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

Page 38

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)

Image 38

Contents Specifications RMT-V293A/V294ASafety CHECK-OUT Disassembly Adjustments Table of ContentsService Note Block DiagramsService Note Error Code IndicationSetting up the remote commander HookupsCompleting A/V hookup Hookup 1 VCR setupHookup Antenna hookup HookupHookup 3 VCR setup Hookup 2 VCR setupHookup Connecting a cable box with many scrambled channels Automatic clock settingSelecting a language Setting the clockUsing the Auto Clock Set feature Using Manual Clock Set If the clock does not activatePresetting/disabling channels manually Presetting channelsPresetting all receivable channels automatically Playing a tape If the picture is not clearRecording TV programs To save a recording Recording TV programs using the Dial TimerTo watch another TV program while recording Before you startRecording TV programs using the timer About the Demonstration ModeTo resume normal playback Playing/searching at various speedsLocking the VCR Child Lock To lock the VCRRecording stereo programs Setting the recording duration timeChecking/changing/canceling timer settings Recording bilingual programsSearching using the Time Search function Searching for the beginning of a timer recorded programSearching using the index function How sound is recorded on a video tapePress H Play or x Stop To cancel skip-searchSearch forward while Showing the tape contents Fast-forward Changing menu options Adjusting the pictureAdjusting the tracking About the Adaptive Picture Control APC functionEditing with another VCR How to connect to record on this VCROperation when recording on this VCR Before you start editingGeneral setup information Index to parts and controlsDisplay window Rear panel11--19E SLV-LX40/LX50/LX60S/LX70S Section Disassembly CASE, Front Panel Block AssemblyRear Panel Mechansim Deck Bottom View Internal ViewsTop View Circuit Boards Location Overall Block Diagram Video Block Diagram SERVO/SYSTEM Control Block Diagram Tuner Block Diagram Audio Block Diagram Power Block Diagram TA a Xedit → Edit PB/XREC → PB/RECFrame Schematic Diagram VIDEO, AUDIO, SERVO/SYSTEM CONTROL, TUNER, Power See page 4-21 for waveforms MA-405 BOARD1/7 MA-405 REC/PB Head AMP Schematic DiagramREC/PB Head AMP Audio Processor VA Block MA-405 Y/C, Audio Processor Schematic DiagramAudio Process MA-405 SERVO/SYSTEM Control Schematic Diagram SERVO/SYSTEM Control SS BlockAudio Process AU Block MA-405 Audio Process Schematic DiagramSee page 4-5 for printed wiring board MA-405 BOARD4/7 Tuner MA-405 Tuner Schematic DiagramSee page 4-5 for printed wiring board MA-405 BOARD5/7Display Control Front Block MA-405 Display Control Schematic DiagramSee page 4-5 for printed wiring board MA-405 BOARD6/7 See page 4-5 for printed wiring board MA-405 BOARD7/7 Power SupplyMA-405 Power Supply Schematic Diagram Power Supply PS BlockDrum PG REC/PBDrum FG OSD V OUTLine 2 Line 2FJ-32 Board DI-80 Board Dial TimerDial Timer Signal Pin No System Control Mechanism Block Interface MA-405 Board IC160System Control VIDEO/RP Block Interface MA-405 Board IC160 System Control Audio Block Interface MA-405 Board IC160Pin Name Function 55-4E Preparation Before Adjustment Mechanical AdjustmentsElectrical Adjustments Power Supply Check Input/Output Levels and ImpedanceVTR Audio System AdjustmentServo System Check ACE Head Adjustment SW5V Adjusting Parts Location DiagramVIDEO/AUDIO Line IN/OUT RF/HF SWPExploded Views Front Panel and Upper Case SectionChassis Section 5455721 711 720 713 725 724 714 719 715 717 718 Mechanism Deck707 708 712 706 702 701 709 704 710 705 722 703 Roller ASSY, Guide Spring Power TensionBrake ASSY,MAINT Spring803 802 833 Screw + P2.6 x 6 TYPE2 NON-SLITLX70SCL,CS Connector SwitchSWITCH, Tact ResistorMA-405 Double LayerFilm CeramicMylar HOUSING, Connector 6P LX40/LX50 CONNECTOR, FFC/FPC 5PPIN, Connector 4P CONNECTOR, FFC/FPC 7PShort Jumper Selector FILTER, Line Fluorescent Indicator TubeTUBE, Fluorescent Indicator Short CoilTransistor 2SC1815GR-TPE2 TransistorTransistor PT380F3 Transistor 2SC2712Y-TE85LMetal Oxide SWITCH, Tact Ppause SWITCH, Rotary ModeSWITCH, Tact 0REW SWITCH, Tact ·PLAYRef. No Description Remarks Ref. No Sony Corporation Published by Quality Assurance Dept