Zenith-DVB352-dvd-sm 维修电路原理图.pdf

SERVICE MANUALProduct Type: DVD VIDEO PLAYERChassis: DPM-4 (MD)Manual Series: DVB352Manual Part #: 3829RGN002KModel Line: DProduct Year: 2003Summary 1Cabinet & Main Chassis2Electrical3Parts List4Published September 2003by Technical PublicationsZenith Electronics Corporation201 James Record RoadHuntsville, Alabama 35824-1513Copyright 2003 by Zenith Electronics CorporationPrinted in U.S.AModel Series: CONTENTSDVB352.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 Servicing Precautions Insulation Checking Prodedure Electrostatically Sensitive DevicesSPECIFICATIONS. 1-41-21-3IMPORTANT SAFETY NOTICEThis manual was prepared for use only by properly trained audio-video servicetechnicians.When servicing this product, under no circumstances should the originaldesign be 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 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 occasionally 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 without 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 within 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 may 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 FIRE, 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 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 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 physical 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 must 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-FORMER 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 time. 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 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 conditions 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 ventilation.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 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 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-quences 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 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 Precautions1. 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 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, cleanelectrical 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 withwhitch 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 test 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 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 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 component 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 device, 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 assembly.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 cangenerate 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 comparable 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 observe 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 device.)1-4SPECIFICATIONS GENERALPower requirementsAC 120 V, 60 HzPower consumption14W Dimensions (Approx.)440 X 80 X 425 mm (17.3 x 3.1 x 16.7 inches) (w x h x d)Weight (Approx.)5.1 kg (11.2 lbs)Operating temperature5C to 35C (41F to 95F)Operating humidity5 % to 90 % SYSTEMLaser Semiconductor laser, wavelength 650 nmSignal 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 100dB (ANALOG OUT connectors only)Harmonic distortionLess than 0.008%Dynamic rangeMore than 100 dB (DVD)More than 95 dB (CD) OUTPUTSVIDEO OUT1 Vp-p 75 , negative 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 2Audio output (digital audio)0.5 V (p-p), 75 , RCA jack x 1Audio output (analog audio)2.0 Vrms (1 kHz, 0 dB), 600 , RCA jack (L, R) x 1FRONT VIEW (DVB352)2-1SECTION 2CABINET & MAIN CHASSISCONTENTS1. EXPLODED VIEWS.2-21. Cabinet and Main Frame Section.2-22. Packing Accessory Section.2-42-2EXPLODED VIEWS1. Cabinet and Main Frame Section465465250462462300DIG901465261260275463463465467463463463A00A47A46A48A43A42A49283280452452320261A261AA54321BCD2-3 Cabinet and Main Frame Section Cabinet and Main Frame Section Part ListSALLOCA NOLG PART NOADESCRIPTIONSPECIFICATIONREMARKSASSEMBLY PARTS SECTIONA426871R-5097AOPWB(PCB) ASSEMBLY,TOTALDM6000 SH KEY1A433501RF4030LOBOARD ASSEMBLYDVD DM7912NM HA1UZZ FRONTA466885R-0700AOSUB PWB(PCB) ASSEMBLYDM7912NM HA1UZZ 55(U),53(S),00A476871R-6857AOPWB(PCB) ASSEMBLY,TOTALDM7000 POWERA486871R-5096AOPWB(PCB) ASSEMBLY,TOTALDM6000 SH TIMERA496871R-5098BOPWB(PCB) ASSEMBLY,TOTALDM6912N HA1UZZ 5 SLIM KEY2 ZENPARTS SECTION2503111R-D001DOCASE ASSEMBLYDM6912N HA1UZZ TOP2603140R-0056AOCHASSISDVD DM6000 MAIN261A5040R-0069DORUBBERFOOT(SILICONE SPONGE DS-08 T=2754930R-0351AOHOLDERDVD DM6000 BRACKET2803721R-F300LOPANEL ASSEMBLY,FRONTNORMAL PADM7912NM HA1UZZNSPNSP2833581R-T067GODOOR ASSEMBLYDVD DM7912NM HA1UZZ TRAY3006410RAHX02BOPOWER CORDSP-120P/JL001 CHAUS/JULIAN UL/3203720R-D068WOPANEL,VIDEODVD DM7912NM HA1UZZ PRESS BACKSCREW452353-051AOSCREWSPECIAL463353-051GOSCREW,DRAWING+ 2 D3.0 L8.0 MSWR3/FN TB ROUN465353-046KOSCREWSPECIAL (3X10 B.K)467353-046NOSCREW,DRAWINGSPECIAL(3X8 BK.)2614930R-0350AOHOLDER2. Packing Accessory SectionBATTERY808PACKING SHEET804PACKING803811812OWNERS MANUALPLUG ASSY 1WAY(YELLOW)PLUG ASSY 2WAY810CABLE SET ASSY801REMOCON900BOX CARTON802PACKING803806 CABLE, DIN2-4 Packing Accessory Section Part ListSALLOCA NOLG PART NOADESCRIPTIONSPECIFICATIONREMARKS8013835RS0060BOINSTRUCTION ASSEMBLYDVD DM7912NM HA1UZZ8023890R-H819LOBOXDM7921PM HA1UZZ SWM3-A 1.472 48033920R-E063AOPACKING,CASINGDM6000S 0.02 120 EPS 4 615 128804292-053DOBAGLVP-1NSP8066850R-DDA82OCABLE,DINMDC-18-MMBS1-0 S-VHS SM TECH 1808841-0021OBATTERY,MNER03X HI WATT 1.5V .MA/H AAA8106851R-0033AOCABLE ASSEMBLY1WAY(Y) + 2WAY(R/W) 1.8M + S-V8116611R1D003AOPLUG ASSEMBLY1WAY RC1-18RRBS1-0 FREE OF CD8126611R2D003AOPLUG ASSEMBLY2WAY RC2-18RRBS1-0 FREE OF CD_9006711R1N104DOREMOTE CONTROLLER ASSEMBLYN6 NOR DM7912NM HA1UZZ ZENITH3-1SECTION 3ELECTRICALCONTENTSELECTRICAL TROUBLESHOOTING GUIDE.3-21. Power check flow.3-22. System operation flow .3-33. Test & debug flow.3-4DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING.3-101. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL .3-102. SDRAM CLOCK.3-123. TRAY OPEN/CLOSE SIGNAL.3-124. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION).3-145. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION).3-146. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION).3-157. DISC TYPE JUDGEMENT WAVEFORM.3-158. FOCUS ON WAVEFORM.3-179. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION).3-1810. TRACKING CONTROL RELATED SIGNAL(System checking).3-1911. RF WAVEFORM .3-2012. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF).3-2013. MT1379 VIDEO OUTPUT WAVEFORM.3-2114. AUDIO OUTPUT FROM AUDIO DAC .3-22BLOCK DIAGRAMS.3-241. Overall Block Diagram .3-24 2. Power(SMPS) Block Diagram.3-25 3. SERVO Block Diagram.3-26 4. MPEG & MEMORY Block Diagram.3-27 5. VIDEO & AUDIO Block Diagram.3-28CIRCUIT DIAGRAMS.3-291. Power(SMPS) Circuit DIAGRAM.3-292. SYS