LG-LHTK250-cdr-sch 电路图 维修手册.pdf

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1、1-1 CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATIONS . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . 2-20 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 SECTION 3. DVD & AMP PART ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DVD PART SCHEMATIC DIAGRAMS . . .

5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. RE

6、PLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 RadioFans.CN 收音机爱 好者资料库 1-2 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 immediately prior to use. 2)

7、 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 external pressure and

8、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 and installation screws

9、 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 the lens surface, the

10、 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 cot- ton swab should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up. Spring by excess pressure.

11、 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 conductive bagDrop imp

12、act 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 SECTION 1. GENERAL RadioFans.CN 收音机爱 好者资料库 1-3 NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc play

13、ers 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 is c

14、omposed 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 part

15、, 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. (This

16、 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 ord

17、er 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. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband RadioFans.CN 收音机爱 好者资料库 1-4 ESD PRECAUTIONS Electrostatically Se

18、nsitive Devices (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

19、components. The 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

20、ground. Alternatively, 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 s

21、urface 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 removal devices not classified as anti-static can generate ele

22、ctrical charges 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 replace

23、ment ESD devices 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 ass

24、embly into which 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 cloth

25、es fabric or the lifting of your foot from a carpeted floor can gener- ate 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 UNINSUL

26、ATED “DANGEROUS 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 GENERAL Power supply Refer t

27、o main label Power consumption Refer to main label Weight2.5 kg External dimensions (W x H x D) 360 x 56 x 310 mm Operating conditions Temperature: 5C to 35C, Operation status: Horizontal Operating humidity 5% to 85% CD/DVD Laser Semiconductor laser, wavelength 650 nm Signal system PAL 625/50, NTSC

28、525/60 Frequency response (audio) 140 Hz to 20 kHz Signal-to-noise ratio (audio) More than 75 dB (1 kHz, NOP-3dB, 20 kHz LPF/A-Filter) Dynamic range (audio) More than 80 dB Harmonic distortion (audio) 0.5 % (1 kHz, at 12W position) (20 kHz LPF/A-Filter) Video output 1.0 V (p-p), 75 , negative sync.,

29、 RCA jack TUNER FM Tuning Range 87.5 - 108.0 MHz or 65.0 - 74.0 MHz, 87.5 - 108.0 MHz Intermediate Frequency 10.7 MHz Signal-to Noise Ratio 60 dB (Mono) Frequency Response 140 - 10,000 Hz AM MW Tuning Range 522 - 1,620 kHz or 520 - 1,720 kHz Intermediate Frequency 450 kHz AMPLIFIER Surround modeFron

30、t: 30W + 30W (THD 10 %) Center*: 30W Surround*: 30W + 30W (6 at 1 kHz, THD 10 %) Subwoofer*: 70W (8 at 30 Hz, THD 10 %) Outputs MONITOR MIC Jacks (3.5mm) (KARAOKE MODEL ONLY) SPEAKERS Satellite Speaker (LHS-25SCS) Passive Subwoofer (LHS-25SCW) Type 1 Way 1 Speaker 1 Way 1 Speaker Impedance 6 8 Frequ

31、ency Response 160 - 20,000 Hz 65 - 1,500 Hz Sound Pressure Level 84 dB/W (1m) 82 dB/W (1m) Rated Input Power 30W 70W Max. Input Power 60W 140W Net Dimensions (W x H x D) 92 x 115 x 80 mm 160 x 350 x 280 mm Net Weight 0.5 kg 3.18 kg (* Depending on the sound mode settings and the source, there may be

32、 no sound output.) SPECIFICATIONS 2-1 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPLY CIRCUIT 2-2 2. FRONT CIRCUIT (1/2) PIN3 PIN4 PIN9 : -27.5 FL- : -32.4 VKK : -23.7 FL+ : +5.0 CN902CN902 2-3 3. FRONT CIRCUIT (2/2) 2-42-5 BLOCK DIAGRAM 2-62-7 SCHEMATIC DIAGRAMS 1. POWER SCHEMATIC

33、 DIAGRAM ABCDEFGHIJKLMNOPQRST NOTES) Warning NOTES) Parts that are shaded are critical NOTES) With respect to risk of fire or NOTES) electricial shock. 2-82-9 2. POWER(SUB) SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-102-11 3. MICOM SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-122-13 4. FRONT SCHEMATIC DIA

34、GRAM ABCDEFGHIJKLMNOPQRST 2-142-15 5. DSP& SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-162-17 6. I/O SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-182-19 7. MAIN MIC SCHEMATIC DIAGRAM ABCDEFGHIJKLMNOPQRST 2-202-21 NOTES) Warning NOTES) Parts that are shaded are critical NOTES) With respect to risk of fir

35、e or NOTES) electricial shock. WIRING DIAGRAM 2-222-23 PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN/DVD P.C. BOARD DIAGRAM (TOP) 2-242-25 2. MAIN/DVD P.C. BOARD DIAGRAM (BOTTOM) 2-262-27 3. FRONT P.C. BOARD 2-282-29 4. SMPS P.C. BOARD LOCATION GUIDE NOTES) Warning NOTES) Parts that are shaded are critical

36、 NOTES) With respect to risk of fire or NOTES) electricial shock. 5. JACK P.C. BOARD 3-1 ELECTRICAL TROUBLESHOOTING GUIDE 1. System operation flow Power On No Yes Yes Yes No No No Show LOGO Tray Closed? Tray Close to Closed position SLED Moves to Inner Position Recieve OPEN/ CLOSE Key? Receive CLOSE

37、 Key? 1. Stop Playback & Open Tray 2. Display tray open message & LOGO 1. Execute Pressed Key & IR Key 2. Systemoperati on Routi ne Loop 1. Judge whether have disc and disc type 2. Jump to related disc reading procedure SLED at Inner Side? 1. 8082 initializes SERVO, DSP & RISC registers 2. Write RIS

38、C code to SDRAM 3. Reset RISC SECTION 3. DVD & AMP PART 3-2 2. Test & debug flow TEST Check the POWER PART No Yes No Yes No No Yes Yes Check the POWER PART Check the regulators or diode(D501). 1. Check 27MHz system clock. 2. Check systemreset circuit. 3. Check FLASH R/Wenable signal PRD, RWR. 4. Che

39、ck FLASH Memory related circuit. Check the AC Vol tage Power PCBA (110V or 220V) Switch on the Power PCBA Is the DC Voltage outputs OK?(-34V,-9V,36V,5.6V, 5V,8V,9V,2.5V, 3.3V) Are 3.3V and 5V DC outputs normal on main PCBA? Update FLASH(IC500) successfully? Replace FLASH( IC500) A 3-3 A , 115. 3-4 B

40、 1. 2. 3-5 C ES6698. ES6698. ES6698. 3-6 D 3-7 E Check connection between IC300 ABCK, ALRCK, ASDAT Check the related circuit of PWM.(Check Audio out Pins52, 54, 55, 59,62, 68 Normal PWM IC out?(IC300) PWM IC received correct data stream? Check Digital Amp circuit (IC301, IC302) 3-8 3. AUDIO -COM Cir

41、cuit(DVD & AMP) YES Does CD/DVD appear at FLD? Does AV1, TV Audio, AV1 opt. and FM 87.5 appear at FLD OK Does Loading appear at FLD? POWER ON YESNO YES Does no Disc or Time appear at FLD? NOYES NO NO NO NO NO NO Does it appear DVD Error at FLD? Refer to SMPS. Refer to oscillator Circuit. Check IC101

42、 Reset Waveform. Check 3.3V line. Check Power section Circuit. NO Check power part of Main B/D. Check oscillator of X101. Check if IC101 Pin80 is high. Check if IC101 Pin32, 51, 80 are high(5V). Check if IC101 Pin96 is high. Replace IC101. NO NO Check if DVD an Audio Micom Insert is OK. Check Power.

43、 YES Check DVD Module. YES Check SMPS. YESYES YES YES YES YES YES 3-9 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL 1) ES6698FD main clock is at 27MHz(X501) 3.8V, 27MHz FIG 1-1 2) ES6698FD reset is high active. PWR_CTL(SYSTEM -COM) IC501 PIN83) 5.2VA

44、 Power Cord in M_RESET(IC501 PIN 207) URST(IC501 PIN 188) FIG 1-2 3-10 2. SDRAM CLOCK 1) ES6698FD main clock is at 27MHz(X501) (IC503 PIN 38) DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V FIG 2-1 4) Flash R/W enable signal during download(Downloading) FRD(IC500 PIN 28) FWR(IC500 PIN 11) FIG 1-4 3-11 3. TRAY OPE

45、N/CLOSE SIGNAL 1) Tray open/close waveform OPEN(PDM03 PIN7) CLOSE(PDM03 PIN8) TROPEN(IC402 PIN 4) TRCLOSE(IC402 PIN 5) FIG 3-1 2) Tray close waveform OPEN(PDM03 PIN7) CLOSE(PDM03 PIN8) TROPEN(IC402 PIN 4) TRCLOSE(IC402 PIN 5) FIG 3-2 3-12 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) FMSO(2.0V/

46、1.4V/1.0V) (IC501 PIN 19) STBY(5V) (IC401 PIN 50) SL+(4.7V/3.6V/1.9V) (IC404 PIN 12) SL-(5.3V/3.7V/2.5V) (IC404 PIN 11) FIG 4-1 3) Tray open waveform OPEN(PDM03 PIN7) CLOSE(PDM03 PIN8) TROPEN(IC402 PIN 4) TRCLOSE(IC402 PIN 5) FIG 3-3 3-13 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FOSO(1.5V/1

47、.4V/1.3V) (IC501 PIN 12) F+(4.0V/3.6V/3.2V) (IC404 PIN 14) F-(4.0V/3.6V/3.2V) (IC404 PIN 13) FIG 5-1 6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) MDI1(0V/180mV) (IC401 PIN 26) LD01(5.0V/3.5V) IC401 PIN 20) LD02(5.0V/3.6V) (IC401 PIN 21) FIG 6-1 3-14 F+(IC404 PIN 14) FE(IC401 PIN 40) RFL(

48、IC401 PIN 19) FIG 7-2 (DVD) 7. DISC TYPE JUDGEMENT WAVEFORMS F+(IC404 PIN 14) FE(IC401 PIN 40) RFL(IC401 PIN 19) FIG 7-1 (DVD) 3-15 F+(IC404 PIN 14) FE(IC401 PIN 40) RFL(IC401 PIN 19) FIG 7-3 (CD) F+(IC404 PIN 14) FE(IC401 PIN 40) RFL(IC401 PIN 19) FIG 7-4 (CD) 3-16 FE(IC401 PIN 40) FOSO(IC501 PIN12

49、) F+(IC404 PIN 14) F-(IC404 PIN 13) FIG 8-2 (CD) 8. FOCUS ON WAVEFORMS FE(IC401 PIN 40) FOSO(IC501 PIN12) F+(IC404 PIN 14) F-(IC404 PIN 13) FIG 8-1 (DVD) 3-17 9. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) DMSO(1.4V/1.8V) (IC501 PIN 18) SP-(3.6V/2.4V) (IC404 PIN 18) SP+(3.6V/4.8V) (IC404 PIN 17) FIG 9-1 10. TRACKING CONTROL RELATED SIGNAL(System checking) TE(IC401 PIN 39) TRSO(IC501 PIN 13) T-(IC404 PIN 16) T+(IC404 PIN 15) FIG 10-1(DVD) 3-18 11. RF WAVEFORM RFOP(2.3V/1.1V) (IC401 PIN