NAD-C320BEE-int-sm维修电路原理图.pdf

NAD SERVICE MANUAL C 320BEE STEREO AMPLIFIER C 320BEE STEREO AMPLIFIER RadioFans.CN 收音机爱 好者资料库 PRODUCT SAFETY SERVICING GUIDELINES CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY. NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURERS APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM AC LINE SHOCK. SAFETY CHECKS AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED. A CHECK SHOULD BE MADE OF THE FOLLOWING. SUBJECT : FIRE CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD, 150V AC TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE AC VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE AC PLUG AND REPEAT AC VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURE MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP AC ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT : GRAPHIC SYMBOLS SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC. 3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCAL MOUNTING KIT MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.S OF THE SAME OR LARGER SCREEN SIZE. 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY. THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL, WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” WITHIN THE PRODUCTS ENCLOSURE THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND MAINTENANCE (SERVICING) INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE APPLIANCE. RadioFans.CN 收音机爱 好者资料库 SERVICING PRECAUTIONS CAUTION : Before servicing the A/V Receiver covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publication, always follow the safety precautions. Remember Safety First: General Servicing Precautions 1. Always unplug the A/V Receiver AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnecting or reconnecting any internal electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an electrolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this A/V Receiver or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cottontipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required. 4. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped. 5. Do not apply AC power to this A/V Receiver and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. 6. Always connect test instrument ground lead to the appropriate ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1M-ohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical Es devices are integrated circuits and some field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an antistatic solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices. 5. Do not use freonpropelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material). 7. lmmediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handing unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.) RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS POWER AMPLIFIER SECTION STEREO MODE CONTINUOUS AVERAGE POWER 50 W (17 dBW) OUTPUT INTO 8 OHMS OR 4 OHMS (Min. power per channel, 20 Hz 20 kHz, with no more than rated distortion) Rated Distortion 0.03% (THD 20 Hz 20 kHz) Clipping power 68 W (maximum continuous power per channel 4 and 8). IHF dynamic headroom: at 8 ohms + 3.4 dB at 4 ohms + 5.0 dB IHF dynamic power (maximum short term power per channel) 8 ohms: 110 W (20.4 dBW) 4 ohms: 160 W (22.0 dBW) 2 ohms: 210 W (23.2 dBW) Damping factor 180 (ref. 8 ohms 1 kHz) Input Impedance R = 20 kohms C = 470 pF Input sensitivity (for rated output into 8 ohms) 630 mV Voltage gain 29 dB Frequency response 20 Hz 20 kHz 0.2 dB Signal / Noise ratio, A-weighted 100 dB ref. 1 W 117 dB ref. 50 W THD + Noise < 0.03% (Total Harmonic Distortion, 20 Hz 20 kHz, from 250 mW to rated output) SMPTE I.M. < 0.01% (Intermodulation Distortion, 60 Hz + 7 kHz, 4:1, from 250 mW to rated output) IHF I.M. < 0.01% (CCIF IM Distortion, 19 + 20 kHz at rated output) Headphones Output Impedance 220 ohms RadioFans.CN 收音机爱 好者资料库 PREAMPLIFIER SECTION LINE LEVEL INPUTS (Disk, CD, Video, Auxiliary, Tuner, Tape 1,Tape 2) Input impedance (R and C) 200 kohms + 320 pF Input sensitivity (ref. rated power) 220 mV Maximum input signal 6 V Signal / Noise ratio, A-weighted 93.0 dB ref. 1W (from CD Input to Speakers Output, Volume Setting for 500mV in , 8ohms 1W out) Signal to noise ratio preamp out, IHF “A” weighted 106 dB re 500mV Frequency response, 20 Hz 20 kHz < +/-0.1 dB (tone defeat on) < +/-0.5 dB (tone defeat off) THD + Noise, SMPTE IM 12 V Tape-out : 10 V CONTROLS Treble +/- 5 dB at 10 kHz Bass +/- 8 dB at 100 Hz IR IN and OUT Input Resistance 10 kohms Input Voltage Min 5 V Output Resistance < 30 ohms TRIGGER Out Output Current 50 mA Output Voltage 12 V DIMENSIONS AND WEIGHTS Net Weight 6.5 kg ( 14.3 Ib) Shipping Weight 8 kg ( 17.6 Ib) DIMENSION (WHD) 435 100 290MM RadioFans.CN 收音机爱 好者资料库 ALIGNMENT PROCEDURES I. INITIAL ADJUSTMENT (No load connected) A. OUTPUT OFFSET VOLTAGE 1. Connect a DC Millivoltmeter to L Channel speaker output terminals. 2. Turn unit ON and adjust VR21 (100 ohms) to get the reading of 0V+/-30mV. 3. Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust VR11 (100ohms) to get a reading of 0V+/-30mV. B. IDLING CURRENT 1. Connect a DC Millivoltmeter to TP1 and TP2 and adjust VR22 (300 ohms) for 3-5mV reading on meter. 2. Connect the DC Millivoltmeter to TP3 and TP4 and adjust VR12 (300 ohms) for 3-5mV reading on meter. 3. Leave power on for a minimum of 5 minutes. II. FINAL ADJUSTMENT Repeat procedure A and B for offset voltage and idling current alignment respectively. VR22 VR21 VR11 VR12 TP1 TP2 TP3 TP4 RadioFans.CN 收音机爱 好者资料库 Preliminar y JK41 1 2 3 4 5 CZ44 PHONES SOCKET N8C320D03 AC POWER CORD C435 4n7/400V SW42 POWER SWITCH T401 1 2 3 CZ411 RED GRY BLK ORG VIO ! ! ! C41 10n/250V D41 KBU8D C42 10n/250V D45 KBU8D C417 15000uF/50V 10% C418 15000uF/50V 10% Q418 C1815 Q417 A1015 D431 TIC116D D432 TIC116D R458 1K R463 22K R461 100 R462 1K R460 1K R459 1K R465 100 R464 22K R431 0.05/3W 5% CE R432 220 Q410 A1015 Q49 A1015 R434 2K2 R433 2M2 Q419 A1015 Q420 C1815 R466 4K7 D413 1N4002 R444 22K C423 3300u/50V C424 2200u/50V 1 2 3 4 CZ48 1 2 3 4 5 6 7 CZ46 D426 1N4002 D424 1N4002 D427 1N4002 D425 1N4002 1 2 3 CB410 ! ! ! ! ! C5 10n TO CHASSIS F41 F42 F44 F43 ! ! ! ! ! ! H1 H2 L1 L2 G GND GND +46V -46V -37V +37V I-V AC DET. TRIG NAD C320 RECTIFIERS CIR. 10% 10% R12/2 22K C4 10n O/P RELAY L OUT R OUT D412 1N4148 BINDING POSTS R446 56K R445 56K C422 330u/16V C421 4u7/50V C432 0.22u R443 150 1/2W FS R441 15K R442 56KC420 100u/16V PROTECTION CIR. 0V 0V +3.25V +2.16V 0V 0V +2.0V +18V +46V R478 100K 1 2 3 IC43A TL082D R480 6K2 R482 4K7 R479 100K C428 10u/25V C425 10u/25V R470 10K R471 10K D418 1N4148 D417 1N4148 R477 47K R483 330K R473 47K R472 470K C426 10u/25V C429 10u/25V R488 39K R487 39K D420 1N4148 D419 1N4148 R486 560K R4741K C430 10u/25V R476 1K C431 10u/25V R490 100K R491 100K 4 5 6 7 8 IC43B TL082D +18V +18V-18V 1 2 3 4 5 6 7 CB47 5PIN -37V+37V 1 2 3 4 CB49 4PIN -46V+46V 1 2 3 4 5 CB45 5PIN R453 220/2W FP R452 220/2W FP R438 22K R439 T0=90 degree C Q412 C1815 POSISTOR +18V R45 33/0.5W FS R41 680 R43 680 R47 680 C43 220u/50V C413 220u/35V Q41 2SD669A C45 22p R49 680 R411 680 R413 680 D49 18V C47 47u/25V C49 47u/25V R414 2K2 R46 33 / 0.5W FS R42 680 R44 680 R48 680 C44 220u/50V C414 220u/35V Q43 C1815 C46 22p R410 680 C48 10u/25V C410 47u/25V R412 2K Q42 2SB649A Q44 A1015 C411 0.1u 10% C412 0.1u 10% R428 2K2 R429 5K1 MF MF -37V +37V NAD C320 SUPPLY CIR. 63V 63V +18V -18V Q411 A1015 R436 56K R435 100K R489 100K R457 220K R451 330K D423 1N4148 R448 100K C434 22n/63V R427 22/1W FP Q413 D669 Q414 C1815 +37V +12V +18V +12V Protection Soft Ind +5.6V +18V -18V+5.6V +18V -18V +12V Remote Mute Pre Mute 5.6V Standby STANDBY R11 470 C11 10u/16V R15 22K R14 100 Q12 A970 Q13 C2240 C12 470p R19 39K R111 82 R112 82 R110 39k C14 10u/35V C13 10u/35V Q14 C2240 Q15 A970 R115 33 R116 33 Q16 A1015 Q17 C1815 R119 47 R120 82 C18 22p C19 22p C15 220uF/63V C16 220uF/63V Q110 B649 Q111 D669 R124 3.3/0.5W FP R125 3.3/0.5W FP R128 330/0.5W FP R129 330/0.5W FP R123 47K C110 47u/25V C111 47u/25V R126 2K7/2W FP R127 2K7/2W R130 82/1W R131 82/1W R142 22 R143 22 R136 10 R137 10 Q112 D669 Q115 2SC5200 Q114 2SA1943 Q113 B649 R144 0.068/3W CE R145 0.068/3W CE R139 470 VR12 300 R153 1K2/2W 5% FP R149 150/1/4W 1% MF C1162200u/6.3V C117 0.1u 10% 63V L11 1uH R150 1/1W R151 10/1W FS C118 0.1u 10% 63V C119 22n 10% 63V C115 0.1u 10% 63V C114 0.1u 10% Q19 D667 Q18 B647 D13 1N4148 D15 1N4148 D14 1N4148 D16 1N4148 R121 100K R122 100K R21 470 C21 10u/16V R25 22K R24 100 Q22 A970 Q23 C2240 C22 470p R29 39k R211 82 R212 82 R210 39k C24 10u/35V C23 10u/35V Q24 C2240 Q25 A970 R215 33 R216 33 R203 82 Q26 A1015 Q27 C1815 R219 47 R220 82 C28 22p C29 22p C25 220uF/63V C26 220uF/63V Q210 B649 Q211 D669 R224 3.3/0.5W FP R225 3.3/0.5W R228 330/0.5W FP R229 330/0.5W R223 47K C210 47u/25V C211 47u/25V R226 2K7/2W R227 2K7/2W R230 82/1W R231 82/1W R242 22 R243 22 R236 10 R237 10 Q212 D669 Q215 2SC5200 Q214 2SA1943 Q213 B649 R244 0.068/3W CE R245 0.068/3W CE R239 470 VR22 300 R253 1K2/2W 5% FP R249 150 1/4 1% MF C2162200u/6.3V C217 0.1u 10% 63V L211uH R250 1/1W FP R251 10/1W FS C218 0.1u 10% C219 22n 10% C215 0.1u 10% C214 0.1u 10% TP1 Q29 D667 Q28 B647 D23 1N4148 D25 1N4148 D24 1N4148 D26 1N4148 R221 100K R222 100K R12 220K R22 220K C212 470p C213 470p C112 470p C113 470p R147 1K Q11 C1815 Q12/1 A1015 R152 22K R12/1 6K8 R148 15K C120 22n 10% D17 1N4148 R247 1K R248 15K R252 22K Q21 C1815 C22