Cambridge L937CT Schematic

321

4

D

C

D

C

Main signal path L937C2_1.2.SCH

B

ITEM1

15mm x 6mm x 3mm

DAMPING PAD

E802AP

15X6X3_DAMPING_PAD

Power supply L937C3_1.2.SCH

B

DRAWING TITLE

Integrated amplifier preamp

PCB1

A

PCB

L937PB_1

1 2 34

23425

A & R Cambridge Ltd. Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB

Notes:

Contact Engineer: Mark Tweedale Contact Tel: 01223 203200

Filename

J:\Change_Control\ECO_WIP\03_E291 Transistor obsolete P7 A32 A90 C30 - MJT\L937AY - A32 A90 preamp board\L937_1.2.ddb - Documents\Schematic\L937C1_1.2.PRJ

Circuit Diagram

03_E291 MJT 07/10/03 01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1

01_1142 JBR 14/8/01 First production release 1.0

ECO No. DESCRIPTION OF CHANGE

Date Printed

INITIALS

9-Oct-2003

DATE

None to this sheet. Transistors Q301(4B5248) & Q305(4B1964) obsolete. Replace with 4B5171 & 4B1930. Replaced 470p caps 2D147W with 2DA147

Drawn by:

JBR

13Sheet of

DRAWING NO.

L937C1

1.2

A

ISSUE

7654321

D100

+15V -15V

BAV99W DUAL SM

AUX L

SK2A

CDL1 CDL

CD INPUT

1

F

EMC

N

C100 1N0 SM

0V_SIG

D

TUNER INPUT

CDR1

PHONO4G

+15V -15V

SK2B

TUNL1

F

N

PHONO4G

+15V -15V

C

AV INPUT

SK3A

AVL1

1

F

EMC

N

C121 1N0 SM

0V_SIG

DVD INPUT

B

TAPE INPUT

AVR1

PHONO4G

+15V -15V

SK3B

DVDL1

F

N

DVDR1

PHONO4G

+15V -15V

SK4A

TAPEIL1

1

F

EMC

N

C139 1N0 SM

0V_SIG

VCR INPUT

A

C160 1N0 SM

0V_SIG

TAPEIR1

PHONO4G

+15V -15V

SK5A

VCRIL1

1

F

EMC

N

VCRIR1

PHONO4G

+15V -15V

1 2 3 4 5 6 78

R100 1K0 SM

0V_SIG

R101 1K0 SM

D101 BAV99W DUAL SM

D102 BAV99W DUAL SM

R102 1K0 SM

0V_SIG

TUNR1

R125 1K0 SM

D106 BAV99W DUAL SM

D107 BAV99W DUAL SM

R126 1K0 SM

0V_SIG

R127 1K0 SM

D108 BAV99W DUAL SM

D112 BAV99W DUAL SM

R156 1K0 SM

0V_SIG

R157 1K0 SM

D113 BAV99W DUAL SM

D114 BAV99W DUAL SM

R158 1K0 SM

0V_SIG

R189 1K0 SM

D115 BAV99W DUAL SM

D116 BAV99W DUAL SM

R190 1K0 SM

0V_SIG

R191 1K0 SM

D117 BAV99W DUAL SM

0V_SIG

DVDR

0V_SIG

TAPEIL

0V_SIG

TAPEIR

0V_SIG

VCRIR

0V_SIG

R103 100K SM

CDR

R104 100K SM

TUNL

R105 100K SM

TUNR

R128 100K SM

AVL

R129 100K SM

AVR

R130 100K SM

DVDL

R159 100K SM

R160 100K SM

R161 100K SM

R192 100K SM

VCRIL

R193 100K SM

R194 100K SM

CD L

C101

470P FKP2 100V

CD R

C102

470P FKP2 100V

0V_SIG

TUNER L

C103

470P FKP2 100V

TUNER R

C122

470P FKP2 100V

0V_SIG

AV L

C123

470P FKP2 100V

AV R

C124

470P FKP2 100V

0V_SIG

DVD L

C140

470P FKP2 100V

DVD R

C141

470P FKP2 100V

TAPE IN L

C142

470P FKP2 100V

TAPE IN R

C161

470P FKP2 100V

VCR IN L

C162

470P FKP2 100V

VCR IN R

C163

470P FKP2 100V

+15V

-15V

+15V

-15V

+15V

-15V

C127 100N SM

C128 100N SM

0V_SIG

+15V

-15V

C106 100N SM

C107 100N SM

C125 100N SM

C126 100N SM

+15V

-15V

AUX INPUT

C164 1N0 SM

C104 100N SM

C105 100N SM

0V_SIG

+15V

-15V

C145 100N SM

C146 100N SM

VCR2

C143 100N SM

C144 100N SM

PHONO2G

CD L TUNER L AV L DVD L

VCR IN L MODULE L

0V_SIG

TAPE 2

AUX R CD R TUNER R AV R DVD R

VCR IN R MODULE R

TAPE 1

TAPE 2

AUX L CD L TUNER L AV L DVD L TAPE IN L

MODULE L

VCR01

AUX R CD R TUNER R AV R DVD R TAPE IN R

MODULE R

AUX L CD L TUNER L AV L DVD L TAPE IN L VCR IN L MODULE L

LIST1

LIST2

AUX R CD R TUNER R AV R DVD R TAPE IN R VCR IN R MODULE R

LISTEN0

LISTEN1

LISTEN2

D118 BAV99W DUAL SM

AUXIL1

1

TAPE 0

TAPE 1

0V_SIG

TAPE 0

0V_SIG

VCR 2

0V_SIG

VCR 2

0V_SIG

LIST0

VCR 1

R162 22K SM

R163 22K SM

R164 22K SM

R165 22K SM

R166 22K SM

R167 22K SM

R168 22K SM

R169 22K SM

TAP0

TAP1

TAP2

TAPE0

TAPE1

TAPE2

VCR11

VCR21

VCR0

VCR1

+15V -15V

SK6

F

EMC

N

0V_SIG

AUXIR1

+15V -15V

D119 BAV99W DUAL SM

+5V

VCR 0

+5V

VCR 0

R195 1K0 SM

R196 1K0 SM

-15V

LISTEN 0 LISTEN 1 LISTEN 2

0V_SIG

LISTEN 0 LISTEN 1 LISTEN 2

0V_SIG

Z100

4 5 6 7

12 11 10

9 2

1

16 15

14

3

DG408DY

Z101

4 5 6 7

12 11 10

9 2

1

16 15

14

3

DG408DY

Z102

4 5 6 7

12 11 10

9 2

1

16 15

14

3

DG408DY

Z103

4 5 6 7

12 11 10

9 2

1

16 15

14

3

DG408DY R170

22K SM R171

22K SM R172

22K SM R173

22K SM

R174 22K SM

R175 22K SM

R176 22K SM

R177 22K SM

AUXL

0V_SIG

X0 X1 X2 X3 X4 X5 X6 X7

EN A0 A1 A2

GND V-

X0 X1 X2 X3 X4 X5 X6 X7

EN A0 A1 A2

GND V-

X0 X1 X2 X3 X4 X5 X6 X7

EN A0 A1 A2

GND V-

X0 X1 X2 X3 X4 X5 X6 X7

EN A0 A1 A2

GND V-

+5V

-15V

+5V

-15V

R197 100K SM

AUXR

R198 100K SM

V+

D

V+

D

V+

D

V+

D

Z104

4

X0

5

X1

6

X2

7

X3

12

X4

11

X5

10

X6

9

X7

2

EN

1

A0

16

A1

15

A2

14

GND

3

V-

DG408DY Z105

4

X0

5

X1

6

X2

7

X3

12

X4

11

X5

10

X6

9

X7

2

EN

1

A0

16

A1

15

A2

14

GND

3

V-

DG408DY

AUX L

C165

470P FKP2 100V

AUX R

C166

470P FKP2 100V

+15V

13 8

0V_SIG

+15V-15V

13 8

0V_SIG

+15V

13 8

0V_SIG

+15V-15V

13 8

0V_SIG

SK103

1 2 3 4 5 6 7

TO PHONO PCB

8

AMPCT8

R106 1M0 SM

R107 1M0 SM

R131 1M0 SM

R132 1M0 SM

V+

D

V+

D

0V_SIG

13 8

AUX R

AUX L

+15V

+15V1

0V_HF

0V_SIG

+15V

AUXR1

-15V1

-15V

+15V -15V

Z109A TL072 SM

3

1

2

Z109B TL072 SM

5 6

Z110A TL072 SM

3 2

Z110B TL072 SM

5 6

2 3

C147 100N PE

2 3

C167 100N PE

AUXL1

C108 100P SM

+15V -15V

7

C109 100P SM

+15V -15V

1

C129 100P SM

+15V -15V

7

C130 100P SM

C148

22P SM R178 22K SM

1

Z115A

OPA2134PA SM

R180 100K SM

C149

22P SM R179 22K SM

1

Z116A

OPA2134PA SM

R199 100K SM

84

Z109C

TL072 SM

-15V2

-15V

84

Z113C

TL072 SM

-15V

D103 BAV99W DUAL SM

R108 47R SM

D104 BAV99W DUAL SM

R109 47R SM

D109 BAV99W DUAL SM

R133 47R SM

D110 BAV99W DUAL SM

R134 47R SM

Z115_1A

C150

470N PE

7

Z115B

OPA2134PA SM

+15V

+

C188 10U EL

+

C189 10U EL

-15V

C151

470N PE

7

Z116B

OPA2134PA SM

C168 100N SM

0V_SIG 0V_SIG 0V_SIG 0V_SIG

C169 100N SM

C170 100N SM

0V_SIG 0V_SIG 0V_SIG 0V_SIG 0V_SIG

C171 100N SM

TAPEO1

0V_SIG

TAPE02

VCRO1

0V_SIG

VCR02

6 5

0V_SIG

Z116_1A

6 5

84

Z110C

TL072 SM

84

Z114C

TL072 SM

SK4B

F

N

PHONO4G

VCR OUTPUT

SK5B

F

N

PHONO4G

R183 1M0 SM

0V_SIG

R184 1M0 SM

0V_SIG

C172 100N SM

C173 100N SM

C174 100N SM

C175 100N SM

TAPE OUTPUT

TONE*

C152 100N SM

TONE*

Z111C

TL072 SM

Z115C

OPA2134PA SM

0V_SIG

84

1 2 3 4

6 7 8

C176 100N SM

C177 100N SM

C178 100N SM

C179 100N SM

+

C110 100U EL

0V_SIG

+

C131 100U EL

0V_SIG

Z106

SEL1 D1 S1 VGND5VL S4 D4 SEL4

DG413DY

+15V2

Z112C

TL072 SM

OPA2134PA SM

SEL2

SEL3

+15V

84

Z116C

+5V

R110 2K2 SM

Z111_3

R112 22K SM

R111 2K2 SM

Z115_1B

+5V

R135 2K2 SM

R137 22K SM

R136 2K2 SM

Z116_1B

/TONE

TONE*

16 15

D2

14

S2

13

V+

+5V

12 11

S3

10

D3

9

C180 100N SM

C181 100N SM

C182 100N SM

C183 100N SM

0V_SIG

TONE*

OPA2134PA SM

R113 22K SM

+

C111 10U CERAFINE

Z113_3

R138 22K SM

+

C132 10U CERAFINE

+15V-15V

C153 100N SM

+15V

84

Z117C

Z111A TL072 SM

3 2

Z113A TL072 SM

3 2

+

Z107_4

Z107_13

0V_SIG

0V_SDATA

0V_SLOAD

0V_SCLK

C184 100N SM

C185 100N SM

C154 10U EL

Z111_7

Z113_7

Z111_1

1

Z113_1

1

C155 100N SM

0V_SIG

R182 100R SM

R200 2R2 SM R201 2R2 SM R202 2R2 SM

D105 BAV99W DUAL SM

0V_SIG

Z112_3

1618

Z108D

17

DS1844

Z108_19

C113 470N PE

5 6

R115 2K7 SM

R116 2K7 SM

D111 BAV99W DUAL SM

62

Z108B

7

DS1844

Z108_3

C134 470N PE

5 6

R140 2K7 SM

R141 2K7 SM

0V_SIG

C156 100N SM

1

0V_SIG

AVCC

16

SCLK

SDATA

SLOAD

+5V

C186

100N SM

0V_SIG

Z114_3

0V_SIG

LFO

LMO RFO

RMO

R181 10K SM

1519

DS1844

0V_SIG

53

DS1844

+

C157 100U EL

3

2 14

15

Z107 VSDVC

Z108A

14

C114 CFKP2 63V 2N2

R117 5K6 SM

0V_SIG

Z108C

4

C135 CFKP2 63V 2N2

R142 5K6 SM

2 3

0V_SIG

6 5

0V_SIG

+

C187 10U EL

Z114A TL072 SM

3 2

+15V

-15V

Z117A

OPA2134PA SM

Z117B

OPA2134PA SM

7

Z111B TL072 SM

470N PE

7

Z113B TL072 SM

470N PE

+5V

4 5

13 12

R114 22K SM

C112

C192

+5V

R139 22K SM

C133

C193

7

LIN LGND

RIN RGND

R185 22R SM

Z107_1

DVCC

DGND11XCS6DATA9CCLK10XMUTE8AGND

DRAWING TITLE

Integrated amplifier preamp - main signal path

23425

A & R Cambridge Ltd. Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB

Notes:

Filename

J:\Change_Control\E CO _WI P\ 03_E 291 T ransi sto r o b so lete P 7 A 32 A90 C30 - MJT\L937AY - A32 A90 preamp board\L937_1.2. d d b - Do cu ments\Schematic\L937C2_1.2. S C H

Circuit Diagram

Contact Engineer: Mark Tweedale Contact Tel: 01223 203200

Z112A TL072 SM

3 2

R118 22K SM

C136

22P SM

R143 22K SM

+

C190 10U EL

+

C191 10U EL

C158 22P SM

1

C159 22P SM

7

D120 BAS16W SM

C115

22P SM

1

0V_SIG

Z112B TL072 SM

Z112_1

5

1

6

Z114B

Z114_1

TL072 SM

5 6

+15V -15V

SK102_1

R186 47R SM

SK102_3

R187 47R SM

+5V

+-RLY100C

RLY DPDT 5V SM

Q100 BC849B

0V_D

Z112_7

7

10U CERAFINE

R119 22K SM

R120 22K SM

+

C116 10U CERAFINE

0V_SIG

C138

7

10U CERAFINE R144 22K SM

R145 22K SM

+

C137 10U CERAFINE

0V_SIG

D122 BAV99W DUAL SM

D121 BAV99W DUAL SM

RLY100A

RLY DPDT 5V SM

0V_SIG

R203 4K7 SM

03_E291 MJT 07/10/03 01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1

01_1142 JBR 14/8/01 First production release 1.0

ECO No. DESCRIPTION OF CHANGE

Date Printed

C117

+

RLY DPDT 5V SM

MUTE*

INITIALS

9-Oct-2003

Z106_14

Z106_11Z114_7

R146 22K SM

RLY100B

DATE

SCLK

13

SDATA

IC DS1844

R122 2R2 SM

R124 2R2 SM

R123 2R2 SM

LISTEN 0 LISTEN 1 LISTEN 2 VCR 0 VCR 1 VCR 2 TAPE 0 TAPE 1 TAPE 2

TONE* TONEID

0V_SLOAD

0V_SIG

23Sheet of

12

9

MUTE*

SDATA

CLK DIN RST

0V_SCLK

SCLK

SDATA

R121

TONEID

22K SM

SK102

1 2 3 4

AMPCT4 TO POWER AMP I/P

Transistors Q301(4B5248) & Q305(4B1964) ob so l e te. Replace with 4B5171 & 4B1930. Replaced 470p caps 2D147W with 2DA147

Drawn by:

JBR

TONEID

0V_TONEID

0V_SDATA

0V_SCLK

0V_D

0V_TONEID

0V_SDATA

+5V

R147 22K SM

R148 22K SM

R149 22K SM

R150 22K SM

SLOAD

R188

10K SM

8

20

Z108E

VCC

1

PS

8

R/W

11

DOUT

GND

10

0V_SIG

SCLK

AUX L AUX R CD L CD R TUNER L TUNER R AV L AV R DVD L DVD R TAPE IN L TAPE IN R VCR IN L VCR IN R MODULE L

MODULE R

0V_MODULE

DRAWING NO.

C118 100N SM

R204 10K SM

C119 10N SM

R151 22K SM

R152 22K SM

R153 22K SM

R154 22K SM

R155 22K SM

FFC22V1MM

L937C2

+

C120 10U EL

SK100

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22

SK101

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

FFC30V SM

ISSUE

D

C

TO MICRO / DISPLAY PCB

TO PLUG IN MODULE PCB

B

A

1.2

321

4

D302

BAS16W SM

Q305

2SA1930

D

C

SK300 MOLEXPWR4

3

4

1

2

F300

T2A SM

F301

T2A SM

AC1

C307 470N PE

AC2

D300 S1D

C308 100N SM

C309 100N SM

D301 S1D

UR+

+

C300 1000u 35V

Q300 J112

R300 330R SM

C314 1N0 PP

C315 1N0 PP

Q303 J112

Q306 BC846B

D310+

+

C302 220U EL

+

C312 220U EL

D311-

D310 15V 350MW SM

D311 15V 350MW SM

+15V

+

I

+15V3

C304 100N SM

C303 3300u 25V

C313 3300u 25V

Z301 LM317T

Vin

0V_PSU

D304

BAS16W SM

Vout

ADJ

A

+3.75V

R302 1K2 SM

R307 220R SM

O

+

C305 10U EL

-15V

D305 BAS16W SM

+15V

0V_PSU

0V_MODULE

R303 470R SM

SK301

1 2 3 4

IDC4S

+5V

+

C306 470U EL 25V

D

C

D306 S1D

B

D307 S1D

+

UR-

C310 1000u 35V

R304 330R SM

Q301

2SC5171

D308

BAS16W SM

Q307 BC856B

-15V

-15V3

SP300 STAR POINT 4

0V_HF 0V_MODULE

0V_PSU

0V_SIG

B

DRAWING TITLE

Integrated amplifier preamp - power supply

A

23425

Notes:

Circuit Diagram

03_E291 MJT 07/10/03 01_E014 JBR 28/11/01 Fuses uprated to 2A 1.1

Transistors Q301(4B5248) & Q305(4B1964) obsolete. Replace with 4B5171 & 4B1930. Replaced 470p caps 2D147W with 2DA147

1.2

A

A & R Cambridge Ltd. Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB

1 2 34

Contact Engineer: Mark Tweedale Contact Tel: 01223 203200

Filename

J:\Change_Control\ECO_WIP\03_E291 Transistor obsolete P7 A32 A90 C30 - MJT\L937AY - A32 A90 preamp board\L937_1.2.ddb - Documents\Schematic\L937C3_1.2.SCH

01_1142 JBR 14/8/01 First production release 1.0

ECO No. DESCRIPTION OF CHANGE

Date Printed

INITIALS

9-Oct-2003

DATE

Drawn by:

JBR

33Sheet of

DRAWING NO.

L937C3

ISSUE