Zenith-XBV342-dvd-sm 维修电路原理图.pdf

SERVICE MANUALProduct Type: DVD+VCRChassis: D35 (DECK), DP5 (MD), DP-7C(MD)Manual Series: XBV342Manual Part #: 3829RGN001VModel Line: CProduct Year: 2003Summary 1Cabinet & Main Chassis2Electrical3Mechanism of VCR Part4Mechanism of DVD Part5Parts List6Published September 2003by Technical PublicationsZenith Electronics Corporation201 James Record RoadHuntsville, Alabama 35824-1513Copyright 2003 by Zenith Electronics CorporationModel Series: CONTENTSABV341XBV342XBV343.RadioFans.CN 收音机爱 好者资料库1-1SECTION 1SUMMARYCONTENTSPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS. 1-2SERVICING PRECAUTIONS. 1-3SPECIFICATIONS. 1-4RadioFans.CN 收音机爱 好者资料库1-2IMPORTANT SAFETY NOTICEThis manual was prepared for use only by properly trained audio-video servicetechnicians.When servicing this product, under no circumstances should the originaldesign 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+VCR covered by thisservice data and its supplements and addends, read and fol-low the SAFETY PRECAUTIONS. NOTE: if unforeseen cir-cumstances create conflict between the following servicingprecautions and any of the safety precautions in this publi-cations, always follow the safety precautions.Remember Safety First:General Servicing Precautions1. Always unplug the DVD+VCR AC power cord from the ACpower source before:(1)Removing or reinstalling any component, circuit board, module, or any other assembly.(2)Disconnecting 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+VCR or anyof its 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+VCR and / or any ofits electrical assemblies unless all solid-state device heatsinks are correctly installed.6. Always connect the test instrument ground lead to anappropriate ground before connecting 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 include Metal panels,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 grounded-tip soldering iron to solder or unsolderES devices.4. Use only an anti-static solder removal device. Somesolder removal devices not classified as “anti-static” cangenerate electrical charges sufficient to damage ES devices.5. Do not use freon-propelled chemicals. These can generate an electrical charge sufficient to damage ESdevices.6. Do not remove a replacement ES device from its protec-tive 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.)1-4SPECIFICATIONSGeneralPower requirementsAC 120V ,60 HzPower consumption23WDimensions (approx.)430 X 97.5 X 293 mm (16.9 x 3.9 x 11.5 inches)(w x h x d)Mass (approx.)4.8 kg (10.58 lbs)Operating temperature 5 C to 40 C (41 F to 104 F)Operating humidity 5 % to 90 %Signal system NTSCInputsANTENNA IN Antenna or CATV input,75 ohmsVHS VIDEO IN 1 Vp-p 75 ohms,sync negative,RCA jack x 1VHS AUDIO IN -6.0 dBm more than 47 ohms,RCA jack (L,R)x 1OutputsVIDEO OUT1 Vp-p 75 ohms,sync negativeS-VIDEO OUT(Y)1.0 V (p-p),75 ohms,negative sync,Mini DIN 4-pin x 1(C)0.3 V (p-p)75 ohmsCOMPONENT VIDEO OUT(Y)1.0 V (p-p),75 ohms,negative sync,RCA jack x 1(Pb)/(Pr)0.7 V (p-p),75 ohms,RCA jack x 2Audio output (digital audio)0.5 V (p-p),75 ohms,RCA jack x 1Audio output (analog audio)2.0 Vrms (1 KHz,0 dB),330 ohms,RCA jack (L,R)x 1RF OUT Channel 3 or 4VCR SpecificationsHead system Four head helical scan azimuth systemTTimer 12-hour display type with AM,PMTape speed SP:33.35 mm/sec,LP:16.67 mm/sec,SLP:11.12 mm/secTape width 12.7 mmMaximum recording time SP:2 HOURS (T-120),SLP:6 HOURS (T-120)/8 HOURS (T-160)Rewind time About 3 minutes (T-120)Antenna 75 ohms (VHF/UHF)VHF output signal Channel 3 or 4 (Switchable)Channel coverage VHF:2-13,UHF:14-69,CATV:1-125 (4A,A-W,W+1 -W+84,A-5 -A-1)Frequency range 20Hz to 20kHzSignal-to-noise ratio More than 43dBDynamic range More than 88 dBChannel separation More than 60 dBDVD SpecificationsLaser system Semiconductor laser,wavelength 650 nmFrequency response DVD (PCM 96 kHz):8 Hz to 44 kHz, DVD (PCM 48 kHz):8 Hz to 22 kHzCD:8 Hz to 20 kHzSignal-to-noise ratio More than 100dB (ANALOG OUT jacks only)Harmonic distortion Less than 0.008%Dynamic range More than 95 dB (DVD/CD)Accessories:Video cable x 1,Audio cable x 1,RF 75-ohm Coaxial Cable x 1,Remote control x 1,Batteries x 2 Design and specifications are subject to change without prior notice.FRONT VIEW (XBV342)2-1SECTION 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 SectionA43A42A49280465250467467467284283LD601300330276260A46A46AA48A00A26285457457457457467467452274452330323OPTIONAL PARTSA54321BCD2-32.Packing Accessory SectionBATTERY808BAG804PACKING803806INSTRUCTION ASSEMBLY CABLE(COAXIAL)810 CABLE ASSY RF801REMOCON900BOX CARTON802PACKING803811812PLUG ASSY 1WAYPLUG ASSY 2WAYOPTIONAL PARTS3-1SECTION 3ELECTRICALCONTENTSOVERALL WIRING DIAGRAM.3-2VCR PARTELECTRICAL ADJUSTMENTPROCEDURES.3-3ELECTRICAL TROUBLESHOOTINGGUIDE.3-41. POWER(SMPS) CIRCUIT.3-42. SYSTEM/KEY CIRCUIT.3-73. SERVO CIRCUIT.3-84. OSD CIRCUIT .3-105. Y/C CIRCUIT .3-116. Hi-Fi CIRCUIT.3-137. Tuner/IF CIRCUIT .3-18BLOCK DIAGRAMS.3-201. Power (SMPS) BLOCK DIAGRAM.3-202. TU/IF BLOCK DIAGRAM.3-223. Y/C BLOCK DIAGRAM.3-244. NORMAL AUDIO BLOCK DIAGRAM .3-265. Hi-Fi BLOCK DIAGRAM.3-286. SYSTEM BLOCK DIAGRAM.3-30CIRCUIT DIAGRAMS.3-321. Power (SMPS) CIRCUIT DIAGRAM .3-322. TU/IF CIRCUIT DIAGRAM.3-343. A/V CIRCUIT DIAGRAM.3-364. Hi-Fi CIRCUIT DIAGRAM.3-385. JACK CIRCUIT DIAGRAM.3-406. SYSTEM CIRCUIT DIAGRAM.3-427. TIMER CIRCUIT DIAGRAM(XBV343).3-448. TIMER CIRCUIT DIAGRAM(XBV342).3-46 WAVEFORMS .3-48 CIRCUIT VOLTAGE CHART .3-50PRINTED CIRCUIT DIAGRAMS.3-521. MAIN P.C.BOARD.3-522. KEY 1(LEFT) P.C.BOARD .3-54 3. KEY 2(RIGHT) P.C.BOARD.3-544. POWER P.C.BOARD .3-56DVD PART(NS MODEL)ELECTRICAL TROUBLESHOOTINGGUIDE.3-581. -COM CIRCUIT.3-582. MPEG CIRCUIT.3-613. RF/Servo CIRCUIT .3-62BLOCK DIAGRAMS.3-661. DVD OVERALL BLOCK DIAGRAM.3-662. RF/CD DSP/DVD DSP/DVD SERVO BLOCKDIAGRAM.3-673. Audio BLOCK DIAGRAM.3-684. MEMORY BLOCK DIAGRAM.3-69CIRCUIT DIAGRAMS.3-701. DVD DSP CIRCUIT DIAGRAM.3-702. DRIVE & RF CIRCUIT DIAGRAM .3-723. MEMORY CIRCUIT DIAGRAM.3-744. INTERFACE CIRCUIT DIAGRAM.3-765. -COM/Expander CIRCUIT DIAGRAM.3-786. Jack CIRCUIT DIAGRAM.3-80 WAVEFORMS .3-82 CIRCUIT VOLTAGE CHART .3-84PRINTED CIRCUIT DIAGRAMS.3-901. MAIN P.C.BOARD (TOP VIEW).3-902. MAIN P.C.BOARD (BOTTOM VIEW).3-92DVD PART(MTK MODEL)ELECTRICAL TROUBLESHOOTINGGUIDE & WAVEFORMS.3-941. SYSTEM OPERATION FLOW.3-942. TEST & DEBUG FLOW.3-95DETAILS AND WAVEFORMS ONSYSTEM TEST AND DEBUGGING.3-1011. SYSTEM 27MHZ CLOCK, RESET, FLASH R/W SIGNAL .3-1012. SDRAM CLOCK.3-1013. TRAY OPEN/CLOS