NAD-T973-pwr-schp2 维修电路原理图.pdf

Preliminar yISSUE DATE: September 2005T 973Seven Channel AmplifierPRELIMINARY SCHEMATICS updated alignment proceduresRadioFans.CN 收音机爱 好者资料库ALIGNMENT PROCEDURE (T973) A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be controlled within 0+/-3mV. If its found to be out of this range, change the TL084BCD to get it meet the requirement. B. IDLING CURRENT The idling current at the final stage of the unit should be set to about 40mA+/-10mA. Adjust RV102 (As marked as “Idling Current ADJ” in the enclosed drawing below) to control the voltage between Idling current Test point 1 and 2 to be 8mV +/- 2mV. Preheat the unit for 10 to 15 minutes, and then readjust to 8mV +/- 2mV. (Please note: The idling current must be adjusted when all modules are assembled into the unit.) C. ISC SENSITIVITY Adjust Pot RV104 (as marked as “ISC SENS ADJ” in the below drawing) to get the voltage across “ISC SENS TEST POINT” and AGND to be 0mV+/-10mV. (Please note that the ISC should be adjusted when all modules are assembled into the unit. Its not possible to get 0V +/-10mV if the modules are not assembled. D. THERMAL SENSE ADJUSTMENT The adjustment should be always done when the T973 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 to heat up the unit excessively) At ambient temperature of 25 C degree and when the unit is just turned on (still in cool condition), adjust the pot RV103 (as marked as “THERMAL SENS ADJ” in the below drawing) to get voltage across the THERMAL TEST POINT and AGND to be 750mV +/-10mV. While the ambient temperature is different, the voltage will vary as well. There is a relation between the temperature and voltage, that is; if the ambient temperature is 20 degree C, the voltage should be 850mV+/-10mV; if the ambient temperature is 30 degree C, the voltage should be adjusted to 650mV+/-10mV, etc. E. Fan Cut Off Point Adjustment Note: This Fan cut off function does not appear on PCB V10.0, V11.0 or MKII version but only appeared on PCB V12.0. Run the unit for all 7 channels at 1 kHz, 4ohms load, and 250mW output. Do this adjustment when the unit heats up, for example; run the unit at all 7 channels at 50W/4ohms for 10 minutes. Then adjust Pot RV201 on power supply board so the voltage at Pin14 of IC203 just changes from negative to positive (to get the fans just start turning). Then turn off the input signal and monitor if fans will stop within 30 seconds, then turn on the input signal again to see if the fans start turning immediately. RadioFans.CN 收音机爱 好者资料库 Preliminar yT 973 WIRING DIAGRAMPreliminar yAGND4-62V_4+62V_4AGND4+62V_4AGND4-62V_4AGND4PROT6DGNDSTBYDGNDPROT3SCLEDPROT4PROT7SCLEDPROT5+8VPROT1PROT2STBYAGND+8V-68V+68VDGNDAGNDACOFF+18VFAN2-18VFAN3FAN1+8VAGND6+62V_3AGND6-62V_3AGND6+62V_3DGNDSCLEDSCN_3SCN_4SCP_4+62V_3SCP_3-62V_3-62V_4+62V_4-68VSCN_3+18VACOFF-18V+68VPROT5SEN5SCP_3-68VSCN_3+18VACOFF-18V+68VPROT6SEN6SCP_3-68VSCN_3+18VACOFF-18V+68VPROT7SEN7SCP_3AGND6B+62V_3B-62V_3B-62V_3BAGND6B+62V_3BAGND6A+62V_3A-62V_3A-62V_3AAGND6AAGND6A+62V_3A+62V_3-62V_3-62V_3AGND6AGND6+62V_3-68VSCN_4+18VACOFF-18V+68VPROT1SEN1SCP_4AGND4A+62V_4A+62V_4A-68VSCN_4+18VACOFF-18V+68VPROT2SEN2SCP_4AGND4B+62V_4B-62V_4BAGND4B-68VSCN_4+18VACOFF-18V+68VPROT3SEN3SCP_4AGND4+62V_4-62V_4-62V_4AGND4+62V_4+62V_4-62V_4-62V_4AGND4AGND4+62V_4-68VSCN_4+18VACOFF-18V+68VPROT4SEN4SCP_4STBYAGNDSEN2SEN3SEN5ISCTRIG_6ISCTRIG_7SEN1ISCTRIG_5ISCTRIG_3ISCTRIG_2AGND6BAGND6FAN1DGNDDGNDFAN2DGNDFAN3+62V_3+62V_3B+62V_3A-62V_3-62V_3B-62V_3AAGND6AGND6BAGND6AISCTRIG_1ISCTRIG_3ISCTRIG_5ISCTRIG_6ISCTRIG_7ISCTRIG_1SEN6SEN7DGNDISCTRIG_4SEN4AGND4AAGND4A-62V_4A-62V_4AISCTRIG_2AGND4B-62V_4B+62V_4BAGND4ISCTRIG_4AGND4-62V_3AGND6AGND4AAGND4BAGND4-62V_4A-62V_4B-62V_4+62V_4A+62V_4B+62V_4SCHEMATIC DIAGRAM(AMP CONNECTION)1122334455667788991010P603BS10B-PH-SM3-TBP603BS10B-PH-SM3-TB1122P622HEADER 2P622HEADER 2BUS606COPPER STRIPBUS606COPPER STRIP112233445566778899P608BMOLEX 2145/3215 TOP ENTRY/9PINP608BMOLEX 2145/3215 TOP ENTRY/9PIN1122P623HEADER 2P623HEADER 2112233445566778899P615BMOLEX 2145/3215 TOP ENTRY/9PINP615BMOLEX 2145/3215 TOP ENTRY/9PIN123456789101112P618BMOLEX 51021/12PIN/500mm WIREP618BMOLEX 51021/12PIN/500mm WIRE112233445566778899P609BMOLEX 2145/3215 TOP ENTRY/9PINP609BMOLEX 2145/3215 TOP ENTRY/9PINBUS603COPPER STRIPBUS603COPPER STRIP112233445566778899P616BMOLEX 2145/3215 TOP ENTRY/9PINP616BMOLEX 2145/3215 TOP ENTRY/9PIN112233445566778899P610BMOLEX 2145/3215 TOP ENTRY/9PINP610BMOLEX 2145/3215 TOP ENTRY/9PIN13579111315246810121416P601BMOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PINP601BMOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN112233445566778899P604BMOLEX 2145/3215 TOP ENTRY/9PINP604BMOLEX 2145/3215 TOP ENTRY/9PINBUS601COPPER STRIPBUS601COPPER STRIP1122334455667788P619BMOLEX 5145-NCH TOP ENTRY/8PINP619BMOLEX 5145-NCH TOP ENTRY/8PIN112233445566778899P617BMOLEX 2145/3215 TOP ENTRY/9PINP617BMOLEX 2145/3215 TOP ENTRY/9PIN112233445566778899P611BMOLEX 2145/3215 TOP ENTRY/9PINP611BMOLEX 2145/3215 TOP ENTRY/9PIN112233445566778899P605BMOLEX 2145/3215 TOP ENTRY/9PINP605BMOLEX 2145/3215 TOP ENTRY/9PIN112233445566778899P612BMOLEX 2145/3215 TOP ENTRY/9PINP612BMOLEX 2145/3215 TOP ENTRY/9PIN112233445566778899P606BMOLEX 2145/3215 TOP ENTRY/9PINP606BMOLEX 2145/3215 TOP ENTRY/9PIN13579111315246810121416P602BMOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PINP602BMOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PINBUS602COPPER STRIPBUS602COPPER STRIP112233445566778899P613BMOLEX 2145/3215 TOP ENTRY/9PINP613BMOLEX 2145/3215 TOP ENTRY/9PIN112233445566778899P607BMOLEX 2145/3215 TOP ENTRY/9PINP607BMOLEX 2145/3215 TOP ENTRY/9PINBUS604COPPER STRIPBUS604COPPER STRIP112233445566778899P614BMOLEX 2145/3215 TOP ENTRY/9PINP614BMOLEX 2145/3215 TOP ENTRY/9PIN1122334455667788P620BMOLEX 5145-NCH TOP ENTRY/8PINP620BMOLEX 5145-NCH TOP ENTRY/8PIN1122P621BHEADER 2P621BHEADER 2BUS605COPPER STRIPBUS605COPPER STRIPPreliminar ySTBY+62V_4+68VSEN5+18VSEN3STBYLEDSEN1SEN2-62V_4SEN3SEN7+5VDSEN6SEN4SEN5-18V+8VISCTRIG1.7ACOUTRELAYACINISCTRIG_2PROT3-68VFAN1SEN2ISCTRIG_7DGNDSCLEDSTBYAGND4FAN2SEN5+18V+68VISCTRIG_6ISCTRIG_7ISCTRIG_3SEN7ISCTRIG_1AGND4-18VACOFFAGND6+8VSEN3-68V-62V_3AGND6-62V_4AGND4FAN3SEN6SCLEDISCTRIG_4FAN1PROT4+8VDGNDISCTRIG_4DGNDPROT7ISCTRIG_1ISCTRIG_6+62V_3PROT2+62V_4-62V_4AGND4DGNDISCTRIG_2ISCTRIG_5STBY+62V_4SEN4SEN1FAN2+62V_3AGND6PROT6PROT5ISCTRIG_5FAN3PROT1AGND6ISCTRIG_3+62V_3-62V_3DGNDDGNDPROT7PROT3PROT2PROT4+5VDPROT5PROT1PROT6DGNDSCLEDDGND+12VDSTBYLED-62V_3ACOFF+68V-62V_4-18V-68V-62V_3+18V+62V_3+62V_4ACOFF+12VD-12VD-12VD+12VD+12VD+12VD+12VD+12VD+12VD+12VD+12VD+12VD+18V+18VFOR Q202FOR BR205&QT02FOR IC205FOR IC202FOR Q201FOR BR204&QT01FOR Q205FOR Q220FOR Q206FOR Q219FOR BR206&QT03CONNECT TO PROTECT ANDSOFTCLIPPING LED BOARDFOR QT04FOR Q218/1/2W/50V/80V/80V/1/2W/1/2W/1/2W/1/2W/1/2W/1/2W/1/2W/1%/1%/1%/1%/1%/1%/1%/1%/1%/1%/1%/1%/50V/50V/50V/50V/100V/100V/100V/100V/100V/100V/100V/100V/100V/100V/100V/1KV/100V/100V/100V/100V/100V/1KV/100V/100V/25V/25V/25V/25V/25V/25V/250V/250V/80V/250V/80V/50V/25V/1/2WFP/1/2WFP/100V/100V/1%/1%/1%/250V/250V/250V/250V/250V/250V/100V/250V/250V/250V/250V/80V/80V/100V/100V/100V/50V/100V/100V/100V/100V/100V/100V/100V/100VFOR IC201CONNECT TO AMP MODULE VIA CONNECTION BOARD/1/4W/1/4W/1/2W/1/2W/1/2W/1/2WHS20170-010003-0HS20170-010003-0D2154.3VD2154.3VHS20270-010003-0HS20270-010003-0D2134.3VD2134.3VC20510nC20510nC274100nC274100nR2021KR2021KR2071.5KR2071.5KO3I1G2IC201LM7812IC201LM7812R2011KR2011KR29210KR29210KR2251KR2251KQ2082SC1775Q2082SC1775R283N.I.R283N.I.R2571KR2571KR26310KR26310KC22310nC22310nD2041N4148D2041N4148+C23247u+C23247uR29510KR29510KQ2112SA1015Q2112SA1015C2502.2nC2502.2n+C215100u+C215100uQ2272SD667Q2272SD667G1O3I2IC202LM7912IC202LM7912C229100nC229100nQ2102SC1815Q2102SC1815C20410nC20410n312QT0230TPS08QT0230TPS08HS21370-010003-0HS21370-010003-0C22210nC22210nQ2172SD667Q2172SD667C22110nC22110n+C216100u+C216100uR26910KR26910K+-BR202DB104+-BR202DB104D2164.3VD2164.3VR206100R206100R254470R254470C206100nC206100n+C23310u+C23310u123456789101112P206B12P2.54-CP206B12P2.54-CR26410KR26410K+C20810u+C20810uR28010KR28010KC275100nC275100n+C2251000u+C2251000uR273100R273100+C2143900u+C2143900u+-BR204KBJ2506+-BR204KBJ2506C22010nC22010nR2371KR2371KR226220R226220Q2142SC1815Q2142SC1815Q219KSC2690AYSQ219KSC2690AYSQ205KSC2690AYSQ205KSC2690AYSQ221N.I.Q221N.I.R28510KR28510KR26810KR26810KR2911KR2911K1122334455667788P201AHEADER 8P201AHEADER 8R282N.I.R282N.I.+C24010u+C24010uD2021N4148D2021N4148D2144.3VD2144.3VC2512.2nC2512.2nF203T1.25AL/250VF203T1.25AL/250V+C24715000u+C24715000uQ2032SC1815Q2032SC1815R23410KR23410KR2551KR2551KC24210nC24210nR2042.2KR2042.2KHS20670-010003-0HS20670-010003-0321411+-IC203ATL084+-IC203ATL084C25810nC25810nR21310R21310R27243KR27243KR28110KR28110K+C23510u+C23510uR22712KR22712KR2161KR2161KR29710KR29710KR2221KR2221KR26610KR26610K+C20910u+C20910uR23310KR23310KD2051N4148D2051N41481122334455667788P202AHEADER 8P202AHEADER 8Q218KSC2690AYSQ218KSC2690AYS+C21747u+C21747uR23847R23847R2783.3KR2783.3KR28810KR28810KC2462.2nC2462.2nC2522.2nC2522.2nR205100R205100D2125.1VD2125.1VR23210KR23210KR24047R24047Q2242SC1815Q2242SC18151234P207B4P2.54-CP207B4P2.54-CBUS204COPPER STRIPBUS204COPPER STRIPHS20970-010002-0HS20970-010002-0D2174.3VD2174.3VC207100nC207100nR2793.3KR2793.3KD2081N4148D2081N4148D2091N4148D2091N4148+C21847u+C21847uQ2092SA872Q2092SA872Q2232SC1815Q2232SC1815R2212KR2212K121314+-IC203DTL084+-IC203DTL084C278100nC278100n+C228100u+C228100u+C25322000u+C25322000uC23047pC23047p13579111315246810121416P205BCON16AP205BCON16A+C203470u+C203470uR26510KR26510KR27043KR27043K312QT0330TPS08QT0330TPS08R2181.2KR2181.2K+-BR203DB104+-BR203DB104C271100nC271100nF201T1AL/250VF201T1AL/250VQ2042SA1015Q2042SA1015R2231KR2231K+C27910u+C27910u312QT0430TPS08QT0430TPS08BUS206COPPER STRIPBUS206COPPER STRIPD2071N4148D2071N4148R2451KR2451KR219220R219220Q2262SC1815Q2262SC18151098+-IC203CTL084+-IC203CTL0841122334455667788991010P203BHEADER 10P203BHEADER 10BUS202COPPER STRIPBUS202COPPER STRIPBUS201COPPER STRIPBUS201COPPER STRIPR2141KR2141KR2032.2KR2032.2KC2492.2nC2492.2n312QT0130TPS08QT0130TPS08BUS203COPPER STRIPBUS203COPPER STRIPR28910KR28910KQ2282SC1815Q2282SC1815C21210nC21210nC25610nC25610nR2351KR2351KC277100nC277100nC237100nC237100nD2194.3VD2194.3VD2031N4148D2031N414813579111315246810121416P204BCON16AP204BCON16AR2481KR2481KHS21070-010002-0HS21070-010002-0R2081.5KR2081.5KC276100nC276100n+-BR206KBJ2506+-BR206KBJ2506D211N.I.D211N.I.Q2162SB647Q2162SB647Q2292SC1815Q2292SC1815C257100nC257100nD2184.3VD2184.3VHS20570-010003-0HS20570-010003-0R252100KR252100KR217220R217220R26110KR26110KR28610KR28610K+C23110u+C23110uR25610KR25610KC236100nC236100nC20110nC20110nR2763.3KR2763.3KQ2122SB647Q2122SB647D2011N4148D2011N4148R212100R212100HS21170-010003-0HS21170-010003-0+C22747u+C22747uC21110nC21110nC2442.2nC2442.2n+-BR207DB104+-BR207DB10413121098147IC204ASN74HC21NIC204ASN74HC21NR24310KR24310KQ222N.I.Q222N.I.R29010KR29010KR29610KR29610KR274100R274100BUS205COPPER STRIPBUS205COPPER STRIPHS21270-010003-0HS21270-010003-0D210N.I.D210N.I.R27143KR27143KR29810KR29810KR2151KR2151KR24747R24747R26710KR26710KR24210KR24210KC273100nC273100nQ220KSC2690AYSQ220KSC2690AYS+C2241000u+C2241000uR2461KR2461KQ201KSA1220AYSQ201KSA1220AYSF204T1.25AL/250VF204T1.25AL/250VR28410KR28410KHS20370-010003-0HS20370-010003-0+-BR205KBJ2506+-BR205KBJ2506C23447PC23447PQ2252SC1815Q2252SC1815R2511KR2511KR24947R24947+C24815000u+C24815000uR22010KR22010KC21010nC21010n1122334455P209B5P3.96-CP209B5P3.96-C12456IC204BSN74HC21NIC204BSN74HC21N+C23810u+C23810u+C25422000u+C25422000uQ2152SA1015Q2152SA1015O3I1G2IC205LM7805IC205LM7805R2301KR2301KQ206KSA1220AYSQ206KSA1220AYSQ2132SD667Q2132SD667+C2551500u+C2551500uR26210KR26210KD2061N4007D2061N4007C21910nC21910nR24110KR24110K+C23910u+C23910uR2361KR2361KR2441KR2441KQ202KSC2690AYSQ202KSC2690AYSC2432.2nC2432.2nR2391KR2391KR22410R22410C24110nC24110nR22815KR22815KHS20470-010003-0HS20470-010003-0567+-IC203BTL084+-IC203BTL084R23110KR23110KF202T1AL/250VF202T1AL/250VR2294.7KR2294.7KR29310KR29310KR211470R211470R29410KR29410K1122334455P208B5P7.5-CP208B5P7.5-CHS20770-010002-0HS20770-010002-0R2773.3KR2773.3K+-BR201DB104+-BR201DB104Q2072SC1775Q2072SC1775Q2302SC1815Q2302SC1815HS20870-010002-0HS20870-010002-0C272100nC272100nR275100R275100+C202470u+C202470uR28710KR28710KR2531KR2531KHS21470-010003-0HS21470-010003-0C2452.2nC2452.2n+C2133900u+C2133900u+C22610u+C22610uPreliminar y7VW505 ONLY FOR C VERSION0VW503&W504 ONLY FOR AH VERSIONONLY USED FOR C VERSIONONLY USED FOR AH VERSIONNEUTRALLIVEP501B&P502B CONNECTTO EMC FITER MODULETO POWER SWITCH BOARDFROM POWER SUPPLY BOARDFROM MAIN TRANSFORMERTO MAIN TRANSFORMERSCHEMATIC DIAGRAM (AMP STANDBY)D5011N4148D5011N41481234P505B4P7.5-CP505B4P7.5-C1122P503B2P2.54-CP503B2P2.54-C3412RL501855AP-1A-CRL501855AP-1A-C1P501BJACKP501BJACK12W504JUMPERW504JUMPER151062tTR501T973 STANDBY TANStTR5011P502BJACKP502BJACKRV5010.5R030RV5010.5R03012W503JUMPERW503JUMPER12W502JUMPERW502JUMPER12W505JUMPERW505JUMPER1122P504B2P3.96-CP504B2P3.96-C12W501JUMPERW501JUMPER1234P207A4P2.54-A100BP207A4P2.54-A100BPreliminar yDGNDPROT5DGNDPROT7STBYLEDPROT4GREENPROT6PROT3PROT1STBYLED+5VDSCLEDSCLEDPROT7PROT6DGNDPROT2PROT3+12VDPROT2PROT5PROT4PROT1PROT7+12VDPROT1PROT6PROT4PROT5SCLEDPROT3DGNDPROT2+12VD+12VD+12VD+12VD+12VD+12VD+12VD+12VD+12VD+5VDSOFT CLIPPINGAGReTO-92c b2SC1815L-519EGW-CATHIS FOOTPRINT APPLYFOR HUADINGSCHEMATIC DIAGRAM(AMP SOFTCLIPPING AND PROTECT LED)R3211KR3211KR323470R323470R3132.2KR3132.2KAGRD301L-519EGW-CAD301L-519EGW-CA123456789101112P301A12P2.0-A350BP301A12P2.0-A350BR3142.2KR3142.2KQ3022SC1815Q3022SC1815Q3032SC1815Q3032SC1815D3101N4148D3101N4148Q3042SC1815Q3042SC1815112233P3023P2.54-CP3023P2.54-CD3141N4148D3141N4148Q3052SC1815Q3052SC1815R30210KR30210KR30310KR30310KQ3062SC1815Q3062SC1815R30410KR30410KD308L-513ADD308L-513ADR30510KR30510KQ3072SC1815Q3072SC1815R30110KR30110KR30610KR30610KD3111N4148D3111N4148Q3012SC1815Q3012SC1815R30710KR30710KD3151N4148D3151N4148D3091N4148D3091N4148R3082.2KR3082.2KR3151KR3151KAGRD302L-519EGW-CAD302L-519EGW-CAD3121N4148D3121N4148R3221.2KR3221.2KAGRD303L-519EGW-CAD303L-519EGW-CAAGRD304L-519EGW-CAD304L-519EGW-CAAGRD305L-519EGW-CAD305L-519EGW-CAR3161KR3161KR3171KR3171KAGRD306L-519EGW-CAD306L-519EGW-CAR3181KR3181KR3092.2KR3092.2KR3191KR3191KR3102.2KR3102.2KAGRD307L-519EGW-CAD307L-519EGW-CAR3112.2KR3112.2KR3201KR3201KD3131N4148D3131N4148R3122.2KR3122.2KPreliminary-62V_4STBY-62V_3DGNDDGNDDGNDDGNDSCP_4+62V_3SCLED+62V_4+8V+8VDGNDSCLEDSCN_4SCP_3SCN_3+62V_3-62V_3SCP_4-62V_4+62V_4STBYSCP_3SCN_4SCN_3SCN_3SCP_4DGNDSTBYSCP_3+62V_3+8V-62V_3SCLED+62V_4-62V_4SCN_4/1%/1%/1%/1%/1%/1%/1%/1%/1%/1%/1%/1%/1/2W/1/2W/1/2W/1/2W/50V/50V/50V/50V/1%R4081KR4081KR40447KR40447KR4131KR4131KR40347KR40347KR4091KR4091KR4101KR4101KD40430VD40430VR4051KR4051KR4111KR4111KR4061KR4061KD40330VD40330V+C40110u+C40110u+C40410u+C40410uR4121KR4121K+C40210u+C40210uR40147KR40147KR40247KR40247KD40230VD40230VD40130VD40130VR4071KR4071K12345678910111