NAD-T977-pwr-sm 维修电路原理图.pdf

LAUNAMECIVRESLAUNAMECIVREST977 C/AHDEL:OMT977LAUNAMECIVRES NAD 2012NAD ELECTRONICS INTERNATIONALTORONTOT977HA/CRE I F I LPMA LENNAHC NEVEST977HA/CRE I F I LPMA LENNAHC NEVESSEVEN CHANNEL AMPLIFIERRadioFans.CN 收音机爱 好者资料库CONTENTS FRONT PANEL/REAR PANEL VIEW 3 SPECIFICATIONS 4 ALIGNMENT PROCEDURE/ALIGNMENT POINTS 5-6 WIRING DIAGRAM 7 SCHEMATIC DIAGRAM 8-15 PCB LAYOUT 16-21 ELECTRICAL PARTS LIST 22-37 EXPLODED VIEW 38 EXPLODED VIEW PARTS LIST 39 PACKING DIAGRAM 40 SERVICE SAFETY PRECAUTIONS 1. Replacing the Fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF FUSE. REFERENCE NO. PART NUMBER DESCRIPTION Rear Panel AH 20-11203-10 MDA T20AL/250V C 20-12103-20 MDA T10AL/250V AMP Board F101/F102 20-12632-00 T6.3AL/250V PSU Board F201-F204 20-12162-01 T1.6AL/250V NOTE: *AH : North American version only *C : European version only 2. Safety-check out (North American model only) Before returning the product to the customer, make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit. Parts marked with the symbol are critical with regard to the risk of fire and electric shock.Replace only parts recommended by the manufacturer. - 2 - RadioFans.CN 收音机爱 好者资料库- 3 - - 4 - SPECIFICATIONS CONTINUOUS AVERAGE POWER 140 W (21.5 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz 20 kHz, both channels driven, with no more than rated distortion) Rated Distortion 0.03% (THD 20 Hz 20 kHz) Clipping power 170 W(22.3 dBW) (maximum continuous power per channel). IHF dynamic power (Maximum short term power per channel) 8 ohms: 230 W (23.6 dBW) 4 ohms: 390 W (25.9 dBW) 2 ohms: 450 W (26.5 dBW) Time to go to Standby mode at no input signal 30 minutes Damping factor 300 (ref. 8 ohms 50Hz) Input Impedance R = 1 Mohms C = 180 pF Input sensitivity (for rated output into 8 ohms) 1180mV+/-50mV Voltage gain 29 dB Frequency response 20 Hz 20 kHz 0.2 dB - 3dB at 3 Hz/100 kHz Signal / Noise ratio, A-weighted 96 dB ref. 1 W 125 dB ref. 140W DIMENSIONS AND WEIGHTS Net Weight 32.3 kg (71.2 Ib) Shipping Weight 36.5 kg (80.5 Ib) Dimension (WHD) 435 194 476mm ALIGNMENT PROCEDURE (T977) A. THERMAL SENSE ADJUSTMENT This adjustment should be always done when the T977 is cool condition. (That means the temperature inside the unit should be almost same as the ambient temperature. Connector P208B that connects the transformer and power board should be removed to avoid that the Idling current heats up the unit excessively) At ambient temperature of 25 C degrees and when the unit is just turned on (still in cool condition), adjust the pot RV103(as marked as “Thermal Sense ADJ” in below drawing) for a voltage between the THERMAL TEST POINT and AGND to be 750mV+/-10mV. If the ambient temperature is different, the voltage setting should be changed by 20mV per degree difference. So at 20C degrees, the voltage should be 850mV+/-10mV; and at 30C degrees, the voltage should be 650mV+/-10mV, etc. B. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-3mV. If its found to be out of this range, change the TL084BCD to one selected for low offset voltage to meet the requirement. C. IDLING CURRENT The idling current in the output stage of the poweramp should be set to 40mA+/-10mA per pnp-npn transistor pair( This means the mid point voltage is 17.6mV with down limit of 13.2mV and up limit of 22mV). The alignment procedure is: At first, adjust RV102 (Marked as “Idling Current ADJ” in the drawing below) for a voltage of 17.6mV +/- 1mV between Test point 1 and 2. Then preheat the unit for 5 minutes, let idling current settled and then readjust 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 the influence of varied ambient temperature and mains voltage etc., the idling current will drift after some time. During the normal checking of idling current in the service field, its acceptable as long as the voltage is in the range of 13.2mV22.0mV. D. ISC SENSITIVITY The ISC sensing voltage can allow 0mV+/-50mV. But, for the alignment process in our factory, we tighten the limit to 0mV+/-10mV. That is to adjust Pot RV104 (as marked as “ISC SENSE ADJ” in the below drawing) to get a voltage between the “ISC SENSE TEST POINT” and AGND to be 0mV+/-10mV. (Pls note the ISC should be adjusted when all modules are plugged in. Its not possible to get 0mV +/-10mV if any of the modules are removed.) E. Fan Cut Off Point Adjustment Check the Fan sense voltage first. Turn Pot RV201 to the end clockwise and confirm TP2 of 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 (as long as the fan can starts turning). Turn off the signal but still keep the unit operating for 1 minute. Then run all 7 channels at 1kHz, 0.25W at 4 ohms load, monitor the voltage at TP1 of Pot RV201. Adjust RV201 to get the voltage from negative to positive to ensure that the Fans are turned off. Then run all 7 channels at 1kHz, 0.5W at 4 ohms load, monitor if the voltage at TP1 of Pot RV201 is negative, if not, adjust Pot RV201 just to 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 - AGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNAGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNAGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNAGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNAGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNAGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNAGND+62V+62V-62V-62VAGNDAGNDAGNDISCTRIGAC OFFSENPROTECT-68V+68V-18V+18VSC PNPSC NPNSCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1STBYSTBY+8V+8VPROT4PROT3PROT5PROT2PROT6PROT1PROT7DGNDDGNDSCLEDSCLEDAGNDSEN1SEN2SEN7SEN3SEN6SEN4AGNDSEN5ISCTRIG_1ISCTRIG_2ISCTRIG_3ISCTRIG_4ISCTRIG_5ISCTRIG_6ISCTRIG_7DGNDSCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1SCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1SCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1SCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1SCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1SCN_4SCP_4+18V-18V+68V-68VPROT1SEN1ACOFF+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1STBY+8VDGNDSCLEDSCN_3SCN_4SCP_3SCP_4+62V_3-62V_3+62V_4-62V_4DGND-18V+18VACOFF+70V-70VFAN3FAN2FAN1DGNDFAN1DGNDFAN2DGNDDGNDFAN3+12VDPROT1PROT2PROT3PROT4PROT5PROT6PROT7SCLEDDGND+5VDSTBYLED15V15VAGND164V64V38V38VAGND253V53VON/OFFSTBYDGND-18V+18VACOFF+70V-70VFAN3FAN2FAN1DGNDSTBY+8VDGNDSCLEDSCN_3SCN_4SCP_3SCP_4+62V_3-62V_3+62V_4-62V_4PROT1STBYLEDPROT3+12VDPROT2PROT4+5VDPROT6PROT5SCLEDPROT7DGNDON/OFFSTBYSTBYSTBY+8V+8VPROT4PROT3PROT5PROT2PROT6PROT1PROT7DGNDDGNDSCLEDSCLEDAGNDSEN1SEN2SEN7SEN3SEN6SEN4AGNDSEN5ISCTRIG_1ISCTRIG_2ISCTRIG_3ISCTRIG_4ISCTRIG_5ISCTRIG_6ISCTRIG_7DGND+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1+62V_4A+62V_4A-62V_4A-62V_4AAGND4AAGND4AAGND4AISCTRIG_1+5VDRELAYDGNDAC SENSTO P611BTO P604BTO P612BTO P605BTO P613BTO P606BTO P614BTO P607BTO P615BTO P608BTO P616BTO P609BTO P617BTO P610BSTANDBY BOARDMAIN TRANSFORMERDISPLAY BOARDTHERMAL PROTECT BOARDPOWER SUPPLY BOARDCONNECTION BOARDPOWERAMP MODULE BOARDPOWERAMP MODULE BOARDPOWERAMP MODULE BOARDPOWERAMP MODULE BOARDPOWERAMP MODULE BOARDPOWERAMP MODULE BOARDPOWERAMP MODULE BOARDFROM P204BFROM P205BFROM P203BTO P603BTO P602BTO P601BTRIGGER BOARDTO P401BFROM P618BFROM P201ATO P620BCHANNEL 1CHANNEL 2CHANNEL 3CHANNEL 4CHANNEL 5CHANNEL 6CHANNEL 7TO CH1 P101ATO CH1 P102ATO CH2 P101ATO CH2 P102ATO CH3 P101ATO CH3 P102ATO CH4 P101ATO CH4 P102ATO CH5 P101ATO CH5 P102ATO CH6 P101ATO CH6 P102ATO CH7 P101ATO CH7 P102AFROM P202ATO FAN1TO FAN2TO FAN3TO P301ATO P506BFROM P207AFROM P2AFROM P1AFROM AC INLETFROM FUSETO P4ATO P3ATO J901FROM J204TO P619B FROM P206BTO P209BTO P208BTO P504BTO P505B120 deg thermal breakerP608BMOLEX 26-01-1099P608BMOLEX 26-01-1099123456789P102AMOLEX 41662P102AMOLEX 41662123456789P613BMOLEX 26-01-1099P613BMOLEX 26-01-1099123456789TP901115deg THERMAL CIRCUIT BREAKERTP901115deg THERMAL CIRCUIT BREAKER12P506BP506B1234P618B12PIN2.0-A580BP618B12PIN2.0-A580B234156789101112R1A147R1A147J102BINDDING POSTJ102BINDDING POST12J102BINDDING POSTJ102BINDDING POST12CONTACTS UPSIDEP602BMOLEX 52207-1690CONTACTS UPSIDEP602BMOLEX 52207-1690123456789101112131415161718P101AMOLEX 41662P101AMOLEX 41662123456789R1A47R1A47J102BINDDING POSTJ102BINDDING POST12P621B2PIN2.54-CP621B2PIN2.54-C12W1W1P101AMOLEX 41662P101AMOLEX 41662123456789P3AMOLEX 44441-2005P3AMOLEX 44441-200512345P610BMOLEX 26-01-1099P610BMOLEX 26-01-1099123456789P101AMOLEX 41662P101AMOLEX 41662123456789P2AMOLEX_51144-0200P2AMOLEX_51144-020012P607BMOLEX 26-01-1099P607BMOLEX 26-01-1099123456789R1A147R1A147F1FUSE HOLDERF1FUSE HOLDERP207AP207A2341P4AMOLEX_51144-0500P4AMOLEX_51144-050012345J102BINDDING POSTJ102BINDDING POST12P619BMOLEX 26-01-1089P619BMOLEX 26-01-108912345678P101AMOLEX 41662P101AMOLEX 41662123456789J9012PIN2.54J9012PIN2.5412P401B12PIN2.0-CP401B12PIN2.0-C123456789101112P616BMOLEX 26-01-1099P616BMOLEX 26-01-1099123456789P202AMOLEX 41662P202AMOLEX 4166212345678J102BINDDING POSTJ102BINDDING POST12R1A147R1A147W2W2P502BKY250P502BKY25012P201AMOLEX 41662P201AMOLEX 4166212345678P205BFLEX CONNECTOR DIP16P205BFLEX CONNECTOR DIP1612345678910111213141516TP904115deg THERMAL CIRCUIT BREAKERTP904115deg THERMAL CIRCUIT BREAKER12J101RCAJ101RCA12P617BMOLEX 26-01-1099P617BMOLEX 26-01-1099123456789P615BMOLEX 26-01-1099P615BMOLEX 26-01-1099123456789TP903115deg THERMAL CIRCUIT BREAKERTP903115deg THERMAL CIRCUIT BREAKER12P101AMOLEX 41662P101AMOLEX 41662123456789FAN1FANFAN1FAN12P102AMOLEX 41662P102AMOLEX 41662123456789P611BMOLEX 26-01-1099P611BMOLEX 26-01-1099123456789FAN3FANFAN3FAN12W3W3P209B5PIN3.96-CP209B5PIN3.96-C12453J102BINDDING POSTJ102BINDDING POST12P204BFLEX CONNECTOR DIP16P204BFLEX CONNECTOR DIP1612345678910111213141516R1A147R1A147P622B2PIN2.54-CP622B2PIN2.54-C12J101RCAJ101RCA12P1AMOLEX_44441-2004P1AMOLEX_44441-20041234P101AMOLEX 41662P101AMOLEX 41662123456789P102AMOLEX 41662P102AMOLEX 41662123456789J2042PIN2.54J2042PIN2.5412R1A1147R1A1147P623B2PIN2.54-CP623B2PIN2.54-C12tTR1T973MKII-B MAIN TRANSFORMERtTR1T973MKII-B MAIN TRANSFORMER12143456789101113151617P605BMOLEX 26-01-1099P605BMOLEX 26-01-1099123456789P505BMOLEX 43160-2104P505BMOLEX 43160-21041234J102BINDDING POSTJ102BINDDING POST12P102AMOLEX 41662P102AMOLEX 41662123456789P101AMOLEX 41662P101AMOLEX 41662123456789P504B2PIN3.96-CP504B2PIN3.96-C12R1A147R1A147U4AC INLETU4AC INLETP102AMOLEX 41662P102AMOLEX 41662123456789J101RCAJ101RCA12P301A12P2.0-A350BP301A12P2.0-A350B123456789101112P206B12PIN2.0-CP206B12PIN2.0-C123456789101112J101RCAJ101RCA12FAN2FANFAN2FAN12J107RCAJ107RCA12P614BMOLEX 26-01-1099P614BMOLEX 26-01-1099123456789CONTACTS UPSIDEP601BMOLEX 52207-1690CONTACTS UPSIDEP601BMOLEX 52207-1690123456789101112131415161718P604BMOLEX 26-01-1099P604BMOLEX 26-01-1099123456789P102AMOLEX 41662P102AMOLEX 41662123456789J101RCAJ101RCA12P102AMOLEX 41662P102AMOLEX 41662123456789P620BMOLEX 26-01-1089P620BMOLEX 26-01-108912345678P603B10PIN2.54-CP603B10PIN2.54-C123456789101112P606BMOLEX 26-01-1099P606BMOLEX 26-01-1099123456789P208BMOLEX 43160-2105P208BMOLEX 43160-210512345J101RCAJ101RCA12TP902115deg THERMAL CIRCUIT BREAKERTP902115deg THERMAL CIRCUIT BREAKER12P612BMOLEX 26-01-1099P612BMOLEX 26-01-1099123456789P501BPCFS2508P501BPCFS250812P609BMOLEX 26-01-1099P609BMOLEX 26-01-1099123456789P203B10PIN2.54-A60BP203B10PIN2.54-A60B23415678910- 7 - WIRING DIAGRAMINPUTOFFSETISCTRIG+62VSEN62VTESTPOINT 5+12V-12V+12V-12V+12V-12V-12VOFFSET+62VSENISC62VINPUTTP5SC NPNSC PNP/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./1%/1%/1%/3W/1%/1%INPUT BUFFER/16VISC COMPARATOR/1%I/V/1/2WR112976R112976C1151nFC1151nFR1071KR1071K+C1481uF+C1481uF+-IC104BTL082CP+-IC104BTL082CP56784R198100KR198100K+C1491uF+C1491uFR1061KR1061KC103180pFC103180pFR103470R103470R1211KR1211KG1G1Ground Solder TapG1G1Ground Solder Tap1J101RCAJ101RCA12R1A647KR1A647KCWRV103500CWRV103500132R1G1100R1G1100D1306.8VD1306.8VQ1082SA1312Q1082SA1312C1G1100nFC1G1100nFR1192.2megR1192.2megR1E13.3KR1E13.3KR1041KR1041KR1A3470KR1A3470KC1011nFC1011nFR1151KR1151KR1A210KR1A210KQ1092SC3324Q1092SC3324D132BAV21D132BAV21R11382R11382D1011N4148D1011N4148Q1002SK209Q1002SK209Q1052SC3324Q1052SC3324R1A70.05R1A70.05R111ATOR111ATOR11782R11782R1A0390KR1A0390KR199220KR199220KQ1042SC3324Q1042SC3324C1041nFC1041nFR123100R123100Q1132SA1312Q1132SA1312Q1452SC4793Q1452SC4793CWRV1015KACWRV1015KA13245+C1121uF+C1121uFD1001N4148D1001N4148CWRV104100KCWRV104100K132Q1062SC3324Q1062SC3324R1081KR1081KQ1072SC3324Q1072SC3324D1351N5404D1351N5404R1A96.8KR1A96.8KR1E0470KR1E0470KC114100nFC114100nFR1022.2megR1022.2megR100470R100470R1E31.5KR1E31.5KC10222pFC10222pF+C1501uF+C1501uF+C110100uF+C110100uFR1A5220KR1A5220KR1101KR1101K+C1511uF+C1511uFQ1012SA1312Q1012SA1312R1A4220KR1A4220KR122100R122100C153470pFC153470pF+C1131uF+C1131uFQ143MMBTA92Q143MMBTA92F101T6.3AL/250VF101T6.3AL/250VC11622pFC11622pFQ1022SK209Q1022SK209R10147R10147R10982R10982R1161.8KR1161.8KQ1112SA1015Q1112SA1015R118470R118470C100180pFC100180pFR1E233KR1E233KQ144MMBTA92Q144MMBTA92R1A8100R1A8100C10715pFC10715pFC10810nFC10810nFQ1122SK209Q1122SK209D1331N4148D1331N4148R1A1220KR1A1220KC10922pFC10922pFD1341N4148D1341N4148C10547pFC10547pFC10610pFC10610pFR1201KR1201KD1314.7VD1314.7VQ1102SC1815Q1102SC1815+-IC104ATL082CP+-IC104ATL082CP321D129BAV21D129BAV21R11422KR11422KR1052.2megR1052.2megC111100nFC111100nFQ1032SA1312Q1032SA1312- 8 - SCHEMATICS DIAGRAM+62V-62V+68VISCTRIGAGNDSC NPNAC OFFAGND-62VAGNDAC OFFSC PNP-62VSEN-18VPROTECT-68V+62V+18VISCTRIGTP2TP1SC NPNSC PNPSIGNALTP5SENAGNDAGND-18V-18VVo+68V-68VPROTECTOFFSETTP1TP5TP2SENAGNDOFFSETVo+68VAGND+18VAC OFF-62V-68V-18VPROTECT+62VSIGNAL+12V+12V+12V-12V-12V-12V-12V+12V+12VOFFSET+62V62VSC NPNSC PNPINPUTISCTP5SENPOWER ON/OFF DETECTDC OFFSET&CURRENT DETECTCERTIFIED COMPONENT/1%/250V/250V/250V/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 SPECIFIEDOU