NAD-C375BEE-int-sm维修电路原理图.pdf

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1、LAUNAMECIVRES LAUNAMECIVRES C375BEE C/AH ? NAD 2010 NAD ELECTRONICS INTERNATIONAL TORONTO C375BEEHA/C STEREO INTEGRATED AMPLIFIER C375BEEHA/C STEREO INTEGRATED AMPLIFIER STEREO INTEGRATED AMPLIFIER RadioFans.CN 收音机爱 好者资料库 CONTENTS FRONT PANEL/REAR PANEL VIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

2、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?3 SPECIFICATIONS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 4 ALIGNMENT PROCEDURE/ALIGNMENT POINTS? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 5-7 WIRING DIAG

3、RAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?8 SCHEMATIC DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?9-18 PCB LAYOUT? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

4、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 19-27 ELECTRICAL PARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?28-48 EXPLODED VIEW? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

5、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 49 EXPLODED VIEW PARTS LIST? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?50 PACKING DIAGRAM? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

6、? 51 VERSION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 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 NUMB

7、ER DESCRIPTION Rear Panel AH A20-12103-00 Littelfuse618 T10AL/250V C A20-12702-20 Littelfuse618 T5AL/250V STANDBY Board F401 A20-12102-00 Littelfuse618 T1AL/250V NOTE: *AH : North American version only *C : European version only 2. Safety-check out (North American model only) Before returning the pr

8、oduct 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. -

9、2 - RadioFans.CN 收音机爱 好者资料库 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?module ? non-service-part ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? - 3 - RadioFans.CN 收音机爱 好者资料库 PREAMPLIFIERS SECTION THD(2V in 2V out,CCIF IMD,DIM 100) 102

10、dB S/N re 2V output, max volume 110 dB S/N re 100mV o/p (unity gain) 92 dB Channel separation 1KHz 80 dB 10KHz 70 dB Input impedance 100kohms+320pF Max input, 0.1% thd 8 V rms Output impedance pre out 75 ohms Output impedance variable out 325 ohms Output impedance tape out source Z + 1k ohms Input s

11、ensitivity for 500mV out 158 mV Frequency response 20-20k tone defeat on +/- 0.1dB tone defeat off 10 V Max output 600 ohm,s load 10V Tone controls Bass at 100Hz +/- 8 dB Treble at 10KHz +/- 5dB POWER AMPLIFIERS SECTION Continuous average power , stereo,8 and 4 ohms at rated thd ,20-20k 150W Continu

12、ous average power 8 ohms , bridge mode 330W Rated thd, 20-20k, SMPTE and CCIF IMD, DIM 100 170W IHF dynamic power 8 ohms 250W IHF dynamic power 4 ohms 410W IHF dynamic power 2 ohms 600W IHF dynamic power 8 ohms(Bridge Mode) 800W IHF dynamic power 4 ohms(Bridge Mode) 1200W Peak output current 1msec,

13、1 ohm 50A S/N A wtd re 1 W 102 dB S/N A Wtd re 150W 123 dB Damping factor ( re 8 ohms, 50 Hz and 1kHz) 200 Frequency response 20-20k 85 dB 10kHz 75 dB Trigger out Output resistance 120 ohms Output current 50mA Output voltage +12V OVERALL CD In Speaker Out THD 20-20k, CCIF IMD, DIM 100 , 0.25W to rat

14、ed power 94dB S/N A wtd re 150W ( volume set for 2V input) 113 dB Frequency response 20-20k Tone defeat in 80 dB 10KHz 70 dB Rated power ( 230 or 120 V AC 50.60 Hz) 290 W Standby power 1W Idle power 120W Net weight 15.3 kg Shipping weight 18 kg Dimensions 435x133x352 mm - 4 - SPECIFICATIONS RadioFan

15、s.CN 收音机爱 好者资料库 A. DC OFFSET VOLTAGE The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-20mV. B. IDLING CURRENT The idling current in the output stage of the poweramp should be set to 30mA+/-5mA per pnp-npn transistor pair (This means the mid point voltage is 6.6mV with down limit o

16、f 5.5mV and up limit of 7.7mV). The alignment procedure is: At first, adjust RV102 (Marked as “Idling Current ADJ” in the drawing page 6) for a voltage of 6.6mV +/- 1mV between Test point 1 and 2. Then preheat the unit for 1 minutes, let idling current settled and then readjust to 6.6mV +/- 1mV. Thi

17、s is a no-load adjustment. Pls note: Though the idling current is set as 6.6mV +/-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, it

18、s acceptable as long as the voltage is in the range of 5.5mV7.7mV. C. 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 RV103 (as marked as “ISC SENS ADJ” in the drawing page 6) to ge

19、t a voltage between the “ISC SENSE TEST POINT” and AGND to be 0mV+/-10mV. D. MINIMUM VOLUME LEAKAGE CANCELLATION The volume control, 20k potentiometer has a finite end stop resistance, variable and about 7 ohms max, so at minimum volume there is some signal leakage to pre out, appearing 29 dB higher

20、 at poweramp out. The cancellation circuit applies a fraction of the signal to the negative input of the line out amp to cancel this leakage. The alignment procedure is: feed 1KHz/2V signal in CD. Set volume for 10V speaker out as 0 dB reference. Then set vol to minimum. Adjust RV307 (Marked as “LEF

21、T MIN. LEAKAGE ADJ” in the drawing page 7) for a minimum at left speaker out, the reading should be -86 dB, or 0.5mV. Adjust RV308 (Marked as “RIGHT MIN. LEAKAGE ADJ” in the drawing page 7) for a voltage minimum at right preout, the reading should be -86 dB or 0.5 mV. E. FREQUENCY RESPONSE The frequ

22、ency response should be set to 0+/-0.3dB. The alignment procedure is: Disable tone defaet first, feed 1KHz/2V to CD, Adjust Preout to 500mV as 0dB reference level. Change to 20Hz and set RV305 (Marked as “LEFT FREQUENCY RESPONSE ADJ” in the drawing on page 7) to within +/-0.1dB. Then repeate the abo

23、ve for the RHC, adjust RV306 (Marked as RIGHT FREQUENCY RESPONSE ADJ” in the drawing below) to within +/-0.1dB. - 5 - ALIGNMENT PROCEDURE RadioFans.CN 收音机爱 好者资料库 ? ? ? ? ? ? ? ? ? - 6 - ALIGNMENT PROCEDURERadioFans.CN 收音机爱 好者资料库 ? ? ? ? ? ? ?! ?# - 7 - ALIGNMENT PROCEDURE RadioFans.CN 收音机爱 好者资料库 P30

24、0 LEFT POWERAMP BOARD RIGHT POWERAMP BOARD TO P201B PAD6 PAD5PAD2PAD3PAD4PAD1 P401 P402 FROM PAD1-6 FROM P203AFROM P211A FROM P209A TO LEFT P101B TO LEFT P103B TO P901B TO L&R P102B FROM P504A FROM P503A TO P205BTO P302BFROM P501A TO P402B FROM P502A FROM XFORMER FROM XFORMER FROM XFORMER FROM XFORM

25、ER FROM P301A TO P202BTO STAR GND TO P208B FROM P801A FROM REAR PANEL L&N TO P204B FROM P701A FROM P300 TO RIGHT P103B TO RIGHT P101B FROM P212A FROM P210A FROM P203A MAIN BOARD BINDING POST BOARD RS232 BOARD HEADPHONE BOARDSTANDBY BOARD DISPLAY BOARD TONE BOARD TO EXTEND MODULE P404BP404B AC INLETA

26、C INLET 12 J701J701 P212AP212A P504AP504A P103BP103B P203AP203A P205BP205B P801AP801A P209AP209A POWER SWITCHPOWER SWITCH 12 P210AP210A P102BP102B J402J402 P502AP502A P211AP211A P206BP206B P501AP501A G2G1G2G1 P402BP402B P302BP302B P101BP101B P901BP901B P202BP202B P301AP301A AC OUTLETAC OUTLET P208BP

27、208B P103BP103B P213BP213B P701AP701A P207BP207B P503AP503A P101BP101B P102BP102B J401J401 P403BP403B P201BP201B P204BP204B P214BP214B - 8 - WIRING DIAGRAM FROM XFORMER (MDC 8.8V VERSION) P217B RadioFans.CN 收音机爱 好者资料库 ISC BIRIDGE SCN/MUTE GND OUT IN PROTECT FB TP2 SCP O/P -15V VCC +80V VSS VCC -80V

28、+15V -15V -15V VCC +15V +15V -15V +15V +80V -80V 1 1 1 /5W/5W/5W/5W TO MAIN BOARD /1% /1KV /100V /1W /1/4W /100V /1W/1% /1W/1% /1W/1% /1% /1/2W /1% /1W/1% DC SERVO /100V /3W /1W /1% /1KV TO MAIN BOARD All Polyester capacitors are 63V 10% unless noted. All Elec. capacitors are 50V 20% unless noted. A

29、ll Resistor are 1/6W 5% RJ13 unless noted. All Zener diode are 1/2W unless noted. ISC COMPARATOR /3W /3W /1% /1KV /1KV /1KV /25V /25V /1/2W MPSA42 MPSA92 bce MPSA06 MPSA56 2SA2121 2SC5949 KSA1220A KSC2690A bce bce bc /1/4W e /1/4W /1/4W 2SA1013 /1/4W /1/4W 2SC2383 /1/2W /100V /1KV /1KV /5W /1KV /1%

30、/1/4W /1% /3W /1% TO MAIN BOARD cbe /1/2W /5W /1/4W /1/2W /250V /1% /3W 2SA970 2SA1015 2SC1815 2SC2240 TEST POINT /5W /1KV /1/4W /100V /1% /100V /1KV /1% /250V /5W /100V /100V /1KV /1KV Q152 mount to main heatsink /2W /1% /1% /1% /1% C138 220pF C138 220pF D116 1N4148 D116 1N4148 C151 100nF C151 100n

31、F R139 36K R139 36K R195 100 R195 100 P102B 5PIN2.54-C P102B 5PIN2.54-C 1 2 3 4 5 R172 0.22 R172 0.22 R194 10 R194 10 + C107 10uF + C107 10uF D122 N.I. D122 N.I. R186 22K R186 22K R1G3 1K R1G3 1K R1E4 100 R1E4 100 R191 100 R191 100 C112 47pF C112 47pF R199 220 R199 220 Q144 2SC5949 Q144 2SC5949 R107

32、 100 R107 100 Q111 2SA970 Q111 2SA970 R120 82 R120 82 C122 22pF C122 22pF C102 100nF C102 100nF R103 549 R103 549 + C157 47uF + C157 47uF R116 24K R116 24K R173 0.22 R173 0.22 Q136 KSC2690A Q136 KSC2690A R135 2.2K R135 2.2K D117 1N4148 D117 1N4148 R154 1.2K R154 1.2K R162 33 R162 33 R112 39K R112 39

33、K D103 1N4148 D103 1N4148 + C130 47uF + C130 47uF R1A6 100K R1A6 100K C155 100nF C155 100nF C123 22pF C123 22pF +C143 10uF +C143 10uF D114 1N4148 D114 1N4148 D130 1N4148 D130 1N4148 R183 47K R183 47K R1A1 24.3K R1A1 24.3K Q105 2SA1015 Q105 2SA1015 D127 1N4148 D127 1N4148 Q133 KSC2690A Q133 KSC2690A

34、R160 100 R160 100 R169 1 R169 1 R114 82 R114 82 C135 100nF C135 100nF CW RV103 10K CW RV103 10K 13 2 R132 2.2K R132 2.2K Q141 2SA2121 Q141 2SA2121 C127 100nF C127 100nF R1F6 4.7meg R1F6 4.7meg R141 3.9K R141 3.9K Q148 2SC2240 Q148 2SC2240 R129 10 R129 10 R119 39K R119 39K D107 1N4148 D107 1N4148 R1E

35、2 1meg R1E2 1meg R159 1K R159 1K R128 10 R128 10 R127 10 R127 10 C134 470pF C134 470pF Q119 2SA1013 Q119 2SA1013 C124 430pF C124 430pF P103B 5PIN3.96-C P103B 5PIN3.96-C 1 2 4 5 3 R193 100 R193 100 Q102 2SA970 Q102 2SA970 R1G5 1meg R1G5 1meg Q104 2SC2878 Q104 2SC2878 + C141 4.7uF + C141 4.7uF R150 10

36、K R150 10K G1G1 N.I. G1G1 N.I. 1 Q112 2SC2240 Q112 2SC2240 + - IC104B TL084CN + - IC104B TL084CN 5 6 7 R148 10K R148 10K R1E9 330K R1E9 330K + C105 10uF + C105 10uF R181 0.22 R181 0.22 Q103 2SC2240 Q103 2SC2240 Q131 KSA1220A Q131 KSA1220A D115 1N4148 D115 1N4148 Q135 KSC2690A Q135 KSC2690A R122 100K

37、 R122 100K Q101 KSC2690A Q101 KSC2690A R151 10K R151 10K R1F1 22K R1F1 22K + - IC104A TL084CN + - IC104A TL084CN 3 2 1 411 C142 100nF C142 100nF R117 15 R117 15 Q116 2SA970 Q116 2SA970 R138 10K R138 10K CW RV102 500 CW RV102 500 13 2 Q138 KSA1220A Q138 KSA1220A R196 100K R196 100K R188 33K R188 33K

38、+ C108 10uF + C108 10uF Q149 MPSA92 Q149 MPSA92 R1F5 270K R1F5 270K Q121 2SC1815 Q121 2SC1815 R155 4.7 R155 4.7 D105 1N4148 D105 1N4148 R1A8 220 R1A8 220 Q129 2SA970 Q129 2SA970 Q147 MPSA92 Q147 MPSA92 R189 22K R189 22K Q139 2SA2121 Q139 2SA2121 R124 100K R124 100K R1F2 10K R1F2 10K Q132 KSC2690A Q1

39、32 KSC2690A C116 33pF C116 33pF R176 10K R176 10K R165 1 R165 1 R167 22 R167 22 + C125 10uF + C125 10uF + - IC104D TL084CN + - IC104D TL084CN 12 13 14 R102 10K R102 10K +C146 10uF +C146 10uF D124 N.I. D124 N.I. CB101 ST-22 90C L TYPE CB101 ST-22 90C L TYPE 12 +C145 10uF +C145 10uF R144 3.3 R144 3.3

40、+ C103 10uF + C103 10uF D111 18V D111 18V + C150 10uF + C150 10uF R161 4.7 R161 4.7 Q117 2SC2240 Q117 2SC2240 R1A4 10 R1A4 10 R133 2.7K R133 2.7K R1E1 24.3K R1E1 24.3K + - IC104C TL084CN + - IC104C TL084CN 10 9 8 R158 910 R158 910 P104A 5PIN2.54-C P104A 5PIN2.54-C 1 3 2 4 5 C154 100nF C154 100nF R1H

41、3 1K R1H3 1K R1E5 100 R1E5 100 +C115 10uF +C115 10uF R198 1K R198 1K Q150 MPSA92 Q150 MPSA92 R105 100 R105 100 C110 100nF C110 100nF R130 1K R130 1K Q130 2SC2240 Q130 2SC2240 D109 BAV21 D109 BAV21 IC101 TL431 IC101 TL431 23 1 + C118 10uF + C118 10uF D121 N.I. D121 N.I. R179 0.22 R179 0.22 R111 100 R

42、111 100 Q115 2SA970 Q115 2SA970 R164 18 R164 18 D106 1N4148 D106 1N4148 C139 100nF C139 100nF R184 470 R184 470 Q120 2SC2383 Q120 2SC2383 R1E3 0.05 R1E3 0.05 C144 100nF C144 100nF Q137 KSA1220A Q137 KSA1220A CB102 ST-22 80C L TYPE CB102 ST-22 80C L TYPE 12 Q106 2SC2878 Q106 2SC2878 + C109 10uF + C109 10uF C128 100nF C128 100nF P101B 11PIN2.54-C P101B 11PIN2.54-C 1 2 3 4 5 6 7 8 9 10 11 R1A2 7.32K R1A2 7.32K R1A9 7.32K R1