NAD-M27-pwr-sm 维修电路原理图.pdf

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1、NADSERVICE MANUAL M27SEVENCHANELM27 SEVEN CHANELAMPLIFIER AMPLIFIERRadioFans.CN 收音机爱 好者资料库TABLE OF CONTENTS DESCRIPTION P A G E SERVICE CAUTION.3-4SPECIFICATIONS. 5WIRING DIAGRAM.6 BLOCK DIAGRAM. .7-9 .12-25 PCB LAYOUT.26-33ELECTRICAL PARTS LIST. 95-43. . .EXPLODED VIEW. 60-63EXPLODED VIEW PARTS LIS

2、T.64 CIRCUIT DIAGRAMSTROUBLE SHOOTING A GUIDE.10TROUBLE SHOOTING B GUIDE.11RadioFans.CN 收音机爱 好者资料库3SUBJECT: GRAPHIC SYMBOLSPRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTSA.C. VOLTMETERGOOD EARTH GROUNDSUCH AS THE WATERPIPE. CONDUIT. ETCPLACE THIS PROBEON EACH EXPOSEDMETAL PARTCAUTION : DO NOT

3、 ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOM-IZED INSTALLATIONS WITHOUT MANUFACTURERSAPPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROP-ERTY DAMAGE OR USER INJURY.SERVICE WORK SHOULD BE PERFORMED ONLY AFT

4、ER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVIC-ING GUIDELINES. TO DO OTHERWISE,INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.WHILE SERVICING, USE AN ISOLATION TRANS-FORMER FOR PROTECTION FROM A.C. LINESHOCK.SAFETY CHECKSAFTER THE ORIGINAL SERVICE P

5、ROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.SUBJECT : FIRE & SHOCK HAZARD1.BE SURE THAT ALL COMPONENTS ARE POSI- TIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.THIS IS ESPE-CIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR

6、 SHOP.2. NEVER RELEASE A REPAIR UNLESS ALL PROTEC-TIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE-BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLAR-IZED LINE PLUG HAS NOT BEEN DEFEATED.3. SOLDERI

7、NG MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CER-TAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND R

8、EPLACE IF NECES-5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT

9、 USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOM-MENDED CIRCUIT MODIFICATIONS.7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PER-FORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLEAND SCREWS) TO BE SURE THE SET I

10、S SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANS-FORMER DURING THIS TEST USE AN A.C. VOLTME-TER, HAVING 5000 OHMS PER VOLT OR MORE SEN-SITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETW

11、EEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT,ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLT-AGE ACROSS THE COMBINATION OF 1500OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASURE-MENTS FOR EACH EXPOSED METALLIC PART. VOLT-AGE MEA

12、SURED 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 COR-RECTED IMMEDIATELY.THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDEDTO ALERT THE SERVICE PERSONNEL TO TH

13、E PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” 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 SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SERVICING PR

14、ECAUTIONS CAUTION:Before servicing the Stereo amplifier 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 safety precautions in this public

15、ation, always follow the safety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the Stereo amplifier 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 reconn

16、ecting any internal electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an electrolytic capacitor. Caution: A wrong part substitute or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals

17、 on or near this Stereo amplifier 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 applicator. Unless specified other

18、wise 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 Stereo amplifier and/or any of its electrical assemblies unless all soli

19、d-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 attachment plug from the AC

20、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 1 M-ohm. Note 1: Accessible Conductive Parts including Me

21、tal 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 Es devices are integrated

22、 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 handing any semiconductor component or semiconductor-equipped assembly, drain of

23、f 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 reason prior to applying power to the unit under test. 2. After removing an electrical assembl

24、y 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 removal device. Some solder

25、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 its protective package until imm

26、ediately 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. Immediately before removing the protective material from the leads of a replacement ES device, tou

27、ch 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 replacement ES devices. (Normally harmles

28、s 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.)4SPECIFICATIONSFRANAISESPAOLITALIANODEUTSCHNEDERLANDSSVENSKA5* Gross dimensions include feet, buttons and rear panel term

29、inals.* Non-metric measurements are approximate. NAD Electronics will not assume any liability for errors being made by retailers, custom installers, cabinet makers, or other end users based on information contained in this document.Note: Installers should allow a minimum clearance of 55mm for wire/

30、cable management.M27Continuous output power into 8 and 4 180W (ref. rated THD, 20Hz-20kHz, all channels driven)THD +N (250mW to rated power, CCIF IMD, DIM 100)0.005% (ref. 20Hz - 20kHz)IHF Dynamic Power 8 Ohms4 Ohms2 Ohms320W700W650WSignal/Noise Ratio, A-weighted98dB (ref. 1W) 120dB (ref. rated powe

31、r)Damping Factor750dB (ref. 8 , 50Hz and 1kHz)Frequency Response -2.5dB at 3Hz and 100kHzInput Impedance RCAXLR47k C=100pF220k C=100pFInput Sensitivity1.3V (ref. rated power)Time to Standby Mode at no input signal30 minutesVoltage Gain29dBGENERALRated Power1600W (120V 60Hz, 230V 50Hz)Standby Power0.

32、5WIdle Power90WUnit Dimension (WxHxD) - Gross*435 x 156 x 380mm17 1/8 x 6 3/16 x 15 inches*Net weight14.1kg (31.1lb)Shipping weight20.4kg (45lb)67OPLME49720CMRTL072DC servoTL072OPLME49720HypexNC400 OEM ModuleMicro controllerIIC/SPI/GPIOPIC18F26K20LEDTOUCHTRIGGERIICAnalog Inputunbalancedbalanced100-1

33、20VAC220-240VACSTB PSU5VMAIN PSU+/-VB+/-VDR+/-VAUXLDOACENABLE3V3Regulated supplyLM317/LM337+/-17.5VRegulated supplyLM317/LM337+/-14.5VClipping controlerOPA2134RelayCurrent sensorTL084CNSTBAudio sense on/off3.5mmCY8CMBR2044CHANNEL 1/ 7 Block diagramMCU BOARDPIC18F26K208InstructionDecode andControlPOR

34、TAPORTBPORTCRA4/T0CKI/C1OUTRA5/AN4/SS/HLVDIN/C2OUTRB0/INT0/FLT0/AN12RC0/T1OSO/T13CKIRC1/T1OSI/CCP2(1)RC2/CCP1RC3/SCK/SCLRC4/SDI/SDARC5/SDORC6/TX/CKRC7/RX/DTRA3/AN3/VREF+RA2/AN2/VREF-/CVREFRA1/AN1RA0/AN0RB1/INT1/AN10Data LatchData MemoryAddress LatchData Address12AccessBSRFSR0FSR1FSR2inc/declogicAddr

35、ess4124PCH PCL PCLATH831-Level StackProgram CounterPRODLPRODH8 x 8 Multiply8BITOP88ALU2088Table Pointerinc/dec logic218Data BusTable Latch8 IR123ROM LatchRB2/INT2/AN8RB3/AN9/CCP2(1)PCLATUPCUOSC2/CLKOUT(3)/RA6Note1:CCP2 is multiplexed with RC1 when Configuration bit CCP2MX is set, or RB3 when CCP2MX

36、is not set.2:RE3 is only available when MCLR functionality is disabled.3:OSC1/CLKIN and OSC2/CLKOUT are only available in select oscillator modes and when these pins are not being used as digital I/O.Refer to Section 2.0 “Oscillator Module (With Fail-Safe Clock Monitor)” for additional information.R

37、B4/KBI0/AN11RB5/KBI1/PGMRB6/KBI2/PGCRB7/KBI3/PGDEUSARTComparatorMSSP10-bitADCTimer2Timer1Timer3Timer0CCP2HLVDECCP1BORDataEEPROMWInstruction Bus STKPTRBank8State machinecontrol signalsDecode88Power-upTimerOscillatorStart-up TimerPower-onResetWatchdogTimerOSC1(3)OSC2(3)VDD,Brown-outResetInternalOscill

38、atorFail-SafeClock MonitorPrecisionReferenceBand GapVSSMCLR(2)BlockLFINTOSCOscillator16 MHzOscillatorSingle-SupplyProgrammingIn-CircuitDebuggerT1OSOOSC1/CLKIN(3)/RA7T1OSIPORTEMCLR/VPP/RE3(2)FVRFVRFVRCVREFAddress LatchProgram Memory(8/16/32/64Kbytes)Data LatchCLOCKOSCILLATOR5.85 V4.9 VSOURCE(S)SRQDCM

39、AXBYPASS/MULTI-FUNCTION(BP/M)+-VILIMITFAULTPRESENTCURRENT LIMITCOMPARATORENABLELEADINGEDGEBLANKINGTHERMALSHUTDOWN+-DRAIN(D)REGULATOR5.85 VBYPASS PINUNDER-VOLTAGE1.0 V + VTENABLE/UNDER-VOLTAGE(EN/UV)Q115 A25 ALINE UNDER-VOLTAGERESETAUTO-RESTARTCOUNTERJITTER1.0 V6.4 VBYPASSCAPACITOR SELECT AND CURRENT

40、LIMIT STATEMACHINEOVPLATCHSMPS STB BOARDTNY2749TROUBLESHOOTING A GUIDE10YESCheck STB boardCheck LED board5V RIGHT?check IC301 circuitNONOLogo Amber LED on?No Power or Power shuts offimmediately5VL RIGHT?NOCheck L104 C175 C176YESCheck Q110 Q111 Q114 Q115 Q116 circuitChange LED boardYESNOBTouch Power

41、keyLogo led turn white?YESchange STB boardCheck PWM signalYESLogo led turn off?Logo led turn red?YESNOYESCheck PSU board+/-VB +/-VAUX +/-VDR RIGHT?NOCheck STB boardSTB 3V RIGHT?YESChange PSU BoardCheck U1 U5 PWM circuitNOCheck STB Board:Q301 K301 circuitCheck MCU board:Q131 circuitYESCheck Regulated

42、 Supply BoardVPP VPI +/-17.5V +/-VDR RIGHT?NOCheck Regulated Supply BoardCheck Q123 Q124 circuitYESCheck U104,Change MCU boardCheck LED control signalTROUBLESHOOTING B GUIDE11BFinishRear panel led show green?YESNOled turn off?Rear panel led show red?NOYESCheck D500 U505 circuit,YESCheck Q500 Q502 Q5

43、08 circuitChange NC400 OEM BOARDApply 1khz sinewave to DUTAmplifier output correct?YESNOINC INH signal correct?YESChange NC400 OEM BOARDcheck+/-14.5V,5V Right?NOcheckQ505 Q506 CircuitNOchange AMP boardYEScheckU500 U501 U502 U503 Circuitchange AMP boardcheckQ503 Q504 Circuit 1.MCU BOARD12CIRCUIT DIAG

44、RAMXM100HOLEC16222NR282100RGNDXM101HOLEC16322NR283100RGND3V3SC13822u/ 6v3C139100NGNDMCLR/VPP/RE31RA0/AN0/C12IN0-2RA1/AN1/C12IN1-3RA24RA35RA46RA5/HLVDIN7VSS8OSC1/CLKIN/RA79OSC2/CLKOUT/RA610RC011RC112RC213RC3/SCK/SCL14RC4/SDI/SDA15RC5/SDO16RC6/TX/CK17RC7/RX/DT18VSS19VDD20RB0/INT0/FLT0/AN1221RB1/INT122

45、RB2/INT223RB3/AN924RB4/KBI025RB5/KBI1/PGM26RB6/KBI2/PGC27RB7/KBI3/PGD28U105PIC18F26K20GNDC137NCR21622kR20810kR21033kGNDVHP1C133100ND1193V63V3SGNDGNDR238100RR220100RR197100RPGDATAPGCLKMCLRRXDTXDGND3V3S1234P109Header 4R268100RR269100RC152100nL103FBGNDC147100NGNDRXDTXDMCLR3V3SGNDPGCLKPGDATA12345CON103I

46、CSPR21410KNMOSIq11q22q33q44q55q66q77gnd8qh9/sclr10sck11rck12/g13ser14q015vcc16U10474HC595GNDC136100NGND3V3D3V3DNCK0R209B100RR209D100RR209C100RR209A100RR213B100RR213C100RR213D100RR213A100R3V3SSH/LD1CLK2E3F4G5H6QH7GND8QH9SER10A11B12C13D14CLK INH15V CC16U103HC165R190A10kGND3V3DC120100nGND3V3DC121100N3V

47、3DGNDR190B10kR190C10kR190D10kNCK1GNDR189A10kR189B10kR189C10kR189D10kq11q22q33q44q55q66q77gnd8qh9/sclr10sck11rck12/g13ser14q015vcc16U10674HC595GNDC141100NGND3V3D3V3DR230B100RR230D100RR230C100RR230A100RR237B100RR237C100RR237D100RR237A100RNCS2GNDC140100NNCS1R226100RR222100RR219100RR225100RR228100RR2311

48、00RR235100RNMOSINMIS ONCK0NCK1NMIS ONCS2NCS1123456789101112131415161718192021222324252627282930313233343536P100TO AMP board AVPPiVPNiSCL-aSDA-aR1260RR1230RR1280RR1300RGPOa0R1330RGNDVDR-VDR+17.5V-17.5VR1310RR1350RAudioS5VSVCLIP0becQ105DTC114EKAD124ss12G1OUT2IN3O4U108ASM1117-3.3C155100nC158100n5VS3V3S

49、C15122u/ 6V33V3SGNDL102742792662C15910nR24110kR23910KQ135DTC114EKAGNDGDSQ132APM23135VS5VDC1461NGNDGND5VENL101742792662G1OUT2IN3O4U107ASM1117-3.3C153100nC157100n3V3DC15022u/ 6V33V3DGNDC15422u/ 6V35VDGNDR1210RGNDC10110NC10210NGNDGNDR1190RR1200R1234567891011121314151617181920212223242526272829303132333

50、43536P101TO AMP board AVPPiVPNiSCL-aSDA-aR1690RR1680RR1700RR1720RGPOa1R1770RGPOb1GNDVDR-VDR+17.5V-17.5VR1740RGPI1R1780RAudioS5VSVCLIP1R1653K9GNDC10810NC10910NGNDGNDR1580RR1610R123456789101112131415161718192021222324252627282930313233343536P102TO AMP board AVPPiVPNiSCL-aSDA-aR1930RR1920RR1940RR1960RG