Loewe-Centros1272-dvd-sm 维修电路原理图.pdf

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1、SERVICEANLEITUNG DVD Recorder Service Manual. Manuel de Service. Manuale di Servizio. Instrucciones de servicio. Service-instructies. 230- 90434.934 CENTROS 1202 / CENTROS 1272 CENTROS 1202 Art.-Nr. 65501 CENTROS 1272 Art.-Nr. 65511 RadioFans.CN 收音机爱 好者资料库CONTENTSSECTION 1 . . . . SUMMARYSECTION 2 .

2、 . . . CABINET & MAIN CHASSISSECTION 3 . . . . ELECTRICALSECTION 4 . . . . PARTS LISTRadioFans.CN 收音机爱 好者资料库1-1SECTION 1SUMMARYCONTENTSNEW FUNCTIONS OF DVD-RECORDER. 1-2PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS. 1-3SERVICING PRECAUTIONS. 1-4 General Servicing Precautions Insulation Chec

3、king Prodedure Electrostatically Sensitive DevicesSERVICE INFORMATION FOR EEPROM IC SETTING. 1-5SPECIFICATIONS. 1-61-2NEW FUNCTIONS OF DVD-RECORDER SUMMARY OF PRODUCT- RECORDING FUNCTION OF DVD-RW AND DVD-R SPECIFICATIONS DVD-RW: VIDEO MODE AND VR MODE RECORD AVAILABLE DVD-R :VIDEO MODE RECORD AVAIL

4、ABLE - DIGITAL DUBBING FUNCTION OF DV CAMCORDER BY USING DV TERMINAL (IEEE1394) RECORD, PLAY, FF/REW FUNCTION BY REMOTE CONTROL OF DV CAMCORDER - DVD PROGRESSIVE PLAY RESPONSE- VARIOUS FUNCTION RESPONSE OF DVD RECORDING (DISC NAVIGATION AND CONVENIENT PLAY,EDIT FUNCTION)- OUTSIDE INPUT AND TV RECORD

5、ING AVAILABLE RECORDING SCREEN QUALITY :VR(HQ, SQ, LQ), VIDEO(HQ, SQ)- TV RESERVE RECORDING FUNCTION (AUTO MODE SETTING AVAILABLE FOR RECORDING INACCORDANCE WITH THE REMAINING DISC SPACE IN RESERVATION) SUMMARIZED EXPLANATION OF MAIN FUNCTION DVD RECORDING FUNCTION(VR MODE RECORD / VIDEO MODE RECORD

6、)1) VR MODE RECORD : MANUAL MODE RECORDING IN ACCORDANCE WITH VARIOUS EDITING FUNC-TION, REMAINING DISC SPACE AND PROGRAM TIME DVD-RW DISC RECORDED IN THE VR MODECAN BE PLAYED WITH A DVD PLAYER CORRESPONDING TO THE DVD-RW THERE IS ALSO A PLAY-ER TO BE PLAYED THROUGH FINALIZING. FOR THE DVD-RW, RECOR

7、DING AND EDITING IS AVAIL-ABLE AT THE SAME DEVICE EVEN AFTER FINALIZING.2) VIDEO MODE RECORDING : THERE IS NO EDITING FUNCTION SUCH AS VR MODE RECORDINGBUT VIDEO MODE RECORDING IS PLAYED IN A GAME DEVICE (FOR EXAMPLE, “PLAY STATION 2”)WITH PC, DVD PLAY FUNCTION CORRESPONDING TO DVD PLAYER, CAR DVD,

8、DVD-ROM. TO PLAYIN ANOTHER DEVICE, FINALIZING IS REQUIRED. RECORDING, EDITING AND EDITING IS NOT POS-SIBLE AFTER FINALIZING. HOWEVER, RECORDING IS ALLOWED AT THE DVD-RW DISC IF ERASINGTHE TITLE FINALLY RECORDED AFTER FINALIZING.3) RECORDING MODE INITIALIZATION (A KIND OF FORMATTING): BEGINS INITIALI

9、ZATION AFTERSELECTING RECORDING MODE AS VR OR VIDEO MODE BY USING INITIALIZATION FUNCTION OFTHE DISC SETTING MENU. INITIALIZES DEFAULT AS VR MODE FOR DVD-RW. RECORDS IT ASVIDEO MODE WITHOUT INITIALIZATION FOR VIDEO MODE.4) FINALIZE: BEGINS FINALIZE AT THE DISC SETTING MENU DURING STOP.1-3IMPORTANT S

10、AFETY 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 LOEWE ElectronicsCorporation. All components should be replaced only with

11、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 t

12、heir compo-nent designators and are required to maintain safe performance. No deviationsare allowed without prior approval by LOEWE Electronics Corporation.Circuit diagrams may occasionally differ from the actual circuit used. This way,implementation of the latest safety and performance improvement

13、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

14、 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 literatu

15、re.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

16、 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 isol

17、ation 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

18、-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.

19、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

20、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 cabine

21、t (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

22、 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

23、 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 INSTALL

24、ATION1. 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 leakag

25、e 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

26、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. Cautio

27、n 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 threshold

28、s 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 W

29、aterPipe, Conduit, etc.0.15uFPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS1-4SERVICING PRECAUTIONSCAUTION : Before servicing the DVD Recorder covered bythis service data and its supplements and addends, read andfollow the SAFETY PRECAUTIONS. NOTE : if unforeseencircumstances create conflict

30、 between the following servic-ing precautions and any of the safety precautions in this pub-lications, always follow the safety precautions.Remembers Safety First:General Servicing Precautions1. Always unplug the DVD Recorder AC power cord from theAC power source before:(1)Removing or reinstalling a

31、ny 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

32、 electrolytic capacitors may resultin an explosion hazard.2. Do not spray chemicals on or near this DVD Recorder orany of 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 clean

33、er,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

34、DVD Recorder and/or anyof its electrical assemblies unless all solid-state deviceheat sinks 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

35、 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 t

36、han 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 (E

37、S) 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 c

38、ompo-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 un

39、it 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

40、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

41、 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 fromt

42、he 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 rep

43、lacement 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.)1-5SERVICE INFORMATION FOR EEPROM IC SETTINGMICOM STARTYesYesYesNoYesNoEEPROM ID CH

44、ECK2 BYTE(B3,248,249)ID OK?B3, 230, 231(A20,03)OPTION DATA READ5TIME & COMPAREMICOM NORMALOPERATION START* EEPROM INITIAL *- SETUP is displayed in the field if pressing the Front “SCAN-” Key with the Remocon ENDkey pressed in the status of powering on.- AUTO SEARCH is done since the initial screen o

45、f ACMS is serviced if powering on.OPTION CONFIRMATION MODEPress the END key onthe Remote controller andthe SCAN - key one theFront Panel the sametime, then it goes in toTracking initial mode.OPTION condition of Present timethe CHECK There is a Possibility ofdoing and the OPTION the REWRITEit is poss

46、ible.GENTROS 1202 NAME HEX BINARYOPT1 D8 00000000OPT2 61 00000000OPT3 31 00000000OPT4 C3 00000000OPT5 0A 00000000OPT6 AC 00000000OPT7 E4 00000000OPT8 C5 00000000GENTROS 1272 NAME HEX BINARYOPT1 D8 00000000OPT2 61 00000000OPT3 60 00000000OPT4 C1 00000000OPT5 4A 00000000OPT6 AC 00000000OPT7 E6 0000000

47、0OPT8 D2 00000000WRITE:OKEXIT : MPMOVE:EDIT :MASK : 40 , EEP : FF, , D47( Each mask ,eeprom, It shows a development release version.)1-6SPECIFICATIONS GENERALPower requirementsAC 200-240V, 50/60 HzPower consumption44W Dimensions (approx.)430 X 92 X 382.5 mm (16.9 x 3.6 x 15 inches) (w x h x d)Mass(a

48、pprox.)6.4 kg (14.1 lbs)Operating temperature5C to 35C (41F to 95F)Operating humidity5 % to 90 %Television systemPAL B/G colour systemRecording formatPAL RECORDINGRecording formatDVD VideoRecording, DVD-VIDEORecordable discsDVD-ReRecordable, DVD-RecordableRecordable timeApprox. 1 hour (HQ mode), 2 h

49、ours (SQ mode), 4 hours (LQ mode)Video recording formatSampling frequency27MHzCompression formatMPEG 2Audio recording formatSampling frequency48kHzCompression formatDolby Digital DVD SPECIFICATIONSLaser systemSemiconductor laserFrequency responseDVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHzSi

50、gnal-to-noise ratioMore than 100 dBHarmonic distortionLess than 0.008%Dynamic rangeMore than 95 dB INPUTSAERIAL INAerial input, 75 ohmsVIDEO IN1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 / SCARTAUDIO IN0 dBm more than 47 kohms, RCA jack (L, R) x 2 / SCARTDV IN4 pin (i.LINK/IEEE 1394 standard) OUTP