LG-LRM519-mr-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL LG LRM-519 DIGITAL MEDIARECORDER SERVICE MANUAL MODEL : LRM-519(RV7922M) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETYPRECAUTIONS” IN THIS MANUAL. MODEL : LRM-519(RV7922M)SERVICE MANUAL P/NO : 3829RVN004LAUGUST, 2005 RadioFans.CN 收音机爱 好者资料库 1-1 SECTION 1 SUMMARY CONTENTS PRODUCT

2、 SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.1-2 SERVICING PRECAUTIONS.1-3 INTRODUCTION .1-4 SPECIFICATIONS.1-5 SYSTEM S/W UPGRADE.1-7 TEST S/W .1-8 RadioFans.CN 收音机爱 好者资料库 1-2 IMPORTANT SAFETY NOTICE This manual was prepared for use only by properly trained audio-video service technicians. When

3、servicing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress mus

4、t 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 deviations are allow

5、ed 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 changes into the set is not delayed until the new service literature is printed. CAUTION: Do n

6、ot attempt to modify this product in any way. Never perform customized installations without manufacturers approval. Unauthorized modi- fications will not only void the warranty, but may lead to property damage or user injury. Service work should be performed only after you are thoroughly familiar w

7、ith these safety checks and servicing guidelines. GRAPHIC SYMBOLS The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature. The lightning flash with arrowhead symbol within an equilateral tri- angle is i

8、ntended to alert the service personnel to the presence of noninsulated “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 personn

9、el the following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE. SERVICE INFORMATION While servicing, use an isolation transformer for protection from AC line shock. After the original

10、service problem has been corrected, make a check of the fol- lowing: FIRE AND SHOCK HAZARD 1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop. 2. Verify that all protective

11、devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated. 3. Soldering must be inspected to discover possible cold sold

12、er joints, solder splashes, 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), and replace if necessary. 5. No lead or compone

13、nt should touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided. 6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, h

14、andle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS- FORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .1

15、5 mfd 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metal- lic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC volt

16、age measurements for each exposed 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 INSTALLATION 1. Never install any receiver in

17、 a closed-in recess, cubbyhole, or closely fitting shelf 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 where dew is a factor, near steam radiators where steam leakage is a factor, etc. 3. Avoid place

18、ment where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation. 4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mount

19、ed to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations. 5. Caution customers against moun

20、ting 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 carpe

21、ts. 7. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous conse- quences to home and family. A.C. Voltmeter 1500 OHM 10 WATT Place this probe on each exposed metal part. Good Earth Ground such as the Water Pipe

22、, Conduit, etc. 0.15uF PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS RadioFans.CN 收音机爱 好者资料库 1-3 SERVICING PRECAUTIONS CAUTION: Before servicing the HD/SD PERSONAL VIDEO RECORDER & RECEIVER WITH GEMSTAR covered by this service data and its supplements and addends, read and follow the SAFETY

23、 PRECAUTIONS. NOTE: if unforeseen circumstances create conflict between the following servic- ing precautions and any of the safety precautions in this pub- lications, always follow the safety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the HD/SD PERSONALVIDEO

24、RECORDER & RECEIVER WITH GEMSTAR AC power cord from the AC power source before: (1)Removing or reinstalling any component, circuit board, module, or any other assembly. (2)Disconnecting or reconnecting any internal electrical plug or other electrical connection. (3)Connecting a test substitute in pa

25、rallel with an elec- trolytic capacitor. Caution: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this HD/SD PERSON- AL VIDEO RECORDER & RECEIVER WITH GEMSTAR or any of its assemblies. 3.

26、Unless specified otherwise in this service data, clean electrical 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, lubrication of contacts is not requ

27、ired. 4. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped. 5. Do not apply AC power to this HD/SD PERSONAL VIDEO RECORDER & RECEIVER WITH GEMSTAR and / or any of its electrical assemblies unless all solid-state device heat si

28、nks are correctly installed. 6. Always connect the test instrument ground lead to an appropriate ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn th

29、e 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, Inpu

30、t terminals, Earphone jacks,etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and som

31、e field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor compo- nent or semiconductor-equipped assembly, drain off any electros

32、tatic charge on your body by touching a known earth 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

33、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 unsolder ES devices. 4. Use only an anti-static solder removal device. Some solder removal de

34、vices not classified as “anti-static” can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate an electrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protec- tive package until immedi

35、ately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil,or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch t

36、he protective material to the chassis or circuit assembly into which the device will be installed. Caution: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless

37、motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static elec- tricity sufficient to damage an ES device.) 1-4 INTRODUCTION - MSDVR & DVD Recorder receives the analog NTSC or cable broadcasting and compresses the audio and vide

38、o 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. - Configuration For the CPU, Intel Celeron 733 of x86 is used and for peripheral chips, CPU I/F, Memory I/F and North Bridge and system parts for the N

39、orth Bridge part that supports PCI I/F, IDE I/F serial I/F and USB I/F for graphics function are used. The Audio/Video signal received from the tuner or external input is compressed through the MPEG Encoder and saved on HDD to be decoded by the CPU for display and if needed, saved on DVD. Download o

40、r 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 USB I/F. System Part - CPU : Celeron 733(Low Voltage) - North B

41、ridge : 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/Out Part - Tuner - Video Out - Audio CODEC 1-5 SPEC

42、IFICATIONS Television System NTSC, Analog American Standard (480i) Channel CoverageUnscrambled Air/Analog CATV 1-135 Draft Specification NTSC Reception1. Terrestrial (ANT/Analog) 2. Cable (CABLE/Analog) DVDR/W USB 2.0 Network1. Ethernet(10/100) 2. Modem(56kbps) HDD(160GB) DVD R/W Specifications DVD

43、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-ROM Mode-1 data disc CD-ROM

44、Mode-2 data disc CD-ROM XA, CD-I, Photo-CD Multi-Session, Video CD CD-Audio Disc Mixed mode CD-ROM disc (data and audio) CD-Extra, CD-Text CD-R (Conforming to “Orange Book Part 2”: read) CD-RW (Conforming to “Orange Book Part 3”: read) Inputs/Output RF InputAir/Cable TV (1) RF OutputOut To TV (1) (L

45、oop Out) Component Video OutputComponent Out (1), RCA Jack connector 480p,480i - YPbPr S-Video Outputsimultaneous Out with CVBS S-Video Out (1), 4-pin Mini-DIN Composite Video OutputVideo Out, RCA Jack connector (1-Port) Simultaneous Out with S-video Video Output Selection Switch480i - Composite 480

46、i,480p - Component Selection Video In480i Composite NTSC Video In with L/R in(2), RCA Jack connector S-Video InS-Video In, 4-pin Mini-DIN Audio 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 Contr

47、olIR 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 Paus

48、e 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 into folders * Program Guide & Search Guide data : 14 days