LG-LXSU150-cs-sm 维修电路原理图.pdf

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1、MODEL : LX-U150X(LXU-150)SERVICE MANUALMICRO COMPONENTSYSTEMSERVICE MANUALMODEL : LX-U150X (LXS-U150)http:/RadioFans.CN 收音机爱 好者资料库- 1-1 -SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5SECTION 2. ELECTRICAL ADJUSTMENTS . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WAVEFORMS OF MAJOR CHECK POINT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . 2-5 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 WIRING DIAGRAM. . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 INTERNAL BLOCK DIAGRAM OF ICs . . . . . . . . . . . . . . . . . . . . .

6、 . . . . . . . . . . . . . . . . . . . 2-43SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1SECTION 4. SPEAKER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-

7、1SECTION 5. REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1CONTENTSRadioFans.CN 收音机爱 好者资料库- 1-2 -NOTES REGARDING HANDLING OF THE PICK-UP1.Notes for transport and storage1) The pick-up should always be lef

8、t in its conductive 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 c

9、arefully, taking care 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 r

10、easonthe adjustment 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 surf

11、aceIf there is dust 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, a cottonswab should be used, taking care not to distort this.6) Never attempt to disassemble

12、the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do notuse any other liquid cleaners, because they will damage the lens.) Take care not to use too much of thisalcohol on the swab, and do not allow the alcohol to get inside the pick-u

13、p.SERVICING PRECAUTIONSSECTION 1. GENERAL- 1-3 -NOTES REGARDING COMPACT DISC PLAYER REPAIRS1.Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These componentsare sensitive to, and easily affected by, static electricity. If such static electricity

14、 is high voltage, componentscan 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 components. Care must betaken, therefore, to avoid repair or storage where the temperature of humidity is high, where

15、strong mag-netism 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 equipment, measuring instruments and tools must be grounded.3) The workbench should be covered with a conductive shee

16、t 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) To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounded by an

17、 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 armband.7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.CLEARING MALFUNCTIO

18、NYou 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 the inside ofthe volume knob for more than 3 seconds.If you reset your unit, you must reenter all its settings(statio

19、ns, 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 cord.- 1-4 -Electrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily

20、by static electricity. Such components com-monly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated cir-cuits and some field-effect transistors and semiconductor chip components. The following techniques should beused to help reduce the incidence of

21、component damage 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 a com-mercially available discharging wrist str

22、ap device, which should be removed for potential shock reasons priorto applying power to the unit under test.2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur-face such as aluminum foil, to prevent electrostatic charge buildup or exposure of t

23、he 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 cangenerate electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals.

24、 These can generate 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 by conduc-tive foam, a

25、luminum foil or comparable 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 CHA

26、SSIS OR CIRCUIT, AND 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 can gener-ate static electricity suffi

27、cient to damage an ESD device).CAUTION. GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, ISINTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGER-OUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRICSHOCK.TH

28、E EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SER-VICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERA-TURE.ESD PRECAUTIONS- 1-5 -SPECIFICATIONSSECTIONMODELLX-U150A/D/XPower supplyRefer to the back panel of the unitGeneralPower consumption20W

29、Mass3kgExternal dimensions(WxHxD)146x238x251mmFrequency Response40 18000HzCDSignal-to-noise ratio60dBDynamic Range60dBTuning Range87.5 108.0MHz or 65 74MHz, 87.5 108.0MHzFMIntermediate Frequency10.7MHzSignal-to-noise ratio55/50dB(Mono/Stereo)Frequncy Response60 1000HzTuning Range522 1620kHz or 520 1

30、720kHzAMIntermediate Frequency450kHzSignal-to-noise ratio35dBFrequency Response100 1800HzOutput Power5W + 5WAMPT.H.D0.5%Frequncy Response60 20000HzSignal-to-noise ratio60dBTape Speed4.75cm/secWow Flutter0.3%(MTT-111, JIS-WTD)F.F/REW time120sec(C-60)TAPEFrequency Response250 8000 HzSignal-to-noise ra

31、tio40dB(P/B)/38dB(R/P)Channel Separation32dB(P/B)/30dB(R/P)Erase Ratio50dB(MTT-5511)MODELLXS-U150Type1Way 1 SpeakerImpedance4Frequency Response100 18000HzSPEAKERSound Pressure Level86dB/W(1m)Rated Input Power5WMax.Input Power10WNet Dimension(WxHxD)146x238x185mmNet weight1.4kgTUNERNOTE : Specificatio

32、n are subject to change without notice in the course of product improvement.- 1-6 -MEMOThis set has been aligned at the factory and normally will not require further adjustment. As a result, it isnot recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyo

33、netampers with 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 sp

34、ecified.5. Keep the signal input as low as possible to avoid AGC and AC action.TAPE DECK ADJUSTMENTTUNER ADJUSTMENTItemTest FrequencyTest PointAdjustmentAdjust forRemarkDC VoltageFM 98MHz 60dBuVOscilloscopeL1040V 50mVR145AM IFAM 603kHz 80dBuSpeaker outL103MaximumMaximum Waveform- 2-1 -ADJUSTMENTSSEC

35、TION 2. ELECTRICALAzimuthMTT-114Speaker outAzimuthMaximumScrewBias FrequencyTape RecTape RecL20165V 5kHzItemTest TapeTest PointAdjustmentAdjust forRemark1212- 2-2 -PIN?9?:?FSEQPIN?8?:?CEPIN?7?:?CLPIN?9?:?FSEQPIN?8?:?CEPIN?7?:?CLPIN?6?:?DIPIN?6?:?DOPIN?4?:?RESETPIN?14?:?WRQPIN?6?:?DIPIN?6?:?DOPIN 4?:

36、?RESETPIN?14?:?WRQ#1. MICOM INTERFACE WAVEFORM (PN805 PIN 3, 4, 5, 6) during power on#1. MICOM INTERFACE WAVEFORM (PN805 PIN 3, 4, 5, 6) during normal play#1. MICOM INTERFACE WAVEFORM (PN805 PIN 7, 8, 9) during power on#1. MICOM INTERFACE WAVEFORM (PN805 PIN 7, 8, 9) during normal playWAVEFORMS OF M

37、AJOR CHECK POINT- 2-3 -PIN 25 : FAOPIN 16 : FA+PIN 25 : FAOPIN 16 : FA+PIN 5 : SLINPIN 13 : SL+PIN 5 : SLINPIN 13 : SL+#2. SLED DRIVE AND MOTOR WAVEFORM (IC802 PIN 5, 13) when focus search#2. SLED DRIVE AND MOTOR WAVEFORM (IC802 PIN 5, 13) during normal play#3. FOCUS DRIVE AND MOTOR WAVEFORM (IC802

38、PIN 25, IC802 PIN 16) When focus search failed or there is no disc on tray#3. FOCUS DRIVE AND MOTOR WAVEFORM (IC802 PIN 25, IC802 PIN 16) There is disc on tray and focus search success- 2-4 -PIN 2 : RFOUTPIN 10 : FEPIN 16 : TEPIN 22 : TAOPIN 17 : TA+PIN 6 : SPINPIN 11 : SP+#5. TRACK DRIVE AND MOTOR

39、WAVEFORM (IC802 PIN 22 , IC802 PIN 17) during normal play#4. SPINDLE DRIVE AND MOTOR WAVEFORM (IC802 PIN 6, 11) when TOC reading#6. RF, FOCUS AND TRACKING ERROR WAVEFORM (IC801 PIN 2, 10, 16) during normal play- 2-5 - AUDIO PARTTROUBLESHOOTINGP-SENS PARTDoes +5V appear at ZD902?YESNOPOWER CIRCUITChe

40、ck the DC outputOf C914(+)Check the DC 9VOutput of IC903ENDNOYESNONOYESYESNOYESNOYESNOYESNOYESNOYESIC300 PIN 26 CheckCheck the FuseCheck the DC 6.02VOutput of IC902Check the 5V of Q9011 C(CD FUNCTION)Replace the fuseCheck the DC voltage ofCN901 Pin3,4 Replace the TransformerReplace the TransformerRe

41、place the D908,909910,911Check the DC voltage ofCN901 Pin 8 , Pin 9Replace the D908,909,910,911Replace the D902,903Check the High ofQ902 BReplace the Q901Check the HighOf CN601 pin7D920 , CN901 Check- 2-6 -MUTING CIRCUIT(MUTE)YESNONONOAUDIO ABNORMALYESNOYESNOYESNOYESNOYESCheck the LOW of Q701Q901, C

42、Check the Output of IC701Pin 8,12Check the waveformOf D920(+)Replace ZD902Check the SignalOutput of IC701 pin2,4Check the DC 10Vof IC601 Pin1Check the DC 9Vof IC903Check the Power CircuitCheck the speaker connectionCheck the High ofIC701 pin5Check the FUNC inputNormalDoes High appear at Q701, Q702 B

43、MUTEReplace the TR- 2-7 -FUNCTION MODE AUDIO ABNORMALNOYESNONOYESNOYESNOYESCheck the signal input ofIC601 pin3, 26TAPECheck the signal input ofIC601 pin4, 25Check the signal input ofIC601 pin6, 23Check the signal input ofIC601 pin5, 24IC601 pin12, 17 outputIC601 pin12, 17 outputIC601 pin12, 17 outpu

44、tCN201, PN201 checkIC201 pin4, 11 checkCheck signal input JK602Check the signal input of CN601 pin1, 3 and refer to CD troubleshootingIC102 pin17, 18 checkCDTUNERAUX IC601 pin12, 17 output- 2-8 -IC301 TROUBLESHOOTINGNOYESIC601 TROUBLESHOOTINGNOYESNOYESNOYESNOYESNOYESNOYESNOYESCheck the power supplyi

45、ng IC300 pin17,54,90Check the P-SENS HIGH of IC300 pin26Check the oscillation of X301When power supplying to IC300 pin11.(Low High)Refer to Power Circuit TroubleshootingCheck the P-SENSReplace the X301Check the RESET circuitCheck the power supplyingTo IC601 pin1Check the CLK Data of IC601 pin14, 15C

46、heck the Control functionENDRefer to Power Circuit TroubleshootingCheck the Data of IC300 pin6, 7(CD TAPE FUNCTION)Replace theIC201Check the patternof IC300, IC601Refer to IC300TroubleshootingReplace the IC300- 2-9 -IC103 TROUBLESHOOTINGNOYESNOYESNOYESAM COIL TROUBLESHOOTINGYESNOYESNOYESCheck the Po

47、wer input of IC103 Pin 17X104 oscillationCheck CE,DI,DO,CLKCheck the OperationENDCheck the High L102 Pin 2Replace X104D107 ,D108 ,IC902 CheckCE : Chip EnableDI : Data input (from Micom)DO : Data output (to Micom)CLK : Tuner mode clockCheck the oscillation the L102 Pin 13Refer to IC103 Troubleshootin

48、gCheck the IC102 TroubleshootingReplace to L102- 2-10 -FM(TU101) TROUBLESHOOTINGYESIC 102 TROUBLESHOOTINGNONOYESYESNONOYESNO YESNOYESYESYESNOYESYESNOCheck the 10V input of TU101 Pin 6Check the High of TU101 Pin5Check the Power input of IC102 pin8Check the 10V of Q102 ECheck the OSC waveform ofTU101

49、pin8Refer to IC102 TroubleshootingCheck the waveform of IC102 pin16, 17Check the LOW of IC103 pin7Replace the Q102Refer the TU101Check the Power circuitRefer to IC103TroubleshootingCheck the waveform of IC102 pin20, 21IC903,D105,D106 CheckCheck the FM(TU101) ,AM(L102)Replace the IC102Replace the IC1

50、03Check the LOW ofIC102 pin13Refer to IC103TroubleshootingEND- 2-11 -DECK PLAYNOYESNOYESRECORDINGYESNOYESNOYESCheck the B+ Power to Leaf SwitchIC201 signal check Pin 4 , Pin 11Check the signal outputIC201 Pin 4 , Pin 11PN202 CheckSW202 CheckCheck PN201 , Q201Audio output ( PN201 Pin 8 , Pin 9 )Check