Nad-L-56-Service-Manual(1) 电路图 维修手册.pdf

《Nad-L-56-Service-Manual(1) 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Nad-L-56-Service-Manual(1) 电路图 维修手册.pdf（44页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL L56 DVD/VIDEO CD/CD PLAYER DVD/VIDEO CD/CD PLAYER L56 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 DVD / CD / MP3 Player L 56 REMOTE CONTROL 1-8 DEVICE SELECTOR CHANNEL VOLUME LEARN RANDOM AMFM HTR L76 /ZOOMTV/VIDEO AUX VIDEO 1VIDEO 2DVD PROGRAMCLEARREPEAT TUNER SETUP SLEEP TAPE TVAMP VCR CDDVD TUNER TAPEMACRO 231 546 879 0 10+MUTE TEST VOL SURR.? MODE CH SLOW? ? MENU RTNDISP TITLE SURR

35、.CENTER SUB ENTER ON OFF PRESET? ? SLOW? ? CAB/SAT 1. POWER ON/OFF button (L76/L56) 2. DEVICE SELECTOR buttons 3. PROGRAM buttons (L56) 4. CLEAR button (L56) 5. REPEAT button (L56) 6. INPUT SOURCE SELECTOR buttons(L76), NUMERIC buttons (L76/L56) 7. OSD ON/OFF buttons (L76), DVD SET UP button (L56) 8

36、. MUTE button (L76) 9. PRESET UP/DOWN buttons (L76), SLOW buttons (L56) 10. TEST TONE button (L76), ZOOM button (L56) 11. SURROUND MODE button (L76), RANDOM button (L56) 12. VOLUME UP/DOWN buttons (L76) 13. AM button (L76), TITLE button (L56) 14. FM button (L76), MENU button (L56) 15. ARROW buttons

37、(L76/L56) 16. ENTER button (L76/L56) 17. DIGITAL INPUT/ RDS button (L76), DVD DISPLAY button (L56) 18. SLEEP button (L76), RETURN button (L56) 19. OPEN/CLOSE button (L56) 20. STOP button (L56) 21. PAUSE button (L56) 22. REV SCAN/SKIP button (L56) 23. PLAY button (L56) 24. FOR SCAN/ SKIP button (L56)

38、 25. SURROUND LEVEL UP/DOWN buttons (L76) 26. CENTER LEVEL UP/DOWN buttons (L76) 27. SUBWOOFER LEVEL UP/DOWN buttons (L76) DESCRIPTION SCREWS6 S8 S9 S7 SCREW SCREW SCREW S1 S4 S5 S2 S3 NO SCREW SCREW SCREW SCREW,SPECIAL SCREW X2 CMH1A191MECHA. SUPPORT 1 16 MECHANISM,DVD BOTTOM CHASSIS TOP CABINET SU

39、B PANEL 8CTW3+8J CTB3+10GFZ CTB3+8J CTW3+12J 3 2 3 PARTS-NO CTB3+6F CTS3+8J CTB3+6J CHD1A016 CTB3+10G 9 6 4 4 4 QTY 21 23 22 20 19 17 18 FRONT PCB ASSY 1 CKC1B127S35 CGW2A298 HJDRL-A70060R5 CUA1A224 1 1 1 1 1 1 4 4 LED INDICATOR FIP WINDOW DOOR ORNAMENT FRONT PANEL DESCRIPTION 15 14 12 13 9 10 11 7

40、8 2 5 6 3 4 1 NO SIDE BAR PARTS-NO CGR1A287M7ZK102 KKM1A106WC37 0.17 1 2 1 QTY 1 SENSOR WINDOW1 POWER KNOB1 DISPLAY KNOB2 PCB HOLDERCHE170 EXPLODED VIEW(L56C) SCREWS10CTB3+6JFZ9 SCREWS11CTB4+6JFZ2 CGU1A244A8 KKM1A051C37 CGL1A188 CGU1A245A10 CBT1A746M7K102 CBT1A745M7K102 AC CORD AC CORD BUSHINGKHR1A0

41、28 1 1 POWER PCB ASSY1 AV PCB ASSYCOP11458I REAR PANELCKF4A229UK1 1 FOOT FOOT CUSHIONCHG1A171 CKL1A060 1 1 1 4 2 3 5 7 S2 6 8 9 x2 11 4 S2 x2 S4 17 24 S11 S6X4 S6 18 20 22 23 S10 S9 15 x4 14 x4 S6 x4 13 x4 S10 x4 S3 x4 S1 x11 C0P11559B SHEETKGX1A304 10 COP11489CSMPS CJA2B043Z 12 19 X3 21 x3 S7 S7 X2

42、 24 DVD PCB ASSY 16 CIP11445HSMD 2-1 SECTION 2 ELECTRICAL CONTENTS ELECTRICAL 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 Diagra

43、m.2-13 3. RF/CD DSP/DVD DSP/DVD servo Block Diagram .2-14 4. Audio Block Diagram.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 .