NAD-D7050-int-sm 电路图 维修手册.pdf

《NAD-D7050-int-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《NAD-D7050-int-sm 电路图 维修手册.pdf（48页珍藏版）》请在收音机爱好者资料库上搜索。

1、NAD SERVICE MANUAL D7050 Direct Digital Network Amplifier D7050 Direct Digital Network Amplifier RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION.3-4 SPECIFICATIONS.5 WIRING DIAGRAM6-9 PCB LAYOUT.26-32 EXPLODED VIEW PARTS LIST.11a CONNECT A 1500 OHM 10 WATT RESISTOR, PAR

2、ALLELED 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 CAPACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGE MEASUREMENTS F

3、OR 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 : GRAPHIC SYMBOLS SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL A

4、NY 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 LEAKAGE IS A FACTOR, ETC. 3. AV

5、OID 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 APPROVED MOUNTING INSTRUCTIONS A P

6、RODUCT 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 INSTALLATIONS. 5. CAUTION CUSTOMERS A

7、GAINST 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 CASTERS ACROSS THRESHOLDS OR DEEP PI

8、LE 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. CAUTION CUSTOMERS AGAINST THE USE

9、 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 UNINSULATED “DANGEROUS VOLTAGE”

10、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 IN THE LITERATURE ACCOMPANYING

11、THE APPLIANCE. 3 RadioFans.CN 收音机爱 好者资料库 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 precauti

12、ons 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 reinstalling any component, circuit board, module, or

13、 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 installation of electrolytic capacitors may resul

14、t 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 with a pipe cleaner, cottontipped swab, or com

15、parable 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 apply AC power to this A/V Receiver and/or any

16、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 ground lead last. Insulation Checking Procedur

17、e 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 parts (Note 1) should be more than 1M-ohm. Note

18、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 called Electrostatically Sensitive (ES) Devices. E

19、xamples 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. Immediately before handling any semiconductor component

20、 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 reasons prior to applying power to the unit under

21、 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 solder or unsolder ES devices. 4. Use only an

22、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 damage ES devices. 6. Do not remove a replacement E

23、S 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. lmmediately before removing the protective material

24、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. 8. Minimize bodily motions when handing unpa

25、ckaged 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.) 4 AUDIO SPECIFICATIONS Rated power at 4 ohms50W Signal-to-Noise ratio (A

26、-weighted) 90 dB Crosstalk (1 kHz) 85dB Crosstalk (10 kHz) 70 dB Frequency response (20 Hz 20 kHz)0 dB to - 0.3 dB Total Harmonic Distortion 0.004 % IMD (SMPTE)0.02 % IMD (CCIF)0.003 % GENERAL SPECIFICATIONS Standby power 0.5W Supports bit rate/sample rateup to 24/192 (via Digital Audio input) up to

27、 24/96 (via Computer/Type B USB input) Unit dimensions W x H x D (Gross) 70 x 235 x 275 mm 2 / x 9 / x 10 / inches Shipping weight3.3 kg (7.3 lbs) NAD SHALL NOT BE HELD LIABLE FOR ANY TECHNICAL OR USER INTERFACE DISCREPANCIES IN THIS MANUAL. THE D 7050 OWNERS MANUAL MAY BE SUBJECT TO CHANGE WITHOUT

28、PRIOR NOTICE. CHECK OUT WWW.NADELECTRONICS.COM FOR THE LATEST VERSION OF THE D 7050 OWNERS MANUAL. SPECIFICATIONS ENGLISHPORTUGUSFRANAISESPAOLITALIANODEUTSCHNEDERLANDSSVENSKA 5 COA X2 OP TO1 SPD IF IN PU T INPUT FO R M A T VO LUM E TR EBLE, BA SS, EQ SAM PLE R AT E C O NV ER TER ZT A FILTER 4th O R

29、D ER NO ISE SH AP ER PW M O UT PU T PW M O UT PU T R EF M C LK 108M FS 2450 FS SAM PLER (ADC ) NO ISE SHA PER 3rd RRO CES SO R DDFA PW M R EF O U TPUT C H0 C H 1 PW M O UT PUT C H0 C H1 VC C VEE VEE VC C OUTPUT STAGE L OUTPU T STAGE R LF LF LO G IC D R IVERLO G IC D R IVER L CH OP FEED BAC K NET W O

30、 R K FEED BAC K NET W O R K TR IA N G LE CO M PA RA TO R TR IA N G LE CO M PA RA TO R INTE GRA TO R INTE GRA TO R C O NT R O L INTER FA C E GND GND R CH OP IIS DDFA Feedback Processor TRIG IN B U FFE R DDF A SPI MAIN PSU DC/DC+/ -8V +/- 29V Signal Power contro l Head phone Pre o ut/SUB Main Controle

31、r LDO +/ -5V R3V 3 PW M R EF O U TPUT C H2 - C H 7 AM S1117-3. 3 Plug in senser 3V 3 C S8416C Z Z SPD IF REC E IV E R 32 -192K Bridge Module Board CX870 Apple Ceriticiate IC M FI341S2500 I2C HOS T_IREQ WIFI IdeviceEthernet SPDIF SPDIF IIS 844K H z LDO 3V 3 LDO 1V 8 1V 8 3V 3 DC/DC 5V 2A5V 2A 5V S 5V

32、 3 1A 3. 3V1. 2V 3. 3V 1. 2V SPI 3V3 SPI Rail Detection Therm al Detect ion Therm al Detect ion Rail Detect ion Therm al Detect ion Rail Detect ion D D FA SPI IIS +/ -29V on+/ -29V on 3. 3V S V O LU M ESO U R C E TRIG & keys IR FRO NT PANE L CO NT ROL 3. 3V S 5VS5V S M ain PSU therm al DE TM ain PSU

33、 therm al DE T C hassi s C hassi s C hassi s C hassi s PSU BOARD AM P & PREAM P FPP BOARD BG PSU EN LEDSTBY K EY RST K EY S FOR AIRPLAY WPS (REAR PANE L) IIS Head Ph one OP RELAY OP RELAY M UTE OP RELAY HP DE TECT HP DE TECT HP DE TECT AMP COA X1 SPDIF SPDIF OP TO2 BT Bluetooth module IIS (TOUCH K E

34、Y) NAD O LED D ISPL A Y Direction Detector Power Factor Correction 400V DCHigh dynamic Isolated DC convertor LOW LOSS STANDBY PSU EMI FILTER A C INLET DC/DC +29V 5V 2A +/ -8V BLOCK DIAGRAM 6 Digital input: Serial interface & mix DSP: Programmable filtering & delay Amplifier: DSP, volume & PWM Digita

35、l audio PWM Serial configuration interface Serial output interface I2S I2S I2S I2S GPIO & Interrupt processing PWM PWM PWM SPIGPIO DSP: Programmable filtering & delay Amplifier: DSP, volume & PWM DSP: Programmable filtering & delay Amplifier: DSP, volume & PWM DSP: Programmable filtering & delay Amp

36、lifier: DSP, volume & PWM Digital input: Serial interface & mix Digital input: Serial interface & mix Digital input: Serial interface & mix Digital audio Digital audio Digital audio Digital input: Serial interface & mix DSP: Programmable filtering & delay Amplifier: DSP, volume & PWM Digital audio P

37、WM Serial configuration interface Serial output interface I2S I2S I2S I2S GPIO & Interrupt processing PWM PWM PWM SPIGPIO DSP: Programmable filtering & delay Amplifier: DSP, volume & PWM DSP: Programmable filtering & delay Amplifier: DSP, volume & PWM DSP: Programmable filtering & delay Amplifier: D

38、SP, volume & PWM Digital input: Serial interface & mix Digital input: Serial interface & mix Digital input: Serial interface & mix Digital audio Digital audio Digital audio ZXCZM800 AMP BOARD 7 Connection outline diagram for 8 single ended channels Master clock input Feedback control clocksFeedback

39、control clocks 4hC3hC2hCCh5 Ch6 Ch7 Ch0 Ch1 References & PWM Feedback 8 channel digital modulator device References & PWM Output stages and feedback controllers References & PWM References & PWM References & PWM References & PWM References & PWM References & PWM Feedback Feedback Output stages and f

40、eedback controllers Output stages and feedback controllers Output stages and feedback controllers Digital audio inputs Control I/OGPIOBISTSupplies Master clock input Feedback control clocksFeedback control clocks 4hC3hC2hCCh5 Ch6 Ch7 Ch0 Ch1 References & PWM Feedback 8 channel digital modulator devi

41、ce References & PWM Output stages and feedback controllers References & PWM References & PWM References & PWM References & PWM References & PWM References & PWM Feedback Feedback Output stages and feedback controllers Output stages and feedback controllers Output stages and feedback controllers Digi

42、tal audio inputs Control I/OGPIOBISTSupplies 8 AMP BOARD ZXCZM800&ZXCZA200 System architecture H bridgeFilter Digital audio input Gate driver ZXCZM800 Digital modulator Bridge supply Digital control input Digital feedback processor ZXCZA200 Analogue feedback processor Channel amplifier Channel DSP D

43、DFATMchip set H bridgeFilter Digital audio input Gate driver ZXCZM800 Digital modulator Bridge supply Digital control input Digital feedback processor ZXCZA200 Analogue feedback processor Channel amplifier Channel DSP DDFATMchip set 9 AMP BOARD Connect AC Cord from D7050 IS AMBER LED LIGH TED? PRESS

44、 STB TOUCH KEY MAKE THE U NIT WORK NORMALLY ? NO YES IS LED RED? CHECK THE LED CONTROL CIRCUIT, AND PROTECET CIRCUIT YES IS LED WHIT E? CHECK TOUCH BOARD , OR SOFTWARE ER ROR YES NO CHECK THE 5V SUPPLY CIRCUIT NO NO IS ALL POWER SUPPLIES OK? NO YES IS MOSFET BROKEN?CHECK THE OVC& VOV CIRCUIT NO IS I

45、R NORMAL? IS BLUETOOTH NORMAL? IS AIRPLAY NORMAL? IS 12V TRIGGER NORMAL? IS PREOUT NORMAL? OK YES YES YES YES YES YES NO CHECK BLUETOOTH CIRCUIT NO CHECK AIRPLAY SUPPLIES NO CHECK TRIGGER CIRCUIT NO CHECK CONNECTER TROUBLE SHOOTING GUIDE 10 1 2 3 4 14 5 9 7 8 11 10 12 13 6 D7050 PART LIST ITEMPART N

46、O.PART NAMEQTYREMARK 177-325001-2TOP COVER1 270-325011-1BADGE1 367-325001-2DREAR PLATE1 470-325001-4INNER PLATE1 570-325002-3HEAT SINK A 1 675-325003-0ANTENNA BRACKET1 766-325004-0VENT PLATE2 875-325002-0ROUND COVER6 977-325002-1BOTTOM COVER1 10J71-325002-0KNOB_SEC1 11J71-325001-0KNOB_VOL1 1276-3250

47、01-2CFROTN PANEL1 1366-325001-2DISPLAY BRACKET1 1466-325002-2SHIELD COVER1 11a Exploded View D7050 A 2 3 3 4 5 5 6 7 9 8 1 5 10 11 12 13 14 15 16 17 ITEM PN.NAME 114-22308-00 214-23324-00 314-23308-01 414-04306-00 529-04601-02 614-233006-00 714-23304-11 8A07-70022-18 914-23310-00 1001-23308-00PSU BO

48、ARD 1101-23307-00HEAD PHONE BOARD 1201-23302-00FPP BOARD 1301-23304-00SOURCE BOARD 1401-23303-00VOLUME BOARD 1501-23306-00TOUCH BOARD 1601-23301-00AMP BOARD 1701-23305-00TRIGGER BOARD Exploded View D7050 B 11b MC K0_OUT 1 MC K0_OUT 2 C KO0P1 V8 3 C KO0GND 4 PW MC K0_OUT 5 C KO0P3 V3 6 P1 V8 7 GND 8

49、C 1P1 V8 9 C H1_R EF0 10 C 1P3 V3 11 C 1GND 12 C H1_R EF1 13 C H1_R EF2 14 C H1_F B0 15 C H1_F B1 16 C O1P1 V8 17 C O1GND 18 C O1P3 V3 19 C H0_F B1 20 C H0_F B0 21 C H0_R EF2 22 C H0_R EF1 23 C 0GND 24 C 0P3 V3 25 C H0_R EF0 26 C 0P1 V8 27 P1 V8 28 GND 29 P3 V3 30 C H3_PW M2 31 C H3_PW M1 32 C H3_PW M0 33 C H2_PW M2 34 C H2_PW M1 35 C H2_PW M0 36 GND 37 P3 V3 38 C H1_PW M2 39 C H1_PW M1 40 C H1_PW M0 41 C H0_PW M2 42 C H0_PW M1 43 C H0_PW M0 44 P3V3 45 GND 46 P1V8 47 CH_0_1_AUDIO_SCK 48 CH_0_1_AUDIO_SD 49