NAD-T973-pwr-sch 电路图 维修手册.pdf

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1、Preliminar y ISSUE DATE: September 2005 T 973 Seven Channel Amplifier PRELIMINARY SCHEMATICS updated alignment procedures RadioFans.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

2、 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 Tes

3、t 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 t

4、he 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

5、 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 degr

6、ee 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

7、 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 doe

8、s 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

9、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

10、机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Preliminar y T 973 WIRING DIAGRAM Preliminar y AGND4 -62V_4 +62V_4 AGND4 +62V_4 AGND4 -62V_4 AGND4 PROT6 DGND STBY DGND PROT3 SCLED PROT4 PROT7 SCLED PROT5 +8V PROT1 PROT2 STBY AGND +8V -68V +68V DGND AGND ACOFF +18V FAN2 -18V FAN3 FAN1 +8V AGND6 +62V_3 AGND6 -62V_3

11、AGND6 +62V_3 DGND SCLED SCN_3 SCN_4 SCP_4 +62V_3 SCP_3 -62V_3 -62V_4 +62V_4 -68V SCN_3 +18V ACOFF -18V +68V PROT5 SEN5 SCP_3 -68V SCN_3 +18V ACOFF -18V +68V PROT6 SEN6 SCP_3 -68V SCN_3 +18V ACOFF -18V +68V PROT7 SEN7 SCP_3 AGND6B +62V_3B -62V_3B -62V_3B AGND6B +62V_3B AGND6A +62V_3A -62V_3A -62V_3A

12、AGND6A AGND6A +62V_3A +62V_3 -62V_3 -62V_3 AGND6 AGND6 +62V_3 -68V SCN_4 +18V ACOFF -18V +68V PROT1 SEN1 SCP_4 AGND4A +62V_4A +62V_4A -68V SCN_4 +18V ACOFF -18V +68V PROT2 SEN2 SCP_4 AGND4B +62V_4B -62V_4B AGND4B -68V SCN_4 +18V ACOFF -18V +68V PROT3 SEN3 SCP_4 AGND4 +62V_4 -62V_4 -62V_4 AGND4 +62V_

13、4 +62V_4 -62V_4 -62V_4 AGND4 AGND4 +62V_4 -68V SCN_4 +18V ACOFF -18V +68V PROT4 SEN4 SCP_4 STBY AGND SEN2 SEN3 SEN5 ISCTRIG_6 ISCTRIG_7 SEN1 ISCTRIG_5 ISCTRIG_3 ISCTRIG_2 AGND6B AGND6 FAN1 DGND DGND FAN2 DGND FAN3 +62V_3 +62V_3B +62V_3A -62V_3 -62V_3B -62V_3A AGND6 AGND6B AGND6A ISCTRIG_1ISCTRIG_3IS

14、CTRIG_5ISCTRIG_6ISCTRIG_7 ISCTRIG_1 SEN6 SEN7 DGND ISCTRIG_4 SEN4 AGND4A AGND4A -62V_4A -62V_4A ISCTRIG_2 AGND4B -62V_4B +62V_4B AGND4 ISCTRIG_4 AGND4 -62V_3 AGND6 AGND4A AGND4B AGND4 -62V_4A -62V_4B -62V_4 +62V_4A +62V_4B +62V_4 SCHEMATIC DIAGRAM(AMP CONNECTION) 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9

15、10 10 P603B S10B-PH-SM3-TB P603B S10B-PH-SM3-TB 1 1 2 2 P622 HEADER 2 P622 HEADER 2 BUS606 COPPER STRIP BUS606 COPPER STRIP 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P608B MOLEX 2145/3215 TOP ENTRY/9PIN P608B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 P623 HEADER 2 P623 HEADER 2 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8

16、8 9 9 P615B MOLEX 2145/3215 TOP ENTRY/9PIN P615B MOLEX 2145/3215 TOP ENTRY/9PIN 1 2 3 4 5 6 7 8 9 10 11 12 P618B MOLEX 51021/12PIN/500mm WIRE P618B MOLEX 51021/12PIN/500mm WIRE 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P609B MOLEX 2145/3215 TOP ENTRY/9PIN P609B MOLEX 2145/3215 TOP ENTRY/9PIN BUS603 COPPER

17、 STRIP BUS603 COPPER STRIP 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P616B MOLEX 2145/3215 TOP ENTRY/9PIN P616B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P610B MOLEX 2145/3215 TOP ENTRY/9PIN P610B MOLEX 2145/3215 TOP ENTRY/9PIN 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 P601B MOLEX 52

18、207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN P601B MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P604B MOLEX 2145/3215 TOP ENTRY/9PIN P604B MOLEX 2145/3215 TOP ENTRY/9PIN BUS601 COPPER STRIP BUS601 COPPER STRIP 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 P619B MO

19、LEX 5145-NCH TOP ENTRY/8PIN P619B MOLEX 5145-NCH TOP ENTRY/8PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P617B MOLEX 2145/3215 TOP ENTRY/9PIN P617B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P611B MOLEX 2145/3215 TOP ENTRY/9PIN P611B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4 4

20、5 5 6 6 7 7 8 8 9 9 P605B MOLEX 2145/3215 TOP ENTRY/9PIN P605B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P612B MOLEX 2145/3215 TOP ENTRY/9PIN P612B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P606B MOLEX 2145/3215 TOP ENTRY/9PIN P606B MOLEX 2145/3215 T

21、OP ENTRY/9PIN 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 P602B MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN P602B MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN BUS602 COPPER STRIP BUS602 COPPER STRIP 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P613B MOLEX 2145/3215 TOP ENTRY/9PIN P613B MOLE

22、X 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P607B MOLEX 2145/3215 TOP ENTRY/9PIN P607B MOLEX 2145/3215 TOP ENTRY/9PIN BUS604 COPPER STRIP BUS604 COPPER STRIP 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 P614B MOLEX 2145/3215 TOP ENTRY/9PIN P614B MOLEX 2145/3215 TOP ENTRY/9PIN 1 1 2 2 3 3 4

23、 4 5 5 6 6 7 7 8 8 P620B MOLEX 5145-NCH TOP ENTRY/8PIN P620B MOLEX 5145-NCH TOP ENTRY/8PIN 1 1 2 2 P621B HEADER 2 P621B HEADER 2 BUS605 COPPER STRIP BUS605 COPPER STRIP Preliminar y STBY +62V_4 +68V SEN5 +18V SEN3 STBYLED SEN1 SEN2 -62V_4 SEN3 SEN7 +5VD SEN6 SEN4 SEN5 -18V +8V ISCTRIG1.7 ACOUT RELAY

24、 ACIN ISCTRIG_2 PROT3 -68V FAN1 SEN2 ISCTRIG_7 DGND SCLED STBY AGND4 FAN2 SEN5 +18V +68V ISCTRIG_6 ISCTRIG_7 ISCTRIG_3 SEN7 ISCTRIG_1 AGND4 -18V ACOFF AGND6 +8V SEN3 -68V -62V_3 AGND6 -62V_4 AGND4 FAN3 SEN6 SCLED ISCTRIG_4 FAN1 PROT4 +8V DGND ISCTRIG_4 DGND PROT7 ISCTRIG_1 ISCTRIG_6 +62V_3 PROT2 +62

25、V_4 -62V_4 AGND4 DGND ISCTRIG_2 ISCTRIG_5 STBY +62V_4 SEN4 SEN1 FAN2 +62V_3 AGND6 PROT6 PROT5 ISCTRIG_5 FAN3 PROT1 AGND6 ISCTRIG_3 +62V_3 -62V_3 DGND DGND PROT7 PROT3 PROT2 PROT4 +5VD PROT5 PROT1 PROT6 DGND SCLED DGND +12VD STBYLED -62V_3 ACOFF +68V -62V_4 -18V -68V -62V_3 +18V +62V_3 +62V_4 ACOFF +

26、12VD -12VD -12VD +12VD +12VD +12VD +12VD +12VD +12VD +12VD +12VD +12VD +18V+18V FOR Q202 FOR BR205&QT02 FOR IC205 FOR IC202 FOR Q201 FOR BR204&QT01 FOR Q205 FOR Q220 FOR Q206 FOR Q219 FOR BR206&QT03 CONNECT TO PROTECT AND SOFTCLIPPING LED BOARD FOR QT04 FOR Q218 /1/2W /50V /80V /80V /1/2W/1/2W/1/2W

27、/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

28、 /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 /100V FOR IC201 CONNECT TO AMP MODULE VIA CONNECTION BOARD /1/4W /1/4W /1/2W /1/2W /1/2W /1/2W HS201 70-010003-0 HS201 70-010003-0 D215 4.3V D215 4.3V H

29、S202 70-010003-0 HS202 70-010003-0 D213 4.3V D213 4.3V C205 10n C205 10n C274100nC274100n R202 1K R202 1K R207 1.5K R207 1.5K O 3 I 1 G 2 IC201LM7812IC201LM7812 R201 1K R201 1K R292 10K R292 10K R225 1K R225 1K Q208 2SC1775 Q208 2SC1775 R283 N.I. R283 N.I. R257 1K R257 1K R263 10K R263 10K C223 10n

30、C223 10n D204 1N4148 D204 1N4148 + C232 47u + C232 47u R295 10K R295 10K Q211 2SA1015 Q211 2SA1015 C250 2.2n C250 2.2n + C215 100u + C215 100u Q227 2SD667 Q227 2SD667 G 1 O 3 I 2 IC202 LM7912 IC202 LM7912 C229 100n C229 100n Q210 2SC1815 Q210 2SC1815 C204 10n C204 10n 3 12 QT0230TPS08QT0230TPS08 HS2

31、13 70-010003-0 HS213 70-010003-0 C222 10n C222 10n Q217 2SD667 Q217 2SD667 C221 10n C221 10n + C216 100u + C216 100u R269 10K R269 10K +- BR202 DB104 +- BR202 DB104 D216 4.3V D216 4.3V R206 100 R206 100 R254 470 R254 470 C206 100n C206 100n + C233 10u + C233 10u 1 2 3 4 5 6 7 8 9 10 11 12 P206B 12P2

32、.54-C P206B 12P2.54-C R264 10K R264 10K + C208 10u + C208 10u R280 10K R280 10K C275100nC275100n + C225 1000u + C225 1000u R273 100 R273 100 + C214 3900u + C214 3900u +- BR204 KBJ2506 +- BR204 KBJ2506 C220 10n C220 10n R237 1K R237 1K R226 220 R226 220 Q214 2SC1815 Q214 2SC1815 Q219 KSC2690AYS Q219

33、KSC2690AYS Q205 KSC2690AYS Q205 KSC2690AYS Q221 N.I. Q221 N.I. R28510KR28510K R268 10K R268 10K R291 1K R291 1K 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 P201A HEADER 8 P201A HEADER 8 R282 N.I. R282 N.I. + C240 10u + C240 10u D202 1N4148 D202 1N4148 D214 4.3V D214 4.3V C251 2.2n C251 2.2n F203 T1.25AL/250V F2

34、03 T1.25AL/250V + C247 15000u + C247 15000u Q203 2SC1815 Q203 2SC1815 R234 10K R234 10K R255 1K R255 1K C242 10n C242 10n R204 2.2K R204 2.2K HS206 70-010003-0 HS206 70-010003-0 3 2 1 411 + - IC203A TL084 + - IC203A TL084 C258 10n C258 10n R213 10 R213 10 R272 43K R272 43K R281 10K R281 10K + C235 1

35、0u + C235 10u R227 12K R227 12K R216 1K R216 1K R297 10K R297 10K R222 1K R222 1K R266 10K R266 10K + C209 10u + C209 10u R233 10K R233 10K D205 1N4148 D205 1N4148 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 P202A HEADER 8 P202A HEADER 8 Q218 KSC2690AYS Q218 KSC2690AYS + C217 47u + C217 47u R238 47 R238 47 R278

36、 3.3K R278 3.3K R28810KR28810K C246 2.2n C246 2.2n C252 2.2n C252 2.2n R205 100 R205 100 D212 5.1V D212 5.1V R232 10K R232 10K R240 47 R240 47 Q224 2SC1815 Q224 2SC1815 1 2 3 4 P207B 4P2.54-C P207B 4P2.54-C BUS204 COPPER STRIP BUS204 COPPER STRIP HS209 70-010002-0 HS209 70-010002-0 D217 4.3V D217 4.

37、3V C207 100n C207 100n R279 3.3K R279 3.3K D208 1N4148 D208 1N4148 D209 1N4148 D209 1N4148 + C218 47u + C218 47u Q209 2SA872 Q209 2SA872 Q223 2SC1815 Q223 2SC1815 R221 2K R221 2K 12 13 14 + - IC203D TL084 + - IC203D TL084 C278 100n C278 100n + C228 100u + C228 100u + C253 22000u + C253 22000u C230 4

38、7p C230 47p 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 P205B CON16A P205B CON16A + C203 470u + C203 470u R265 10K R265 10K R270 43K R270 43K 3 12 QT0330TPS08QT0330TPS08 R218 1.2K R218 1.2K +- BR203 DB104 +- BR203 DB104 C271 100n C271 100n F201 T1AL/250V F201 T1AL/250V Q204 2SA1015 Q204 2SA1015 R223 1K R

39、223 1K + C279 10u + C279 10u 3 12 QT0430TPS08QT0430TPS08 BUS206COPPER STRIPBUS206COPPER STRIP D207 1N4148 D207 1N4148 R245 1K R245 1K R219 220 R219 220 Q226 2SC1815 Q226 2SC1815 10 9 8 + - IC203C TL084 + - IC203C TL084 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 P203B HEADER 10 P203B HEADER 10 BUS202C

40、OPPER STRIPBUS202COPPER STRIP BUS201COPPER STRIPBUS201COPPER STRIP R214 1K R214 1K R203 2.2K R203 2.2K C249 2.2n C249 2.2n 3 12 QT0130TPS08QT0130TPS08 BUS203 COPPER STRIP BUS203 COPPER STRIP R28910KR28910K Q228 2SC1815 Q228 2SC1815 C212 10n C212 10n C256 10n C256 10n R235 1K R235 1K C277 100n C277 1

41、00n C237 100n C237 100n D219 4.3V D219 4.3V D203 1N4148 D203 1N4148 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 P204B CON16A P204B CON16A R248 1K R248 1K HS210 70-010002-0 HS210 70-010002-0 R208 1.5K R208 1.5K C276 100n C276 100n +- BR206 KBJ2506 +- BR206 KBJ2506 D211 N.I. D211 N.I. Q216 2SB647 Q216 2SB6

42、47 Q229 2SC1815 Q229 2SC1815 C257 100n C257 100n D218 4.3V D218 4.3V HS205 70-010003-0 HS205 70-010003-0 R252 100K R252 100K R217 220 R217 220 R261 10K R261 10K R28610KR28610K + C231 10u + C231 10u R256 10K R256 10K C236 100n C236 100n C201 10n C201 10n R276 3.3K R276 3.3K Q212 2SB647 Q212 2SB647 D2

43、01 1N4148 D201 1N4148 R212 100 R212 100 HS211 70-010003-0 HS211 70-010003-0 + C227 47u + C227 47u C211 10n C211 10n C244 2.2n C244 2.2n +- BR207 DB104 +- BR207 DB104 13 12 10 9 8 147 IC204A SN74HC21N IC204A SN74HC21N R243 10K R243 10K Q222 N.I. Q222 N.I. R29010KR29010K R296 10K R296 10K R274 100 R27

44、4 100 BUS205 COPPER STRIP BUS205 COPPER STRIP HS212 70-010003-0 HS212 70-010003-0 D210 N.I. D210 N.I. R271 43K R271 43K R298 10K R298 10K R215 1K R215 1K R247 47 R247 47 R267 10K R267 10K R242 10K R242 10K C273100nC273100n Q220 KSC2690AYS Q220 KSC2690AYS + C224 1000u + C224 1000u R246 1K R246 1K Q20

45、1 KSA1220AYS Q201 KSA1220AYS F204 T1.25AL/250V F204 T1.25AL/250V R28410KR28410K HS203 70-010003-0 HS203 70-010003-0 +- BR205 KBJ2506 +- BR205 KBJ2506 C234 47P C234 47P Q225 2SC1815 Q225 2SC1815 R251 1K R251 1K R249 47 R249 47 + C248 15000u + C248 15000u R220 10K R220 10K C210 10n C210 10n 1 1 2 2 3

46、3 4 4 5 5 P209B 5P3.96-C P209B 5P3.96-C 1 2 4 5 6 IC204B SN74HC21N IC204B SN74HC21N + C238 10u + C238 10u + C254 22000u + C254 22000u Q215 2SA1015 Q215 2SA1015 O 3 I 1 G 2 IC205 LM7805 IC205 LM7805 R230 1K R230 1K Q206 KSA1220AYS Q206 KSA1220AYS Q213 2SD667 Q213 2SD667 + C255 1500u + C255 1500u R262

47、 10K R262 10K D206 1N4007 D206 1N4007 C219 10n C219 10n R241 10K R241 10K + C239 10u + C239 10u R236 1K R236 1K R244 1K R244 1K Q202 KSC2690AYS Q202 KSC2690AYS C243 2.2n C243 2.2n R239 1K R239 1K R224 10 R224 10 C241 10n C241 10n R228 15K R228 15K HS204 70-010003-0 HS204 70-010003-0 5 6 7 + - IC203B

48、 TL084 + - IC203B TL084 R231 10K R231 10K F202 T1AL/250V F202 T1AL/250V R229 4.7K R229 4.7K R293 10K R293 10K R211 470 R211 470 R294 10K R294 10K 1 1 2 2 3 3 4 4 5 5 P208B 5P7.5-C P208B 5P7.5-C HS207 70-010002-0 HS207 70-010002-0 R277 3.3K R277 3.3K +- BR201 DB104 +- BR201 DB104 Q207 2SC1775 Q207 2S

49、C1775 Q230 2SC1815 Q230 2SC1815 HS208 70-010002-0 HS208 70-010002-0 C272 100n C272 100n R275 100 R275 100 + C202 470u + C202 470u R28710KR28710K R253 1K R253 1K HS214 70-010003-0 HS214 70-010003-0 C245 2.2n C245 2.2n + C213 3900u + C213 3900u + C226 10u + C226 10u Preliminar y 7V W505 ONLY FOR C VERSION 0V W503&W504 ONLY FOR AH VERSION ONLY USED FOR C VERSION ONLY USED FOR AH VERSION NEUTRAL LIVE P501B&P502B CONNECT TO EMC FITER MODULE TO POWER SWITCH BOARD FROM POWER SUPPLY BOARD FROM MAIN TRANSFORMER TO MAIN TRANSFORMER SCHEMATIC