Sony RMT-V294A, LX70S, RMT-V293A, LX60S, LX40, LX50 service manual Safety CHECK-OUT

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SAFETY CHECK-OUT

After correcting the original service problem, perform the following

safety checks before releasing the set to the customer.

1.Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges.

2.Check the interboard wiring to ensure that no wires are "pinched" or contact high-wattage resistors.

3.Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement.

4.Look for parts which, though functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement.

5.Check the B+ voltage to see it is at the values specified.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS

LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

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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