LG-LXD2230D-cs-sm 维修电路原理图.pdf

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1、- 1-1 -CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS.1-2 ESD PRECAUTIONS.1-4 SPECIFICATION.1-5 SECTION 2. ELECTRICAL SECTION ADJUSTMENTS.2-1 AUDIO PART ELECTRICAL TROUBLESHOOTING GUIDE. 2-2 BLOCK DIAGRAM.2-11 SCHEMATIC DIAGRAMS.2-13 IC/TR VOLTAGE SHEET . 2-19 WIREING DIAGRAM. 2-21 PRINTED CIRCUI

2、T DIAGRAMS. 2-23 SECTION 3. ELECTRICAL TROUBLESHOOTING GUIDE TROUBLESHOOTING .3-1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING .3-8 DVD PART SCHEMATIC DIAGRAMS. 3-21 PRINTED CIRCUIT DIAGRAM . 3-29 SECTION 4. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION. 4-1 TAPE DECK MECHANISM: AUTOREVERSE DE

3、CK. 4-3 CD MECHANISM . 4-5 SECTION 5. SPEAKER PART SPEAKER PART.5-1 SECTION 6. REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST.6-1RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage1) The pick-up should always be left in its conductive

4、 bag until immediately prior to use.2) The pick-up 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 c

5、are to avoid external pressure andimpact. If it is 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 adjustmen

6、t point and installation screws 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 surfaceIf there is dus

7、t on the lens surface, the dust should be cleaned 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

8、 by excess pressure. If the lens is extremely dirty, 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 i

9、n conductive bagDrop impactNEVER look directly at the laser beam, and dont letcontact fingers or other exposed skin.MagnetHow to hold the pick-upPressurePressureCotton swabConductive SheetSECTION 1. GENERALRadioFans.CN 收音机爱 好者资料库NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations1) Compact d

10、isc players incorporate a great many ICs as well as the pick-up (laser 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

11、 is composed of many optical components and other high-precision components. 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,

12、 first disconnect the power supply lead wire from the unit2) 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 isb

13、ecause there 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 pre

14、ventstatic 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 MALFUNCTIONYou can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).Using a pointed goo

15、d conductor(such as driver), simply short the RESET jump wire on the 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 t

16、o operate the RESET jump wire, it is necessary to unplug the power cord.- 1-3 -ArmbandConductiveSheetResistor(1 Mohm)Resistor(1 Mohm)VOLUME KNOBUPDOWNVOLUMERESET jump wire ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static

17、 electricity. Such componentscommonly are called Electrostatically Sensitive 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 dam

18、age caused by static electricity.1. Immediately before handling any 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, whic

19、h should be removed for potential shock reasonsprior to applying power 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. Us

20、e 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 cangenerate electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals. These can genera

21、te electrical charges sufficient to damage ESDdevices.6. Do not remove 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 com

22、parable conductive materials).7. Immediately before removing the protective 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, AN

23、D OBSERVE ALL OTHERSAFETY PRECAUTIONS.8. Minimize bodily motions when 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 ES

24、D device).CAUTION. GRAPHIC SYMBOLS- 1-4 -THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERALTRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCEOF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENTMAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCLAMATION PO

25、INT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TOALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETYINFORMATION IN SERVICE LITERATURE.- 1-6 -MEMO- 2-1 -TAPE DECK ADJUSTMENT1. AZIMUTH ADJUSTMENTFigure 1. Azimuth Adjustment Connection DiagramCH1 CH2Speaker OutPlayback ModeHeadTest TapeMTT-

26、114L chR chGNDDual-tracesynchroscopeElectronicVoltmeterL outR outUnit ADJUSTMENTSThis set has been aligned at the factory and normally will not require further adjustment. As a result, it is notrecommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tam

27、perswith the adjustment, realignment may be necessary.IMPORTANT1. Check Power-source voltage.2. Set the function switch to band being aligned.3. Turn volume control to minimum unless otherwise noted.4. Connect low side of signal source and output indicator to chassis ground unless otherwise specifie

28、d.5. Keep the signal input as low as possible to avoid AGC and AC action.Deck ModeTest TapeTest PointAdjustmentAdjust forPalybackMTT-114Speaker OutDECK ScrewMaximumAzimuth ScrewSECTION 2. ELECTRICAL SECTION- 2-2 - AUDIO PART ELECTRICAL TROUBLESHOOTING GUIDEVKK PARTDoes DC - 33V appear at PN301 pin .

29、OKCheck the -27V of ZD901(-)Check the Q902 TURN ONCheck the -277VLower ofC918(-)Replace the Q902Replace the D908, D909OKRefer to powerTroubleshootingYESYESYESYESYESNONONOP-SENS PART Does +5V appear at ZD900?Check the pattern of IC301 pin .Check the waveform of D907 (+).Check the R901 and ReplaceZD 9

30、00Replace the D907YESYESNONO2631- 2-3 -POWER CIRCUIT Check the Fuse Check the DC output of C732(+), C731(-)Check the DC Output of IC712, IC751OKReplace the Fuse Check the 1.5V AC output of D701Replace the D701Replace the TransformerYESYESYESYESNONONOMUTING CIRCUIT (MUTE)Dose “High” appear at Q701, Q

31、702, Q703, Q751,Q752 “B”check the “Low” of Q701,Q702, Q703, Q751, Q752 “C”MUTECheck the IC203 Troubleshooting(ONLY Q201/Q251)Check the “High” of Q704, Q705,Q706 “E” (ONLY Q701/Q751)Replace the Q704, Q705, Q706Replace the TRRefer to IC 301TroubleshootingYESYESYESNONONO- 2-4 -AUDIO ABNORMALCheck the o

32、utput of IC701, IC702, IC703 Pin 2, 4Check the connecting tospeakerCheck the FUNCTION inputterminalCheck the input of IC701,IC702, IC703, pin7, 11Check the 12V output ofIC602, IC601 Check the 12V output ofIC704OKYESNOFUNCTION MODE AUDIO ABNORMALTAPECheck the signal input of IC601 pin6, 23Refer to “I

33、C201 Troubleshooting”AUXChekc the signal input of IC600, pin5, 24Check the signal input of JK400- 2-5 -Check the signal input of IC601 pin3, 26Check the signal input of PN704 pin11, 13, 15, 17, 19Check the signal input of IC601 pin4, 25Refer to “TUNER PACK Troubleshooting”CDTUNERIC301 TROUBLESHOOTIN

34、GCheck the power supplied to IC301 pin17, 46, 72, 90?Refer to “Power Circuit Troubleshooting”Check the P-SENSReplace the X301Check the RESET circuitCheck the P-SENS “High” of IC301 pin26Check the oscillation of X301When power supplying to IC301 pin12.(Low High)Replace the IC301YESYESYESYESNONONONO-

35、2-6 -Refer to “IC301Troubleshooting”IC601 TROUBLESHOOTINGIC602 TROUBLESHOOTINGRefer to “Power Circuit Troubleshooting”Check the Data of IC301 pin87, 88(CD TAPE FUNCTION)Refer to power TroubleshootingCheck the Data of IC301 pin 85, 86Check the patter of IC301 & IC602Replace the IC601Check the pattern

36、 ofIC301 & IC601Check the power suppliedto IC601 pin1Check the CLK Data of IC601 pin14, 15Check the FUNCTION SELECTORENDCheck the Power supplied to IC602 pin 1Check the CLK Data of IC602 pin9, 10Replace the IC602YESYESYESYESYESYESNONONONONO- 2-7 -TUNER PACK TROUBLESHOOTINGCheck the 9V of PN602 pin2C

37、heck the GND of PN602 pin 4, 10Check the patternCheck the DC of C670Check the powerYESNOPLAYCheck the VCC supplying to IC201 pin4Refer to “Power CircuitTroubleshooting”Check the Deck MechaReplace the DeckMecha.Replace the IC201Check the signal output of IC201 pin3, 6Check the “LOW” of Q201, Q251, “B

38、”YESYESYESNONONO- 2-8 -REC (Q252, Q202 ON / R273, R223 HIGH)Check signal supplied to IC203 pin2, 8 ?Check the output of IC203 pin3, 7Check the “output” of L201 pin5Refer to “power circuit Troubleshooting”Check the powersupplying to C227(+)Check the oscillation of Q204, “E”Check the signal of R212, R

39、262Check the PatternCheck the Vcc power of IC203 Pin6Check the oscillation of L201 pin 1, 3Replace the DECKCheck the “Low” of Q202,Q252 “B”Replace the Q202, Q252Check the “Low” ofIC501 pin9Refer to “Power CircuitTroubleshooting”Check the 0.6V ofQ205 “B”Replace the L201YESYESYESYESYESYESYESYESNONONON

40、ONONONONO- 2-9 - POWER P.C. BOARD (SOLDER SIDE)- 2-10 -MEMO2-112-12 BLOCK DIAGRAMNOTE: WarningParts that are shaded are critical With respectto risk of fire or electrical shock. SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM2-132-142-152-16 FRONT SCHEMATIC DIAGRAM POWER SCHEMATIC DIAGRAM2-172-18NOTE:1. S

41、haded(I) parts are critical for safety.Replace onlywith specified part number.2. Voltages are DC-measured with a digital voltmeferduring Play mode.NOTE: WarningParts that are shaded are critical With respectto risk of fire or electrical shock.2-192-20ICPIN NUM.STOPDVD PLAYMIDI PLAY1 -19.3 -19.3 -19.

42、3 IC7012 -0.2 -0.2 -0.2 IC7023 19.0 19.0 19.0 IC7034 -18.4 -18.4 -18.4 5 7.7 7.7 7.7 6 -19.4 -19.4 -19.4 7 0.0 0.0 0.0 8 2.3 2.3 2.3 9 0.0 0.0 0.0 10 0.0 0.0 0.0 11 0.0 0.0 0.0 1 -11.5 -11.5 -11.5 IC7122 -19.4 -19.4 -19.4 3 0.0 0.0 0.0 1 0.0 0.0 0.0 2 0.0 0.0 0.0 IC2023 0.0 0.0 0.0 4 9.5 9.5 9.5 5 0

43、.0 0.0 0.0 6 0.1 0.1 0.1 7 0.0 0.0 0.0 8 0.0 0.0 0.0 9 0.0 0.0 0.0 1 0.0 0.0 0.0 IC2012 1.3 1.3 1.3 3 0.7 0.7 0.7 4 3.4 3.4 3.4 5 0.0 0.0 0.0 6 11.4 11.4 11.4 7 3.5 3.5 3.5 8 1.7 1.7 1.7 9 1.3 1.3 1.3 1 1.8 1.8 1.8 IC2032 0.0 0.0 0.0 3 1.8 1.8 1.8 4 11.2 11.2 11.2 5 0.0 0.0 0.0 6 0.0 0.0 0.0 7 1.8 1

44、.8 1.8 8 0.0 0.0 0.0 9 1.78 1.78 1.78 IC1021 9.0 9.0 9.0 2 4.5 4.5 4.5 3 4.5 4.5 4.5 4 4.5 4.5 4.5 5 4.5 4.5 4.5 6 4.5 4.5 4.5 ICPIN NUM.STOPDVD PLAYMIDI PLAY7 4.5 4.5 4.5 8 0.0 0.0 0.0 9 0.0 0.0 0.0 10 0.0 0.0 0.0 11 0.0 0.0 0.0 12 0.0 0.0 0.0 13 0.0 0.0 0.0 14 4.5 4.5 4.5 15 4.5 4.5 4.5 16 4.5 4.5

45、 4.5 17 4.5 4.5 4.5 18 4.5 4.5 4.5 19 4.5 4.5 4.5 20 4.5 4.5 4.5 IC5011 0.0 0.0 0.0 2 0.0 0.0 0.0 3 0.0 0.0 0.0 4 0.0 0.0 0.0 5 0.0 0.0 0.0 6 0.0 0.0 0.0 7 0.0 0.0 0.0 8 0.0 0.0 0.0 9 4.4 4.4 4.4 10 0.0 0.0 0.0 11 0.0 0.0 0.0 12 0.0 0.0 0.0 13 2.4 2.4 2.4 14 0.0 0.0 0.0 15 0.0 0.0 0.0 16 5.4 5.4 5.4

46、 IC6011 8.8 8.8 8.8 2 4.4 4.4 4.4 3 4.4 4.4 4.4 4 4.4 4.4 4.4 5 4.4 4.4 4.4 6 4.4 4.4 4.4 7 4.4 4.4 4.4 8 4.4 4.4 4.4 9 4.4 4.4 4.4 10 4.4 4.4 4.4 11 4.4 4.4 4.4 12 4.4 4.4 4.4 13 0.0 0.0 0.0 14 0.0 0.0 0.0 15 0.0 0.0 0.0 16 4.4 4.4 4.4 17 4.4 4.4 4.4 ICPIN NUM.STOPDVD PLAYMIDI PLAY18 4.4 4.4 4.4 19

47、 4.4 4.4 4.4 20 4.4 4.4 4.4 21 4.4 4.4 4.4 22 4.4 4.4 4.4 23 4.4 4.4 4.4 24 4.4 4.4 4.4 25 4.4 4.4 4.4 26 4.4 4.4 4.4 27 4.4 4.4 4.4 28 0.0 0.0 0.0 IC/TR VOLTAGE SHEET WIRING DIAGRAM2-212-22 PRINTED CIRCUIT DIAGRAMS MAIN P.C. BOARD(SOLDER SIDE)2-232-242-252-26 MAIN P.C. BOARD(COMPONENT SIDE)2-272-28

48、 FRONT P.C. BOARD (SOLDER SIDE)NOTE: WarningParts that are shaded are critical With respectto risk of fire or electrical shock.2-292-30 FRONT P.C. BOARD (COMPONENT SIDE)NOTE: WarningParts that are shaded are critical With respectto risk of fire or electrical shock.- 3-1 -1. Power check flowSECTION 3

49、. DVD PART ELECTRICALTROUBLESHOOTING GUIDE2. Test & debug flow- 3-2 - 3-3 - 3-4 - 3-5 - 3-6 - 3-7 -DETAILS AND WAVEFORMS ON SYSTEM TESTAND DEBUGGING1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL1) MT1379 main clock is at 27MHz(X501)2) MT1336 reset is high active- 3-8 - 3-9 -3) RS232 waveform during pr

50、ocedure(Downloading)4) Flash R/W enable signal during download(Downloading)2. SDRAM CLOCK1) MT1379 main clock is at 27MHz(X501)3. TRAY OPEN/CLOSE SIGNAL1) Tray open/close waveform- 3-10 - 3-11 -2) Tray close waveform3) Tray open waveform4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)5. LENS CONTR