Sony RMT-V294A, LX70S, RMT-V293A, LX60S, LX40, LX50 MA-405 REC/PB Head AMP Schematic Diagram

SLV-LX40/LX50/LX60S/LX70S

MA-405 (REC/PB HEAD AMP) SCHEMATIC DIAGRAM

– Ref. No: MA-405 board; 1000 series –

• See page 4-21 for waveforms.

12

MA-405 BOARD(1/7)

REC/PB HEAD AMP(RP BLOCK)

A XX MARK:NO MOUNT

EP CH2

B

EP CH1

SP CH2

C

SP CH1

D

AUDIO CH1

AUDIO CH2

E

LX60S/LX70S

3

4

5

6

7

8

9

10

11

12

13

14

NO MARK:REC/PB MODE

CN270

R :REC MODE

JL271

4P

P :PB MODE

HF ADJ

4

1

5

JL272

PB RF

CHECK

2

C285

JL273

RF SWP

0.01u

3

JL274

AN_GND

4

B+

IC260

B+

VIDEO REC/PB AMP

3

JL277

VA1

REC CURR ADJ

JL278

6

C280

L270

VA2

REC H

1

100u

100uH

R3.2/

R273

0.60mm

JL279

4.9

VA3

REC C

10V

13

ALL 5V

H.SYNC

12

P2.5

MA-405 (2/7)

C283

R272

R4.2/

R4.1/

VA4

REC Y RF

(SEE PAGE 4-9)

0.01u

R274

3900

JL280

1800

P4.9

14

AGC DET

11

P0

B

VA5

PB RF

C279

}0.5%

R3.4/

C281

B

R267

JL281

R1.4/P0

0.01u

VS3

0

COMP SYNC

CN260

0.1u B

15

ATT

10

P0.4

JL282

C278

VCC

11P

R3.9/

R3.4/

C282

B

VA7

TRICK H

0.022u

11

EP CH2 F

11

B

P2.0

17 16

AMP CURRENT AMP

AGC SP HA

8 9

P0

0.01u

JL260

1k

R276

EP CH2 S

10

10

JL261

6800

EP CH1 F

R271

C276

9

9

R3.8/

JL264

470

0.1u

R0/P1.6

8

SP CH2 F

8

B

P2.0

18

10k

7

BIAS

JL265

R2.5/

C284

SP CH2 S

C275

SW30

EP

ENVELOPE DET

7

7

JL263

0.01u

P0

R0/P2.6

0.22u B

JL284

RS1

RF ENV

6

SP CH1 F

6

B

R277

2

JL262

R3.9/P2.0

0.3

22k

VS6

RF SWP

5

AN_GND

5

2019

PB ON

RECOFF

AMP

VCCVCC

PBOFF

AMP REC SPOFF

EP OFF HATO

56

JL286

JL266

HA CONT

VS7

HA SWP

MA-405 (3/7)

4

FE

4

R1.6/P2.0

1.8

JL287

JL267

RS2

ENV SW

(SEE PAGE 4-11)

3

AUDIO CH1 H

3

R278

JL268

R1.6/P2.0

22 21

CURRENT AMP

H.SYNC

3 4

0

22k

2

AUDIO REC

2

JL269

R270

C272

R2.5/

COMP

R279

AUDIO CH2 L

R0.2/P0.5

1

1

470

0.1u

P0

22k

JL270

B

24 23

PB OFF

REC SP OFF

EP OFF

10k

BIAS

1 2

SW30

C271

R1.6/P2.0

R2.0/P4.2

AMP

0.01u

B

L

VCC

H

C267

C286

B+

3

C268

IC260

LA70011

0.1u

XX

100p

SW_5V

AN_GND

B

CH

MA-405 (7/7)

AN_GND

(SEE PAGE 4-19)

1

2

AU1

AUDIO CH2

4

AU2

AUDIO REC

AU3

AUDIO CH1

MA-405 (4/7)

AN_GND

(SEE PAGE 4-13)

AU_PB_RF

VIDEO HEAD

F

SIGNAL PATH

VIDEO SIGNAL

AUDIO

SIGNAL

CHROMA Y Y/CHROMA

	MA-405	)
	VIDEO, AUDIO,
	SERVO/SYSTEM CONTROL,
(POWER, EJECT SWITCH)	( TUNER, POWER SUPPLY

REC

PB

FJ-32 (LINE 2 IN)

DI-80 (DIAL TIMER)

4-7 4-8

REC/PB HEAD AMP

MA-405(1/7)