Zenith-DVB318-dvd-sm 维修电路原理图.pdf

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1、SERVICE MANUALProduct Type: DVD VIDEO PLAYERChassis: DP7 (MD)Manual Series: DVB318Manual Part #: 3829RHN004AModel Line: DProduct Year: 2003Summary ? 1Cabinet & Main Chassis?2Electrical?3Mechaunism?4Parts List?5Published September 2003by Technical PublicationsZenith Electronics Corporation201 James R

2、ecord RoadHuntsville, Alabama 35824-1513Copyright 2003 by Zenith Electronics CorporationPrinted in U.S.AModel Series: CONTENTSDVB318.RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库1-1SECTION 1SUMMARYCONTENTSPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS. 1-2SERVICING PRECAUTIONS. 1-3 General

3、Servicing Precautions Insulation Checking Prodedure Electrostatically Sensitive DevicesSPECIFICATIONS. 1-41-2IMPORTANT SAFETY NOTICEThis manual was prepared for use only by properly trained audio-video servicetechnicians.When servicing this product, under no circumstances should the originaldesign b

4、e modified or altered without permission from Zenith ElectronicsCorporation. All components should be replaced only with types identical tothose in the original circuit and their physical location, wiring and lead dressmust conform to original layout upon completion of repairs.Special components are

5、 also used to prevent x-radiation, shock and fire haz-ard. These components are indicated by the letter “x” included in their compo-nent designators and are required to maintain safe performance. No deviationsare allowed without prior approval by Zenith Electronics Corporation.Circuit diagrams may o

6、ccasionally differ from the actual circuit used. This way,implementation of the latest safety and performance improvement changesinto the set is not delayed until the new service literature is printed.CAUTION: Do not attempt to modify this product in any way. Never performcustomized installations wi

7、thout manufacturers approval. Unauthorized modi-fications will not only void the warranty, but may lead to property damage oruser injury.Service work should be performed only after you are thoroughly familiar withthese safety checks and servicing guidelines.GRAPHIC SYMBOLSThe exclamation point withi

8、n an equilateral triangle is intended toalert the service personnel to important safety information in theservice literature.The lightning flash with arrowhead symbol within an equilateral tri-angle is intended to alert the service personnel to the presence ofnoninsulated “dangerous voltage” that ma

9、y be of sufficient magni-tude to constitute a risk of electric shock.The pictorial representation of a fuse and its rating within an equi-lateral triangle is intended to convey to the service personnel thefollowing fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISKOF FIR

10、E, REPLACE ALL FUSES WITH THE SAME TYPE ANDRATING AS MARKED NEAR EACH FUSE.SERVICE INFORMATIONWhile servicing, use an isolation transformer for protection from AC line shock.After the original service problem has been corrected, make a check of the fol-lowing:FIRE AND SHOCK HAZARD1. Be sure that all

11、 components are positioned to avoid a possibility of adjacentcomponent shorts. This is especially important on items trans-ported to andfrom the repair shop.2. Verify that all protective devices such as insulators, barriers, covers, shields,strain reliefs, power supply cords, and other hardware have

12、 been reinstalledper the original design. Be sure that the safety purpose of the polarized lineplug has not been defeated.3. Soldering must be inspected to discover possible cold solder joints, soldersplashes, or sharp solder points. Be certain to remove all loose foreign par-ticles.4. Check for phy

13、sical evidence of damage or deterioration to parts and compo-nents, for frayed leads or damaged insulation (including the AC cord), andreplace if necessary.5. No lead or component should touch a high current device or a resistor ratedat 1 watt or more. Lead tension around protruding metal surfaces m

14、ust beavoided.6. After reassembly of the set, always perform an AC leakage test on allexposed metallic parts of the cabinet (the channel selector knobs, antennaterminals, handle and screws) to be sure that set is safe to operate withoutdanger of electrical shock. DO NOT USE A LINE ISOLATION TRANS-FO

15、RMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms pervolt or more sensitivity in the following manner: Connect a 1500 ohm, 10watt resistor, paralleled by a .15 mfd 150V AC type capacitor between aknown good earth ground water pipe, conduit, etc.) and the exposed metal-lic parts, one at a t

16、ime. Measure the AC voltage across the combination of1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using anon-polarized adaptor and repeat AC voltage measurements for eachexposed metallic part. Voltage measured must not exceed 0.75 volts RMS.This corresponds to 0.5 milliamp AC. Any

17、 value exceeding this limit consti-tutes a potential shock hazard and must be corrected immediately.TIPS ON PROPER INSTALLATION1. Never install any receiver in a closed-in recess, cubbyhole, or closely fittingshelf space over, or close to, a heat duct, or in the path of heated air flow.2. Avoid cond

18、itions of high humidity such as: outdoor patio installations wheredew is a factor, near steam radiators where steam leakage is a factor, etc.3. Avoid placement where draperies may obstruct venting. The customershould also avoid the use of decorative scarves or other coverings thatmight obstruct vent

19、ilation.4. Wall- and shelf-mounted installations using a commercial mounting kit mustfollow the factory-approved mounting instructions. A product mounted to ashelf or platform must retain its original feet (or the equivalent thickness inspacers) to provide adequate air flow across the bottom. Bolts

20、or screwsused for fasteners must not touch any parts or wiring. Perform leakage testson customized installations.5. Caution customers against mounting a product on a sloping shelf or in a tilt-ed position, unless the receiver is properly secured.6. A product on a roll-about cart should be stable in

21、its mounting to the cart.Caution the customer on the hazards of trying to roll a cart with small cast-ers across thresholds or deep pile carpets.7. Caution customers against using extension cords. Explain that a forest ofextensions, sprouting from a single outlet, can lead to disastrous conse-quence

22、s to home and family.A.C. Voltmeter1500 OHM10 WATTPlace this probeon each exposedmetal part.Good Earth Groundsuch as the WaterPipe, Conduit, etc.0.15uFPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS1-3SERVICING PRECAUTIONSCAUTION : Before servicing the DVD covered by this servicedata and its

23、supplements and addends, read and follow theSAFETY PRECAUTIONS. NOTE : if unforeseen circum-stances create conflict between the following servicing pre-cautions and any of the safety precautions in this publica-tions, always follow the safety precautions.Remembers Safety First:General Servicing Prec

24、autions1. Always unplug the DVD AC power cord from the ACpower source before:(1)Removing or reinstalling any component, circuit board, module, or any other assembly.(2)Disconnection or reconnecting any internal electricalplug or other electrical connection.(3)Connecting a test substitute in parallel

25、 with an elec-trolytic capacitor.Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may resultin an explosion hazard.2. Do not spray chemicals on or near this DVD or any ofits assemblies.3. Unless specified otherwise in this service data, cleanelectrica

26、l contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner,cotton-tipped swab, or comparable soft applicator.Unless specified otherwise in this service data, lubricationof contacts is not required.4. Do not defeat any plug/socket B+ voltage interlocks withwhi

27、tch instruments covered by this service manual mightbe equipped.5. Do not apply AC power to this DVD and/or any of itselectrical assemblies unless all solid-state device heatsinks are cerrectly installed.6. Always connect test instrument ground lead to theappropriate ground before connection the tes

28、t instrumentpositive lead. Always remove the test instrument ground lead last.Insulation Checking ProcedureDisconnect the attachment plug from the AC outlet and turnthe power on. Connect an insulation resistance meter(500V)to the blades of the attachment plug. The insulation resis-tance between each

29、 blade of the attachment plug and acces-sible conductive parts (Note 1) should be more than 1M-ohm.Note 1 : Accessible Conductive Parts including Metal pan-els, Input terminals, Earphone jacks, etc.Electrostatically Sensitive (ES) DevicesSome semiconductor (solid state) devices can be damagedeasily

30、by static electricity. Such components commonly arecalled Electrostatically Sensitive (ES) Devices. Examples oftypical ES devices are integrated circuits and some fieldeffect transistors and semiconductor chip components.The following techniques should be used to help reduce theincidence of componen

31、t damage caused by static electricity.1. Immediately before handling any semiconductor compo-nent or semiconductor-equipped assembly, drain off anyelectrostatic charge on your body by touching a knownearth ground. Alternatively, obtain and wear a commer-cially available discharging wrist strap devic

32、e, which should be removed for potential 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 prevent electrostatic charge buildup or exposure of the assemb

33、ly.3. Use only a grouned-tip soldering iron to solder or unsolderES devices.4. Use only an anti-static solder removal device. Somesolder removal devices not classified a “anti-static” cangenerate electrical charges sufficient to damage ES devices.5. Do not use freon-propelled chemicals. These cangen

34、erate electrical charge sufficient to damage ESdevices.6. Do not remove a replacement ES device from its protective package until immediately before you are ready toinstall it. (Most replacement ES devices are packaged withleads electrically shorted together by conductive foam,aluminum foil, or comp

35、arable conductive material).7. Immediately before removing the protective material fromthe leads of a replacement ES device, touch the protectivematerial to the chassis or circuit assembly into which thedevice will be installed.Caution : Be sure no power is applied to the chassis orcircuit, and obse

36、rve all other safety precautions.8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the liftingof your foot from a carpeted floor can generate static elec-tricity sufficient to damage an ES dev

37、ice.)1-4SPECIFICATIONS GENERALPower requirementsAC 120 V , 60 HzPower consumption14W Dimensions (Approx.)430 x 48 x 242 mm (16.9 x 1.9 x 9.5 inches) (W x H x D)Weight (Approx.)2.34 kg (5.2 lbs)Operating temperature5 C to 35 C (41 F to 95 F)Operating humidity5 % to 90 % SYSTEMLaser Semiconductor lase

38、rSignal systemNTSCFrequency responseDVD (PCM 96 kHz): 8 Hz to 44 kHz DVD (PCM 48 kHz): 8 Hz to 22 kHzCD: 8 Hz to 20 kHzSignal-to-noise ratioMore than 100 dB (ANALOG OUT connectors only)Harmonic distortionLess than 0.008%Dynamic rangeMore than 90 dB (DVD/CD) OUTPUTSVIDEO OUT1.0 V (p-p), 75 , negative

39、 sync, RCA jack x 1S-VIDEO OUT(Y) 1.0 V (p-p), 75 , negative sync, Mini DIN 4-pin x 1(C) 0.3 V (p-p) 75 COMPONENT VIDEO OUT(Y) 1.0 V (p-p), 75 , negative sync, RCA jack x 1(Pb)/(Pr) 0.7 V (p-p), 75 , RCA jack x 2 (480p, 720p, 1080i)DVI-D DIGITAL OUTDVI-D Single Link connector x 1 (480p, 720p, 1080i)

40、Digital Audio output (Coaxial)0.5 V (p-p), 75 , RCA jack x 1Digital Audio output (Optical)3.0 V (p-p), 75 , Optical connector x 1Analog Audio output2.0 Vrms (1 kHz, 0 dB), 600 , RCA jack (L, R) x 1 ACCESSORIESComponent video cable1DVI-type cable1S-Video cable1Video cable1Audio cable1Remote control1B

41、atteries22-1SECTION 2CABINET & MAIN CHASSISCONTENTS1. EXPLODED VIEWS.2-21. Cabinet and Main Frame Section.2-22. Packing Accessory Section.2-32-2EXPLODED VIEWS1. Cabinet and Main Frame Section463463250A00463463300283280A47A47AA48A44A43A50A46260261261463320463467463465452SCART&5.1CHMODELONLYOPTIONAL P

42、ARTA54321BCD2-32. Packing Accessory SectionBATTERY808PACKING SHEET804PACKINGOPTIONAL PARTS803806OWNERS MANUALCABLE DIN810CABLE ASSY801REMOCON900BOX CARTON802PACKING803811812PLUG ASSY(1WAY(YELLOW)814CABLE, COAXIAL(DVI CABLE MOLEX)815CABLE, COAXIAL(3WAY RCA COMPONENT)PLUG ASSY(2WAY)3-1SECTION 3ELECTRI

43、CALCONTENTSELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS. 3-21. System Clock X501 (27Mhz).3-22. Initializing between MPEG and SDRAM.3-23. Initializing between MPEG(FLI2301B) and Flash .3-34. Sil170B is nitialized by M-Reset and D-Reset .3-35. Reference Voltage 1.3-36. Reference Voltage 2.3-47. Checki

44、ng the initial step of M/D Assy.3-48. Checking the Video Signal.3-59. Checking the first step of servo (1).3-510. Checking the second step of servo (2).3-611. Checking the output of Audio signal.3-612. Checking the reset port.3-713. Checking the focus & tracking servo.3-714. Checking the track jump

45、.3-815. The status of CD_LD and DVD_LD in the PLAY MODE.3-816. The status Focus and spindle motor.3-917. DATA STREAM.3-918. Input Clock to IC202.3-1019. Tray Open and Close .3-1020. Focus Drive signal(FACT).3-1121. Signals for Front micom.3-1122. FACT and FE for DVD9 (Dual disc).3-1223. System clock

46、 of MPEG IC .3-1224. 480P.3-1325. 720P.3-1326. 1080i .3-14BLOCK DIAGRAMS. 3-151. DVD Overall Block Diagram.3-15 2. POWER Block Diagram .3-16 3. SERVO Block Diagram.3-17 4. MPEG Block Diagram .3-18 5. GENESIS & DVI BLOCK Diagram .3-19 6. AUDIO Block Diagram.3-20CIRCUIT DIAGRAMS. 3-211. Power(SMPS) Ci

47、rcuit DIAGRAM .3-212. RF & SERVO Circuit DIAGRAM.3-233. SYSTEM Circuit DIAGRAM.3-254. AUDIO & JACK Circuit DIAGRAM.3-275. Timer/5.1CH Circuit DIAGRAM.3-296. DVI Circuit DIAGRAM.3-31 CIRCUIT VOLTAGE CHART.3-33PRINTED CIRCUIT DIAGRAMS. 3-311. MAIN P.C.BOARD (TOP VIEW) .3-39 2. MAIN P.C.BOARD (BOTTOM V

48、IEW).3-413. KEY P.C.BOARD .3-434. TIMER P.C.BOARD .3-435. POWER(SMPS) P.C.BOARD .3-456. DVI P.C.BOARD.3-463-2ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMSIC501X501MPEG(STI5589)NORMAL1) MPEG IC start oscilatingafter being installed VCCABNORMAL1) Logo Picture doesnt appear2) Initial step fail* Initial

49、step : power cord in - green LED -OFF - power key input - Logo picture6.5 Vp-pX501 : 27 MhzX501 : there is distortionIC502SDRAMFront-comX501/M-RESETSMI_CLKL507IC501MPEG(STI5589)1) MPEG IC start oscilating(27Mhz)after beinginstalled VCC2) MPEG IC and DSP IC get the /M - RESET sig-nal from front -com

50、and they are initialized.3) And then, MPEG IC generate SMI_CLK andsend to SDRAM4) MPEG IC and SDRAM are synchronized bySMI_CLK, they communicate between.If oscilation(27Mhz) dont appear, checkThe X-TAL and VCC and replace MPEG IC.If SMI_CLK dont appear, first cut the SMI_CLKline (remove L507) and re