Nad-L-76-Service-Manual(1) 电路图 维修手册.pdf

《Nad-L-76-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-76-Service-Manual(1) 电路图 维修手册.pdf（45页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL L76 A/V RECEIVER L76 A/V RECEIVER RadioFans.CN 收音机爱 好者资料库 1- 3 SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES. 1- 4 SERVICING PRECAUTIONS . 1- 5 * General Servicing Precautions * Insulation checking prodedure * Electrostatically Sensitive Devices SPECIFICATIONS . 1- 6

2、LOCATION OF CUSTOMER CONTROLS . 1- 7 1- 8 EXPLODED VIEW . 1- 9 1- 10 RadioFans.CN 收音机爱 好者资料库 1- 4 PRODUCT SAFETY SERVICING GUIDELINES CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURERS APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT

3、 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 OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZA

4、RDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM AC 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 10 WATT RESISTOR, PARALLELED BY A .15 MFD, 150V

5、 AC TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE AC VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC P

6、ART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT : GRAPHIC SYMBOLS SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED- IN

7、 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 LEAKAGE IS A FACTOR, ETC. 3. AVOID PLACEMENT WHERE DRAPE

8、RIES 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 APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF

9、 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 INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A

10、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 CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION C

11、USTOMERS 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. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXP

12、LAIN 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 UNINSULATED “DANGEROUS VOLTAGE” WITHIN THE PRODUCTS ENCL

13、OSURE 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 IN THE LITERATURE ACCOMPANYING THE APPLIANCE. RadioFans

14、.CN 收音机爱 好者资料库 1- 5 SERVICING PRECAUTIONS CAUTION : Before servicing the A/V Receiver covered by this service 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 sa

15、fety precautions in this publication, always follow the safety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the A/V Receiver AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly.

16、(2) Disconnecting or reconnecting any internal electrical plug or other electrical connection. (3) Connecting a 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 haz

17、ard. 2. Do not spray chemicals on or near this A/V Receiver or any of its assemblies. 3. Unless specified otherwise 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 applicat

18、or. Unless specified otherwise in this service data, lubrication of contacts is not required. 4. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped. 5. Do not apply AC power to this A/V Receiver and/or any of its electrical ass

19、emblies unless all solid- state device heat sinks are correctly installed. 6. Always connect test instrument ground 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 att

20、achment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of 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 Cond

21、uctive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical

22、Es devices are integrated circuits and some field effect transistors and semiconductor chip 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-

23、equipped assembly, drain off any electrostatic charge on your body by touching a known earth 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 re

24、moving an electrical assembly equipped with ES devices, place the assembly on a conductive surface 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 ES devices. 4. Use only an antistatic solder

25、 removal device. Some solder removal devices not classified a “anti- static” can generate electrical charges sufficient 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 it

26、s protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material). 7. lmmediately before removing the protective material from the leads o

27、f a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be 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 replaceme

28、nt ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.) 1- 6 SPECIFICATIONS Amplifier Section Output Power (Front) : F.T.C Rating: 60 watts RMS

29、per channel minimum, both channels driven into 8 ohms from 20 Hz to 20kHz with no more than 0.09% total harmonic distortion Surround Output Power (0.5% THD, 1 kHz, 8 ohms) : 40 + 40 Watt (Front) 40 Watt (Center) 40 + 40 Watt (Rear) Total Harmonic Distortion (Front) : 0.02 % (at 60 watts, 1 kHz) Dela

30、y Time : DOLBY DIGITAL : REAR : 0 - 15 ms CENTER : 0 - 5 ms DOLBY PRO LOGIC : MOVIE : 10 - 25 ms MUSIC : 0 - 15 ms EMULATION : 10 - 25 ms Audio Input Sensitivity/Impedance : *LINE : 200 mV/47 k ohms Output Level / Impedance : TAPE REC : 185 mV/2.2 k ohms Frequency Response : *LINE : 20 Hz - 65 kHz,

31、+1/ - 3 dB Signal- to- Noise Ratio : 1 Watt *LINE : 70 dB (IHF- A) Tone Control : BASS : 10 dB at 100 Hz TREBLE : 10 dB at 10 kHz Digital Audio Section Sampling Frequency : 32 kHz, 44.1 kHz, 48 kHz DIGITAL Input Level/Impedance COAXIAL : 0.5 Vp- p/75 ohms OPTICAL : - 15 dBm - 21 dBm Video Section In

32、put Sensitivity /Impedance : 1.0 Vp- p/75 ohms Output Level /Impedance : 1.0 Vp- p/75 ohms *LINE means TAPE, AUX, VIDEO 1, VIDEO 2, DVD Improvements may result in specifications and features changing without notice. lllustrations may differ slightly from production models. FM Tuner Section (Without

33、notes 100.1 MHz, 65 dBf) Tuning Range : 87.5 MHz - 108.0 MHz : 50 kHz steps AM Suppression Ratio: 45 dB Total Harmonic Distortion (1 kHz) : Mono : 0.4% Stereo : 0.5% Frequency Respones : 30 Hz - 15 kHz, +1/ - 1. 5 dB Stereo Separation (1 kHz) : 40 dB Signal- to- Noise Ratio : Mono : 75 dB Stereo : 7

34、0 dB AM Tuner Section Tuning Range: 522 kHz - 1,620 kHz (9 kHz steps) Usable Sensitivity : 55 dB/m Total Harmonic Distortion : 0.8% at 85 dB/m Signal- to- Noise Ratio : 45 dB at 85 dB/m General Power Requirements : 230V AC, 50Hz Power Consumption : 1.2A Dimensions (W x H x D) : 285 x 133 x 348 Weigh

35、t (net) : 8.8kg 1- 7 LOCATION OF CUSTOMER CONTROLS POWER STANDBY/ON button VFL Display PHONES BASS/TREBLE Tone Controls MASTER VOLUME Control BALANCE Control SOURCE SELECTOR Control AUDIO Signal jacks VIDEO Signal jacks PRE OUT jack DIGITAL OUT jacks SPEAKER terminals Dolby Digital / DTS / PCM DIGIT

36、AL IN jacks S-VIDEO Signal jacks FRONT PANEL REAR PANEL 1- 8 SURROUND MODE indicator TUNED indicator RDS indicator MEMORY indicator TUNER MUTE indicator INPUT SOURCE, FREQUENCY, LEVEL indicator DELAY TIME, PRESET CHANNEL indicator DEVICE SELECTOR CHANNEL VOLUME LEARN RANDOM AMFM HTR L76 /ZOOMTV/VIDE

37、O 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.CENTER SUB ENTER ON OFF PRESET? ? SLOW? ? CAB/SAT VFL DISPLAY REMOTE CONTROL 1. POWER ON/OFF button (L76/L56) 2. DEVICE SELE

38、CTOR 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. MUTE button (L76) 9. PRESET UP/DOWN buttons (L76), SLOW buttons (L56) 10. TEST TONE button (L76)

39、, 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 (L76/L56) 16. ENTER button (L76/L56) 17. DIGITAL INPUT/ RDS button (L76), DVD DISPLAY button (L56)

40、 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) 25. SURROUND LEVEL UP/DOWN buttons (L76) 26. CENTER LEVEL UP/DOWN buttons (L76) 27. SUBWOOFER LEV

41、EL UP/DOWN buttons (L76) 1-91-10 EXPLODED VIEW C:CKF1A212WK1 C:CJA2B043Z C:19 C:14 C:CLT5V026YE KKM1A105XC37 C:HNVTFCE1E319A LOCKERC:KRE1A03710 X1027 C C C:CLT5L052ZE RUBBER , TRANSKHG1A1982 23 24 67X21 32 66 X10 51 1 2 52 x4 x4 x2 54 X7 53 x2 4 10 8 9 44 55 5 x3 6 7 8 11 12 28 62 36 14 48 15 16 25

42、35 43 45 65 37 39 66 34 30 31 41 47 29 18 19 63x4 x4 17 x4 x3 60X2 53 x6 21 22 42 38 46 13 57 60 x4 x2 x2 40 58 x6 x9 59 26x6 58x6 26 59x6 x6 63 X4 X4 53X2 60X2 X2 64 X2 56 X4 61 X10 64 3X2 N0 1 2 3 4 5 DESCRIPION 8 10 9 7 6 13 20 19 18 15 17 16 14 12 11 23 25 24 22 21 AC CORD BUSHING FOOT CUSHION F

43、OOT TOP CABINET KHR1A028 CKL1A060 4 4 CKC1B082S351 28 27 1 30 29 1 32 31 34 33 26 40 42 41 35 38 39 37 36 43 45 44 PARTS-NOQ,ty 47 48 CHG1A171 46 1 1 PCB MOUNTCHE1A0236 CUA1A190CHASSIS , BOTTOM PANEL , REAR 1 1 1 1 1 SIDE BAR AL PANEL VOLUME KNOB ASSY VOLUME KNOB ASSY(B) VOLUME KNOB ASSY(A) INDICATO

44、R,POWER WINDOW,FIP SINK, HEAT(F) KKM2A062C37 KGK1A063YA KGK2A064WA KGK1A064XA CGU1A244A8 CMY1A1151 1 1 1 1.2 1 3 1 2 1 COVER, FANCMH1A117 PCB , AUDIO INPUT KNOB, POWER PANEL, SUB FAN KNOB, DISPLAY WINDOW, SENSOR CDD1A013 CGW1A299 1 1 CGU1A245A10 CBT1A756M7K102 CBT1A745M7K102 1 3 1 CGL1A188 CHE170 SI

45、NK, HEAT(R)CMY1A116 HOLDER, PCB1 AC CORD 4SCREWCTW3+14J61 65 63 64 62 SCREW SCREW SCREW CTB4+6J CTW3+8J CTW3+16J 5 4 2 53 57 59 60 58 55 56 54 51 52 CTB3+6JSCREW SCREW SCREW SCREW SCREW SCREW SCREW CSN2+4 CTB3+16J CTB3+8J CHD1A012 CTWS3+10G CTB3+10G CTB3+6F SCREW SPECIAL SCREW CTS3+8J CHD1A016 7 2 1

46、2 8 15 10 1 7 4 4 CMH1A119SUPPORT, H/S12 1CUP11551-2/3 PCB , VIDEO INPUT PCB , SVIDEO INPUT PCB , GUIDE PCB , SURROUNDCUP11550-1/2 PCB , FRONT AMPCUP11397-1 PCB , SURROUND AMPCUP11397-2 PCB , SPEAKERCUP11431-1 PCB , SUB TRANSCUP11431-3 PCB , AC OUTLETCUP11431-2 PCB , MAINCUP11395-1 PCB , TRANSCUP113

47、95-2 PCB , PSUCUP11395-3 PCB , CONNRCTORCUP11431-4 MOTOR TUNER,MODULE TRANS , SUB TRANS , MAIN BDMMDN4RB4MRC SCREW SCREW SCREW67 66 CTB3+10GFZ CTB3+6JFZ CTB4+6FFZ4 SPECIAL SCREW 1 1 1 1 1 1 1 1 1 1 1 1 1 PCB , HEADPHONECUP11551-7 CUP11551-1PCB , U-COM1 CUP11551-4 CUP11551-5 CUP11551-6 1 2-222-23 1.

48、BLOCK DIAGRAM 2-242-25 BLOCK DIAGRAM 2-262-27 2. WIRING DIAGRAM 2-282-29 3. SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAMS 2-302-31 u-COM & GUIDE CIRCUIT DIAGRAM 2-322-33 INPUT SCHEMATIC DIAGRAM AMP, SPEAKER, SUB TRANS & AC OUTLET CIRCUIT DIAGRAM 2-342-35 2-362-37 SURROUND CIRCUIT DIAGRAM 2-382-39 SURROUND C