Nad-L-55-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL L55 DVD/VIDEO CD/CD PLAYER DVD/VIDEO CD/CD PLAYER L55 RadioFans.CN 收音机爱 好者资料库 1-2 RadioFans.CN 收音机爱 好者资料库 1-3 PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURERS

2、 APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO O

3、THERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK. SAFETY CHECKS AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A CHECK SHOULD BE MADE OF THE FOLLOWING. SUBJECT : FIRE CONNECT A 1500 OHM

4、 10 WATT RESISTOR, PARALLELED BY A .15 MFD, 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPE

5、AT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT : GRAPHIC SYMBOLS SUBJECT : TIPS ON PROPER

6、INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM

7、LEAKAGE IS A FACTOR, ETC. 3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCAL MOUNTING KIT MUST FOLLOW THE FACTORY APP

8、ROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTAL

9、LATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTE

10、RS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.S OF THE SAME OR LARGER SCREEN SIZE. 8. CA

11、UTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY. THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE PRESENCE OF U

12、NINSULATED “DANGEROUS VOLTAGE” WITHIN THE PRODUCTS ENCLOSURE 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 USER TO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS

13、IN THE LITERATURE ACCOMPANYING THE APPLIANCE. A.C. VOLTMETER PLACE THIS PROBE ON EACH EXPOSED METAL PART GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC 10 WATT 1500 OHM 0.15uF RadioFans.CN 收音机爱 好者资料库 1-4 SERVICING PRECAUTIONS CAUTION : Before servicing the DVD player covered by this service

14、data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publication, always follow the safety precautions. Remember Safety First: General Ser

15、vicing Precautions 1. Always unplug the DVD players AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any internal electrical plug or other electrical connection. (3) Connecting a

16、 test substitute in parallel with an electrolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this DVD player or any of its assemblies. 3. Unless specified otherwi

17、se in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cottontipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required. 4. Do not defeat an

18、y plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped. 5. Do not apply AC power to this DVD player and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. 6. Always connect test instrument ground

19、lead to the appropriate ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of

20、 the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1M-ohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices S

21、ome semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical Es devices are integrated circuits and some field effect transistors and semiconductor chip components. The following

22、 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, ob

23、tain 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 ES devices, place the assembly on a conductive surface such as aluminum fo

24、il, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an antistatic solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient

25、to damage ES devices. 5. Do not use freonpropelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged wit

26、h leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material). 7. lmmediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will b

27、e 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 ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foo

28、t from a carpeted floor can generate static electricity sufficient to damage an ES device.) 1-5 DVD player/Outputs/Supplied Accessories DVD player Outputs Supplied Accessories Power supplyAC 230V / 50 Hz (EUROPE), AC 110V/60Hz (USA / CANADA) Power consumption15 W Mass 3.3 kg External dimensions (W X

29、 H X D)285 x 103x 291 mm Signal systemPAL (EUR) , NTSC (USA / CANADA) LaserSemiconductor laser, wavelength 650 nm Frequency range (audio)4 Hz to 20 kHz Signal-to-noise ratio (audio)More than 100 dB (EIAJ) Dynamic range (audio)More than 95 dB (EIAJ) Harmonic distortion (audio) 0.008 % Wow and flutter

30、Below measurable level (less than + 0.001 % (W.PEAK) (EIAJ) Operating conditionsTemperature: 41F to 95F, Operation status: Horizontal Video output1.0 V (p-p), 75, negative sync., RCA jack x 1 S-video output(Y) 1.0 V (p-p), 75, negative sync., Mini DIN 4-pin x 1 (C) 0.286 V (p-p), 75, SCART video out

31、putCVBS 1.0 V (p-p), 75, negative sync., RCA jack x 1 (RGB) 0.63 V (p-p), 75 Audio output (digital audio)0.5 V (p-p), 75, RCA jack x 1 Audio output (optical audio)Optical connector x 1 Audio output (analog audio)2.0 Vrms(1 KHz, 0 dB), 330, RCA jack (L, R) x 1 Video cable. . . . . . . . . . . . . . .

32、 . . . . . . . . . . . . . . . . 1 Audio cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 * Designs and specifications are subject to change without notice. 1-6 Front Panel Display Window POWER indicator (Standby mode: Blue color) POWER button REMOTE SENSOR DISPLAY WINDOW OPEN/CL

33、OSE button SKIP/SCAN buttons Disc tray PLAY button PAUSE/STEP button STOP button OPERATING STATUS indicator CD indicator VCD indicator DVD indicator PROGRAM indicator Repeat playback mode indicators CHP/TRK NUMBER indicator TOTAL PLAYING TIME/ELAPSED TIME indicator TITLE NUMBER indicator ANGLE ICON

34、indicator 1-7 Rear Panel COMPOSITE VIDEO OUT jack COMPOSITE VIDEO OUT jack COMPONENT VIDEO OUT jack MIXED AUDIO OUT jacks MIXED AUDIO OUT jacks EURO AV-TV-VCR OUT jack OPTICAL DIGITAL AUDIO OUT jack DIGITAL AUDIO OUT jacks (COAXIAL) DIGITAL AUDIO OUT jacks (COAXIAL) POWER CORD Connect to an AC 230V,

35、 50Hz outlet only. POWER CORD Connect to an AC 110V, 60Hz outlet only. S-VIDEO OUT jack S-VIDEO OUT jack *EUR VERSION *USA/CANADA VERSION OPTICAL DIGITAL AUDIO OUT jack REMOTE CONTROL *REMOTE SELECT 1-8 BJA2B043Z KOP11408B KOP11401CSMPS 10 1KGX1A304SHEET KUP11408C x11 S1 x4 S3 x4 S10 x3 x5 x2S6 S7 1

36、9 12 x4 S6 x4 13 x4 x2 S5 S5 x4 20 x2 S4 14 S9 S10 25 26 X2 18 17 X2 23 16 24 S6 X2 S5 S6 S7 22 21 11 S11 27 15 S4 x2 S2 4 28 x2 9 8 6 S2 7 5 3 2 4 1 1 1 BKL1A060 BHG1A171FOOT CUSHION FOOT 1 KKF1A210ZREAR PANEL KUP11390ZAV PCB ASSY 1POWER PCB ASSY 1 KMD1A420 PCB BRACKET 1 BVNTFCEIE311A MAIN PCB ASSY

37、 1KHR1A028AC CORD BUSHING 1AC CORD KBT1A745M7K102 KBT1A746M7K102 KGU1A245A10 KGL1A188 KKM1A051C26 KGU1A244A8 2KTB4+6JFZS11SCREW 9KTB3+6JFZS10SCREW KHE170PCB HOLDER 2DISPLAY KNOB 1POWER KNOB 1SENSOR WINDOW 1 QTY 1 2 1 0.17 KKM1A106ZC26 KGR1A214M7ZK102 PARTS-NO SIDE BAR NO 1 4 3 x2 6 5 S6 2 8 7 11 10

38、9 13 12 14 15 DESCRIPTION FRONT PANEL DOOR ORNAMENT FIP WINDOW LED INDICATOR 4 4 1 1 2 1 1 1 1 KUA1A189 BJDTVM502/1 KGW1A298 KKC3B076S33 KHG1A104 KMD1A413 1 FRONT PCB ASSY 18 17 19 20 22 25 24 23 21 27 26 29 28 QTY 4 4 4 6 9 KTB3+10G KHD1A016 KTB3+6J KTS3+8J KTB3+6F PARTS-NO 3 2 2 KTW3+12J KTB3+8J K

39、TB3+10GFZ KTW3+8J12 PCB BRACKET SUB PANEL TOP CABINET CUSHION BOTTOM CHASSIS MECHANISM,DVD JACK,BOARD 16 1 MECHA. SUPPORTKMH1A113 X2 SCREW SCREW,SPECIAL SCREW SCREW SCREW NO S3 S2 S5 S4 S1 SCREW SCREW SCREW S7 S9 S8 S6SCREW DESCRIPTION EXPLODED VIEW 1-91-10 2-1 SECTION 2 ELECTRICAL CONTENTS ELECTRIC

40、AL TROUBLESHOOTING GUIDE.2-2 1. Power (SMPS) Circuit .2-2 .2-3 3. MPEG Circuit.2-6 4. Front Circuit (Digitron & Key) .2-7 5. RF/Servo Circuit .2-8 BLOCK DIAGRAMS.2-12 1. Overall Block Diagram.2-12 2. Power (SMPS) Block Diagram.2-13 3. RF/CD DSP/DVD DSP/DVD servo Block Diagram .2-14 4. Audio Block Di

41、agram.2-15 5. MPEG Block Diagram.2-16 .2-17 CIRCUIT DIAGRAMS.2-18 1. Power (SMPS) Circuit Diagram .2-18 2. DVD DSP Circuit Diagram.2-20 3. Drive & RF Circuit Diagram .2-22 4. MPEG Circuit Diagram .2-24 4-1. WAVEFORMS.2-26 5. Audio DM & 5.1CH Circuit Diagram.2-28 .2-30 7. DIGITRON & Key Circuit Diagram.2-32 8. Jack Circuit Diagram.2-34 PRINTED CIRCUIT DIAGRAMS.2-36 1. MAIN P.C.BOARD.2-36 2. POWER P.C.BOARD.