A
B
C
1
2
3
4
5
g
m
Pickup
VA, VB , VC, VE
VF, MD, LD
CN501
IC521
RF AMP
FEED
SPINDLE
FOCUS
TRACKING
LOADING
IC501
BTL
DRIVER
SEL,TEB
RF,RFRP
FE,SBAD
TE,RFGO
LM0, LM1
IC541
DSP & DAC
BUS0~3, BUCK
CCE, RST
L-CH
R-CH
IC581
CD LPF
CD_L
CD_R
IC161
E.VOLUME
L-CH
R-CH
TU1
TUNER PACK
OUTFL, OUTFR
OUTRL, OUTRR
J1
IC301
POWER AMP.
KD-S723R/KD-S721R
Block dia
ra
CP961
KEY MATRIX
S601~S620
KEY0~2
IC601
LCD
DRIVER
LCD_CE
LCD_CL
LCD_DA
COM1~3
S1~S48
LCD1
REST, SW1~4
CJ601
KEY0~2
LCD_CE
CP601
LCD_CLK
LCD_SO
IC701
CPU
2-1
MUX
RDSDA
RDSSCK
IC71
RDS
DETECTER
REAR L
REAR R
LINE OUTPUT
KD-S723R/KD-S721R
< MEMO >
2-2
Standard schematic diagrams
3
Receiver & System control section
TU1
QAU0222-001
9V
CD.R
CD.L
REST
SW1
SW2
SW3
SW4
LM0
LM1
BUS0
BUS1
BUS2
BUS3
BUCK
CCE
RST
CD8V
CP601
VMC0334-001
J1
QNB0100-002
C31
R31
2.2/50
1k
C32
0.001
Q31
2SD601A
R33
1.5k
R43
R41
C41
0.033
3.3k
C42
0.0082
Q41
2SD601A
GND
DETACH
ILL10V
ACC5V
REMOCON
LCDCL
LCDDA
LCDCE
KEY0
KEY1
KEY2
D706
CH.L
GND
SI
CONT+B
CH.R
MEM-IN
J801
QNZ0095-001
L1
4.7u
D1
C1
5P
R2
R3
R32
10k
Q32
2SD601A
1k
R42
1k
C43
100/16
Q42
2SC3661
D705
100k
C801
0.01
R803
D2
1SS133
1SS133
C2
C4
220P
1k
1k
C44
0.01
D704
R801
100k
R802
100k
R810
100
10p
C5
C6
0.047
0.47/50
Q43
UN2211
MONO
IFC
SD/ST
OSC
AMEO
FMEO
Q7
UN2211
R44
33
FM/AM
D41
MA3110
SQ
R51
470
C51
0.47/50
C720
C719
0.1
0.1
D707
10k
R804
IC801
HD74HC126FP-X
4.7k
R7
R52
15k
2SD601A
R53
10k
D703
R1
0
C7
100p
C10
0.001
Q5
2SB815
R8
47k
R54
10k
Q52
C53
Q51
2SD601A
0.1
R55
2.2k
C52
4700p
D702
D701
100k
R808
22k
R806R807
R805
100
100k
100k
C802
0.047
R809
UN2211
KD-S723R/KD-S721R
C77
R167
1SS355-X
R730
100K
R725
100K
R726
R727
R728
R729
0.022
10k
10k
22k
R168
R170
B174
0
D161
2.2k
R71
2.2k
R72
PS2
47k
47K
47k
47k
2SD601A
Q181
4.7k
IC71
SAA6579T-X
9V
C718
DETACH
10K
R738
UN2111
0.01
Q174
R731
ACC5V
100K
4.7k
R711
SISOSCK
C191R187
1/50
C171
1/50
22k
R188
C173
0.1
Q162
UN2111
C75
560P
C76
2.2/50
2.2k
R73
1SS133
D241
220K
0.015
R241
C241
RST
BUS1
BUS3
BUS0
BUS2
4.7k
4.7k
R710
R709
SDA
R244
C242
12k
0.047
1SS133
R243
100
2SD601A
1k
D242
Q241
R242
C243
22/16
LM0
LM1
CCE
BUCK
2.2K
R745
R744
2.2K
LM1
4.7k
2.2k
R704
R703
2.2k
R712
I/O
SCL
LCDDA
LCDCL
R161
220k
C161
2.2k
SW2
1SS355-X
180k
R245
C244
1/50
22k
SW3
D162
R181
220k
47k
R247
R164 R184
3.3K 3.3K
R746
SW4
REST
1/50
C911
47/10
D182
1SS355-X
47K
R732
SDA
47k
R718
10k
KEY0
CH.L
CD.L
CD.R
CH.R
9V
R246
LM0
R705
LCDCE
2.2k
R163
R162
22k
C162
0.0082
C164
0.22/50
1/50
C181
C182
C912
100/10
47K
R733
SCL
TEL_MUTE
R747
47k
R717
R716
10k
10k
10k
R715
KEY1
KEY2
LEVEL
C166
C163
0.0056
0.15
C165
0.033
C184
0.22/50
0.033
C185
C183
0.15
0.0082
C186
0.0056
10
R911
R183
22k
R182
C913
2.2k
100/16
PS2
SW1
R743R742
R723
100k
REMOCON
4.7k
R724
R701
1k
R702
1.2k
47k
R750
RESET
100/6.3
R722
0
QAX0406-002Z
10k
10k
R714
R713
4.7k
R721
4.7k
R720
4.7k
R719
SM
SQ
C168
4.7/50
C167
4.7/50
47k47k
47k
R165R185
Q781
UN2111
47k
R891
UPD178078GF-540
D782
1SS133
1SS355-X
Q891
UN2211
R166
47k
R186
27k
R781
1K
R782
Q782
UN2211
C783
0.082
Q976
UN2211
R902
0
D781
1k
R892
1SS355-X
D891
C891
0.047
IC701
C902
C901
C781
220/6.3
220/10
0.1
Q901
2SB709A
1SS355-X
D892
R901
2.2K
2SB709A
C903
22/16
R332
820
R322
820
1SS355-X
R323
D321
2.2k
D331
1SS355-X
R333
2.2k
IC961
HA13164A
Q977
R901
0
C915
10/16
R902
47k
Q902
UN2213
D784
UDZ11B-X
D901
1SS355-X
2SD104B
Q321
2SD104B
Q331
100
R324
Q783
UN2111
R978
C782
22/16
12K
33K
R977
R904
4.7k
10/16
C905
C904
220/10
R342
R352
1SS355-X
D351
D341
1SS355-X
100
R334
C907
2.2/50
10/16
C906
4.7k 10k
R905 R906
IC161
TEA6320T-X
C188
4.7/50
C187
4.7/50
C933
0.01
C712
68p
L701
4.7u
47k47k
C706
C704
0.1
R708
47k
R707
47k
CD8V
ILL10V
C708
CONT+B
100/6.3
ACC5V
C707
0.01
VPP
R737
47k
R740
47k
X1
X701
S701
R753
100
TEL_MUTE
FMEO
AMEO
C776
C713
0.01
470p
OSC
IFC
R739
47k
SD/ST
C701
22p
C702
22p
C703
0.1
MEM-IN
C709
0.01
IC301
LA4743K
R353
2.2k
47( 1/4W)
0.047
C351
2.2/50
2.2/50
C331
C914
4.7/25
390P
390P
0.022
C317
100
R344
J301
QNN0175-001
C313
47/16
C393
C310
10/16
0.1
C394
0.1
D911
1N5401-TU
C908
2200/16
L961
QQR0703-001
D912
C909
0.1
CRS03-W
QMFZ047-150-T
CP961
QNZ0112-001
0.022
C316
C315
100/16
22/16
C309
C392
0.1
C391
0.1
CRS03
D994
D993
CRS03
D992
CRS03
D991
CRS03
CRS03
D997
CRS03
D998
D995
CRS03
CRS03
D996
100p
C304
100p
C303
100p
C302
100p
C301
100p
C307
100p
C308
100p
C305
100p
C306
QAM0158-001
C332
C352
390P
390P
C341
2.2/50
C342
C322
C321
2.2/50
R310
4.7k
Q351
2SD1048
100
R354
R907
D910
CRS03-W
C312
C311
0.047
R351
27k
R331
27k
R341
27k
R321
27k
1k
1k
R343
2.2k
Q341
2SD1048
Parts are safety assurance parts.
When replacing those parts make
sure to use the specified one.
Tuner signal
CD signal
Front signal
Rear signal
COMP.OUT
1/50
C189
1/50
C169
C192
220/10
8.2( 1/8W)
9V
Q2
C3
2SD601A
0.1/50
0.018
SK/STP
Q161
2SD601A
R5
4.7k
4.7k
R169
Q3
UN2111
C74
47/10
C73
0.01
C72
47P
X71
QAX0263-001
C71
82P
AFCK
LEVEL
SK/STP
R706
10K
C721
0.1
VDD
C770
0.01
VSS
UN2211
Q1
0.018
C172
C8
0.01
R4
22k
Q4
2SB709A
D3
D4
1SS355-X
R9
3.3k
Q751
R56
47k
C54
0.01
C55
330p
47k
R57
MONO
SEEK/STP
FM/AM
AFCK
SI
SO
I/O
SCK
C9
R6
47k
0
*B51
1SS355-X
R10
R751
10k
R58
47k
Q53
UN2211
SM
SEEK/STP
2-
Mecha control circuit section
KD-S723R/KD-S721RKD-S723R/KD-S721R
LD
VCC
SW4
VF
SW3
VB
SW1
VA
SW2
VE
GND
VC
LOADING-
LOADING+
MD
REST
VREF
SPINDLE+
FOCUSÂSPINDLE-
FOCUS+
FEED+
TRACKING+
FEED-
TRACKING-
QGB2027M1-26S
R508
LM0
LM1
R504
20k
LD
VCC
SW4
VF
SW3
VB
SW1
VA
SW2
VE
VC
LOADING-
LOADING+
MD
REST
VREF
SPINDLE+
FOCUS-
SPINDLE-
FOCUS+
FEED+
TRACKING+
FEED-
CN501
TRACKING-
VREF
C521
0.01
VCC
C522
0.01
R521
VC
R522
VA
R523
VB
R524
VE
R525
VF
R526
MD
LD
LOADING+
LOADING-
TRACKING-
TRACKING+
FOCUS-
FOCUS+
R533
56p
C533
47k
47k
47k
47k
100k
100k
6.8k
R532 R531
R534
15k 2.2k
47k
C523
0.01
C524
100/6.3
FO
SP
0.01
220/10
R501
8.2k
C501
C502
IC501
LA6567
SPINDLE+
SPINDLE-
FEED+
FEED-
FD
RF
RFGC
RFRP
TP1
RF
0.1
0.1
C531
C532
SEL
C526
100/6.3
R528
C525
0.01
Q521
2SB1322
R527
Q501
C503
2SB1322
22/16
R502
5.6k
R503
2.4k
FE
SBAD
TP2
VREF
0.01
C529
C530
100/6.3
47k
R530
IC521
TA2109F
27k
100p
C527
100/6.3
C528
R529
TEB
TE
22
22
20k
R507
8.2k
D501
DSK10C
D502
R506
DSK10C
0
C569
C567
C568
C570
L541
4.7u
100
R558
C571
100/6.3
C572
C573
L542
4.7u
4.7k
4.7k
4.7k
4.7k
R545
R541
R542
R543
R544
10k
100/6.3
C541
0.01
C542
100p
100/6.3
GND
100/6.3
R-CH
0.01
L-CH
BUCK
BUS0
CCE
BUS1
BUS2
BUS3
RST
C543
1/50
C565
10p
10p
0.01
0.01
X541 C566
QAX0413-001
R581
R-CH
24K
R591
L-CH
24K
C564
C563
C545
0.01
C544
100/6.3
4.7/25
C582
C581
820P
C591
820P
0.01
100/6.3
22K22K
22K22K
R582R583
R592R593
C583
C593
47/6.3
47/6.3
4.7/25
C592
C562
C561
SEL
TEB
C560
6.8k
3.3k
1.5k
R555
R556
R557
R549
R548
R546 R547
10k 47k
C546
100/6.3
R584
R585
12K
R595
33K
R594
0.047
0.047
0.047
C559
0.047
R554
3.3k
15k
R553
1.5k
R552
C555
R551
0.01
C552
2700p
C551
0.01
C550
R550
C548
33k
0.015
IC541
470k
TC9462F
68k
47p
C547
R586
33K
1.5K
12K
C584
120P
IC581
NJM4565M
C595
100/10
C594
120P
R596
1.5K
RFGC
C558
C557
560p
100/6.3
C556
3300p
0.033
10k
TE
SBAD
FE
RFRP
C554
0.01
C553
100/6.3
RF
C549
100/6.3
9V
CD.R
GND
CD.L
REST
SW1
SW2
SW3
SW4
LM0
LM1
BUS0
BUS1
BUS2
BUS3
BUCK
CCE
RST
CD8V
GND
Digital signal
Analog signal
-
LCD driver & Operation switch section
A
5
LCD1
QLD0210-002
S2
S1
S3S4S5
S6
KD-S723R/KD-S721R
IC602
RPM6938-SV4
C611
0.012
UDZS5.1B-X
D644
10k
S7
S8
S9
S10
S11
S17
S18
S19
S16
S12
S13
S14
S20
S15
S21
S25
S22
S28
S24
S27
S26
S23
S29
S31
S30
S32
S33
S36
S35
S38
S34
S37
S44
S39
S45
S40
S46
S43
S47
S42
S41
S48
COM3
COM1
COM2
R661
C612
4.7/6.3
R662
470
VMC0335-001
ILL10V
ACC5V
REMOCON
CJ601
3.9K 2.7K 1.8K 1.2K
R616
R615
S618S619
R617
3.9K 1.2K 8201.8K2.7K
S620
820
1.2K1.8K2.7K
S603
820
S609S610S611S612S613
R614 R613
S602S604S605S606
S608
BUS3
IC601
LC75823W
R601R602R603R604R605
820
R606R607R611 R610 R609 R608
820
R612
S615S616S617
KEY0
S601
KEY1
S607
KEY2
820
S614
820
R645
D601
D602
820
R644
510
R643
D603
D604
D605
510
R642
220
R641
D606
D607
D608
D609
220
R640
220
R639
D610
D611
D612
D614
220
R638
1.5k
R637
D613
1.5k
R636
510
R635
D615
D616
D617
510
R634
2.2k
R651
2.2k
LCDCE
LCDCL
LCDDA
10/6.3
C603
R652
R653
R654
R655
R656
D642
D643
R658
10k
10k
10k
10k
1SS355-X
1SS355-X
180k
D641
UDZS5.1B-X
C601
0.022
680P
C602
51k
R657
SML-310LT/MN/-X
D618
D620
D619
820
R633
820
R632
820
R631
PL601
D645
UDZS5.1B-X
PL602
BUS1
BUS2
LCDCL
LCDDA
LCDCE
KEY0
KEY1
KEY2
GND
2-
6
Printed circuit boards
KD-S723R/KD-S721RKD-S723R/KD-S721R
Main board(Forward side)
CP961
IC301
C309
C550
C551
C552
C555
R552
R553
C557
C556
C301
J302
C530
R551
C391
C322
C310
C527
Q521
C392 C393 C394
C302
D991
D992
D993
C332
C342
C317
C914
R527
R528
C525
12
13
IC521
R547
C547
R530
R546
R548
R550
C548
R549
C549
C553
C558
D994
R310
C891
C304
C303
C305
C307
C308
C306
C316
D995
D996
C352
Q782
R782
R781
C782
C526
R526
1
C523
R534
C544
24
C546
30
31
.
.
.
50
..
51
R554
C559
C560
R555
C563
D997
D782
IC541
C341
D998
Q783
CN501
C524
C545
.
C783
C543
D891
Q891
D892
C331
C321
Q977
Q781
D781
C781
Q501
R502
R545
1
....
.
.
.
80
C503
R504
C569
R892
R977
R503
15
Main board(Reverse side)
R331
R246
R907
R583
IC961
R906
R247
R592
D501
R582
D711
C903
C501
C583
D911
C593
R593
R905
C908
C582
D502
C907
L961
C714
C572
C592
C502
R506
C909
D912
TEL-MUTE
B310
B314
B313
B315B316
C351
C321
C781
C521
26
25
R501
Q501
C503
L541
R558
C570
C568
C543
C542
B324
C569
C565
L542
C541
C573
C571
C567
X541
C566
S701
SW5VMEM.DET
ACC.IN
ANTCTRL
C901
C187
LM0
MEM.IN
R243
R801
C167
ACC.5V
R242
C595
VDD.5V
D901
C244
REMOTE
NC
R321
R341
C915
C904
R351
CTRL
AJ
R726
R727
B904
C933
B732
B318
R164
D241
R166
GND
ILM.10V
A.9V
J801
CD.8V
C905
C902
B903
C188
C168
C243
D242
L701
LM1
VDD
R728
R729
R721
R719
VSS
IC801
T1B
J301
C311
IC961
R904
C903
D501
R542
R541
C501
R586
R245
C244
R805
C167
C904
R594
R595
C594
C802
C915
R809
R807
R806
R244
Q241
R808
R706
C901
C595
R725
R730
R738
R596
C187
D242
R731
R804
R802
R745
C243
R744
L701
R803
R810
IC701
C770
R711
C905
C188
C168
C242
100
R710
R709
GEB10007A
81
S1B
J801
IC161
D241
80
.
.
.
.
.....
1
R704
R703
R712
R705
D910
L961
D911
C351
C907
R907
C908
R902
R901
Q976
D502
1
28
B501
R507
L542
R508
R544
R543
C593
C541
C592
C591
R581
IC581
C584
R585
C581
R584
C582
C583
X541
C572
S701
R891
R978
IC501
14
L541
100
.
.
R591
.
81
C571
C913
.
R746
R747
Q321
R323
C184
32
1
C165
C164
B731
R742
R743
R723
.
.
.
30
R717
R716
R718
D161
B706
D162
31
R707
51
D321
X701
CP601
50
Q162
Q331
R343
R333
D331
C912
C181
C911
C9
17
B52
16
C31
R43
C161
Q32
C171
D182
R33
R168
C706
Q161
B733
C191
.
.
C704
.
C703
R169
R739
R170
Q52
R51
C10
R713
C53
C51
R55
R708
C3
R5
C52
C708
Q2
Q3
J301
Q351
Q341
R353
D351
D341
L1
C42
C43
D41
R32
C760
Q5
R8
C169
C189
R188
Q181
R53
Q51
C54
R57
R4
C55
R714
C74
X71
J1
D1
D2
C5
TU1
C76
IC71
D1
D2
FMVT
AMVCC
FM/AMOSC
FMVCC
Q4
R6
L-CH
C5
R-CH
Q751
SEEK/STOP
S.METER
C77
COMP.OUT
MUTE
TU1
AMVT
R751
J1
C1
C4
C44
C172
C192
C8
AMANT
FMANT
C2
C7
SD/ST
VCC
C76
L1
NC
NC
R2
Q43
C6
GND
VCC
GND
GND
NC
SNC
R7
C75
R73
C312
R334
R182
C706
R753
R52
REMO
D707
C162
C912
R44
C3
R332
C183
R162
RESET
ENC.1
R686
R740
R322
R183
VPP
X1
ENC.2
R685
CP601
NC
C186
X701
C163
R324
C801
R185
C184
R165
R186
C913
R911
C185
C718
B317
R163
C166
C241
R241
R161
D701
R733
R184
R732
R702
R701
R724
R715
SI
SCK
R736
SO
R734
R720
D706
D705
C721
KEY0
D704
GND
CE
KEY1
KEY2
D703
D702
R750
R737
C776
R722
C701
C702
NC
DATA
SCK
D709
D708
R354
R342
R352
R344
B901
C911
C181
C182
C41
R41
C9
R181
R10
Q41
C43
R42
Q42
C31
R31
C32
R3
R1
D4
D3
C169
C189
R58
Q53
Q7
R72
C73
C72
X71
C71
C720
C164
Q31
C161
C171
R9
C713
R167
C191
C173
B174
Q174
R187
R56
C51
R54
C708
B51
C707
Q1
C74
D710
R71
DET.
5V
10V
C719
B309
C331
C563
B308
C526
B305
B306
B307
CP961
C546
R557
R556
R524
R533
GND
ACCREM
C309
VREF
C310
C529
TP2
RF
23
IC301
TP1
C527
C530
C313
J302
1
C315
B302
B303
C316
C317
C914
C522
2
1
CN501
C528
R525
R529
C533
C531
Q521
C532
C549
C553
C554
C558
C561
C562
MEM
C341
D782
C782
D784
R521R522
C524
R523
R532
C544
R531
C564
Front board(Forward side)
D620
S601
S604
D603
D601
S603
R601
S602
D602
S1A
R603
R602
D605
R605
GEB10036A
R604
D604
S607
R606
PL602
S605
IC602
LCD1
3
D606
2
S606
1
S608
D607
R607
D608
S609
D609
R608 R609
S610
S619
D614
S612
D615
R611
R610
S620
R638
R639
,
R637
R636
PL601
R613
D613
S616
D610
S611
D611
S614
R612
D612
S615
R615
D617
D616
R616
R617
D618
R614
S613
S617
D619
S618
2-
Front board(Reverse side)
C603
R658
D643
D642
C601
D641
CJ601
R657
C602
R652
R651
2
1
PL601
R654
R655
R656
R653
D645
GEB10036A
R632
R634
R633
R635
32
33
48
14
15
49
64
IC601
17
16
1
PL602
IC602
T1A
R641
R640
R631
R645
C612
C611
R644
R643
R642
R662
3
R661
2
D644
1
H
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