LG-LMM1030A-cs-sm 电路图 维修手册.pdf

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1、3CD CHANGER HI-FI SYSTEM SERVICE MANUAL MODEL: LM-M1030A/D/X, LMS-M1030 SERVICE MANUALMODEL: LM-M1030A/D/X, LMS-M1030 REVISION RadioFans.CN 收音机爱 好者资料库 - 1-1 - CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS1-2 ESD PRECAUTIONS1-4 SPECIFICATIONS1-5 SECTION 2. ELECTRICAL ADJUSTMENTS2-1 TROUBLESHOOTIN

2、G2-3 WAVEFORMS OF MAJOR CHECK POINT2-15 BLOCK DIAGRAM2-27 SCHEMATIC DIAGRAMS2-29 WIRING DIAGRAM2-37 PRINTED CIRCUIT DIARGAMS2-39 INTERNAL BLOCK DIAGRAM OF ICs2-49 REPAIRS REGARDING CD MECHANISM2-58 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3-1 TAPE DECK MECHANISM: AUTO STOP DECK(OPTIO

3、NAL)3-3 TAPE DECK MECHANISM: AUTO REVERSE DECK3-5 CD MECHANISM3-7 SECTION 4. SPEAKER4-1 SECTION 5. REPLACEMENT PARTS LIST5-1 RadioFans.CN 收音机爱 好者资料库 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

4、 bag until immediately 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, taki

5、ng care to avoid 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 a

6、djustment 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 surface If

7、 there is dust on 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 th

8、e pick-up. Spring 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-

9、up. - 1-2 - Storage in conductive 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 SECTION 1. GENERAL RadioFans.CN 收音机爱 好者资料库 NOTES REGARDING COMPACT DISC PLAYER REP

10、AIRS 1. Preparations 1) Compact disc 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

11、be handled with care. 2) The pick-up is 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 magnetism is present, or where there is excessive dust. 2. Notes for repa

12、ir 1) Before replacing a component part, 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

13、not place the pick-up on the bag. (This 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

14、 come in contact with clothing, in order to prevent static 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(but

15、ton malfunction, display, etc.). Using a pointed good 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

16、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. - 1-3 - Armband Conductive Sheet Resistor (1 Mohm) Resistor (1 Mohm) VOLUME KNOB UP DOWN VOLUME RESET jump wire ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) So

17、me 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 followin

18、g 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. Alternatively, o

19、btain 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 surface such as aluminum

20、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 charges sufficie

21、nt 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 devices are pac

22、kaged 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 which the dev

23、ice 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 the lifting

24、 of your foot from a carpeted floor can generate 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 “DANGEROUS VOLTAGE” T

25、HAT 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. - 1-4 - - 1-5 - SPECIFICATIONS LM-M1030A/D/X LMS-M1030 - 1

26、-6 - MEMO - 2-1 - TAPE DECK ADJUSTMENT 1. AZIMUTH ADJUSTMENT Figure 1. Azimuth Adjustment Connection Diagram CH1 CH2 Speaker Out Playback Mode Head Test Tape MTT-114 L ch R ch GND Dual-trace synchroscope Electronic Voltmeter L out R out Unit ADJUSTMENTS This set has been aligned at the factory and n

27、ormally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary. IMPORTANT 1. Check Power-source voltage. 2. Set the function switch to

28、 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 specified. 5. Keep the signal input as low as possible to avoid AGC and AC action. Deck ModeTest TapeTest PointAdjustmentAdjust

29、for A Deck PlaybackMTT-114Speaker Out DECK Screw Maximum Azimuth Screw B Deck PlaybackMTT-114Speaker OutAzimuth ScrewMaximum 2. MOTOR SPEED ADJUSTMENT Figure 2. Motor Speed Adjustment Connection Diagram Head Playback Mode Unit Speaker Out GND L out R out Record/Playback head Test Tape MTT-111 Freque

30、ncy Counter Deck ModeTest TapeTest PointAdjustmentAdjust forRemark Normal SpeedMTT-111Speaker OutVR5013kHz 1%A Deck HI-SpeedMTT-111Speaker Outmore than 5.4kHzHI-Speed Dubbing Mode SECTION 2. ELECTRICAL - 2-2 - 3. RECORD BIAS ADJUSTMENT Head Unit PN202 GNDRecord/Playback head Test Tape MTT-5511 Recor

31、d/Playback and Pause Mode Frequency Counter Deck ModeTest TapeTest PointAdjustmentAdjust for Rec/PauseMTT-5511 ERASE HEAD L203 60kHz5kHz (Auto stop) WIRE(PN202)85kHz5kHz(Auto Reverse) Figure 3. Record Bias Adjustment Connection Diagram - 2-3 - TROUBLESHOOTING TURN ON CD CONNECTOR CHECK ( PN808,PN807

32、 ) CHECK POWER SUPPLY CIRCUIT( PN808 ) CHECK MICOM INTERFACE CIRCUIT( PN807 ) CHECK MICOM INTERFACE CIRCUIT( PN807 ) CONNECTOR CHECK(PN801,PN802) CHECK PICKUP MOVEMENT CHECK BA5810FP (IC803) CHECK MN6627933CG (IC801) CHECK AN22004 (IC802) CONNECTOR CHECK (PN808) CONNECTOR CHECK ( PN808,PN807,PN802,P

33、N801 ) OPEN CLOSE CHECK “ READING ” DISPLAY CHECK READING OK CHECK IF PLAY, AUDIO OUTPUT CHECK OK NO NO NO NO YES YES YES YES YES CD PART - 2-4 - OPEN CLOSE NG CONNECTOR LOCKING CHECK ( PN808,PN807 ) DEFECTIVE MAIN POEWR SUPPLY DEFECTIVE MICOM DEFECTIVE IC803 DEFECTIVE MECHANISM CHECK POWER SUPPLY C

34、IRCUIT( PN808 ,PN807) PN808 PIN 5 = 6.2V, PIN 7 = 5V PN807 PIN 1 = 5V CHECK VOLTAGE CHANGE OF OPEN CLOSE , AND BTLMUTE VOLTAGE(= 5V) (PN807 PIN 20:OPEN, 19:CLOSE, 4:BTLMUTE) CHECK VOLTAGE CHANGE LO+, LO- OF IC803 (PN807, PIN OPEN:20, CLOSE:19) YES YES YES NO NO NO NO - 2-5 - “ READING ” DISPLAY CHEC

35、K (= ONLY “CD “DISPLAY) CONNECTOR LOCKING CHECK (PN808,PN807,PN802,PN801 ) DEFECTIVE CONNECTOR OR MAIN POWER SUPPLAY DEFECTIVE IC805 DEFECTIVE MICOM OR CONNECTOR DEFECTIVE MICOM OR CONNECTOR DEFECTIVE IC801 CHECK VOLTAGE THE PIN 2 OF IC805 IC805 PIN2 : 3.3V CHECK RESET SIGNAL OF PN807 PN807 PIN12 :

36、5V CHECK POWER SUPPLY PORT( PN808 ,PN807) PN808 PIN 5 = 6.2V, PIN 7 = 5V PN807 PIN 1 = 5V CHECK POWER SUPPLY PORT( PN808 ,PN807) PN808 PIN 5 = 6.2V, PIN 7 = 5V PN807 PIN 1 = 5V CHECK MICOM INTERFACE CIRCUIT( PN807 ) PN807 PIN 11,13,14,15 SIGNAL CHECK (11: STAT, 13: MDATA, 14:MCLK, 15:MLD) CHECK THE

37、WAVE FORM #1 YES YES YES YES YES NO NO NO NO NO - 2-6 - READING OK CHECK (= “NO DISC” DISPLAY) A A A A B B B B C C C C D D D D E E E E CONNECTOR LOCKING CHECK(PN801,PN802) DOES SLED MOVE ? CHECK PN802 PIN 3,4( SL+,SL-) DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 DEFECTIVE PICKUP OR IC803 OR IC801 OR

38、 IC802 DEFECTIVE PICKUP OR IC803 OR IC801 DEFECTIVE PICKUP OR IC802 DEFECTIVE PICKUP OR IC803 DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 CHECK PN802 PIN 10( LD ) CHECK PN801 PIN 14,15 (TA- ,TA+) CHECK PN802 PIN 5,6( SP+,SP-) CHECK PN801 PIN 13,16 ( FA-, FA+) DOES LENSE MOVE ? (= UP When focus se ar

39、ch f ailed or there is no disc on tray ; There is disc on tray and focus search success PN807: MLD PN807: MCLK PN807: MDATA PN807: STAT IC803: SLIN IC803: SL+ TP86X IC803: FA+ TP86X IC803: FA+ - 2-16 - #5. T RACK DRIVE AND MOTOR WAVEFORM (TP860, IC803 pin23) durin g normal play #4. SPINDL E DRIVE AN

40、D MOTOR WAVEFORM (IC803 pin 6, 2) when TOC reading IC803: SPIN IC803: SP+ TP 860 IC803: TA+ #6. RF, TRA CKING AND FOCUS ERROR WAVEFORM (IC802 pin 8, 2 , 23) during normal play IC802: ARF IC802: TE IC802: FE - 2-17 - MAIN SET VKK PART Does DC - 33V appear at CN302 Pin . Check the voltage of IC301 pin

41、87 Dose -33V appear at ZD902(-) Check Q903 TURN ON Check the pattern Replace Q903 Refer to power circuit END Check the -33V(Lower) of C916(-) Replace the ZD902 Replace D912, D911 YES YES YES YES YES NO NO NO NO NO P-SENS PART Does +5V appear at ZD901(+)? Check the pattern of IC301 Pin . Check the wa

42、veform of D913(+). Check R943 and replace ZD901 Replace D913 YES YES NO NO 6 28 - 2-18 - Power Circuit Check the Fuse Check the DC output of C901(+), C951(-) Check the DC Output of C903(+) Check the output of IC901, IC902 Check the DC 12V Output of IC903 Check the 5V of CN513 pin 7 (CD FUNCTION) END

43、 Replace the Fuse Check the AC Output of CN901 pin1, 5 Check the AC Output of CN701 PIN 1, 9, 10 Replace IC904 Replace the D901, D902, D903, D904 Check the IC901, IC902 Check the “5V” of IC501 pin5 Check the “Low” of Q904 “B” Replace Q904 Replace the Transformer Replace the Transformer Check the 5V

44、of IC301 or check PN301/CN302 pin3 Check the “HIGH” of IC501 pin 14 Check the “HIGH” of Q905 “B” Check the IC501 and Replace YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO NO NO NO - 2-19 - Audio abnormal Check the output of IC601 Pin 24, 25 Refer to “IC601 Troubleshooting” Refer to

45、 “Muting Troubleshooting” Check the 10V(Higher) and power circuit Check the input of IC601 pin 28, 29, 30, 31, 34, 35, 36, 37 Check the Output of IC601 OK YES YES YES NO NO NO Muting circuit (MUTE) Dose “Low” appear at Q602 “B” Check the “HIGH of” Q601, Q651 “B” Refer to IC202 Troubleshooting (ONLY

46、Q201, Q251) MUTE Check the connector of Q602 “B” & GND YES YES NO NO - 2-20 - FUNCTION MODE Audio abnormal TAPE Check the signal input of IC601 pin 28, 37 Refer to IC202 Troubleshooting AUX Check the signal input of IC601, pin 29, 36 Check the signal input of JK102 Check the signal input of IC601 pi

47、n 31, 34 Check the signal of CN513 pin1, 3 or Refer to CD Troubleshooting Check the signal input of IC601 pin 30, 35 Refer to TUNERMODULE CD Tuner Check the OW601 Refer to IC404 Troubleshooting MIC - 2-21 - Refer to IC301 Troubleshooting IC301 Troubleshooting IC501 Troubleshooting Check the power su

48、pplying IC301 Pin 31, 32, 51, 88? Refer to Power Circuit Troubleshooting Check the P-SENS Replace X301 Check the RESET circuit Refer to Power Circuit Troubleshooting Check the Data of IC301 Pin 13, 14 (CD TAPE FUNCTION) Replace IC501 Check the pattern of IC301 & IC501 Check the 5V of IC301 pin6 Chec

49、k the oscillation of X301 Check the “Low” “High” of IC301 pin88 when power supplied Replace IC301 Check the power supplied to IC501 pin 16 Check the CLK Data of IC501 pin 2, 3 Check the CONTROL function END YES YES YES YES YES YES YES NO NO NO NO NO NO NO - 2-22 - IC701 Troubleshooting IC601 Troubleshooting Check the power supplied to IC601 pin39 Refer to “Power Circuit Troubleshooting” Check the IC301 pin 15, 16, 75, 76 Check the PATTERN of MICOM (82, 83) & IC401 (21, 22) Check the Pulse waveform of IC601 pin21, 22(VOL DIAL) Check t