
R20
R19
C5
R24
C6
R25
R27
R26
R18
R167
C23
R3
R1
R35
R56
C24
CP1
C30
R87
R88
R131
R166
R164
R79
R85
W20
C51
W9
C1
C38
W141
W23
W73
R67
R86
W19
W34
W18
X2
R84
R165
W86
VOLUME CONTROL
13
1
2
8
7
STANDBY
POWER
21
20
1
2
1
2
G
I
O
7
8
1
2
1
173
1 5 15 35 51 55
G
I
O
INPUT SELECTOR
13
32
33
2
1
P1
31
C458
C59
R519
R517
18
14 8
C413
C419
R412
12
C611
C417
CP44
R431
C418
CP41
CP42
C457
R453
C452
G
C456
I
3.3V
O
6
R515
58
41
R433
C403
41
R432
R426
17
85
C455
C461
R434
CP51
C502
7
CP52
17
21
C415
C414
20
CP43
C416
916
1
C608
2
81
C602
44
40
1
R502
71
8
C501
14
148
R501
28
C508
C504
R503
39
DSP
29
C604
71
C509
C606
R56
C58
R68
22
12
R518
R310
R153
R154
R162
R163
R462
R465
B
BE
E
R464
R463
R461
R636
R634
C27
C24
AVR
10
9
R516
2
C28
5
4
R1
R632
C622
C3
C4
R2
1
1
R3
R5
C29
8
C1
C182
C181
C179
C180
C177
C167
23
22
R164
E.VOL
C169
R161
R160
C178
R4
R6
1
C2
2
R312
5
C161
R157
R158
C168
C170
22
C162
R156
R159
R155
21
8
SW
CP11
71
C188
BE
C185
C186
42
6
C187
C160
1
C156
C155
C159
R170
15
BE
2
R171
16
6ch
R255
C9
28
12.288MHz
L41
R55
R57
R42
C44
C25
C21
44
C503
R21
R520
111
R45
R59
C45
C46
R44
85
34
2333
AD/DA
C26
41
R43
C22
R36
1
R67
15
R38
R54
114
X1
R34
85
R
C212
R210
R212
R202
C304
R301
C311
R309
4
R311
5
C211
R209
R211
R201
LPF
C10
4
R112
C112
RS C309
R313
1
C310
C
R214
8
R314
16
1
C210
C209
R114
R213
LS
Config
C32
C111
R109
R110
R101
R102
4
R111
1
R259
R260
15
C110
C109
L
R113
C122
R124
C157
C158
1
30
R122
R128
5
30
8
R251
R256
1
R127
R126
R125
4
R121
R252
R123
1
C121
21
K LNPRTMOQS
PC BOARD (Component side view)
1
2
3
4
5
6
7
87
Refer to the schematic diagram for the value of resistors and capacitors.
ACEG IBDFHJ
100
R4
R2
33K
0-5P
GND4
ANT1
GND
GND3
2
1
C3
27P
L1
C1
27PC215P
C14
0.1
C5
3-7P
R1
100KR3100K
L2
C4
10P
C6
R6 33K
C7 5-10P
L3
L4
0-100
R15
10K
1.5K
C21
10P
R17
470-
C16
47P
7C9
C15
3.9K
2-6P
C17
L7
R12
C19
C208P27P
R14
10K
R16
220
R18
C8 0-6P
R7 33K
R5
1000P
L5
C10
L6
5P
C12 2P
680K-1.5M
R8
680
R9
C11
27P
0.1
C22
1-3P
100
R19
150K-
560K
C23
OSC
100P
0-100
VCC86
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
867
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
C11
47u16
C10
+
21
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 1K470P
C44
47u16
C48
+
10u16
C46
+
1000P
2.2u50
+
0.022
R531K
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
0.01C5R11
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
D211
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
1
2
3
4
5
6
7
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list). indicates safety critical components. 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.
The DC voltage is an actual reading measured with a high impedance type voltmeter 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 instruments used or on the product. The value shown in ( ) is actual reading measured
in the AM mode.
MODE CARRIER
FREQUENCY DEVIATION
MODULATION
ANT INPUT
FM 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot) 60dB
AM 1000(999)kHz 400Hz MONO 30% MOD 60dB
KRF-V4550D/V4550DE/V4550D-S
Y05-4332-70
1
CD
Lch 1
Rch 2
Lch 3
PHONO
(AUDIO)
J3
Rch 4
Lch 7
Rch 8
Rch 6
Lch 5
MD/TAPE
REC
MD/TAPE
PLAY
Rch 8
Rch 6
Lch 7
Lch 5
Rch 4
Lch 3
Lch 1
Rch 2
J4
REC
MONITOR
MONITOR
PLAY
IN
VIDEO1
OUT
VIDEO1
CN3 CN6 CN7CN2
(BOTTOM VIEW)
(BOTTOM VIEW)
INPUT/REC
SELECTOR
OUT
INPUT/
SELECTOR
ATT
D118
D117
D108
D106
Q137
Q134
Q133
Q132
Q136
Q135
Q138
D107
+B AVR
-B AVR
PAC K
CONT.
IC105(2/2)
IC105(1/2)
PHONO
EQ AMP
IC108(2/2)
IC108(1/2)
IC107(2/2)
IC107(1/2)
LINE BUFFER
REC OUT BUFFER
IC110(1/2)
IC110(2/2)
Q1
Q5
Q6
Q2
Q11
Q8
IC111(2/2)
Q12
Q7
IC111(1/2)
Q14
IC112(2/2)
Q13
Q17
Q16
IC112(1/2)
Q52
Q51
20dB ATT
CONT.
PRE OUT
CONT.
Q53
D1
D110 D109
(MAIN OUT)
MUTING
(LS,RSch)
POWER AMP
LSch
LSch
RSch
Lch
RSch
Rch
Cch
SWch
Cch
SWch
Rch
20dB AMP
20dB ATT
1/4
X07-B/3
-CN5
D
E
IC106
IC109
IC101
(X07-3142-71) (A/3)
A
58.4V
-58.4V
58.0V
58.4V
56.0V
56.2V
-56.7V
-56.2V
-58.4V
11.8V
-11.8V
-11.8V
11.8V
11.8V
-11.8V
-11.8V
11.8V
OFF : 4.6V
ON : 1.6V
-29.7V
8.0V
5.4V
8.0V
-11.8V
220K
220P
R120
C120 C119
220P
220K
R119
LINE: 200mV
MM: 2.5V
1K
R117
R118
1K
220K220K220K 220K
1K
1K
C123C124
R127
220P
R126
220P
R128
R125
C122 C121
220P
R122
220P
R124
R121
1K
R123
C101C102
39P39P
R1011K10u35
+
C103
R1021K10u35
+
C104
1K
C130 C129
R139
220K
220P
R138
220P
1K
R140
220K
R137
1K
C125C126
R130
220P
R132
220K
R129
220P
1K
R131
220K
C127C128
R134
1K
220P
R136
220K
R133
220P
1K
R135
220K
C131C132
R142
1K
220P
R144
220K
220P
1K
R143
220K
1K
R141
12345 67891011121314151617181920212223
M VDD
M GND
+VDD
-VSS
A GND
R
RS
SW
C
LS
L
GND
R AUX
GND
L AUX
GND
L REC
L DVD
LT
GND
RT
R DVD
R REC
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
DET.
S.LEVEL
SD
STEREO
Rch
GND
Lch
+12V
-12V
T MUTE
PLL DATA
PLL CLK
PLL C.E.
PLL DO
CH SPACE
33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
D GND
5.0V
-30V
F.OFF
POWER RE.
SD
STEREO
DET OUT
T.MUTE
PLL CE
S.LEVEL/CH.SPACE
PLL DO
SEL./PLL.DT
SEL./PLL.CK
SEL ST2
SEL ST1
H.P R
H.P L
F.OFF2
A.MUTE
20dB ATT
PRE OUT MUTE
F.A RE.
F.B RE.
CENTER RE.
REAR RE.
LIMITER
PACK CONT.
THERMAL SENS.
PROTECTION2
PROTECTION
10.8V
GND(X08)
54321
X08+B
+5.0V
D GND
F.OFF
POWER RE
1234567891011
12
13
14
VSS
ST
GND
282726
252423
22
21
201918
17
16
15
VDD
DATA
CLK
N.C. N.C.
TUNER
PHONO
CD
TAPE/MD
COM
REC OUT
TAPE/MD
VIDEO1
ANALOG
DIGITAL
REC OUT
REC OUT
REC OUT
L/R
L/R
R
L
CLK GND
COM
27
VDD
28
L
R
FRONT
26
252423
VIDEO3
VIDEO2
VIDEO1
18
LINE BUF
COM
22
21
20
19
MONITOR
ATT1
ATT OFF
17
N.C.
DATA
16
15
ATT2
2
1
VSS
436
5
11
87109121413
ST
N.C.
AUX
-VL
+VL
+VH
1
2
+REF
-REF
4
3
5
-VH
LS OUT
SUB
7
6
8
-RE/CH2
-RE/CH1
10
9
R183 0.22
R181 0.22
R184 0.22
2W
2W
2W
R199
33K
R281
1
R310
R309
1
3.9K 1W
R304
3.9K 1W
R303
30K
R201
2200P
C159
30K
R202
2200P
C160
47
R392
47
R39147R393
47
R394
10u100
C251
+
47K
R314 47K
R313
10K
10K
R311
10u100
C252
+
10
R312
C260 220u6.3
+
R389 4.7K
47
R321
10K
R320
68K
R319
47K
R387
47K
R388
100u10
+
C259
1/4W
1/4W
R390
47K
R323 39K
7
6
6
5
4
7
4.7u35
+
C116
3
2
8
1
C105 220P
R103 27K
270K
R109
360
R107
47u6.3
C107
+
0.012
C111
470P
C109
22K
R111
C117 100P
3300P
C113
R113 47K
100P
C241
100
R116
4.7u35
+
C115
R105
100
R110
270K
R112
22K
0.012
C112 C114
C108
47u6.3
+
R108
360
C110
470P
100
R106
220P
27K
R114 47K
C118 100P
3300P
R115
100
C242 0.01
4
3
2
1
6
5
7
8
2
3
4
1
5
6
8
7
220K
R155
C143 100P
C139
220K
R153
C140 100P
220K
R154
2.2u50
+
C138
220K
R156
C144 100P
2.2u50
+
C142
22u16
+
C146
2.2u50
+
C137
2.2u50
C141
22u16
+
C145
+
1K
R381
C245
1000P
C106
R104
220P
C250
1K
R384
220P
C248
0.01
C246
R160
100
R158
R164 6.8K
R162 3KR161 3K
R163 6.8K
R385 1K
R386 1K
R159 5.6K
19
18
15
13
22
17
100P
1K
R376
1K
R375
5
6
8
7
10P
C151
18K
R171
10u50
+
C153
47u25
+
C149
220K
R169
1.8K
R167
10K
R355
4
3
2
1
R173
2.2K
10P
C152
R172
18K
47u25
C150
+
R168
1.8K
R170
220K
R356
10K
C147 470P
R165 18KR166 18K
C148 470P
10u50
+
C154
C176 470P
R358
R212 27K
10K
C175 470P
R211 27K
R357
10K
10P
2.2K
2
3
10u50
+
1
4
R214
1.8K
+
C178
47u25
220K
R216
10P
C18218K
R218
C180
1K
R378
10u50
7
+
R215
220K
R213
1.8K
6
C177
47u25
C179
18K
+
R217
5
C181
8
1K
R377
R219
C220 470P
R275
10u50
2
3
+
1
4
1.2K
R271 18K
R360
10K
C205 470P
R251 18K
R359
10K
7
10u50
10P
R272
240
C221
100u10
+
R273
3.3K
C223
R274
18K
C222
100P
+
R253
220K
R252
1.8K
C206
6
47u25
C207
18K
R254
+
R379
1K
R379
1K
R255
5
C208
8
1K
R353
R351 10K
C415 1u50
+
R352 22K
R354 10K
R361 47K
R362 47K
R363
360
R364 10K
10u25
C416
C417 10u25
R371 56K
R372 100K
R373
360
R374 10K
820 1/4W
R380
14
12
13
3
6
12
13
2
6
13
12
3
2
4
5
13
12
14
19
18
3
4
6
7
9
10
11
8
15
100K
R284
23
22
21
11
13
17
18
15
21
4
5
LS
RS
L
R
C
SW
R341
1 1/4W
Q5,6,11,12,17
R382 1K
R383 1K
R157 100
REC OUT
5.6K
18
23
11
IC110-112
IC1,2,7,8,13,14
1 1/4W
30V30V
30V
2.2K
R174
2.2K
R220
2.2K
R322
+12V
+12V
+B
12V
12V
+12V
12V
+B
+12V
12V
+12V
+B
+5V
+B
+12V
12V
+B
B
B
+12V
+B
+12V
12V
12V
12V
+12V
12V
+12V +12V
12V
B
B
B
+12V
+12V
12V
+B
+B
+B +B
+B
+12V
+B
+B
B
B
W339
W182
2
3
4
5
6
K LNPRTMOQS
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to
parts list). indicates safety critical components. For continued protection against risk of fire, replace only with same
The DC voltage is an actual reading measured with a high impedance type voltmeter with no signal input.
The measurement value may vary depending on the measuring instruments used or on the product.
type and rating fuse(s). To reduce the risk of electric shock, leakage-current or resistance measurements shall be carried
7
out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
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