Yamaha-DVDS795-dvd-sm 维修电路原理图.pdf

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1、DVD-S795/S705DVD PLAYERDVD-S795/S705SERVICE MANUALFor U, C, B, A, G modelsFor U, C, B, A, G modelsFor U, C, B, A, G modelsFor U, C, B, A, G modelsFor U, C, B, A, G modelsPrinted in Japan100666IMPORTANT NOTICEThis manual has been provided for the use of authorized YAMAHA Retailers and their service p

2、ersonnel.It has been assumed that basic service procedures inherant to the industry, and more specifically YAMAHA Products, arealready known and understood by the users, and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servicing this produ

3、ct may result in personalinjury, destuction of expensive components and failure of the product to perform as specified. For these reasons,we advise all YAMAHA product owners that any service required should be performed by an authorizedYAMAHA Retailer or the appointed service representaive.IMPORTANT

4、: The presentation or sale of this manual to any individual or firm dose not constitute 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

5、(s) indicated on the cover. The reseach, engineering, andservice departments of YAMAHA 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 exis

6、t, please contactthe distributors Service Division.WARNING:Static discharges can destroy expensive components. Dischage any static electricity your body may have accu-mulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss.)IMPORTANT: Turn the unit

7、OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.RadioFans.CN 收音机爱 好者资料库DVD-S795/S705SECTION 1SPECIFICATIONS . 1-1LOCALE MANAGEMENT INFORMATION . 1-1TO SERVICE PERSONNEL . 1-2PREVENTION OF ESD TO ES DEVICES. 1-3PRECAUTION OF LASER DIODE . 1-4HANDILNG

8、PRECAUTIONS FOR TRAVERSE DECK . 1-4REAR PANELS . 1-5OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENT PROCEDURE .1-6SELF-DIAGNOSIS FUNCTION AND SERVICE MODE . 1-7SERVICE PRECAUTIONS . 1-9SERVICE TOOLS AND EQUIPMENT . 1-9OPERATING INSTRUCTIONS . 1-10SECTION 2ASSEMBLING AND DISASSEMBLING THE CASING AND CH

9、ECKINGC. B. A.s1. Disassembly Procedure . 2-12. Casing Parts and C.B.A. Positions . 2-23. 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 . 2-38. Checking the Module C.B.A. . 2-49. D

10、isassembling the Rear Panel. 2-410. Checking the Power Supply C.B.A. . 2-511. Checking the Mother C.B.A. . 2-512. Checking the Power Switch C.B.A. . 2-513. Checking the Front Switch C.B.A. 2-514. Checking the Headphone C.B.A. . 2-5ASSEMBLING AND DISASSEMBLING THE OPTICAL PICKUP1. Handling the Optica

11、l Pickup . 2-62. Disassembly Procedure . 2-63. Lubricating the Loading Base Unit . 2-74. Static Electricity Countermeasures . 2-85. Disassembling the Clamp Base Unit. 2-96. Disassembling the Clamp Weight, Clamper Yoke,Magnet and Clamper . 2-97. Disassembling the Traverse Unit . 2-98. Disassembling t

12、he 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. Assembling the Optical Pickup . 2-1113. Disassembling the Spindle Motor Unit . 2-1214. Optical Pickup Tilt Adjustment. 2-1315. Disa

13、ssembling 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 Mechanism Loading C.B.A. . 2-1519. Lubricating the Optical Pickup and Peripheral parts . 2-16ELECTRICAL ADJUSTMENT1. Vid

14、eo Output (Luminance Signal) Adjustment . 2-172. Video Output (Chrominance Signal) Adjustment . 2-173. Video Component Signal (CB) Output Adjustment . 2-18SECTION 3ABBREVIATIONS . 3-1BLOCK DIAGRAM1. OVERRALL BLOCK DIAGRAM . 3-32. SERVOBLOCK DIAGRAM. 3-53. VIDEO BLOCK DIAGRAM . 3-74. AUDIO BLOCK DIAG

15、RAM . 3-9SCHEMATIC DIAGRAM1.POWER SUPPLY SCHEMATIC DIAGRAM (FOR U, C MODELS) .3-112.POWER SUPPLY SCHEMATIC DIAGRAM (FOR B, G, A MODELS)3-133. ADSC (MODULE C.B.A. 1/8) SCHEMATIC DIAGRAM . 3-154. SERVO (MODULE C.B.A. 2/8) SCHEMATIC DIAGRAM. 3-175.AV DECODER (MODULE C.B.A. 3/8) SCHEMATIC DIAGRAM .3-196

16、. VDAC (MODULE C.B.A. 4/8) SCHEMATIC DIAGRAM . 3-217. FEP (MODULE C.B.A. 5/8) SCHEMATIC DIAGRAM . 3-238. CPU (MODULE C.B.A. 6/8) SCHEMATIC DIAGRAM. 3-259. CLOCK (MODULE C.B.A. 7/8) SCHEMATIC DIAGRAM . 3-2710. ODC (MODULE C.B.A. 8/8) SCHEMATIC DIAGRAM . 3-2911. VIDEO (MODULE C.B.A. 1/5) SCHEMATIC DIA

17、GRAM . 3-3112.ADAC C (MODULE C.B.A. 2/5) SCHEMATIC DIAGRAM.3-3313.AUDIO AC-3 (MODULE C.B.A. 3/5) SCHEMATIC DIAGRAM .3-3514.AUDIO OUT (MODULE C.B.A. 4/5) SCHEMATIC DIAGRAM.3-3715.OPERATION (MODULE C.B.A. 5/5) SCHEMATIC DIAGRAM.3-3916.VIDEO COMP SCHEMATIC DIAGRAM (FOR U, C MODELS). 3-4117. SCART SCHEM

18、ATIC DIAGRAM (FOR B, G MODELS) . 3-4318.FRONT SW/HEAD PHONE/POWER SW SCHEMATIC DIAGRAM .3-45CIRCUIT BOARD DIAGRAM1. POWER SUPPLY C.B.A. (FOR U, C MODELS) . 3-472. POWER SUPPLY C.B.A. (FOR B, G, A MODELS) . 3-493. MODULE C.B.A. . 3-514. MOTHER C.B.A. . 3-555. FRONT SW/HEAD PHONE/POWER SW C.B.A. . 3-5

19、76. SCART C.B.A. (FOR B, G MODELS). . 3-597. VIDEO COMP C.B.A. (FOR U, C MODELS) . 3-61SECTION 4EXPLODED VIEWS & REPLACEMENT PARTS LIST1. ELECTRICAL REPLACEMENT PARTS LIST . 4-12. Casing Parts & Mechanism Section. 4-183. Loading Mechanism Section . 4-214. Traverse Section . 4-235. REMOTE CONTROL TRA

20、NSMITTER. 4-25CONTENTSRadioFans.CN 收音机爱 好者资料库DVD-S795/S7051 - 1SECTION 1SPECIFICATIONSPower requlrements: For U, C modelsAC 120V,60HzFor B, A, G modelsAC 220 240V, 50HzPower consumption:For U, C models19W (approx. 1W when set to the standlymode)For B, G models20W (approx. 2.5W when set to the standb

21、ymode)For A models19W (approx. 2W when set to the standby mode)Signal system:For U, C modelsNTSCFor B, A, G modelsPAL 625/50, PAL 525/60, NTSCWeight:7.9lbs. (3.6kg)For G:Gold model only4.2kgDimensions:17-3/16” (W) 3-15/16” (H) 10-3/8” (D)435 (W) 100 (H) 263 (D) mmFor G:Gold model only473 (W) 100 (H)

22、 263 (D) mm(excluding protrusions)Operating temperature range:+5 to +35C (+41 to +95F)Operating humidlty range:5 to 90% (no condensation)Discs played:(1) DVD-VIDEO disc5” (12cm) single-sided, single-layer5” (12cm) single-sided, double-layer5” (12cm) double-sided, single-layer3” (8cm)single-sided, si

23、ngle-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:For U, C modelsY output level: 1Vp-p (75)(NTSC)C output level: 0.286Vp-p (75)(NTSC)Output connector: S terminal (1 system)For B, A, G modelsY outpu

24、t level: 1Vp-p (75)C output level: 0.286Vp-p (75) (PAL)For B, G modelsOutput connector: S terminal (1 system) / AV1For A modelOutput connector: S terminal (1 system)Video output:Output level:1Vp-p (75)For U, C, A modelsOutput connector: Pin jack (2 systems)For B,G modelsOutput connector: Pin jack (2

25、 systems)/AV1/AV2Compact video output:For U, C models onlyY output level: 1Vp-p (75), greenCB output level: 0.7Vp-p (75), blueCR output level: 0.7Vp-p (75), redOutput connector: Pin jackAudio output:Output level: 2 Vrms (1kHz, 0dB)Output connector: Pin jack5.1ch mixed output: 1 system (2ch)5.1ch dis

26、crete output: 1 system (5.1ch)Audio 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:CD audio: 115dB (EIAJ)(3) Dynamic range:DVD (linear audio): 103dBCD audio: 100dB (EIAJ)(4) T

27、otal harmonic distortion:CD audio: 0.002% (EIAJ)Digital audio output:Optical digital output:Optical connectorCoaxial digital output: Pin jackPick up:Wave length:655nmLaser power:CLASS IISpecifications are subject to change without notice.Weight and dimensions are approximate.U . U.S.A. modelG . Euro

28、pean modelC . Canadial modelB . United Kindom modelA . Australlan modelManufactured 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

29、 DVD player is designed and manufactured to respond to the LocaleManagement information 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 pro

30、duct incorporates copyright protection technology that is protected by method claims of certainU.S. patents and other intellectual property rights owned by Macrovision Corpoation and other rightsowners. Use of this copyright protection techology must be authorized by Macrovision Corporation,and is i

31、ntended for home and other limited viewing uses only unless otherwise authorized by MacrovisionCorporation. Reverse engineering or disassembly is prohibited.DVD-S795/S7051 - 2TO SERVICE PERSONNEL1. Critical Components Information.Components having special characteristics are marked and must be repla

32、ced 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.Meter impedance should be equivalen

33、t to 1500 ohm shuntedby 0.15mF.Leakage current must not exceed 0.5mA.Be sure to test for leakage with the AC plug in both polarites.CAUTION: USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THANTHOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.THE COMAPCT DISC PLAYER

34、 SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLYQUALIFIED SERVICE PERSONNEL.PROTECTION OF EYES FROM LASER BEAM DURING SERVICINGThis set employs a laser. Therefore, be sure to carefullyfollow the instructions below when servicing.1. Pick upWave length: 655nmLaser power: CLASS II2. When c

35、hecking the laser diode emission, keep your eyesmore than 30 cm away from the objective lens.WARNING: 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

36、of chemicals found by theCalifornia Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defectsor other reproductive harms.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTHFOR ANY REASON WHATSOEVER!Avoid prolonged, unprotected contact bet

37、ween solder and your skin! When soldering, 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 bofore handing food.DVD-S795/S7051 - 3PREVENTION OF ELECTRO STATIC DISCHARGE (ESD) TO

38、ELECTROSTATICALLY SENSITIVE (ES) DEVICESSome semiconductor (solid state) devices can be damaged 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 semi

39、conductor “chip”components. The following techniques be used to help reduce the incidence of component 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

40、ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which 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

41、suck as alminum foil, to preventelectrostatic charge buildup or exposure of the assembly.3.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 generatee

42、lectrical charge sufficient to damage ES devices.5.Do not use freon-propelled chemicals. 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 E

43、Sdevices are packaged with leads electrically shorted together by conductive foam, alminum 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 whi

44、ch the device will be installed.CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.8.Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise hamless motion such as the brushing together ofyour clothes fabric or the lif

45、ting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).IMPORTANT SAFETY NOTICEThere are special components used in this equipment which are imporant for safety.These parts are marked by in the schematic diagrams, exploded views and replacemen

46、t parts list. It isessential that these critical parts should be replaced with manufacturers specified parts to prevent shock, fire, orother hazards. Do not modify the original design without permission of manufacturer.REGION CODE14256234552DVD-S795/S7051 - 4PRECAUTION OF LASER DIODECAUTION:This uni

47、t utilizes a class I laser. Invisible laser radiation is emitted from the optical pickup lens when theunit is truned on:1.Do not look directly into the pickup lens.2.Do not use optical instruments to look at the pickup lens.3.Do not adjust the preset variable resistor on the optical pickup.4.Do not

48、disassemble the optical pickup unit.5.If the optical pickup is replaced, use the manufactures specified replacement pickup only.6.Use of control or adjustment or performance of procedures other than those specified herin may result in hazardousradiation exposure.HANDLING PRECAUTIONS FOR TRAVERSE DEC

49、KThe laser diode in the optical pickup may break down due topotentical diference caused by static electricity of clothes orhuman body.So be careful of electrostatic break down during repair of theoptical pickup.Handling of optical pickup1.Do not subject the optical pickup to static electricityas it

50、is extremely sensitive to electrical shock.2.To prevent the breakdown of the laser diode,an antistatic shorting pin is inserted into theflexible board (FPC Board).When removing or connecting the short pin,finish the job in as short times as possible.3.Be careful not to apply excessive stress to thef