SA SA AK48 Service Manual

SA-AK48

15.2. Schematic Diagram

-

SCHEMATIC DIAGRAM

NOTE:
The number which noted atthe connectors on the schematicdiagram as
"SCHEMATICDIAGRAM-1" or "SCHEMATIC DIAGRAM-2"
indicates the schematic diagram serialnumber located on the leftcorner in the schematic diagram.

1

OPTICAL PICKUP

0.1

8

3

LD

11

12

2

10

5

4

9

6

1 2 3 4

Vcc

BIN

GND

NBOUT

GND

NAOUT

8 7 6 5

AIN

VREF

CD SERVO CIRCUIT

A

4.7

R701

Q701
2SA1037AKSTX

1

2

3

4

5

6

7

8

9

10

11

1212

13

14

15

1616

CN701

D

LASER POWER
DRIVE

C751

0.1

CB A

A

B

C

D

E

C750

0.1

Vcc

1K

680P

680P

0.047

1

PDF

2

PDE

3

LD

4

GND

5

GND

6

NB

7

GND

8

NA

9

VREF

10

LPD

11

GND

T+

13

-

T

14

F+

15

-

F

(3V)

3.2V

1.1V
(2V)

D
E

C
A
B

C712

0.1

C711

0.1

TP42 TP40

C701

6.3V33

(2.3V)

2.7V

1.6V 3.3V1.6V 1.6V 1.6V

Vcc

PDF

PDE

FBAL

TBAL

VREF

1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 0V 3.2V

2200P

22K

39K

R708

R707

HGFEDC

I

:POSITIVE VOLTAGELINE :CD PLAYBACK SIGNAL LINE

5V

3.3V

3.3V

IC701
AN8839NSBE2

SERVOAMP

PDA

PDB

FEN

FEOUT

C747
180P

R744
120K

C749

1K

R706

PLAY

0.5*s.0.2V/DIV.

(0.2V)0V(2.3V)

LPD

TEOUT

C710
120P

10K

150K

R702

R705

1K

R704

TP33 TP32

(RF)

0.8V
P-P

TJ701

0.1

C706

C702

2700P

(1.4V)

2.7V

0.9V 0.7V 1.9V 1.6V 0V

LD

RF

RFIN

TEN

NC

NC

PLAY

0.3V
P-P

2ms. 0.1V/DIV.

TP29

C707

CSBRT

ENV

0.027

C742

0.027

CEA

NC

C704

0.1

BDO

OFTR

C703

6.3V100

C716
820P

(3.2V)

0V

LDON

PDOWN

1413121110987654321

GND

/RFDET

1516171819202122232425262728

(0V)

5V

B

A

M702
SPINDLE
MOTOR

M701
TRAVERSE
MOTOR

TRACKING
COIL

FOCUS
COIL

M

M

TP36

C737

TP35
TP38

C736

TP37

0.1

VREF

0.1

C713

C714

6.3V100

IC703
AN8739SBE2

FOCUS COIL/

C734

PGND2

PGND1

10V220

C735

TRACKING COIL/
TRAVERSEMOTOR/
SPINDLE MOTOR DRIVE

NC

GND

PVcc2

NC

GND

PVcc1

7.5V

R723

0.1

BADC

(0.4V) (0.6V)

0V 0V 0V 0V 0V 7.5V 7.5V 1.6V 1.6V 1.6V

14 15 16 17 18 19 20

­D3

D2+

13 12 11 10 9 8 7

A

0.1

B

C

0.1
D

0V 0V 0V 0V

(0.1V) (0.7V) (0.7V)

AB CD

D3+

­D2

­D4

D1+

D4+

­D1

NC

NC

PLAY

0.1V

BA

IN4

PC2

(0V)

100

R724

R735

18K

P-P

IN3

IN2

R725

390

R715

1K

RSTIN

NC

1.6V1.6V3.2V1.6V1.6V

C715

2700P

C738

2ms. 0.1V/DIV.

100

R736

21 22 23 24 25 26

Vcc

VREF

NC

IN1

6 5 4 3 2 1

6.8K

7.7V

7.4V

0.01

NC

/RST

C752

1000P

A

3.9K

3.9K

R729

R727

R749 4.7K

R731 6.8K

B

A

R728

C739

1500P

3.9K
B

C
D
E
F
G

40

SCHEMATIC DIAGRAM-2

:POSITIVE VOLTAGELINE :CD PLAYBACK SIGNAL LINE

0.1

C723

C724

10V220

3.2V

6.3V220

C730

0.1

C731

C754

470P

R721

100

PLAY

1kHz, 0dB

R717

1K

2.2V
P-P

R718

1K

3.3V

3.3V

C725

C726

1000P

1000P

C727
50V1

C728
50V1

TP23

TP21

C732

6.3V220

C733

SA-AK48

TP20TP18

A

B

0.1

R711

C717

82K

0.1

F=16.9344MHz

C722

10P

C721

10P

C718

0.22

R709

68K

X701

(16.9344MHz)

0

R714

R712

220

R741 47K

C744

8200P

2.1V
P-P

R742
220K

3.2V

1.6V

1.6V

3.2V

(1.2V)

0V

1.6V

1.6V
1V

1.6V

1.5V

PLAY

2ms. 0.1V/DIV.

3.2V3V1.5V

CRC

DEMPH

0.8V
P-P

T 13.3ms.

0.8V
P-P

TE

RFENV

1.6V

1.6V

1.6V

RESY

PLAY

FE

1.6V

3.2V

IOSEL

TBAL

1.6V

/TEST

FBAL

61

62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

CLVS

FCLK

FLAG

BYTCK

DD

V

60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41

X2 OUT
X1 IN
Vss
SBCK
SUBC
VCOF2
PCK
EFM
AVss2
AV
VCOF
PLLF
DSLF
DRF
IREF
ARF
WVEL
DSLF2
PLLF2

0.3V
P-P

DD

IPFLAG

/CLDCK

F=16.9344MHz

IC702
MN662790RSC

2

SERVO PROCESSOR/
DIGITALSIGNALPROCESSOR/
DIGITALFILTER/
D/A CONVERTER

PLAY

0.5 s. 0.2V/DIV.

VDET

OFT

TRCRS

/RFDET

BDO

LDON

0V(3.2V)

0V

0V

3.2V(0V)

1

DD

OUTL

AVss1

AV

PLAY

T 13.3ms.

3.2V

0V

PLAY

F=75Hz

TRD

FOD

VREF

1.6V

1.6V

1.6V

1.5V

OUTR

KICK

3V

3.2V

0V

1.6V

3.2V

RSEL

ECS

1.6V

DD

IOV

3.2V

ECM

0V

3.2V(0V)

PSEL

PC

1.6V

GFEDCBAABCDEFGHI

3.2V

SSEL

MSEL

SRDATA

DV

DVss1

MCLK

MDATA

SENSE
/FLOCK
/TLOCK

BLKCK

SQCK
SUBQ

DMUTE

SMCK

TRV

TVD

2122232425262728293031323334353637383940

BCLK
LRCK

MLD

STAT
/RST

CSEL

1
2
3

3.2V

DD

1

4
5

0V

TX

6

3.2V

7

0V

8

3.2V

9
10
11
12

0V

13

3.2V

14

0V

15
16

0V(3.1V)

17

3.2V

18
19
20

PLAY

2ms. 0.1V/DIV.

0.1V
P-P

C745

1000P

I
H
G

F

E
D

C

B
A

PLAY

T 13.3ms.

3.2V

0V

TP16

7.5V

S701

(REST)

TP1

10

R753

1

32 4 5 6 7 8 9 10 11 12 13

/RST

STAT

SUBQ

RESTSW

SQCK

F

To FL CIRCUIT(CP606) on SCHEMATIC DIAGRAM-13

BLKCK

SPEED

MLD

41

MDATA

MCLK

TP15

P.GND

C743

0.1

TP17TP14TP13TP12TP8TP7TP6TP4TP2

+B(1)

A.GND

191817161514

3.3V

3.3V

B

A

CN702

Lch OUT

IHGFEDCBA

C753
470P

+B(2)

TP22

Rch OUT

TP19

TX

LD SW

D.GND

SA-AK48

SCHEMATIC DIAGRAM-3

DECK1

Lch

PLAYBACK
HEAD

Rch

DECK2

Lch

R/P HEAD

Rch

ERASE
HEAD

ERASE CURRENT
CHECK POINT

TP12

1

2

3

4

5

1

2

3

4

5

MECHANISM CONTROL CIRCUIT

B

CS1101

CS1102

R1182

1

TP11

TP4

TP3

TP1

TP6

TP2

C1103

680P

C1104

0.022

((0V))

4.5V

((0V))

4.5V

:POSITIVE VOLTAGELINE

15K

R1103

C1193
1000P

((0V))

D

G

0.1V

((4.4V))

G

G

((0V))

S

((0V))

D

((0V))

S

S

((0V))

((0V))

D

C1101

1000P

100K

R1183

Q1101
2SJ498CDTA

HEAD SELECT
(REC:ON)

Q1103
2SJ498CDTA

HEAD SELECT
(PLAY:ON)

Q1104
2SJ498CDTA

HEAD SELECT
(PLAY:ON)

:TAPEPLAYBACKSIGNALLINE
:RECORDING SIGNAL LINE

0.47

C1183

C1184

24.9V

((0.1V))

1500P

4.7K

R1189

C1185

4700P

10K

R1173

Q1171
2SD1302STA

SWITCHING
(REC:ON)

((0V))

0.1V

((0V))

Q1179
2SC2412KT96R

SWITCHING
(BEATPROOF)

TP5

IC1102
BA7755A

R/P SELECT

CC

V

1 2 3 4 5

((7.8V))

((0V))

10.8V

R1188

1K

L1201

6
5
4

D1171

MA111TX

D1174

MA8036HTX

((0V))

0.7V

L1202
1
2

3

C1175

C1174

R1172

330

47 H

35V220

50V4.7

1K

R1170

0.01

C1173

((0V))

4.8V

R1174

10K

GND

C1176

D1172

MA8047MTX

R1176

0.6V

100K

0.047

4.7K

R1102

((0V))

330K

R1101

R1195

100K

14.3V

((14.7V))

Q1175

R1178

1.2
((0.1V))

0.1V
((0V))

Q1176

14.3V

((14.7V))

5.6K

R1177

((0V))

4.7K

((4.8V)):CrO

Q1173
DTC144TKA146

BIAS OSC CONT.(CrO2)

((4.4V))

C1177
1000P

0.6V

((0V))

0V

0.6V

((0V))

C1178

1000P

D1175

MA111TX

0.6V

((0V))

2

G

0.1V

C1194
1000P

Q1175,1176
2SC2002KTA

BIAS OSC

C1180

S

Q1102

((0V))

2SJ498CDTA

HEAD SELECT
(REC:ON)

((0V))

D

C1102
1000P

R1104

15K

14.6V

R1179

2.7K

0.01

C1181

R1180

2.7K

0.01

C1179

0.01

0.9V

((0V))

Q1174
2SC2412KT96R

BIAS OSC CONT.

C1182

50V4.7

TP171

R1184

R1181

3.3K

TP172

TP170

100K

42

SCHEMATIC DIAGRAM-4

:TAPEPLAYBACKSIGNALLINE:RECORDING SIGNAL LINE:POSITIVE VOLTAGELINE

Q1107
DTC144TKA146

P.BEQ/RECEQ

2

/H.SPEED)

(CrO

47K

((0V)):CrO
((0V))

((0V))

SA-AK48

2

R1105

270

IC1101
M51167AFP-TB

P.BEQ/RECAMP/
ALC/TPS AMP

AB

C1123

50V1

C1113

9.3V

C1111

C1112

820P

B

A

A

B

820P

6.3V220

39

R1107

C

C

R1108

C1114

3233343536

39

6.3V220

C1105

C1106

1200P

1200P

C1109

C1108

16V33

16V100

8.8V

((9.4V))((0V))

((9.9V))

Vcc

AGC

1 32

OFF

((0V)) ((4.7V)) ((0V)) ((1.1V))((4.8V)) ((4.8V)) ((5.1V)) ((5.1V)) ((4.9V)) ((5.2V)) ((5.0V))

C1117

C1147

1500P

R1111

C1115

R1109

0.033

4.3K

6.8K

R1141

31 27 26

PB

PB

4.4V 4.5V

6.8K

R1142

C1116

R1110

0.033

4.3K

R1112

C1118

C1148

1500P

EDC

2.2K

30

7 98654

2.2K

50V1

1800P

50V1

C1119

C1121

50V4.7

4.8V

((5.1V))

29

50V4.7

C1122

28

50V1

4.8V

PRE

PRE

C1124
1800P

4.5V4.5V

C1120

10K

33K

R1123

R1121

C1125

0.047

5.0V

((5.4V))

10 11 12 13

((5.4V))

C1126

0.047

33K

R1122

ALC

C1143

C1144

R1124

50V4.7

4.6V

4.6V5.0V4.8V4.8V

50V4.7

10K

C1129

820P

C1127

0.01

25

C1128

0.01

C1130

820P

R1125

R1115

390K

4.9V

REC

REC

R1116

390K

R1126

1K

C1133

50V4.7

C1131

820P

R1117

270K

24 23 22

4.9V4.9V

R1118

270K

C1132

820P

1K

C1135
1000P

B

R/P

14

C

SW

4.8V

C1140 16V10

C1136
1000P

A

15

R1132 3.3M

C1146
16V10

((0V)) ((4.1V))((0V)) ((5.1V))((0V))

C1141 50V0.1

68K

R1131

R1146

C1139

50V2.2

9.1V

4.7V

((0V))

((9.7V))((4.3V))((0V))((5V))((5.2V))((4.9V))((5.1V))((4.8V))((4.8V))((1.1V))((0V))

20

21

GND

TPS

16 18

17

3.8V

3.3K

R1133

0.022

C1142

R1134 470K

10K

19

((0V))

C1134

2

Q1206,1207
2SB621RTA

SOLENOID DRIVE

((10V))

((9.5V))

((10V))

((9.5V))

16V100

50V4.7

((0V))

Q1206

((0V))

Q1207

R1221

2.7

R1225

2.7

R1227

1K

R1226

1K

((5V))

((9.5V))

10K

Q1209

Q1108
DTC144TKA146

P.BEQ/RECEQ
(CrO2/H.SPEED)

14.6V 14.6V

10V

220

R1206

Q1203
2SD965RTA

MOTOR DRIVE

((0.8V))

((0V))

1

W1200

2

((0V))

47K

((0V))

((0V)):CrO

C1201

M

MOTOR

43

((5V))

((9.5V))

((4.5V))

10K

Q1208

D1202

((4.5V))

MA111TX

10V

D1201

MA111TX

A
B

C
D

E
F

5V

Q1208,1209
DTC114TKA146

SOLENOID DRIVE

A

B

SA-AK48

SCHEMATIC DIAGRAM-5

B

FBA C

B

C

:POSITIVE VOLTAGELINE

Q1151,1152
DTC144TKA146

SWITCHING
(PLAY:ON)

Q1151

47K

((4.0V))

0.2V

((4.0V))

0.1V

47K

Q1152

C1150

10V47

((0V))

((0V))

C1151

C1153

C1154

16V10

Q1153

((1.2V))

1000P

Q1154

((1.2V))

1000P

R1151

1M

R1152

1M

((10.6V))

((0.5V))

220

R1155

((10.6V))

((0.5V))

220

R1156

Q1153,1154
2SC2412KT96R

BUFFER AMP

:TAPEPLAYBACKSIGNALLINE
:RECORDING SIGNAL LINE

220

R1158

C1165

16V10

E

1.2K

R1153

C1162

16V100

1.2K

R1154

C1152
16V10

C1166
16V10

D

R1161

4.7K
R1196

47K

((0V))

Q1115

Q1116

((0V))

R1197

47K

14.6V

Q1115,1116
2SD2114K1V

MUTING

0.7V

((0.2V))

0.7V

((0.2V))

4.7K

R1162

C1186

10V47

R1186

1K

C1145

10V

16V10

F
E

R1213

1.5K

((2.4V))

Q1121

((0V))

R1192

D971

SOLENOID

IC971
0N2180RLC

PHOTO
INTERRUPTER

D1173

47

MA165TA

MA111TX

4.8V

0.1V

((0.5V))

((0.5V))

(ATS/CrO2)

820

R972

10K

R1139

R1145

10K

((0V))

((0.6V))

1

1

S973

((5V)) ((5V))

3 1

24

0.6V
0V

Q1120

39K

R973

R1191

R1190

56K

100K

4.7K

R1220

Q1118-1121
2SC2412KT96R

INTERFACE

5V

CP1102

932 4 5 6 7 8

932 4 5 6 7 8

CS971

S975

(F.REC.INH.)

S971

(MODE)

S974

(R.REC.INH)

S972

(HALF)

AED

5V

AEBCDF

((0.7V))

25K

25K25K

((0.7V))

((0V))

Q1118

((0V))

R1166

100K

S951

SOLENOID

1

1

(MODE)

D951

MA165TA

S953

)

2

S952

(HALF)

(ATS/CrO

IC951
0N2180RLC

PHOTO
INTERRUPTER

56K

R1165

932 4 5 6 7 8

932 4 5 6 7 8

5.V

R952

CP1101

CS951

3 1

820

((5V)) ((5V))

24

R953

39K

0.5V
0V

((0.1V))

((0V))

Q1119

47

R1167

Z971

1

2

4.7K

3

4

5

6

7

50K

4.7K
50K

4.7K
50K

4.7K
50K

50K

MECHANISM (DECK2) CIRCUIT

C

44

MECHANISM (DECK1) CIRCUIT

D

SCHEMATIC DIAGRAM-6

SA-AK48

:TAPEPLAYBACKSIGNALLINE:RECORDING SIGNAL LINE:POSITIVE VOLTAGELINE

14.6V

Z1101

50K

4.7K

4.7K

1 2 3 4 5 6

A
B
C
D
E
F

5V

IC1105
BU2090AF-E2

SYSTEM CONTROL

Q1218
DTA114EKA146

SWITCHING
(REC:ON)

D

4.8V

C

((5V))

B

((4.9V))

A

((5V))

((0V))

10K

4.7K

((0V))

Q1220
DTA143XKA146

MOTOR DRIVE

4.7K

10K

((4.8V))

0.2V

25K

25K25K

50K

50K

50K

50K

4.7K

4.7K
7

R1233

2.2K

4.7K

R1234

5.1V

((0.2V))

8 7 6 5 4 3 2 1

BP1

DMT

BP2

9 10 11 12 13 14 15 16

R1230

4.7K

1K

R1232

DOLBY

IH

REC

((0V)) ((4.8V)) ((0V)) ((0V)) ((4.6V)) ((5V))

4.7V

0.2V

2.2K

R1106

((4.7V)) ((0V)) ((0V))

TAPE

HI SP

1M

2M

((0.5V))

0V

CLK

2PL

4.5V

AB

DATA

1PL

100P

C1188

0.1

C1202

Vcc GND

R1216 2.2K
R1215 2.2K

100P

C1187

A

B
C

D
E

F

5V

4.7K

R1235

R1236

R1144 10K
R1143 10K

TP10 TP9

4.7K

10V

1
2
3
4
5
6
7
8
9

10

8
7
6
5
4
3
2
1

H1100

M.GND
MO.GND
+B(5)
D.GND
+B(3)
Rch IN

Lch IN
A.GND
Rch OUT
Lch OUT

CN1201

VREF(+)
ADIN7
ADIN6
TPS
D.GND
MKCLK

MKDATA
+B(6)

E

To MAIN

(DSC)
CIRCUIT

(CN304) on
SCHEMATIC
DIAGRAM

K

To FL

CIRCUIT

(H600) on
SCHEMATIC

DIAGRAM

-

9

-

13

45