LG-DA3520-avr-sm 电路图 维修手册.pdf

《LG-DA3520-avr-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《LG-DA3520-avr-sm 电路图 维修手册.pdf（56页珍藏版）》请在收音机爱好者资料库上搜索。

1、- 1-1 - CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS.1-2 ESD PRECAUTIONS.1-4 SPECIFICATIONS.1-5 LOCATION OF CUSTOMER CONTROLS.1-6 SECTION 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-

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

3、 SECTION 6. SPEAKER PART.6-1 SECTION 7. REPLACEMENT PARTS LIST.7-1 RadioFans.CN 收音机爱 好者资料库 SECTION 1. GENERAL PART SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to us

4、e. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) 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

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

6、crews should absolutely 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 surface If there is dust on the lens surface

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

8、re. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. - 1-2 - Storage in conductive

9、bagDrop impact NEVER look directly at the laser beam, and dont let contact fingers or other exposed skin. Magnet How to hold the pick-up Pressure Pressure Cotton swab Conductive Sheet RadioFans.CN 收音机爱 好者资料库 NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorpor

10、ate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed of m

11、any optical components and other high-precision components. Care must be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnetism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component part, first discon

12、nect the power supply lead wire from the unit 2) All equipment, 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 is because th

13、ere is the possibility of damage by static electricity.) 4) 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 prevent s

14、tatic electricity changes in the clothing to escape from the armband. 7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. CLEARING MALFUNCTION You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.). Using a pointed good

15、 conductor(such as driver), simply short the RESET jump wire on the inside of the volume 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

16、 to operate the RESET jump wire, it is necessary to unplug the power cord. - 1-3 - Armband Conductive Sheet Resistor (1 Mohm) Resistor (1 Mohm) VOLUME KNOB UP DOWN VOLUME RESET jump wire RadioFans.CN 收音机爱 好者资料库 ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state

17、) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used t

18、o help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially

19、 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 ESD devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostati

20、c charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical charges sufficient to damage ESD devices. 5.

21、Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD devices. 6. Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ESD devices are packaged with leads electrically

22、 shorted together by conductive foam, aluminum foil or comparable conductive materials). 7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed. CAUTIO

23、N : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted

24、 floor can generate static electricity sufficient to damage an ESD device). - 1-4 - - 1-5 - SPECIFICATIONS Power supplyAC 220240V, 50/60Hz Power consumption70W General Mass10.2 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

25、 35C, Operation status: Horizontal Operating humidity5% to 90% LaserSemiconductor laser, wavelength 650nm Signal systemPAL 625/50, NTSC 525/60 Frequency response(audio)4 Hz to 20 kHz CD/DVDSignal-to-noise ratio(audio)More than 90dB(1kHz, NOP, 20kHz LPF/A-Filter) Dynamic range (audio)More than 95dB H

26、armonic distortion(audio)0.15% (1kHz, at 12W position) Video input1.0V (p-p), 75, negative syne., RCA jack VideoVideo output1.0V (p-p), 75, negative sync., RCA jack S-video output(Y) 1.0V (p-p), 75, negative sync., Mini DIN 4-pinx 1 (C) 0.3V (p-p), 75 Tuning Range87.5 108MHz FM Intermediate Frequenc

27、y10.7MHz Signal-to Noise Ratio50dB Frequency Response15012,000Hz AM(MW) Tuning Range530 1,810kHz Intermediate Frequency450MHz Stereo mode30W + 30W(8 at 1kHz, THD 1%) Amplifier Surround modeFront: 30W+30W Center*: 30W Surround*: 30W +30W(8 at 1Hz, THD 1%) Subwoofer*: 30W(8 at 60Hz, THD 1%) InputsVIDE

28、O 1, 2 OutputsVIDEO 1(AUDIO OUT): 2V WOOFER: 2V Satellite Speaker (FE-3500TE) Passive Subwoofer(FE-3500WE) Type1 Way 1 Speaker1 Way 1 Speaker Impedance88 SpeakersFrequency Response12020,000Hz351,000Hz Sound Pressure Level84dB/W(1m)83dB/W(1m) Rated Input Power30W30W Max. Input Power60W60W Net Dimensi

29、ons (W x H x D)90 x 125 x 106mm160 x 350 x 325mm Net Weight0.7kg4.78kg Supplied Accessories Audio cable. 1 Speakers . 6 Remote control. 1 AM Ioop antenna. 1 Video cable. 1 Speaker cables. 5 Batteries . 2 FM antenna . 1 * Depending on the sound mode settings and the source, there may be no sound outp

30、ut. Tuner - 1-6 - LOCATION OF CUSTOMER CONTROLS STANDBY/ON FUNCTIONTUNE/SKIPPLAY/PAUSE OPEN/CLOSE MEMORYTITLE FM/AMMONO/ST. STOP/CLEAR MENURETURNENTER VOLPHONESMENU/PREST RDS Disc Tray FUNCTION button SKIP/TUNE buttons PHONE connector MENU(MONO/STEREO) button ENTER button RETRUN (RDS) button VOLUME

31、controller ARROW/PRESET joy stickPALY/PAUSE button STOP (MEMORY/CLEAR) button TITLE (FM/AM)button RESET button (located at the bottem, see page 46.) OPEN/CLOSE buttonRemote sensor POWER button and indicator PCMMUTE DIGITAL PRO LOGIC DVDCD VCDMP3 HALL1THEATER HALL2 dts RDS TITLE REPEAT CHP/TRK MEMORY

32、PROGRAM ms dB MHz kHz ALLABSLEEPTUNEDSTEREO Sound mode indicatorRDS indicator PROGRAM indicator SLEEP indicator TUNED indicator STEREO indicator MUTE indicatorMEMORY indicators Chapter/Track number indicator Title number indicator PALY/PAUSE indicator Angle icon indicator Disc indicator Total playin

33、g time/Elapsed time/ Frequency/Delay time/ Volume etc. indicators Repeat playback mode indicators FRONT PANEL DISPLAY WINDOW - 1-7 - FM 75 Coaxial Antenna Connector MONITOR OUT Connector AM Antenna Connector SPEAKER Connectors VIDEO 1(Input/Output) Connectors VIDEO 2(Input) Connectors S-VIDEO OUT Co

34、nnector WOOFER OUT Connector POWER CORD Connect to an AC 230V, 50Hz outlet only. VIDEO SELECTOR Switch RL FM 75 GNDAM AUTO-NTSC-PAL VIDEO? SELECTION S-VIDEO? OUT AUDIO L R WOOFER? OUT VIDEO 2 VIDEO ININ R REAR (8) WOOFER (8) CLEAR FRONT? SPEAKER (8) (8) L OUT VIDEO 1 MONITOR? OUT REAR PANEL - 1-8 -

35、REAR PANEL you will find instructions for each of the remote control functions in the appropriate sections of this instruction manual. POWERMUTE FM/AMCD/DVDVIDEO 1 PRESET VOLUME PLAY PROG.REPEAT. PAUSE STEP TEST TONE SOUND MODE BY PASS LEVEL DISPLAY SET-UP AUDIO REV. FWD ENTER ANGLES-TITLE REPEAT ZO

36、OM CLEARSEARCH MARKER SLOW SCAN TITLE A - B MENU RETURN DELAY STOPSKIP 13245 68790 VIDEO 2SLEEP POWER button MUTE button VIDEO 1 buttonVIDEO 1 button SLEEP button VIDEO 2 buttonVIDEO 2 button NUMBER buttons STOP button BY PASS button SOUND MODE button TEST TONE button DELAY button LEVEL button RETUR

37、N button DISPALY button *MENU button*MENU button SET-UP button SEARCH button MARKER button SLOW SCAN () buttons SKIP(*SEARCH) button PREST(/) buttons FM/AM button CD/DVD button VOLUME(/) buttons PAUSE button PROGRAM buttons *ARROW buttons ENTER button ANGLE button SUBTITLE button REPEAT A-B button Z

38、OOM button *TITLE button CLEAR button AUDIO button PLAY button *MENU button Use the MENU button to display the menu screen included on DVD video discs. *TITLE button Use 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. * Press and hold button for about two seconds for search function. - 2-1 - SECTION 2.