NAD-M25-pwr-sm 维修电路原理图.pdf

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NAD-M25-pwr-sm 维修电路原理图.pdf

SERVICE MANUALSERVICE MANUALM25 C/AHMODEL :M3SERVICE MANUAL NAD 2005NAD ELECTRONICS INTERNATIONALTORONTOM25 C/AHSEVEN CHANNEL AMPLIFIERM25 C/AHSEVEN CHANNEL AMPLIFIERSEVEN CHANNEL AMPLIFIERRadioFans.CN 收音机爱好者资料库CONTENTSFRONT PANEL/REAR PANELVIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?3SPECIFICATIONS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 4ALIGNMENT PROCEDURE/ALIGNMENT POINTS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?5-6WIRING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?7SCHEMATIC DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?8-16PCB LAYOUT? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 17-23ELECTRICALPARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?24-40EXPLODED VIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 41-44EXPLODED VIEW PARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?45PACKING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?46SERVICE SAFETY PRECAUTIONS1. Replacing the FusesCAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIREREPLACE ONLY WITH SAME TYPE OF FUSE.REFERENCE NO.PART NUMBERDESCRIPTIONRear PanelAH20-11203-10MDAT20AL/250VC20-12103-20MDAT10AL/250VAMP BoardF101/F10220-12632-00T6.3AL/250VPSU BoardF201-F20420-12162-01T1.6AL/250VNOTE:*AH : North American version only*C: European version only2. Safety-check out (North American model only)Before returning the product to the customer, make leakage current orresistance measurements to determine that exposed parts are acceptablyinsulated from the supply circuit.Parts marked with the symbolare critical with regard to the risk of fire andelectric shock.Replace only parts recommended by the manufacturer.- 2 -RadioFans.CN 收音机爱好者资料库FRONT PANEL / REAR PANEL VIEWFRONT PANEL CONTROLS1. POWER SWITCH2. POWER INDICATOR3. SOFT CLIPPING INDICATOR4. PROTECTION INDICATOR1. AC INLET2. INPUT JACK3. LEVEL CONTROL4. SPEAKER TERMINALS5. AUTO TRIGGER SWITCH6. 12V TRIGGER INPUT7. SOFT CLIPPING SWITCH8. MAINS FUSE9. GROUND TERMINAL- 3 - 4 -SPECIFICATIONSCONTINUOUS AVERAGE POWER?160 W (22.0 dBW)OUTPUT INTO 8 OHMS OR 4 OHMS(Min. power per channel, 20 Hz 20 kHz, bothchannels driven, with no more than rateddistortion)Rated Distortion?0.03%(THD 20 Hz 20 kHz)Clipping power?180 W(maximum continuous power per channel).IHF dynamic power(Maximum short term power per channel)8 ohms:?220 W (23.4 dBW)4 ohms:?385 W (25.9 dBW)2 ohms:?485 W (26.9 dBW)Damping factor180(ref. 8 ohms 50Hz)Input ImpedanceR = 1 MohmsC = 180 pFInput sensitivity (for rated output into 8 ohms)1250mV+/-50mVVoltage gain29 dBFrequency response 20 Hz 20 kHz?0.2 dB- 3dB at 3 Hz/70 kHzSignal / Noise ratio, A-weighted96 dB ref. 1 W118 dB ref. 160WDIMENSIONS AND WEIGHTSNet Weight44.5 kg (98.0 Ib)Shipping Weight53 kg (116.7 Ib)Dimension (WHD)435 200 465.6mmALIGNMENT PROCEDUREA. THERMAL SENSE ADJUSTMENTThis adjustment should be always done when the M25 is cool condition. (That means thetemperature inside the unit should be almost same as the ambient temperature.Connector P208B that connects the transformer and power board should be removed toavoid that the Idling current heats up the unit excessively) At ambient temperature of 25 Cdegrees and when the unit is just turned on (still in cool condition), adjust the potRV103(as marked as “Thermal Sense ADJ” in below drawing) for a voltage between theTHERMAL TEST POINT and AGND to be 750mV+/-10mV. If the ambient temperature isdifferent, the voltage setting should be changed by 20mV per degree difference. So at20C degrees, the voltage should be 850mV+/-10mV; and at 30C degrees, the voltageshould be 650mV+/-10mV, etc.B. DC OFFSET VOLTAGEThe DC OFFSET between OFFSET Test Point and AGND must be within 0+/-3mV. If itsfound to be out of this range, change the TL084BCD to one selected for low offset voltageto meet the requirement.C. IDLING CURRENTThe idling current in the output stage of the poweramp should be set to 40mA+/-10mAper pnp-npn transistor pair( This means the mid point voltage is 17.6mV with down limit of13.2mV and up limit of 22mV). The alignment procedure is: At first, adjust RV102 (Markedas “Idling Current ADJ” in the drawing below) for a voltage of 17.6mV +/- 1mV betweenTest point 1 and 2. Then preheat the unit for 5 minutes, let idling current settled and thenreadjust to 17.6mV +/- 1mV.Pls note:1.The idling current must be adjusted when all modules are assembled into the unit.2.Though the idling current is set as 17.6mV +/-1mV during the adjustment, due to theinfluence of varied ambient temperature and mains voltage etc., the idling current will driftafter some time. During the normal checking of idling current in the service field, itsacceptable as long as the voltage is in the range of 13.2mV22.0mV.D. ISC Current sense zero-set.The ISC current-sensing voltage at no signal should be 0mV+/-50mV. During factoryalignment, it is set to 0mV+/-10mV . That is to adjust Pot RV104 (as marked as “ISCSENSE ADJ” in the below drawing) to get a voltage between the “ISC SENSE TESTPOINT” and AGND to be 0mV+/-10mV.(Pls note the ISC should be adjusted when all modules are plugged in. Its not possible to get0mV +/-10mV if any of the modules are removed.)E. Fan Cut Off Point AdjustmentCheck the Fan sense voltage first. Turn Pot RV201 to the end clockwise and confirm TP2of J201 is in negative voltage. Run the unit to heat it up and drive the fan to start turning,- 5 -for example, all 7 channels at 50W/4ohms for 10 minutes or 5 minutes or even less (aslong as the fan can starts turning). Turn off the signal but still keep the unit operating for 1minute. Then run all 7 channels at 1kHz, 0.25W at 4 ohms load, monitor the voltage atTP1 of Pot RV201. Adjust RV201 to get the voltage from negative to positive to ensurethat the Fans are turned off. Then run all 7 channels at 1kHz, 0.5W at 4 ohmsload, monitor if the voltage at TP1 of Pot RV201 is negative, if not, adjust Pot RV201 justto the point that TP1 changes from positive to negative (to get the fans just start turning).Finally, turn off the signal and monitor if fans stop turning within about 30s Max.- 6 -ISC SENSE ADJAGNDACINACINACOUTACOUT+5V+5VRELAYRELAYSC NPNSC PNP+18V-18V+70V-70VPROTECTSENAC OFF+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROTECTSENAC OFFSC NPNSC PNP+62V-62V-62VAGNDAGNDAGNDISC TRIGAGND+62V+18V-18V+70V-70VPROT1SEN1ACOFFSCN_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_1+62V_4+18V-18V+70V-70VPROT2SEN2ACOFFSCN_4SCP_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_2+62V_4+18V-18V+70V-70VPROT3SEN3ACOFFSCN_4SCP_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_3+62V_4+18V-18V+70V-70VPROT4SEN4ACOFFSCN_4SCP_4+62V_4-62V_4-62V_4AGND4AGND4AGND4ISCTRIG_4+62V_4+18V-18V+70V-70VPROT5SEN5ACOFFSCN_3SCP_3+62V_3-62V_3-62V_3AGND6AGND6AGND6ISCTRIG_5+62V_3+18V-18V+70V-70VPROT6SEN6ACOFFSCN_3SCP_3+62V_3-62V_3-62V_3AGND6AGND6AGND6ISCTRIG_6+62V_3+18V-18V+70V-70VPROT7SEN7ACOFFSCN_3SCP_3+62V_3-62V_3-62V_3AGND6AGND6AGND6ISCTRIG_7+62V_3+62V_4+62V_4-62V_4-62V_4AGND4AGND4AGND4AGND4AGND6AGND6AGND6AGND6+62V_3+62V_3-62V_3-62V_3SCLEDSCLEDDGNDDGNDPROT7PROT1PROT6PROT2PROT5PROT3PROT4+8V+8VSTBYSTBYISCTRIG_4ISCTRIG_3DGNDISCTRIG_2ISCTRIG_1SEN5AGNDSEN4SEN6SEN3SEN7ISCTRIG_7SEN2SEN1ISCTRIG_6ISCTRIG_5DGND+18V-18V+70VACOFF-70VFAN2FAN3AGNDFAN1FAN1DGNDFAN2DGNDFAN3DGNDSCP_4+8VDGNDSCLEDSCN_4SCP_3SCN_3+62V_3-62V_3SCP_4-62V_4+62V_4STBY+8VDGNDSCLEDSCN_4SCP_3SCN_3+62V_3-62V_3SCP_4-62V_4+62V_4STBYDGNDPROT7AGNDPROT1PROT6PROT2PROT5PROT3PROT4+8V+8VSCLEDSTBYSTBYSCLEDDGNDISCTRIG_4ISCTRIG_3DGNDISCTRIG_2ISCTRIG_1SEN5AGNDSEN4SEN6SEN3SEN7ISCTRIG_7SEN2SEN1ISCTRIG_6ISCTRIG_5DGND+18V-18V+70VACOFF-70VFAN2FAN3AGNDFAN1AGND4AGND4AGND4AGND4+62V_4+62V_4-62V_4-62V_4AGND6AGND6AGND6AGND6+62V_3+62V_3-62V_3-62V_3PROT1+12VDPROT6PROT2SCLEDPROT3STBYLEDPROT4PROT3PROT5PROT4PROT5+5VDPROT7DGNDDGNDPROT1+12VDPROT6PROT2SCLEDPROT3STBYLEDPROT4PROT3PROT5PROT4PROT5+5VDPROT7DGNDDGND+12V-12V+18V-18V+70V-70V-62V_4+62V_4-62V_3+62V_3+/-12V digital voltageregulators+/-18V analog voltageregulators+/-70V analog voltageregulatorsHigh current 4 channelanalog voltage rectifyHigh current 3 channelanalog voltage rectifyPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDPOWERAMP BOARDTRIG&SC BOARDCONNECTION BOARDPOWER SUPPLY BOARDSTANDBY BOARDPOWER SWITCH BOARDLED DISPLAY BOARDTO P209BTO P208BTO P501BTO P502BTO P504BTO P505B12P101AP101A123456789P622BP622B12P301AFLEX 16PIN 1.0mmP301AFLEX 16PIN 1.0mm12345678910111213141516P616BP616B123456789P202AP202A12345678P611BP611B123456789P620BP620B12345678P503BP503B12P102AP102A123456789FAN2FAN212P608BP608B123456789P618BP618B123456789101112P101AP101A1234567891234P101AP101A123456789P613BP613B123456789P201AP201A12345678P204BP204B12345678910111213141516P207BP207B1234P619BP619B12345678P504BP504B12P206BFLEX 16PIN 1.0mmP206BFLEX 16PIN 1.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 t12345678910111213141516P101AP101A123456789P208BP208B1234512P614BP614B123456789P623BP623B12P102AP102A123456789P501BP501B1212345P102AP102A123456789P606BP606B123456789- 7 -WIRING DIAGRAMINPUTOFFSETISCTRIG+62VSEN62VTESTPOINT 5+12V-12V+12V-12V+12V-12V-12VOFFSET+62VSENISC62VINPUTTP5SC NPNSC PNP/1KV/1/2W/1%TEMP SENAll Polyester capacitors are 63V unless noted.All Elec. capacitors are 50V unless noted.All Resistor are 1/6W RJ13 unless noted./1KV/1KV/1KV/1%/1%/1%/3W/1%/1%INPUT BUFFER/16V/1KVISC COMPARATOR/1%I/V/1/2W/1KV/1KV/1KVSMD 0805SMD 0805C103180pFC103180pFC10810nFC10810nFCWRV104100KCWRV104100K132Q144MPSA92Q144MPSA92R11782R11782R1E31.5KR1E31.5K+C1491uF+C1491uFD1341N4148D1341N4148R1A70.05R1A70.05R1061KR1061KC10222pFC10222pFR1161.8KR1161.8KR1A210KR1A210KR1201KR1201KQ1452SC4793Q1452SC4793R1A647KR1A647KR1101KR1101KC153470pFC153470pFR118470R118470R123100R123100C111100nFC111100nFR1151KR1151K+C1511uF+C1511uFR1211KR1211KR111ATOR111ATOQ1102SC1815Q1102SC1815+C110100uF+C110100uFQ1092SC2240Q1092SC2240C11622pFC11622pFC1151nFC1151nFD1306.8VD1306.8VD1351N5404D1351N5404R112976R112976R10982R10982D132BAV21D132BAV21C10715pFC10715pFR1A96.8KR1A96.8KR1A5220KR1A5220KJ101RCAJ101RCA12+-IC104ATL082CP+-IC104ATL082CP321Q1042SC2240Q1042SC2240R1022.2megR1022.2megR1192.2megR1192.2megD1331N4148D1331N4148R199220KR199220KR1G1100R1G1100+C1131uF+C1131uFQ1122SK170Q1122SK170D1011N4148D1011N4148R11422KR11422KC1011nFC1011nFQ1062SC2240Q1062SC2240R1E13.3KR1E13.3KF101T6.3AL/250VF101T6.3AL/250VR1A1220KR1A1220KG1G1Ground Solder TapG1G1Ground Solder Tap1C10610pFC10610pFQ1012SA970Q1012SA970C100180pFC100180pFR1A3470KR1A3470KC114100nFC114100nF+-IC104BTL082CP+-IC104BTL082CP56784R1E0470KR1E0470KQ1132SA970Q1132SA970Q1112SA1015Q1112SA1015R1E233KR1E233KQ1032SA970Q1032SA970R11382R11382C1G1100nFC1G1100nFQ1082SA970Q1082SA970D1314.7VD1314.7VQ1072SC2240Q1072SC2240+C1481uF+C1481uFR1081KR1081KC1041nFC1041nFQ1002SK170Q1002SK170R1A4220KR1A4220KR198100KR198100KC10547pFC10547pFR122100R122100Q1052SC2240Q1052SC2240Q143MPSA92Q143MPSA92R103470R103470CWRV103500CWRV103500132C10922pFC10922pFR100470R100470R1A0390KR1A0390KR1052.2megR1052.2megR10147R10147D1001N4148D1001N4148CWRV1015KACWRV1015KA13245R1A8100R1A8100+C1501uF+C1501uFR1041KR1041KQ1022SK170Q1022SK170R1071KR1071K+C1121uF+C1121uFD129BAV21D129BAV21SCHEMATICS DIAGRAM- 8 -+62V-62V+68VISCTRIGAGNDSC NPNOUTPUTOUTPUTAC OFFAGND-62VAGNDAC OFFSC PNP-62VSEN-18VPROTECT-68V+62V+18VOFFSETISCTRIGTP2TP1SENOFFSETAGNDSC NPNSC PNPAGNDTP5TP5SENAGNDAGND-18V-18VPROTECTPROTECTPROTECTPROTECT+68V-68V+68VAGND+18VAC OFF-62V-68V-18VPROTECT+62V+12V+12V+12V-12V-12V+12V-12V-12V+12V+12VOFFSET+62V62VSC NPNSC PNPINPUTISCTP5SENPOWER ON/OFF DETECTDC OFFSET DETECTCURRENT DETECTMUST USE UL&CSA CERTIFIED/1%/1KV/1KV/1KV/250V/1KV/250V/250V/25V/25V/25V/25V/25VCONNECT TO CONNECTION BOARDCOPPER STRIPS/1/2W/1W/1W/1W/2W/5W/5W/5W/5W/1W/1W/1%/1%IDLING CURRENT SETTING:ADJUST RV102 LET VOLTAGE BETWEEN TP101 AND TP102: 17.6mVFAN&ISC SENSITIVITY SETTINGADJUST RV103 LET VOLTAGE AT SEN PORT: +750mV/25DegRESISTORS ARE CARBON FILM 1/6W UNLESS SPECIFIEDOUTecbGNDeGND2SK170TO-92OUTTO-2202SA18372SC4793INb2SA9702SA10152SC18152SC2240bcTO-92TO-922N4403MPSA42MPSA92SGecTO-220cNJM79M12Ab2SA13602SC3423INTO-126TO-220DeNJM78M12Aebc2SA19432SC5200TO-264/1/4W/1/2W/1KV/16V/16V/1KV/6.3VAll Polyester capacitors are 63V unless noted.All Elec. capacitors are 50V unless noted.All Resistor are 1/6W RJ13 unless noted./1KV/1KV/250V/1KV/250V/250V/100V/100V/1KV/1KV/1/4W/1/4WTP2TP1SENOFFSETTP5AGNDQ1192SA1015Q1192SA1015R1301KR1301KR1N4220KR1N4220KC133470pFC133470pFQ1182SA1015Q1182SA1015D1131N4148D1131N4148D1191N4148D1191N4148+C117100uF+C117100uFR134100R134100R1P62KR1P62KC156100nFC156100nFD1141N4148D1141N4148Q1252SC2240Q1252SC2240R18010KR18010KR137180R137180R1503.9KR1503.9KR1P12KR1P12KR1274.7KR1274.7KR132100R132100R18420KR18420KQ127MPSA92Q127MPSA92C16147nFC16147nFR14747KR14747KR1582.2R1582.2R1P4100R1P4100D109L-513ADD109L-513ADR1421KR1421KC13568pFC13568pFR12410KR12410K+C15710uF+C15710uFR195100KR195100KR1612.2R1612.2P102AMOLEX 41662 RIGHT ANGLEP102AMOLEX 41662 RIGHT ANGLE112233445566778899R189510KR189510KD1271N4148D1271N4148R1620.22R1620.22P101AMOLEX 41662 RIGHT ANGLEP101AMOLEX 41662 RIGHT ANGLE112233445566778899R143100R143100C141100nFC141100nFD1241N4148D1241N4148R157100R157100C123100nFC123100nFQ1312SA1837Q1312SA1837C120100nFC120100nF+C127100uF+C127100uFD1391N4148D1391N4148CB10190deg THERMAL CIRCUIT BREAKERCB10190deg THERMAL CIRCUIT BREAKER12R1650.22R1650.22C12910nFC12910nFD1281N4148D1281N4148+C122100uF+C122100uFRNI3N.I.RNI3N.I.+C1341000uF+C1341000uFR1640.22R1640.22R139100R139100R1N6220R1N6220R1452.78KR1452.78KR1521.43KR1521.43KR18122KR18122KD138BAV21D138BAV21R19720KR19720KR1922.21KR1922.21KCWRV102300CWRV102300132D1201N4148D1201N4148Q1142S

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