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
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