Nad-L-75-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL L75 A/V RECEIVER NAD ELECTRONICS INTERNATIONAL TORONTO NAD 2001 RadioFans.CN 收音机爱 好者资料库 SERVICE MANUAL L75 A/V RECEIVER L75 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 Prec

2、autions * Insulation checking prodedure * Electrostatically Sensitive Devices SPECIFICATIONS . 1-6 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 PERFOR

3、M 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 PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING

4、 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 ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A CHECK SHOULD BE MADE OF TH

5、E 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. MEASURE THE AC VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD

6、 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 POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT : GRAP

7、HIC 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 OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACT

8、OR, 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 VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCAL MOU

9、NTING 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, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERF

10、ORM 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 STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF T

11、RYING 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 MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.S OF

12、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 FLASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED T

13、O 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 IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND

14、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 follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create con

15、flict 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 Receiver AC power cord from the AC power source before: (1) Removing or reinsta

16、lling 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 capacitor. Caution : A wrong part substitution or incorrect polarity ins

17、tallation 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 contacts by applying an appropriate contact cleaning solution to the contacts

18、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 instruments covered by this service manual might be equipped. 5. Do not a

19、pply 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 connecting the test instrument positive lead. Always remove the test instrument

20、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 resistance between each blade of the attachment plug and accessible conductive pa

21、rts (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 damaged easily by static electricity. Such components commonly are call

22、ed 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 incidence of component damage caused by static electricity. 1. Immediate

23、ly 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 discharging wrist strap device, which should be removed for potential shock rea

24、sons 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 exposure of the assembly. 3. Use only a grounded-tip soldering iron to

25、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 freonpropelled chemicals. These can generate electrical charge sufficient to damag

26、e 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 conductive foam, aluminum foil, or comparable conductive material). 7. lmmedi

27、ately 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 applied to the chassis or circuit, and observe all other safety precautions

28、. 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 electricity sufficient to damage an ES device.) 1-6 SPECIFICATIONS Amplifi

29、er Section Output Power (Front) : F.T.C Rating: 60 watts RMS 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 H

30、armonic Distortion (Front) : 0.02 % (at 60 watts, 1 kHz) Delay Time : DOLBY DIGITAL : REAR : 0 - 15 ms CENTER : 0 - 5 ms DOLBY PRO LOGIC : REAR : 15 - 30 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

31、 : 20 Hz - 65 kHz, +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 Vide

32、o Section Input 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

33、 (Without notes 100.1 MHz, 65 dBf) Tuning Range : 87.5 MHz - 108.0 MHz C: 50 kHz steps AH: 100 kHz steps AM Suppression Ratio: C: 45 dB AH: 60 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) : C: 40 dB AH: 3

34、5 dB Signal-to-Noise Ratio : Mono : 75 dB Stereo : 70 dB AM Tuner Section Tuning Range: C : 522 kHz - 1,620 kHz (9 kHz steps) AH : 530 kHz - 1,720 kHz (10 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 Requir

35、ements : C : 230V AC, 50Hz AH : 120V AC, 60Hz Power Consumption : C: 1.2A AH: 2.3A AC Outlets : unswitched x 1, Total 100 W max. (1A) (AH Version only) Dimensions (W x H x D) : 285 x 133 x 348 Weight (net) : 8.8kg 1-7 LOCATION OF CUSTOMER CONTROLS POWER STANDBY/ON button VFL Display PHONES BASS/TREB

36、LE Tone Controls MASTER VOLUME Control BALANCE Control SOURCE SELECTOR Control AUDIO Signal jacks VIDEO Signal jacks PRE OUT jack DIGITAL OUT jacks SPEAKER terminals (For AH version only) Dolby Digital / DTS / PCM DIGITAL IN jacks S-VIDEO Signal jacks FRONT PANEL REAR PANEL 1-8 SURROUND MODE indicat

37、or TUNED indicator RDS indicator MEMORY indicator TUNER MUTE indicator INPUT SOURCE, FREQUENCY, LEVEL indicator DELAY TIME, PRESET CHANNEL indicator VFL DISPLAY REMOTE CONTROL 1. POWER ON/OFF button (L75/L55) 2. SLEEP button (L75) 3. INPUT SOURCE Selector buttons (L75) 4. SURROUND MODE button (L75)

38、5. TEST TONE button (L75) 6. NUMERIC button (L75/L55) 7. PROGRAM button (L55) 8. OSD ON/OFF button (L75), DVD SET UP button (L55) 9. DIGITAL INPUT/RDS button (L75), DVD DISPLAY button (L55) 10. TITLE button (L55) 11. MENU buttons (L55) 12. ARROW buttons (L75/55) VOLUME UP/DOWN, PRESET UP/DOWN button

39、s (L75) 13. ENTER button (L75/55) 14. RETURN button (L55) 15. MUTE button (L75) 16. OPEN/CLOSE buttons (L55) 17. STOP button (L55) 18. PLAY button (L55) 19. FOR/ REV, SCAN/SKIP button (L55) 20. SLO W buttons (L55) 21. PAUSE/STEP button (L55) 22. REPEAT button (L55) 23. CLEAR button (L55) 24. AUDIO b

40、utton (L55) 25. ANGLE button (L55) 26. ZOOM button (L55) 27. SUBTITLE button (L55) 28. SWITCH 10C:KRE1A037LOCKER KUP11396-6PCB , HEADPHONE SUB PCB 1 1 1 1 1 1 1 1 1 1 1 1 1 SPECIAL SCREW 4KTB4+6FFZ KTB3+6JFZ KTB3+10GFZ 66 67 SCREW SCREW SCREW BDMMDN4RB4MRC TRANS , MAIN TRANS , SUB TUNER,MODULE MOTOR

41、 KUP11431-4PCB , CONNRCTOR KUP11395-3PCB , PSU KUP11395-2PCB , TRANS KUP11395-1PCB , MAIN KUP11431-2PCB , AC OUTLET KUP11431-3PCB , SUB TRANS KUP11431-1PCB , SPEAKER KUP11397-2PCB , SURROUND AMP KUP11397-1PCB , FRONT AMP KUP11398 PCB , SURROUND KUP11396-1PCB , U-COM KUP11396-7PCB , GUIDE KUP11396-5P

42、CB , SVIDEO INPUT KUP11396-4PCB , VIDEO INPUT KUP11396-2/31 12SUPPORT, H/S KUP11396-1 KMH1A119 4 4 7 1 10 15 8 12 2 7 KHD1A016 KTS3+8J SPECIAL SCREW SCREW KTB3+6F KTB3+10G KTWS3+10G KHD1A012 KTB3+8J KTB3+16J KSN2+4 SCREW SCREW SCREW SCREW SCREW SCREW SCREWKTB3+6J 52 51 54 56 55 58 60 59 57 53 2 4 5

43、KTW3+16J KTW3+8J KTB4+6J SCREW SCREW SCREW 62 64 63 65 61KTW3+14JSCREW4 AC CORD 1HOLDER, PCB KMY1A116SINK, HEAT(R) KHE170 KGL1A188 1 3 1 KBT1A745M7K102 KBT1A756M7K102 KGU1A245A10 1 1 KGW1A299 KDD1A013 WINDOW, SENSOR KNOB, DISPLAY FAN PANEL, SUB KNOB, POWER PCB , AUDIO INPUT KMH1A117COVER, FAN 1 2 1

44、3 1 1.2 1 1 1 1KMY1A115 KGU1A244A8 KGK1A064ZA KGK2A064YA KGK1A063ZA KKM1A062C26 SINK, HEAT(F) WINDOW,FIP INDICATOR,POWER VOLUME KNOB ASSY(A) VOLUME KNOB ASSY(B) VOLUME KNOB ASSY AL PANEL SIDE BAR 1 1 1 1 1 1 PANEL , REAR CHASSIS , BOTTOMKUA1A190 6KHE1A023PCB MOUNT 1 1 46 BHG1A171 48 47 Q,tyPARTS-NO

45、44 45 43 36 37 39 38 35 41 42 40 26 33 34 31 32 1 29 30 1 27 28 1KKC1B082S21 4 4 BKL1A060 KHR1A028 TOP CABINET FOOT FOOT CUSHION AC CORD BUSHING 21 22 24 25 23 11 12 14 16 17 15 18 19 20 13 6 7 9 10 8 DESCRIPION 5 4 3 2 1 N0 X2 3 64 X10 61X4 56 X2 64X2 X2 60 X2 53 X4 X4 63 x6 x6 59 26 x6 58 x6 26 59

46、 x9 x6 58 40 x2 x2 x4 60 57 13 46 38 42 22 21 x6 53 X260 x3 x4 17 x4 x4 63 19 18 29 47 41 31 30 34 6639 37 65 45 43 35 25 16 15 48 14 36 62 33 12 11 8 7 6 x3 5 55 44 9 8 10 4 x253 X754 x2 x4 x4 52 2 1 51 X1066 32 X21 67 24 23 2KHG1A198RUBBER , TRANS C:KLT5L052ZE C C 27 X10 C:BNVTFCE1E319A KKM1A105ZC

47、26 C:KLT5V026ZE C:14 C:19 C:BJA2B044Z C:KKF1A212ZK1 2 AH:KLT5L052ZU 22 AH 39 AH AH:BNVTFCE1U116A AH:KLT5V026ZU AH:13 AH:21 AH:KKF2A212YK1 AH:BJA523FBY 1-91-10 EXPLODEDVIEW 2-11 SECTION 2 ELECTRICAL CONTENTS CONTENTS IC BLOCK DIAGRAMS & PIN DESCRIPTION . 2-11 1. IC81 (TMP87PS71F u-COM). 2-12 2. IC34 (YSS912C AC3/DTS Decoder) .