LG-LRM519-mr-sm 维修电路原理图.pdf

《LG-LRM519-mr-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《LG-LRM519-mr-sm 维修电路原理图.pdf（192页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUALLG LRM-519 DIGITALMEDIARECORDERSERVICE MANUALMODEL : LRM-519(RV7922M)CAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETYPRECAUTIONS”IN THIS MANUAL.MODEL : LRM-519(RV7922M)SERVICE MANUALP/NO : 3829RVN004LAUGUST, 2005RadioFans.CN 收音机爱 好者资料库1-1SECTION 1SUMMARYCONTENTSPRODUCT SAFETY SERVICI

2、NG GUIDELINES FOR VIDEO PRODUCTS.1-2SERVICING PRECAUTIONS.1-3INTRODUCTION .1-4SPECIFICATIONS.1-5SYSTEM S/W UPGRADE.1-7TEST S/W .1-8RadioFans.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, un

3、der 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 u

4、pon 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 Zenit

5、h 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 a

6、ny 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 guide

7、lines.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 pre

8、sence 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: CAUT

9、ION: 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

10、-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 reli

11、efs, 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 remo

12、ve 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.

13、 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 electr

14、ical 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, e

15、tc.) 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 vo

16、lts 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,

17、 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 sc

18、arves 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 pro

19、vide 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 p

20、roduct 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 si

21、ngle 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 servici

22、ng the HD/SD PERSONAL VIDEORECORDER & RECEIVER WITH GEMSTAR covered bythis service data and its supplements and addends, read andfollow the SAFETY PRECAUTIONS. NOTE: if unforeseencircumstances create conflict between the following servic-ing precautions and any of the safety precautions in this pub-

23、lications, always follow the safety precautions.Remember Safety First:General Servicing Precautions1. Always unplug the HD/SD PERSONALVIDEORECORDER & RECEIVER WITH GEMSTAR AC powercord from the AC power source before:(1)Removing or reinstalling any component, circuit board, module, or any other asse

24、mbly.(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 haza

25、rd.2. Do not spray chemicals on or near this HD/SD PERSON-AL VIDEO RECORDER & RECEIVER WITH GEMSTARor any 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 cleaner,cotton-tip

26、ped 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 withwhich instruments covered by this service manual mightbe equipped.5. Do not apply AC power to this HD/SD PERSONAL

27、 VIDEORECORDER & RECEIVER WITH GEMSTAR and / or anyof its electrical assemblies unless all solid-state deviceheat sinks are correctly installed.6. Always connect the test instrument ground lead to anappropriate ground before connecting the test instrumentpositive lead. Always remove the test instrum

28、ent 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

29、 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 Elec

30、trostatically 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 ha

31、ndling 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 t

32、o 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 unso

33、lderES 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

34、. 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 removi

35、ng 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 motio

36、ns 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.)1-4INTRODUCTION - MSDVR & DVD Recorder receives the

37、analog NTSC or cable broadcasting and compresses the audio andvideo file into the MPEG format to save on HDD or record on DVD. It supports the additional service of EPG (Electronics Program Guide) provided from MS. - ConfigurationFor the CPU, Intel Celeron 733 of x86 is used and for peripheral chips

38、, CPU I/F, Memory I/F and NorthBridge and system parts for the North Bridge part that supports PCI I/F, IDE I/F serial I/F and USB I/F forgraphics function are used. The Audio/Video signal received from the tuner or external input is compressed through the MPEG Encoderand saved on HDD to be decoded

39、by the CPU for display and if needed, saved on DVD. Download or upgrade the MS EPG software through Ethernet and MODEM. The file can be shared with Windows XP PC through Ethernet or USB I/F WiFi device. It can be connected to an external HDD, Memory Card Reader, Memory Stick or WiFi device through U

40、SBI/F. System Part- CPU : Celeron 733(Low Voltage)- North Bridge : 830 - System Memory : SDRAM 128MByte MPEG-2 Encoder Part- MPEG-2 Encoder : CX23418- PCI I/F ,Video Decoder/ Audio Processor Interface Part- South Bridge : ICH4- IDE I/F: HDD, DVDRW- Super I/O- Ethernet- MODEM- USB 2.0 Audio/Video In/

41、Out Part- Tuner- Video Out- Audio CODEC1-5SPECIFICATIONSTelevision System NTSC, Analog American Standard (480i)Channel CoverageUnscrambled Air/Analog CATV 1-135Draft SpecificationNTSC Reception1. Terrestrial (ANT/Analog)2. Cable (CABLE/Analog)DVDR/WUSB 2.0Network1. Ethernet(10/100)2. Modem(56kbps)HD

42、D(160GB)DVD R/W Specifications DVD DVD-ROM : 4.7GB (Single Layer)8.5GB (Dual Layer)DVD-R : 4.7GB (Ver. 2.0 for Authoring : R & W)4.7GB (Ver. 2.0 for General: read & write )DVD-RW : 4.7GB (Ver. 1.1 read & write)DVD+R : 4.7GB/side (Ver. 1.1 read & write)DVD+RW : 4.7GB/side (Ver. 2.1 read & write)CDCD-

43、ROM Mode-1 data discCD-ROM Mode-2 data discCD-ROM XA, CD-I, Photo-CD Multi-Session, Video CDCD-Audio DiscMixed mode CD-ROM disc (data and audio)CD-Extra, CD-TextCD-R (Conforming to “Orange Book Part 2”: read)CD-RW (Conforming to “Orange Book Part 3”: read)Inputs/OutputRF InputAir/Cable TV (1)RF Outp

44、utOut To TV (1) (Loop Out)Component Video OutputComponent Out (1), RCA Jack connector 480p,480i - YPbPrS-Video Outputsimultaneous Out with CVBSS-Video Out (1), 4-pin Mini-DINComposite Video OutputVideo Out, RCA Jack connector (1-Port)Simultaneous Out with S-videoVideo Output Selection Switch480i - C

45、omposite480i,480p - Component SelectionVideo In480i Composite NTSCVideo In with L/R in(2), RCA Jack connectorS-Video InS-Video In, 4-pin Mini-DINAudio outL/R Out(2),SPDIF Out(1: Optical, 1: Coaxial)USB USB2.0(2-Port)Ethernet 10BASE-T/100BASE-T, RJ45(1)Modem 56kbps Data Modem, RJ11(1)VCR/Cable Box Co

46、ntrolIR Expender(1), Phone Jack Serial(1)Chassis Size 430mm(W) x 300mm(D) x 59mm(H)1-6* DVR Recording & Scheduling Instant recording / Series recording / Manual recording Conflict management Duplicate checking (recognize and ignore reruns and repeats)* DVR - Live TV 90 minutes buffer Recording Pause

47、 buffer Buffers live TV while playing a recorded TV program* DVR - Playback Skip ahead : 30 seconds Instant Replay : 7 seconds Multi speed FF & RW : 3 speed (3x,40 x,250 x) Slow motion : FWD 1/2x Frame advance* DVR etc. DVR functionality can work while DVD burning in progress Arrange recorded shows

48、into folders* Program Guide & Search Guide data : 14 days premium service Guide date source : dialup or broadband Combines channel guides from multiple sources Channel filtering Search by Title, Category, Topic (keyword)* DVD - Recording Disc Compatibility DVD-R/DVD-RW, DVD+R/DVD+RW, Double layer No

49、t support VR mode recording DVD burning speed : x4 Copy programs to DVD Create the DVD top menu and program info submenu Auto chapter marking : every 10 minutes Record shows to DVR while burning a DVD Use the boxs other functions during burning process* DVD - Playback Disc CompatibilityDVD-Video, DV

50、D-R/DVD-RW, DVD+R/DVD+RWDVD-/+RWAudio CD, CD-R, CD-RW Play a DVD or CD Angle/Subtitle selection, change audio language DVD playback while recording/buffering* Photo & Music Digital photo slideshow Play music Photo slideshows while playing music* Networking Fetch guide data over broadband 802.11 a/g