NAD-L70-avr-sm 电路图 维修手册.pdf

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1、NAD SERVICE MANUALL 70 L 70 AV SURROUND SOUND DVD RECEIVER AV SURROUND SOUND DVD RECEIVER DRAFT DATE: 23 July 2004RadioFans.CN 收音机爱 好者资料库 FRONT PANEL Identification of controls 1 2 3 4 5 6 7 8 9 10 11 12 13141516171819 ATTENTION! Please make all connections to your L70 receiver with the unit unplugg

2、ed. (It is also advisable to power-down or unplug all associated components while making or breaking any signal or AC power connections.) ANTENNA CAB/SAT INPUT VCR IN MONITOR AUDIO S-VIDEO FMGNDAM OUTOUTOUTOUT DIGITDIGITALAL OUTPUT OUTPUT COMPONENTCOMPONENT VIDEO OUTVIDEO OUT Cr Cb Y Cr Cb Y VIDEO L

3、 R RLRLCENTERFRONTSURROUND 5.1 CHANNEL INPUT CENTERSURROUND OSD SELECT FRONT SUBW VIDEOS-VIDEO SPEAKERS AC OUTLET SWITCHED DIGITAL AUDIO INPUT COAXIALOPTICALOPTICAL OUTPUTOUTPUT SUB WOOFER PRE-OUT12 V TRIGGER OUTINPUT SCARSCART/RGB OUTT/RGB OUT 240 VOLT EUROPEAN VERSION ONLY 240 VOLT EUROPEAN VERSIO

4、N ONLY 120 VOLT NORTH AMERICAN VERSION ONLY 120 VOLT NORTH AMERICAN VERSION ONLY POWER NAD 2002 L70 AC OUTLET SWITCHED 100WATTS MAX 128 121164151413 753109 REAR PANEL Identification of controls RadioFans.CN 收音机爱 好者资料库 1-3 SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES. 1-4 SERVICING

5、PRECAUTIONS . 1-5 * General Servicing Precautions * Insulation checking prodedure * Electrostatically Sensitive Devices SPECIFICATIONS . 1-6 DISASSEMBLY . 1-7 PRINCIPAL PART LOCATION. 1-8 RESET PROCEDURES . 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

6、CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURERS 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 PE

7、RFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM AC LINE SHOCK. SAFETY CHECKS AFTER THE O

8、RIGINAL 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 AC TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASUR

9、E 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 PART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A

10、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 RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2. AVOID CONDITIONS O

11、F 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 DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VE

12、NTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCAL MOUNTING KIT MUST FOLLOW THE FACTORY APPROVED 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, BOL

13、TS 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 PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STAB

14、LE 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 CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MOD

15、EL 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, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY. THE LIGHTNING FL

16、ASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE PRESENCE OF UNINSULATED “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 I

17、S INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE. 1-5 SERVICING PRECAUTIONS CAUTION : Before servicing the A/V Receiver covered by this service data and its supplements and addends, read and foll

18、ow 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 Servicing Precautions 1. Always unplug the A/V Receive

19、r 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 test substitute in parallel with an electrolytic

20、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 A/V Receiver or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contac

21、ts 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 any plug/socket B+ voltage interlocks with which i

22、nstruments 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 assemblies unless all solid-state device heat sinks are correctly installed. 6. Always connect test instrument ground lead to the appropriate ground before connecti

23、ng 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 the attachment plug. The insulation resistanc

24、e 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 Some semiconductor (solid state) devices can be

25、 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 techniques should be used to help reduce the

26、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, obtain and wear a commercially available dischar

27、ging 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 foil, to prevent electrostatic charge buildup or

28、 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 to damage ES devices. 5. Do not use freonprope

29、lled 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 with leads electrically shorted together by condu

30、ctive 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 be installed. Caution : Be sure no power is app

31、lied 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 foot from a carpeted floor can generate static el

32、ectricity sufficient to damage an ES device.) 9. Resetting the L70 is by pressing three front panel keys; PLAY, then STOP, then separately hold the AM/FM key for more than 5 sec. The L70 will switch off. 1-6 SPECIFICATIONS Amplifier Section Output Power (Front) : F.T.C Rating: 60 watts RMS per chann

33、el 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) : 50 + 50 Watt (Front) 50 Watt (Center) 50 + 50 Watt (Rear) Total Harmonic Distortion (Front) : 0.05 % (at 30 watts, 1 kHz) Delay Time :

34、DOLBY DIGITAL : REAR : 0 - 15 ms CENTER : 0 - 5 ms DOLBY PRO LOGIC : REAR : 15 - 30 ms Audio Input Sensitivity/Impedance : *LINE : 320 mV/47 k ohms Output Level / Impedance : VCR REC : 300 mV/2.2 k ohms Frequency Response : *LINE : 10 Hz - 60 kHz, +1/ -3 dB Signal-to-Noise Ratio : 1 Watt *LINE : 70

35、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, 96 kHz DIGITAL Input Level/Impedance COAXIAL : 0.5 Vp-p/75 ohms OPTICAL : -15 dBm -21 dBm Video Section Input Sensitivity /Impedance : 1.0 Vp-p/75 ohms Outpu

36、t Level /Impedance : 1.0 Vp-p/75 ohms *LINE means CABLE/SAT, VCR, VIDEO4 Improvements may result in specifications and features changing without notice. lllustrations may differ slightly from production models. FM Tuner Section (Without notes 100.1 MHz, 65 dBf) Tuning Range : 87.5 MHz - 108.0 MHz C:

37、 50 kHz steps AH: 100 kHz steps AM Suppression Ratio: C: 50 dB AH: 60 dB Total Harmonic Distortion (1 kHz) : Mono : 0.4% Stereo : 0.5% Frequency Respones : 20 Hz - 15 kHz, +1/ -1. 5 dB Stereo Separation (1 kHz) : C: 40 dB AH: 35 dB Signal-to-Noise Ratio : Mono : 70 dB Stereo : 65 dB AM Tuner Section

38、 Tuning Range: C : 522 kHz - 1,620 kHz (9 kHz steps) AH : 520 kHz - 1,710 kHz (10 kHz steps) Usable Sensitivity : 55 dB/m Total Harmonic Distortion : 0.1% at 85 dB/m Signal-to-Noise Ratio : 40 dB at 85 dB/m General Power Requirements : C : 230V AC, 50Hz AH : 120V AC, 60Hz Power Consumption : C: 1.3A

39、 AH: 2.5A AC Outlets : unswitched x 1, Total 100 W max. (1A) Dimensions (W x H x D) : 435 x 133 x 375 Weight (net) : 16.3 kg 1-7 DISASSEMBLY 1 REMOVAL OF TOP COVER 2 REMOVAL OF FRONT PANEL 1-8 PRINCIPAL PARTS LOCATION L70 RESET PROCEDURE FOR Receiver Functions Only (place L70 in FM mode): Press Play

40、 then Stop then the FM/AM key, holding in the FM/AM key for more than 5 seconds. RESET PROCEDURE FOR DVD-Player Functions Only (DVD OSD mode): Select DEFAULTS to restore factory defaults. The factory default password is 2580. 1-91-10a EXPLODED VIEW AH & C 20SCREWS19CTB3+6F 1 1 CUP11554-2 CIP11445BSM

41、D HJDRL-A700HD3 CUP11554-1 CUP11553-1 CUP11555 CUP11556-1 HDMKD1206PTS3 CLT5V031ZU(ZE) CUP11553-2 CUP11553-5 CUP11553-4 S17 S18 1 3 SCREW SCREW S11 S10CTB3+16J CTB3+20J 4SCREW S16 KHD1A016 15 15 5 26 2MOUNT, PCBCMH1A119 13 4 6 2SCREWCTW3+12J S15 S13 S14 SCREW CTB3+6J 6SCREW S3 CTB3+8JFC S12 SCREWCTS

42、3+8J SCREWCTW3+20J CKC1A135S35 DVD DSP (23 pin connector)1 31 4 15 2 SCREW SCREW SCREW SCREW SCREW SCREW SCREW SCREW, TR SCREW, FAN SCREW, TRANS4 DESCRIPTIONQTY S7 S6 S9 S8 S1 S4 S2 S5 NO. CTB3+8J PARTS NO. CTW3+16J CTW3+8J CTB4+6FFC CTB3+8GFZ CTB3+10G CTB3+8JFZ KHD1A023 KHD1A012 KHD1A036 1 1 1 33 3

43、4 32 35 CPU BOARD (receiver CPU) MAIN PCB ASSY (DVD) VIDEO PCB ASSY 1 1 2 1 1 2 3 4 2 2 MECHANISM ASSY POWER PCB ASSY FAN CUSHION, FOOT HOLDER, PCB HOLDER, PCB BRACKET, HEATSINK HEATSINK AMP PCB ASSY SUPPORT, MECHA 29 30 26 27 28 CHG1A171 24 25 21 22 23 KHE170 KHE1A030 CMD1A479 CMY1A197 CMH1A189 1 4

44、 1 1 1 1 1 1 0.17 1 CHASSIS, BOTTOM KNOB, POWER PHONE JACK PCB ASSY FRONT PCB ASSY PANEL, SUB POWER TRANS FOOT VIDEO JACK PCB ASSY CABINET, TOP INDICATOR, POWER 5 1 1 2 1 1 1 1 1 PANEL, AL KNOB, ENTER WINDOW, FIP COVER, JACK ORNAMENT, DOOR BAR, SIDE KNOB, DISPLAY VOLUME KNOB ASSY ROTARY KNOB ASSY WI

45、NDOW, SENSOR1 19 20 16 17 18 CGL1A188 13 14 15 11 12 8 9 6 7 3 4 1 2 5 10 CGR1A288M7K102 CGU1A244A8 KKM2A062C37 CBT1A745M7K102 CBT1A853M7K102 CGU1A245A10 CBT1A746M7K102 CGW1A351M7K102 CUA1A223 CGR1A287M7ZK102 KGK1A063YA KGK1A081ZA KKM1A130ZC37 CKL1A060 NO.PARTS NO.DESCRIPTIONQTY 41 41 S17 S6 S9 S12

46、X2 S5 X8S6 S13 X3S6 39 22 24 (CNVKSTMB014MA18) (KKM1A130YC37) S5 CUP11556-2 CUP11556-3 CNVMB001MA09DS CMX1A140 CMX1A139 1BARRIER 1 1SUB TRANS ASSY 1INSULATOR 1FAN, BRACKET, 2x resistors 45 44 46 42 COP11555 L70 PCB AMP ASSEMBLY 43 41HDMKD1245PFS2 KHR1A028 1 1 2 1 1CKF1A244Z 38 39 37 36 40 TUNER PACK PANEL, REAR PCB ASSY BUSHING, AC CORD X2 29 S10 S11 S10 S15 X2 X4 S10 X6S15 X9 37 S6X3 S6X2 X4S1 X2S1 X4 38 S5 S128 26 27 S14 25 26 28 29 (CKF2A244Y) 38 X2S9 36 35 S2X3 34 42 40 COP11554B(AH) & COP11554C CUP11554-1 & CUP11554-2 S9 45 44 43 S9X2 X5 S2 S18 S2 S9X4 S1 S1 S7 S3X4 X2S8 X4S1 X