LG-DA3520-avr-sm 维修电路原理图.pdf

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1、- 1-1 -CONTENTSSECTION 1. GENERAL SERVICING PRECAUTIONS.1-2 ESD PRECAUTIONS.1-4 SPECIFICATIONS.1-5 LOCATION OF CUSTOMER CONTROLS.1-6SECTION 2. AUDIO PART ELECTRICAL TROUBLESHOOTING GUDIE.2-1 DVD PLAYER PROGRAM DOWNLOAD METHOD.2-5 WAVEFORMS OF MAJOR CHECK POINT.2-7 INTERNAL BLOCK DIAGRAM OF ICs.2-8 I

2、C VOLTAGE SHEET .2-13 BLOCK DIAGRAM.2-15 SCHEMATIC DIAGRAMS.2-17 PRINTED CIRCUIT DIARGAMS.2-25SECTION 3. DVD PART ELECTRICAL TROUBLESHOOTING GUIDE .3-1 BLOCK DIAGRAMS.3-8 SCHEMATIC DIAGRAMS.3-11 WAVEFORMS .3-19 PRINTED CIRCUIT DIAGRAM .3-21SECTION 4. MECHANSIM.4-1SECTION 5. EXPLODED VIEWS.5-1SECTION

3、 6. SPEAKER PART.6-1SECTION 7. REPLACEMENT PARTS LIST.7-1RadioFans.CN 收音机爱 好者资料库SECTION 1. GENERAL PARTSERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage1) The pick-up should always be left in its conductive bag until immediately prior to use.2) The pick-u

4、p should never be subjected to external pressure or impact.2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it i

5、s subjected to strong pressure or impact, the result may be an operational malfunction and/ordamage to the printed-circuit board.3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely

6、 never be touched.4) Laser beams may damage the eyes!Absolutely never permit laser beams to enter the eyes!Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned

7、 away by using an air bush (such as usedfor camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, acotton swab should be used, taking care not to distort this.6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dir

8、ty, apply isopropyl alcohol to the cotton swab. (Donot use any other liquid cleaners, because they will damage the lens.) Take care not to use too much ofthis alcohol on the swab, and do not allow the alcohol to get inside the pick-up.- 1-2 -Storage in conductive bagDrop impactNEVER look directly at

9、 the laser beam, and dont letcontact fingers or other exposed skin.MagnetHow to hold the pick-upPressurePressureCotton swabConductive SheetRadioFans.CN 收音机爱 好者资料库NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (la

10、ser diode). Thesecomponents are sensitive to, and easily affected by, static electricity. If such static electricity is highvoltage, components can be damaged, and for that reason components should be handled with care.2) The pick-up is composed of many optical components and other high-precision co

11、mponents. Care mustbe taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strongmagnetism is present, or where there is excessive dust.2. Notes for repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All eq

12、uipment, measuring instruments and tools must be grounded.3) The workbench should be covered with a conductive sheet and grounded.When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This isbecause there is the possibility of damage by static electricity.)4)

13、 To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounded by an armband (1M)6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to preventstatic electricity changes in the clothing to escape from the a

14、rmband.7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.CLEARING MALFUNCTIONYou can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).Using a pointed good conductor(such as driver), simply short the RESET jump wire on th

15、e inside of thevolume knob for more than 3 seconds. If you reset your unit, you must reenter all its settings(stations, clock, timer)NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.2. If you wish to operate the RESET jump wire, it is necessary to unplug the power

16、cord.- 1-3 -ArmbandConductiveSheetResistor(1 Mohm)Resistor(1 Mohm)VOLUME KNOBUPDOWNVOLUMERESET jump wireESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically S

17、ensitive Devices (ESD). Examples of typical ESD devices are integratedcircuits and some field-effect transistors and semiconductor chip components. The following techniques shouldbe used to help reduce the incidence of component damage caused by static electricity.1. Immediately before handling any

18、semiconductor component or semiconductor-equipped assembly, drain offany electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear acommercially available discharging wrist strap device, which should be removed for potential shock reasonsprior to applying pow

19、er to the unit under test.2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductivesurface 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 ESD devic

20、es.4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static cangenerate electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDdevices.6. Do not remo

21、ve a replacement ESD device from its protective package until immediately before you are readyto install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive foam, aluminum foil or comparable conductive materials).7. Immediately before removing the pro

22、tective material from the leads of a replacement ESD device, touch theprotective material to the chassis or circuit assembly into which the device will by installed.CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHERSAFETY PRECAUTIONS.8. Minimize bodily motions whe

23、n handing unpackaged replacement ESD devices. (Otherwise harmless motionsuch as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor cangenerate static electricity sufficient to damage an ESD device).- 1-4 - 1-5 -SPECIFICATIONSPower supplyAC 220240V, 50/60Hz

24、Power consumption70WGeneralMass10.2 Ibs(4.6kg)External dimensions (W x H x D)360 x 82 x 388mm(14.2 x 3.2 x 15.3 inches)Operating conditionsTemperature: 5C to 35C, Operation status: HorizontalOperating humidity5% to 90%LaserSemiconductor laser, wavelength 650nmSignal systemPAL 625/50, NTSC 525/60Freq

25、uency response(audio)4 Hz to 20 kHzCD/DVDSignal-to-noise ratio(audio)More than 90dB(1kHz, NOP, 20kHz LPF/A-Filter)Dynamic range (audio)More than 95dBHarmonic distortion(audio)0.15% (1kHz, at 12W position)Video input1.0V (p-p), 75, negative syne., RCA jackVideoVideo output1.0V (p-p), 75, negative syn

26、c., RCA jackS-video output(Y) 1.0V (p-p), 75, negative sync., Mini DIN 4-pinx 1 (C) 0.3V (p-p), 75Tuning Range87.5 108MHzFMIntermediate Frequency10.7MHzSignal-to Noise Ratio50dBFrequency Response15012,000HzAM(MW)Tuning Range530 1,810kHzIntermediate Frequency450MHzStereo mode30W + 30W(8 at 1kHz, THD

27、1%)AmplifierSurround modeFront: 30W+30W Center*: 30WSurround*: 30W +30W(8 at 1Hz, THD 1%)Subwoofer*: 30W(8 at 60Hz, THD 1%)InputsVIDEO 1, 2OutputsVIDEO 1(AUDIO OUT): 2VWOOFER: 2VSatellite Speaker (FE-3500TE) Passive Subwoofer(FE-3500WE)Type1 Way 1 Speaker1 Way 1 SpeakerImpedance88SpeakersFrequency R

28、esponse12020,000Hz351,000HzSound Pressure Level84dB/W(1m)83dB/W(1m)Rated Input Power30W30WMax. Input Power60W60WNet Dimensions (W x H x D)90 x 125 x 106mm160 x 350 x 325mmNet Weight0.7kg4.78kgSuppliedAccessories Audio cable. 1 Speakers . 6 Remote control. 1 AM Ioop antenna. 1 Video cable. 1 Speaker

29、cables. 5 Batteries . 2 FM antenna . 1* Depending on the sound modesettings and the source, there maybe no sound output.Tuner- 1-6 -LOCATION OF CUSTOMER CONTROLSSTANDBY/ONFUNCTIONTUNE/SKIPPLAY/PAUSEOPEN/CLOSEMEMORYTITLEFM/AMMONO/ST.STOP/CLEARMENURETURNENTERVOLPHONESMENU/PRESTRDSDisc TrayFUNCTIONbutt

30、onSKIP/TUNEbuttonsPHONE connectorMENU(MONO/STEREO) buttonENTER buttonRETRUN (RDS) buttonVOLUME controller ARROW/PRESET joy stickPALY/PAUSE buttonSTOP (MEMORY/CLEAR) buttonTITLE (FM/AM)buttonRESET button (located atthe bottem, see page 46.)OPEN/CLOSE buttonRemote sensorPOWER button and indicatorPCMMU

31、TEDIGITALPRO LOGICDVDCDVCDMP3HALL1THEATERHALL2dtsRDSTITLEREPEATCHP/TRKMEMORYPROGRAMmsdBMHzkHzALLABSLEEPTUNEDSTEREOSound mode indicatorRDS indicatorPROGRAM indicatorSLEEPindicatorTUNED indicatorSTEREOindicatorMUTE indicatorMEMORYindicatorsChapter/Tracknumber indicatorTitle numberindicatorPALY/PAUSE i

32、ndicatorAngle icon indicatorDisc indicatorTotal playing time/Elapsed time/Frequency/Delay time/Volume etc. indicatorsRepeat playbackmode indicatorsFRONT PANELDISPLAY WINDOW- 1-7 -FM 75 Coaxial Antenna ConnectorMONITOR OUT ConnectorAM Antenna ConnectorSPEAKER ConnectorsVIDEO 1(Input/Output)Connectors

33、VIDEO 2(Input) ConnectorsS-VIDEO OUT ConnectorWOOFER OUT ConnectorPOWER CORD Connect to anAC 230V, 50Hz outlet only.VIDEO SELECTOR SwitchRLFM75GNDAMAUTO-NTSC-PALVIDEO?SELECTIONS-VIDEO?OUTAUDIOLRWOOFER?OUTVIDEO 2VIDEOININRREAR(8)WOOFER(8)CLEARFRONT?SPEAKER(8)(8)LOUTVIDEO 1MONITOR?OUTREAR PANEL- 1-8 -

34、REAR PANEL you will find instructions for each of the remote control functions in the appropriate sections of this instructionmanual.POWERMUTEFM/AMCD/DVDVIDEO 1PRESETVOLUMEPLAYPROG.REPEAT.PAUSESTEPTESTTONESOUNDMODEBY PASSLEVELDISPLAYSET-UPAUDIOREV.FWDENTERANGLES-TITLEREPEATZOOMCLEARSEARCHMARKERSLOW

35、SCANTITLEA - BMENURETURNDELAYSTOPSKIP1324568790VIDEO 2SLEEPPOWER buttonMUTE buttonVIDEO 1 buttonVIDEO 1 buttonSLEEP buttonVIDEO 2 buttonVIDEO 2 buttonNUMBER buttonsSTOP buttonBY PASS buttonSOUND MODE buttonTEST TONE buttonDELAY buttonLEVEL buttonRETURN buttonDISPALY button*MENU button*MENU buttonSET

36、-UP buttonSEARCH buttonMARKER buttonSLOW SCAN () buttonsSKIP(*SEARCH) buttonPREST(/) buttonsFM/AM buttonCD/DVD buttonVOLUME(/) buttonsPAUSE buttonPROGRAM buttons*ARROW buttonsENTER buttonANGLE buttonSUBTITLE buttonREPEAT A-B buttonZOOM button*TITLE buttonCLEAR buttonAUDIO buttonPLAY button*MENU butt

37、onUse the MENU button to display the menu screen included on DVD video discs. *TITLE buttonUse the TITLE button to display the title screen included on DVD video discs. *Directional arrow buttons(up, down, left, right) for use in highlighting a selection on a GUI menu screen, TITLE and MENU screen.*

38、 Press and hold button for about two seconds for search function.- 2-1 -SECTION 2. AUDIO PARTELECTRICAL TROUBLESHOOTING GUDIETurn power on.Is power on?Does initial read work?Does it play?Does it output audio?Check power supply circuit.Check laser circuit.Check focus circuit.Check disc.Check tracking

39、 servo circuit.Check audio circuit.OKYESYESYESYESNONONONO1.- 2-2 -2. AUDIO . COM Circuit POWER ONDoes CD/DVDappear at FLT?Does LOADINGappear at FLD?Does it appearDVD Error atFLD?Does Video1/2FM 87.5 appearat FLD?OK.CheckConnector(CN103)ifis normally.Reconnet it.Refer to SMPSRefer to oscillatorCircui

40、t.Check DVD Reset Waveform.Check IC101 Reset Wavefrom.Check 3.3V line.Check Power dection Circuit.Check power partof Main B/D.Check oscillatorof x101.Check if CN103Pin is High.Check if IC101Pin is High.Check if IC101 Pin is high (3.3r).Check if IC101 Pinis High .Replace IC 101.Does no Dise orTime ap

41、pear at FLD?Check if DVD an Audio Micom Interface is OK.Check power.Check DVD Module.Check SMPS.4230363- 2-3 -3. Front Circuit (1/2)POWER ONLED OFF.Is digitronon normally?Check ifthe CN401is OK.Check if theFront power isOK(*1).Check if the IC401 OSC PinWavefrom isOK.Check if theIC401 Pinsis OK(*2).C

42、heck if theR 427OK.ReplaceR 427.Refer to SMPS Part.Reconnec it.Check if theVFD401 Pinsare OK.Check IC401 Pins , ,WavefromRefer to Micom Circuit.Check Pattenand Resoldering.Replace IC401.Check if all Buttensare OK.Check if theVolume isOK.Check if theHeadphone isOK.Check if theRemocon isOK.Front B/D O

43、K.* 1: CN401 PinsPin 13: +5VPin 14: -32VPin 15: -28VPin 16: -32V* 2: CN401 PinsPin 14: +5VPin 133: -32V* 3: VFD401 PinsF11 : -28VF22 : -32V52567- 2-4 -Front Circuit (2/2)Check if the Power part of theFront is OK.Check if the Power part of the Front is OK.Check ifR401R415OK.Check ifCN401 Pins3, 4Wave

44、rfromOK.Check ifR430, R431OK.Refer to MicomCircuitRefer to MicomCircuit.Refer topower(SMPS).Refer topower(SMPS).Refer to SMPS part.Refer to SMPS.Replace R401R415.Replace R430, R431.Check if the Power part of the Front is OK.Check if the Power Part of the Front is OK.Check if theRMC401Volumeis OK (5V

45、).Check if the Remocon waveform ofthe CN401.Check if theCN401 pin11is Low.Check ifheadphoneJack in JK401 is OK.Refer to M-COMCircuit.Check Main B/D.Replace RMC 401.Check RMC Circuit.Refer to MicomCircuit.Check JK401 Circuit.- 2-5 -DVD PLAYER PROGRAM DOWNLOAD METHOD1. DVD player without CD-RW option1

46、-1) Download the DVD program from your PC as following procedureACTIONFLD display Plug the Power cord out Connect the Fixture for download(Refer to Deck Mechanism Adjustment) Execute the prgram for download(Flashrom.exe) Open the DVD program file Plug the Power cord in Press the MENU Key on the Remo

47、te controllerFLASH Select Down icon with injector icon then start download from the P.C In status of download Erased the Flash memoryFLASH ERA Written the Flash memoryFLASH XX(XX: Program counter) Verified the Flash memoryFLASH XX(XX: Program counter) Completed the downloadFINISHED If an error was o

48、ccurred during download, do not unplug the Power cord, and retry the downloadform the P.C until it is completed.2. DVD player with CD-RW option(for models using C-CUBEMPEG chip, marking on the IC is ZIVA)2-1) Make the DVD program upgrade Disc as following procedure *Recommended S/W: adaptec Easy CD

49、Creater*use file format: ISO9660 Rename the souce file from the P.C to FIRMWARE.BIN (Ex, If Source file is lg_a3_korea.bin, rename to FIRMWARE.BIN) Format the CD-RW Disc as below Make the Folder name to UPGRSADE.DVD under root folder(Ex, UPGRADE.DVD) Download the source file renamed to FIRMWARE.BIN

50、in the folder(Ex, UPGRADE.DVD FIRMWARE.BIN)WWW- 2-6 -2-2) Insert the upgrade Disc into the DVD player slot, then the DVD player reads theDisc and upgrade the Firmware itself as followingsStatusFLD display on DVD player Detect the upgrade DiscNo display Read the DiscCd rEAD XX(XX: Program counter) Er