Yamaha-DVDS796-dvd-sm 维修电路原理图.pdf

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1、DVD-S796/S5270DVD-S796/DV-S5270100711SERVICE MANUALDVD PLAYERDVD-S796/DV-S5270SERVICE MANUALSERVICE MANUALIMPORTANT NOTICEThis manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.It has been assumed that basic service procedures inherant to the industry, a

2、nd more specifically YAMAHA Products, are alreadyknown and understood by the users, and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personalinjury, destruction of expensive components and failure of th

3、e product to perform as specified. For these reasons,we advise all YAMAHA product owners that all service required should be performed by an authorizedYAMAHA Retailer or the appointed service representative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitu

4、te authorization, certification orrecognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, andservice departments of YAMA

5、HA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitableand specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contactthe distributors Service Division.WARNING:Static discharges can des

6、troy expensive components. Discharge any static electricity your body may have accumu-lated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).IMPORTANT:Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply powe

7、r to the unit.RadioFans.CN 收音机爱 好者资料库DVD-S796/DV-S5270SPECIFICATIONS .1-1LOCALE MANAGEMENT INFORMATION . 1-1TO SERVICE PERSONNEL .1-2PREVENTION OF ESD TO ES DEVICES. 1-3PRECAUTION OF LASER DIODE.1-4HANDILNG PRECAUTIONS FOR TRAVERSE DECK.1-4REAR PANELS .1-5OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMEN

8、T PROCEDURE .1-6SELF-DIAGNOSIS FUNCTION AND SERVICE MODES.1-7SERVICE PRECAUTIONS .1-9SERVICE TOOLS AND EQUIPMENT .1-9OPERATING INSTRUCTIONS .1-10CONTENTSSECTION 1SECTION 2ASSEMBLING AND DISASSEMBLING THE CASING AND CHECKINGC. B. A.s1.Disassembly Procedure .2-12.Casing Parts and C.B.A. Positions .2-2

9、3.Service Positions .2-24.Disassembling the Top Cover.2-35.Disassembling the Tray .2-36.Disassembling the Front Panel .2-37.Disassembling the Loading Base Unit . 2-48.Checking the Module C.B.A.2-49.Disassembling the Rear Panel .2-410.Checking the Power Supply C.B.A.2-511.Checking the Mother C.B.A. .

10、2-512 Checking the Power Switch C.B.A. .2-513.Checking the Front Switch C.B.A.2-5ASSEMBLING AND DISASSEMBLING THE OPTICAL PICKUP1.Handling the Optical Pickup.2-62.Disassembly Procedure .2-63.Lubricating the Loading Base Unit . 2-74.Static Electricity Countermeasures . 2-85.Disassembling the Clamp Ba

11、se Unit.2-96.Disassembling the Clamper Weight, Clamper Yoke,Magnet and Clamper .2-97.Disassembling the Traverse Unit.2-98.Disassembling the Stepping Motor Unit.2-109.Disassembling the Optical Pickup Unit .2-1010.Disassembling the Nut Unit.2-1111.Disassembling the Sub-Shaft Preload Spring .2-1112.Ass

12、embling the Optical Pickup .2-1113.Disassembling the Spindle Motor Unit .2-1214.Optical Pickup Tilt Adjustment .2-1315.Disassembling the Intermediate Chassis .2-1516.Disassembling the Vertical Cam and Drive Gear .2-1517.Disassembling the Pulley Gear and Deceleration Gear .2-1518.Disassembling the Me

13、chanism Loading C.B.A.2-1519.Lubricating the Optical Pickup and Peripheral parts .2-16ELECTRICAL CONFIRMATION1.Video Output (Luminance Signal) Confirmation .2-172.Video Output (Chrominance Signal) Confirmation .2-173.Video Component Signal (CB) Output Confirmation .2-18SECTION 3ABBREVIATIONS .3-1BLO

14、CK DIAGRAM1.OVERALL BLOCK DIAGRAM .3-32.SERVO BLOCK DIAGRAM .3-43.VIDEO BLOCK DIAGRAM (FOR U, A, R MODELS) .3-54.VIDEO BLOCK DIAGRAM (FOR G, B MODEL) .3-65.AUDIO BLOCK DIAGRAM .3-7INTERCONNECTION DIAGRAM1.U, A, R MODELS .3-82.G, B MODELS .3-9SCHEMATIC DIAGRAM1.POWER SUPPLY SCHEMATIC DIAGRAM (FOR U M

15、ODEL).3-102.POWER SUPPLY SCHEMATIC DIAGRAM (FOR G, B, A MODELS) .3-113.POWER SUPPLY SCHEMATIC DIAGRAM (FOR R MODEL) .3-124.ADSC (MODULE C.B.A. 1/6) SCHEMATIC DIAGRAM .3-135.AV DECODER (MODULE C.B.A. 2/6)SCHEMATIC DIAGRAM (FOR U MODEL) .3-146.AV DECODER (MODULE C.B.A 2/6)SCHEMATIC DIAGRAM (FOR G, B,

16、A, R MODELS).3-157.AUDIO (MODULE C.B.A. 3/6) SCHEMATIC DIAGRAM3-168.FEP (MODULE C.B.A. 4/6) SCHEMATIC DIAGRAM.3-179.CPU (MODULE C.B.A. 5/6) SCHEMATIC DIAGRAM.3-1810.ODC (MODULE C.B.A. 6/6) SCHEMATIC DIAGRAM.3-1911.VIDEO OUT (MOTHER C.B.A. 1/4)SCHEMATIC DIAGRAM (FOR U, A, R MODELS) .3-20 12.VIDEO OUT

17、 (MOTHER C.B.A 1/4)SCHEMATIC DIAGRAM (FOR G, B MODELS) .3-2113.AUDIO OUT1 (MOTHER C.B.A. 2/4) SCHEMATIC DIAGRAM3-2214.AUDIO OUT2 (MOTHER C.B.A. 3/4) SCHEMATIC DIAGRAM.3-2315.OPERATION (MOTHER C.B.A. 4/4) SCHEMATIC DIAGRAM.3-2416.FRONT SW AND POWER SW SCHEMATIC DIAGRAM .3-2517.SCART SCHEMATIC DIAGRAM

18、 (FOR G, B MODELS) .3-26CIRCUIT BOARD DIAGRAM1.POWER SUPPLY C.B.A. (FOR U MODEL) .3-272.POWER SUPPLY C.B.A. (FOR G, B, A MODELS) .3-28 3.POWER SUPPLY C.B.A. (FOR R MODEL) .3-294.MODULE C.B.A. .3-305.MOTHER C.B.A.3-326.FRONT SW AND POWER SW C.B.A. .3-337.SCART C.B.A. (FOR G, B MODELS).3-34EXPLODED VI

19、EWS & REPLACEMENT PARTS LIST1.Electrical Replacement Parts List .4-112.Casing Parts & Mechanism Section.4-133.Loading Mechanism Section .4-154.Traverse Section .4-175.Remote Control Transmitter .4-18SECTION 4RadioFans.CN 收音机爱 好者资料库DVD-S796/S5270DVD-S796/DV-S5270SPECIFICATIONSSignal system: For U mod

20、elNTSCFor G, B, A, R modelsPAL 625/50, PAL 525/60Weight:7lbs. 4oz (3.3kg)Dimensions:17-1/8” (W) 10-7/8” (D) 3-7/8” (H)435 (W) 276 (D) 99 (H) mmOperating temperature range: +50 to +35C (+41 to +95F)Operating humidity range: 5 to 90% (no condensation)Discs played:(1) DVD-VIDEO disc5” (12cm) single-sid

21、ed, single-layer5” (12cm) single-sided, double-layer5” (12cm) double-sided, single-layer3” (8cm)single-sided, single-layer3” (8cm)single-sided, double-layer3” (8cm)double-sided, single-layer(2) Compact disc (CD-DA, VIDEO CD)5” (12cm) disc3” (8cm)discS-video output:Y output level: 1Vp-p (75)C output

22、level: 0.286Vp-p (75)Output connector: S terminal (1 system)Video output:Output level:1Vp-p (75)Output connector: Pin jack (1 system)Compact video output:For U, A, R models onlyY output level:1Vp-p (75), greenPB output level: 0.7Vp-p (75), bluePR output level: 0.7Vp-p (75), redOutput connector: Pin

23、jackAudio output:Output level: 2 Vrms (1kHz, 0dB)Output connector: Pin jackMixed output: 1 systemSubwoofer output: 1 systemAudio signal output characteristics:(1)Frequency response:DVD (linear audio):2Hz to 22kHz (48kHz sampling)2Hz to 44kHz (96kHz sampling)CD audio:2Hz to 20kHz (EIAJ)(2)S/N ratio:C

24、D audio: 115dB (EIAJ)(3)Dynamic range:DVD (linear audio): 102dBCD audio: 98dB (EIAJ)(4)Total harmonic distortion:CD audio: 0.0025% (EIAJ)Digital audio output:Optical digital output: Optical connectorPickup:Wave length:655nmLaser power:CLASS IILaser output:Max. 1.0 mW (Continuous)Color:DVD-S796BUBlac

25、kDV-S5270BUBlackDVD-S796BGBlackDVD-S796TGTitaniumDVD-S796GGGoldDVD-S796BBBlackDVD-S796BABlackDVD-S796GRGoldSpecifications are subject to change without notice.Weight and dimensions are approximate.U . U.S.A. modelG . European modelR . Asian modelB . United Kindom modelA . Australlan modelManufacture

26、d under license from Dolby Laboratories Licens-ing Corporation. “Dolby” and the double-D symbol aretrademarks of Dolby Laboratories Licensing Corporation.LOCALE MANAGEMENT INFORMATIONLocale Management Information: This DVD player is designed and manufactured to respond to the LocaleManagement inform

27、ation that is recorded on a DVD disc. If the Locale number described on the DVD discdoes not correspond to the Locale number of this DVD player, this DVD player cannot play this disc.(See page1-3, REGION CODE.)This product incorporates copyright protection technology that is protected by method clai

28、ms of certainU.S. patents and other intellectual property rights owned by Macrovision Corporation and other rightsowners. Use of this copyright protection techology must be authorized by Macrovision Corporation,and is intended for home and other limited viewing uses only unless otherwise authorized

29、by MacrovisionCorporation. Reverse engineering or disassembly is prohibited.Power requlrements: For U modelAC 120V,60HzFor G, B, A modelsAC 220 240V, 50HzFor R modelAC 110 240V, 50/60HzPower consumption: For U model14W (approx. 2W when set to the standlymode)For G, B, A, R models14W (approx. 4W when

30、 set to the standbymode)SECTION 11 - 1DVD-S796/DV-S5270WARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronicand/or plastic (where applicable) components may also contain traces of chemicals found by theCalifornia He

31、alth and Welfare Agency (and possibly other entities) to cause cancer and/or birth defectsor other reproductive harm.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTHFOR ANY REASON WHATSOEVER!Avoid prolonged, unprotected contact between solder and your skin! When solderi

32、ng, do not inhalesolder fumes or expose eyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash yourhands before handling food.1. Critical Components InformationComponents having special characteristics are marked and must be repl

33、aced with parts having specifications equalto those originally installed.2. Leakage Current Measurement (For 120V Models Only)When service has been completed, it is imperative to verifythat all exposed conductive surfaces are properly insulatedfrom supply circuits.GMeter impedance should be equivale

34、nt to 1500 ohm shuntedby 0.15F.GLeakage current must not exceed 0.5mA.TO SERVICE PERSONNEL1 - 2GBe sure to test for leakage with the AC plug in both polarites.WARNING: Laser SafetyThis product contains a laser beam component. This component may emit invisible, as well as visibleradiation, which may

35、cause eye damage. To protect your eyes and skin from laser radiation, the followingprecautions must be used during servicing of the unit.1) When testing and/or repairing any component within the product, keep your eyes and skin more than30cm away from the laser pick-up unit at all times. Do not star

36、e the laser beam at any time.2) Do not attempt readjustment, disassemble or repair of the laser pick-up, unless notes elsewhere in thismanual.3) CAUTION : Use of controls, adjustments or performance of procedures other than those specifiedherein may result in hazardous radiation exposure.Laser Emitt

37、ing conditions:1) When the Top Cover is removed, and POWER SW is turned to the ON position, the laser componentwill emit a beam for several seconds to detect if a disc is present. During this time (5-10sec.) the lasermay radiate through the lens of the laser pick-up unit. Do not attempt any servicin

38、g during this period!If no disc is detected, the laser will stop emitting the beam. When a disc is set, you will not be exposed toany laser emissions.2) The laser power level can be adjusted with VR on pick-up PWB, however, this level has been set bythe factory prior to shipping from the factory. Do

39、 not adjust this laser level control unless instructionis provided elsewhere in this manual.Adjustment of this control can increase the laser emission level from the device.Laser Diode PropertiesMaterial: GaAlAsLaser output: Max.6mWWavelength: 660676nmANSI Class: Class 1Emission duration: Continuous

40、 * This output is the value measured at a distance of about 200mm from the objective lens surface on the OpticalPick-up Block,DVD-S796/S5270DVD-S796/DV-S5270PREVENTION OF ELECTRO STATIC DISCHARGE (ESD) TOELECTROSTATICALLY SENSITIVE (ES) DEVICESSome semiconductor (solid state) devices can be damaged

41、easily by static electricity. Such components commonly are called ElectrostaticallySensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip”components. The following techniques are used to help reduce the incidence of co

42、mponent damage caused by electro static discharge(ESD).1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touchinga known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, w

43、hich should be removed forpotential shock reasons prior to applying power to the unit under test.2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to preventelectrostatic charge buildup or exposure of the assembly.3.

44、Use only a grounded-tip soldering iron to solder or unsolder ES devices.4. Use only a anti-static solder removal device. Some solder removal devices not classified as “anti-static (ESD protected)” can generateelectrical charge sufficient to damage ES devices.5. Do not use freon-propelled chemicals.

45、These can generate electrical charges sufficient to damage ES devices.6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ESdevices are packaged with leads electrically shorted together by conductive foam, alumi

46、num foil or comparable conductive material).7. Immediately before removing the protective material from the leads of a replacement ES divice, touch the protective material to the chassis orcircuit assembly into which the device will be installed.CAUTION: Be sure no power is applied to the chassis or

47、 circuit, and observe all other safety precautions.8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together ofyour clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) suffic

48、ient to damage an ES device).There are special components used in this equipment which are important for safety.These parts are marked by in the schematic diagrams, exploded views and replacement parts list. It isessential that these critical parts should be replaced with manufacturers specified par

49、ts to prevent shock, fire, orother hazards. Do not modify the original design without permission of manufacturer.IMPORTANT SAFETY NOTICEREGION CODE142562345521 - 3CLASS 1 LASER PRODUCT G, B models G, B modelsVARO!: AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NKYMTTMLLELASER-STEILYLLE. L KA

50、TUO STEESEEN.VARNING! : OSYNIG LASERSTRLNING NR DENNA DEL R PPNAD OCH SPRREN R URKOPPLAD.BETRAKTA EJ STRLEN.DVD-S796/DV-S52701 - 4PRECAUTION OF LASER DIODECAUTION:This unit utilizes a class II laser. Visible laser radiation is emitted from the optical pickup lens when theunit is truned on:1.Do not l