LG-LPCLM445-pr-sm 电路图 维修手册.pdf

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1、MP3/CD LOGIC DECK CASSETTE RECORDER SERVICE MANUAL MODEL: LPC-LM440A/X LPC-LM445A/X SERVICE MANUAL MODEL: LPC-LM440A/X LPC-LM445A/X RadioFans.CN 收音机爱 好者资料库 - 1-1 - CONTENTS SECTION 1.GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 IDENTIFICATIONS OFCONTROLS . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 SECTION 2.ELECTRICAL SECTION ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 INTERAL BLOCK DIAGRAM OF ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 IC/TR VOLTAGE & PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 BLOCK

5、DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41 PRINTED CIRCUIT BOARD DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SECTION 4. REP

7、LACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 RadioFans.CN 收音机爱 好者资料库 - 1-2 - SECTION 1. GENERAL 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 immedi

8、ately prior to use. 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

9、external pressure 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 a

10、nd 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 surface If there is dust on

11、 the lens surface, 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

12、by excess pressure. 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. Storage in con

13、ductive 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 Conductive Sheet Cotton swab Pressure Pressure RadioFans.CN 收音机爱 好者资料库 - 1-3 - NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc

14、players incorporate 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 i

15、s composed of many 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 magnet- ism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component p

16、art, first disconnect 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. (T

17、his is because 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

18、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 facing the eyes or bare skin. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband - 1-4 - ESD PRECAUTIONS Electrostatically Sensitive Devices

19、 (ESD) Some semiconductor (solid state) 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

20、following techniques should be 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 off any electrostatic charge on your body by touching a known earth ground. Alternat

21、ively, obtain and wear a commercially 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 sur- face such as

22、 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 removal devices not classified as anti-static can generate electrical charge

23、s sufficient to damage ESD devices. 5. 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 device

24、s are packaged with leads electrically 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 whic

25、h the device will by installed. CAUTION : 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 th

26、e lifting of your foot from a carpeted floor can gen- erate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN- GERO

27、US VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. - 1-5 - SPECIFICATIONS General CD TAPE Power

28、supplyRefer to the back panel of the unit. Power consumption40W Mass External dimensions (W x H x D)456 x 178 x 338 mm Output Power 5W X 2 , 10W Speakers3.2 X 3 Battery OperationDC 12V, 8 “D”(R20) batteries (not supplied) Frequency response 100 - 18000 Hz Signal-to-noise ratio 65 dB T.H.D% Tuning Ra

29、nge87.5 -108 MHz, 65 -74 MHz or 87.5 -108 MHz Intermediate Frequency10.7 MHz AntennaTelescopic antenna Tuning Range 522 - 1620 kHz or 520 - 1720kHz Intermediate Frequency450 kHz AntennaFerrite bar antenna Recording System4 Tracks 2 channel stereo Frequency Response125 - 8000Hz Signal to Noise Ratio4

30、0/45dB (REC/PLAY) Designs and specifications are subject to change without notice. MODEL SECTION Tuner AM FM (MW) LPC-LM440A LPC-LM445A 5.1kg 0.5 - 1-6 - IDENTIFICATIONS OF CONTROLS Front Front - 1-7 - Rear Panel Remote Control Bottom Panel - 1-8 - - 2-1 - SECTION 2. ELECTRICAL ADJUSTMENTS 1.TAPE DE

31、CK ADJUSTMENT DECK MODETEST TAPETEST POINTADJUSTMENTADJUST FOR PLAY BACKMTT-114L/R OutputL/R Maximum 2.RECORD BIAS ADJUSTMENT DECK MODETEST TAPETEST POINTADJUSTMENTADJUST FOR AUTO-RVS75KHz5KHz AUTO-STOP65KHz5KHz 3.TAPE SPEED ADJUSTMENT DECK MODETEST TAPETEST POINT ADJUSTMENTADJUST FOR PLAYBACKMTT-11

32、1L/R Output3kHz50Hz Azimuth adjusting screw SR490 REC MODEMTT-5511 C465 OR C415(DECK CIRCUIT B- POINT) L405 - 2-2 - TROUBLESHOOTING GUIDE CD PART TURN ON CD OPEN CLOSE CHECK CONNECTOR CHECK (PN813) “READING” DISPLAY CHECK CONNECTOR CHECK (PN802,PN806) CHECK MICOM INTERFACE CIRCUIT (PN805) READING OK

33、 CHECK CONNECTOR CHECK (PN801) CHECK PICKUP MOVEMENT CHECK AM5810FP (IC802) CHECK LC78690N (IC801) CONNECTOR CHECK (PN806 Pin1 & Pin3) IF PLAY, AUDIO OUTPUT CHECK OK YES YES YES YES NO NO NO NO NO NO NO - 2-3 - OPEN COLOSE NG “READING ”DISLPAY CHECK (=ONLY “CD ”DISPLAY) DOOR OPEN/CLOSE DISLPLAY CHEC

34、K OPEN/CLOSE S/W CHECK DEFECTIVE CONNECTOR OR MAIN POWER SUPPLY DEFECTIVE IC804 DEFECTIVE MICOM OR DSP &14P FFC CABLE IC801 PIN=18 CHECK “2.45V” PICK-UP UNIT OR Q801 DEFECTIVE MAIN BD CHECK Q102 “C ” 4.6V) Check Q101 “B ”4.5V CONNECTOR LOCKING CHECK (PN813) AD 5V CHECK(PN805 Pin3) CONNECTOR LOCKING

35、CHECK (PN801,PN805,PN802,PN806) CHECK POWER SUPPLY (MAIN PN251) PN251 PIN 5=6.2V ,PIN 7=6.2V CHECK VOLTAGE CD BD IC804 Pin3=6.2V,Pin 2&4=3.3V CHECK INTERFACE WITH MICOM MAIN CN111 Pin 6,7,8,9 ,10,11,12 ,13 LASER ON CD BD PN801 Pin 10=1.96V NO NO NO NO NO NO NO YES YES YES YES YES YES - 2-4 - READING

36、 OK CHECK (=“NO DISC ”DISPLAY) CONNECTOR LOCKING CHECK(PN801) CHECK PN802 Pin3,4 (SL+,SL-) CHECK PN801 Pin13,16 (FA-,FA+) CHECK PN802 Pin5,6 (SP+,SP-) CHECK PN801 Pin14,15 (TA+,TA-) CHECK PN801 Pin10(LD) DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICK-UP OR IC802

37、 OR IC801 DEFECTIVE PICKUP OR IC802 OR IC801 DEFECTIVE PICKUP OR IC801 OR Q801 DOES SLED MOVE? DOSE LENSE MOVE? (UP&DOWN) DOSE LASER LIGHT? DOES SPINDLE ROTATE? IS READING OK? YES YES YES NO NO NO NO NO NO NO NO NO NO YES YES A B C D E - 2-5 - READING OK CHECK #A(=“NO DISC ”DISPLAY) DOSE SLIN WAVEFO

38、RM APPEAR AT (IC802 Pin5) DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICK-UP SLED MOTOR DEFECTIVE PN802 CONNECTOR DOSE SL+WAVEFORM APPEAR AT(IC802 Pin13 ) SLED MOTOR WAVE CHECK PN802 CONNECTOR LINE YES NO NO NO NO NO A - 2-6 - READING OK CHECK #B(=“NO DISC ”DISPLAY) DOSE FAIN WAVEFORM APPE

39、AR AT (IC802 Pin22) DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICK-UP FOCUS ACTUATOR DEFECTIVE PN801 CONNECTOR DOSE FA+WAVEFORM APPEAR AT(IC802 Pin16 ) FOCUS COIL DRIVE WAVE CHECK PN801 CONNECTOR LINE YES NO NO NO NO NO B - 2-7 - READING OK CHECK #C(=“NO DISC ”DISPLAY) Q801 EMITTER VOLTAG

40、E CHECK .3.1V O.K LASER CONTROL VOLTAGE CHECK IC801 Pin 18.2.45 DEFECTIVE IC801 DEFECTIVE IC801 DEFECTIVE Q801 DEFECTIVE PICK-UP FOCUS ACTUATOR DEFECTIVE PN801 CONNECTOR Q801 VOLTAGE CHECK .1.96V CHECK PN801 CONNECTOR LINE YES YES NO NO NO NO NO NO C - 2-8 - READING OK CHECK #D(=“NO DISC ”DISPLAY) D

41、OSE SPIN WAVEFORM APPEAR AT (IC802 Pin6) SPINDLE DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICK-UP SPINDLE MOTOOR DEFECTIVE PN802 CONNECTOR DOSE SP+WAVEFORM APPEAR AT(IC802 Pin11) SPINDLE MOTOR DRIVE WAVE CHECK PN802 CONNECTOR LINE YES NO NO NO NO NO D - 2-9 - READING OK CHECK #E(=“NO DIS

42、C ”DISPLAY) DOSE TAIN WAVEFORM APPEAR AT (IC801 Pin23) TRACKING DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC802 DEFECTIVE PICKUP OR IC801 DEFECTIVE PN801 CONNECTOR DOSE TA+WAVEFORM APPEAR AT(IC802 Pin17 ) TRACKING COIL DRIVE WAVE CHECK PN801 CONNECTOR LINE DOSE RF SIGNAL APPEAR? (IC801 PORT2) WAVEFORM#6

43、YES NO NO NO NO NO E - 2-10 - MAIN POWER Main Power input (AC-cord in) LCD Display ”Hello” Check the Voltage-selector 110V/230V (Duble Voltage only) Check the DC out of C202(+) Check the FuseReplace the Fuse Replace D201,D202,D203D204 Check theD901,D902, D903,D904(POWER BD) Q251 Emittor Voltage Chec

44、k(.9.6V) REPLACE Q251 REPLACE IC271 POWER SENSE BLOCK CHECK RESET BLOCK CHECK REPLACE D181, D182,D183 REPLACE X102 REPLACE MICOM IC (IC101 LC877480) IC271 Vout Voltage Check(.5.2V) Q265 Collector Voltage Check(.5V) Q173 Collector Voltage Check(.4.6V) D181,D182,D183 Cathode Voltage Check(4.6V) OSC CH

45、ECK(X102:9.8304MHz) NO NO YES NO NO NO NO NO NO NO NO - 2-11 - MUTING CIRCUIT(MUTE) FUNCTION MODE AUDIO ABNORMAL Dose “HIGH ”appear at Q601,Q651,Q256(SUB-W)“B ” Check the “HIGH ”of the IC101 Pin 9,47 Check the IC101 Check the pattern Replace the Q601,Q651, Q256 Check the signal input of PN251 “R-CH

46、”“L-CH ” Check the CD BD Check the “LOW ”of Q601, Q605,Q256 “E ” MUTE TAPE FUNCTION Check the signal input of IC301 Pin 3,26 Refer to “TAPE Trouble Shooting ” CD FUNCTION MUTECheck the signal input of IC301 Pin 6,23 TUNER FUNCTION Check the signal input of IC301 Pin 4,25 Refer to “Tuner Pack Trouble

47、 Shooting ” NO NO NO NONO YES YES YES YES YES YES YES YES - 2-12 - IC301 TROUBLESHOOTING Check the Power supplying to IC301 pin 1 Check the DC Output of Q301(.6.8V) Check the Pattern Replace the IC301 Check the IC101 Check the Data of IC101 pin 6,7 CD TAPE Function) Check the CLK Data of IC301 pin 1

48、4,15 Check the IC101 Function Selector END NO NO NO NO YES YES YES YES - 2-13 - TUNER PACK TROUBLESHOOTING Check the Tuner Power of PN403 Pin 2 “Tu-B+” Check the DC output of “HIGH ”Q231 “C ” Check the “high ” Q232 “B ” Check the DC output Q233 “E ”,pattern CE :Chip Emable DI :Data Input(From u-com)

49、 DO :Data Output(to u-com) CLK :Tuner Mode Clock Replace Tuner pack or Micom 35,36,37,38 Check Is the normal? END NO NONO YES YES YES - 2-14 - TAPE TROUBLESHOOTING 1) Play Check the power supplying to IC401 Pin16 Check the DC output Q241 “C ” Check the “high ” IC101 Pin92 or Q242 “B ” Check the pattern Q405 “C ”Voltage Check(8.5V) PN402 Pin 3 Voltage Check(12.5V) Q407,Q489 Check PN402 Pin1 Pin2 Check(Normal Speed:Q483,+10%:Q481,-10%:Q485) Q487 “C ”Voltage Check:When solenoid is drived Check the patternCheck(PB MUTE “Low ”REC MUTE “High