LG-LMW550A-cs-sm 维修电路原理图.pdf

《LG-LMW550A-cs-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《LG-LMW550A-cs-sm 维修电路原理图.pdf（49页珍藏版）》请在收音机爱好者资料库上搜索。

1、3CD CHANGER DVDSERVICE MANUAL MODEL: LM-W550A LM-U550D LMS-W550SERVICE MANUAL MODEL: LM-W550A LM-W550A, LM-U550D LMS-W550 RadioFans.CN 收音机爱 好者资料库- 1-1 -CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2、ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. ELECTRICAL SECTION TROUBLESHOOTIN

3、G GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 AUDIO PART TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . 2-21 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 WIREING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 PRI

5、NTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK

6、) . . . . . . . . . . . . . . . . . . . . . . . . .3-3 TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5 CD MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7 SECTION 4.

7、 SPEAKER PART SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-

8、1RadioFans.CN 收音机爱 好者资料库- 1-2 - SERVICING PRECAUTIONS NOTES 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-up should never be subjected to external pressure or impact.2. Repair n

9、otes1) 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 is subjected to strong pressure or impact, the result may be an operati

10、onal 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 never be touched.4) Laser beams may damage the eyes!Absolutely never

11、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 away by using an air bush (such as usedfor camera lens).The lens is h

12、eld 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 the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Donot use any other li

13、quid 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.Storage in conductive bagDrop impactNEVER look directly at the laser beam, and dont let contact fingers or other exposed skin.MagnetHow

14、to hold the pick-upConductive SheetCotton swabPressurePressureSECTION 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

15、 electricity. If such static electricity 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

16、 temperature of humidity is high, where strong magnet-ism 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

17、 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) To prevent AC leakage, the metal part of the soldering iron should be gro

18、unded.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 sta-tic electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should NEVER be directly faci

19、ng 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 the inside ofthe volume knob for more than 3 seconds.If you reset your un

20、it, 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 cord.Resistor(1 Mohm)ConductiveSheetResistor(1 Mohm)ArmbandRESET jump wir

21、eVOLUMEVOLUME KNOBDOWNUP- 1-4 - ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integratedc

22、ircuits 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 semiconductor component or semiconductor-equipped assembly, drain offany

23、 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 power to the unit under test.2. After removing an electrical assembly equip

24、ped with ESD devices, place the assembly on a conductive sur-face 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 devices.4. Use only an anti-static solder removal device. Some solder remov

25、al 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 remove a replacement ESD device from its protective package until immediate

26、ly before you areready to 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 protective material from the leads of a replacement ESD device, touch thep

27、rotective 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 ALLOTHER SAFETY PRECAUTIONS.8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motio

28、nsuch as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen-erate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLSTHE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TOALERT THE SER

29、VICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THATMAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PER-SONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITE

30、RATURE.- 1-5 - SPECIFICATIONSNOTE : Specification are subject to change without notice in the course of product improvement.- 1-6 - 2-1 -VKK CHECKP-SENS PART CHECKCN701 3PIN DC -33V checkIC301 51PIN voltage checkSMPS Assy CN942 5PIN 5V operation checkMAIN PCB CN701 5PIN 5VMAIN PCB CN301 4PN 5V check

31、Refer to SMPS TroubleshootingRefer to SMPS TroubleshootingCN701 contact condition checkMAIN PCB PATTERN disconnection check TROUBLESHOOTING GUIDEYESYESNONOFRONT PN301 4PIN 5V checkFRONT IC304 operation status checcku-COM 26PIN 5V checkYESYESYESYESYESYESNONOInput voltage 4V or higer, output voltage2.

32、1V or higer operation checkIC304 KIA7042 replacementSECTION 2. ELECTRICAL- 2-2 -Muting circuit Troublrshooting (MUTE condition)Q752(A102) Base “HIGH”Q604, Q605(D1302) BASE “HIGH” checkc-COM operation status checkReplace each related TRQ603(A102) operation status checkReplace when Q603(A102) is defec

33、tivec-COM 2PIN(A-MUTE) LINE checkCN942/CN701 connection statuscheckMUTEYESYESYESYESNONONOUnfelt voiceInput check (AUX 9.36 TUNER 6/39 TAPE 7/38CD 8/37PIN)Check input and operation status for each functionYESNOIC601 20/25PIN output checkRefer to IC401(NJW1190) IC specificationYESNOIC601 input check (

34、22/23PIN)c-COM check and (CLK/DATA check)YESNOIC601 output check (24PIN)NORMALCheck IC401 24PIN cover 8V and power circuitYESNOPower operation staus check (DC12V)R634 180(9.1)V checkYESYESNO- 2-3 -Specific FUNCTION MODE unfelt voiceTAPEIC202 9PIN (PB MUTE) operation checkc-COM 301 3.4PIN CLK/DATA op

35、eration checkDECK HEAD WIRE connection status checkRefer to IC201 Troubleshooting IC201 input check (HAED input) “A”DECK 32,39 “B”DECK 34,37YESYESNOIC202 14PIN HIGH operation checkQ212(A102) BASE LOW checkQ201.202(GATE) HIGH operation checkNOIC201 output check (5, 26PIN)IC401 7, 38 signal input chec

36、kYESNOReplace IC202YESNOQ212(A101) EMITTER 5V checkQ213(C103 COLLECTOP LOW) operation checkReplace Q213(C103)YESNOYESQ201,202 (DRAIN) GND checkYESReplace defective partsYESQ212(A102) COLLECTOR 5V operation checkYESReplace defective partsYESNOAA- 2-4 -AUXJK601 signal input checkIC401 9,36PIN signal i

37、nput checkYESYESMICIC401 1PIN input checkRefer to IC404 Toubleshooting YESYESTUNERRefer to TUNERMODULEIC401 6,39PIN signal input checkYESYESCDCheck CN601 1,3PIN signal anad Refer to CD TroubleshootingIC601 8,37PIN signal input checkYESYESMAIN PCB PATTERN checkNOB- 2-5 -IC301 TroubleshootingMIC PCBIC

38、406 6PIN power check and 2PIN input checkYESMIC input pattern disconnection check andafter MIC insertionNOIC406 7PIN output checkYESMIC MUTE operation status checkNOPN401 3PIN output checkYESNORMALYESIC406 7PIN output checkNOReplace IC406NOCheck PN401 connection statusand IC301 20PIN status checkNOJ

39、K401 input checkQ302 collector HIGH operationcheckQ302 (Replace C102)IC301 17,46,72,90 power impression checkSMPS power 5V checkYESNOPN301 20PIN 5V impression chckPN301 4PIN 5V P-SENS terminal checkYESNOX301 ossillates or not?Replace X301YESNOWhen IC301 11PIN power insert High LOW HighReplace IC301R

40、eset circuit checkYESNOQ302(C102M) operation staus checkNORMALYESYESNOB- 2-6 -IC401 (NJW1190) TroubleshootingIC401 24PIN power impression checkRefer to SMPS power checkYESNOIC401 22,23 Pulse waveform check (VOL UP,DOWN check while rotating VOL UP, DOWNIC401 20,25 PIN waveform output checkIC301 10,8P

41、IN checkIC401 7,37PIN(TAPE) input waveform checkYESYESYESYESNOReplace IC601NOIC401 6,39(TUNER) PIN input waveform checkTAPE TroubleshootingNOIC401 8,37(CD) PIN input waveform checkTUNER module replacementNOYESNOIC401 9, 36(AUXO input waveform checkCD TroubleshootingNomalReplace IC401NOMICOM(10,8) -

42、IC601(21,22) PATTERN checkYESIC301 TroubleshootingNOIC302, 202 (BU2090) TroubleshootingIC301, 201 16PIN power impression checkSMPS power checkYESNOIC302,202 95,2,3PIN CLK data checkCONTROL function checkIC301 95,34,4PIN data check(When switching CD, TAPE FUNCTION)NORMALYESYESNOReplace IC302, 202IC30

43、1, IC501 PATTERN checkNOPattern check between IC301 and IC501YESRefer to IC301 Troubleshooting NO- 2-7 -AMP MODULE TroubleshootingPN301, PN702 assembly status check1. PN301(7,8), PN702(13,14) PWM DATA.CLK operation status check, PN301PWM/CS534012PIN STA518A PWDN25 check2. PN702:13PWM_SDA, 14PWM_SCL

44、checkYESNOYESNOPN 7PIN 3.3V check power check12.288MHz oscillation check27PIN 3.3V checkYESYESYESYESYESYESSMPS power checkCS5340 2PIN MCLK/PS9813 48CLK_INReplace when 12.288 is defectiveNOIC702 41, 42, 43, 44 operation status checkSMPS power checkNOIC801 power cehckIC801 25,28PIN RESET checkNORMALOK

45、SMPS 32V power checkNOIC301 79,81 PN301 12,14PIn checkNOPlay checkIC201 16PIN VCC power impressionIC201 5, 26PIN Signal Output checkIC201 14PIN Muting circuit checkRefer to SMPS power cehckReplace IC201Replace Deck MechaDeck Mecha operation performance checkYESYESYESNONONO- 2-8 -Rec check (Q252, Q20

46、2 ON :R273, R223 High)IC401 11,34 OUT checkIC401 each input 6, 39.TAPE. 7, 38. CD 8,38 AUX9.36PIN signal input checkIC201 7,24PIN input checkIC201 10,21PIN output checkREC input checkInput LINE checkYESYESYESNONOL203 2,3PIN oscillation checkAfter REC output check, Replace defective ICYESNOYESNOYESNO

47、YESNOYESNOIC202 14PIN operation status checkIC202 4PIN operation checkQ205 Base 0.6V impression checkYESQ213, 212 operation status checkYESDECK replacementYESNORefer to power checkQ204 Collector LowIC202 Troubleshooting checkQ203 replacementQ204 replacementNORMALL203 replacement- 2-9 -Dubbing check

48、(“NORMAL or REC”/“HIGH”)IC401 11,34 OUT checkIC401 each input TUNER 6, 39 TAPE 7, 38 CD 8, 38 AUX9, 36 PIN signal input checkIC201 7, 24PIN input checkIC201 10,21PIN output checkREC input checkInput LINE checkYESYESYES- 2-10 - INTERNAL BLOCK DIAGRAM of ICs CS5340BLOCK DIAGRAM NJW1190BLOCK DIAGRAM- 2

49、-11 -PIN FUNCTION (QFP48-P1) - 2-12 - PS9813BLOCK DIAGRAM Pin AssignmentPWM_CH2_MCVDD2DVSS3PWM_LOL_MMSDINMBCKPLL_AVSSPLL_AVDDMLRCKNRESETMIC_BCKSLRCKSSDINSBCKEPD_ENAMIC_LRCK2122231920161718141589101112136745463031323334353637282933839404142434445PWM_HP_LPWM_LOR_MDVDD2DVDD1PWM_CH1_MDVSS2PWM_CH2_PPWM_C

50、H3_PPWM_CH3_MPWM_LOR_PPWM_LOL_POVERLOADPLL_DVDDTEST_MODE2TEST_MODE1SCLSACLK_INDVSS1MCLKSDA2726484721MIC_SDIN24PWM_CH1_P25PS9813PLL_DVSSPLL_EXT_LPFCVDD1VSSPWM_HP_RPLL_AGSN.C.DVDD3VSS- 2-13 -Pin Descriptions - 2-14 - - 2-15 - AM5810 (IC802)BLOCK DIAGRAMPin configuration - 2-16 -Pin Description - 2-17