YAMAHA mx-2000-sm 维修电路原理图.pdf

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1、ERE0 POWER AMPLIFIER CONTENTS f IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic service procedures inhennt to the industry, and more specifically Yamaha Products, are already known and understcad by

2、 the users, and have therefore not been restated. WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensive Eamponentr and failure of the product to perform as specified. For these reasons, we advise all Y

3、amaha product ownel rhat all sewib required should be performed by an authorized Yamaha Retailer or th appointed service representative. IMPORTANT: The presentation or sale of this manual to any individual or firm does not onstitute authorization, certification o r remgnitidn of any appllcaMe techni

4、cal aapabillties, or establish a principle-agent relationship of any form. The data provided is believed to be accurate and applicable to the unit(s) iddftxtted an the wver. The research, engineering, and service departments of Yamaha are continually striving to imptwe Yamaha products. Modifications

5、 are, therefore, inevitable and specifications are subjectt chaage wi&out notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors Servim Division. WARNING: Static discharges can destroy expensive components. Discharge any staticelectricity your body

6、may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires clncct to this buss). IMPORTANT: Turn the unit OFF during dsassembly and parts replacement. Recheck all work before you apply power to the unit. L - - - - TO SERVICE PERSONNEL . 1 ADJUSTMENTS . 4 FRONT

7、IREAR PANELS . 1 PRINTED CIRCUIT BOARD . 5 - 9 SPECIFICATIONS . 2 SCHEMATIC DIAGRAM . 10 BLOCK DIAGRAM . 2 WIRING. . 11 INTERNAL VIEW. . 3 PARTSLIST. . 12-20 DISASSEMBLY PROCEDURES . 4 YAMAHA CORPORATION PO.Box 1. Harnarnatsu. Japan 1.35K-604 liq Printed in Japan 88.8 I T 0 SERVICE PERSONNe 1. Criti

8、cal Componentr Information. Components having special characteristics are marked A and murt be replaced with parts having specifications equal to those originally installed. EQUIPMENT AC LEAKAGE TESTER 2. Leakage Current Measurement (Far 12OV Model Only). +UNDER TEST , JlvALENT , When service has be

9、en completed. it ir imperative that you verify that all exposed conductive surfaces are properly insulated from supply circuits. Meter impedance should be equivalent to 1500ohm shunted WALL by 0.151iF. OUTLET - - INSULATING TABLE - Leakage current murt not exceed 0.5mA. Be sure to test for leakagewi

10、th the AC plug in bath polarities. POLARIZATION This amplifier product is equipped with a polarized alternat- ing current line plug (a plug having one blade wider than the other ).This plug will fit into the power outlet only one way. This ia a safety feature. I FRONT/REAR PANELS SPECIFICATIONS Mlnl

11、mum RMS Output P o w par Chnnrl DIMENSION 20Hz -20kHz - 0.006% THO, 8 S 2 13W+ 130W - 0.005% THD, 651 16(IW+lSMN 18OW+180W io 0.01% THD, 4 n . Dynamic Pomr per Channel (by IHF Dqnmlc Hredrmom mesrurinO method) 8&2 180W 6n 2 4 w 4 n 34ow zn 4 9 w n m w Pomr Eand Width OM% THD, 65W. 8 0 1OHz -100kHr D

12、mpinq Factor _1 - loo0 - 1 kHz, 8 n - Iwut San$itiuihl/lmpedama MAIN IN 130W,8&2 1 2mV120kn Fm(uncy R.rpons 20Hz -2OkHz. MAIN IN +O, -0.3dB Total Harmonic DMonion IZOHz -ZOkHz) o : MAIN IN TO SP OUT, 1 3 0 , 8 n 0.005% -?! S i i l to Noise Ratio (IHF-A-Nwork) 3 MAIN IN (Shorted) 126dB RriduJ Noise (

13、IHF-A-Network) 1 5V Chonlrl Sopantion IkHz, Input Shorted, Vol. max. 96d6 Powor SUPMY ACIMV, WHz Powa Consumption 880W AC OvNR Un Swtched x 1 WOW max. P Dimwlon (W x H x D) 473 x 170 x 469mm - 1185/8x6-11/16 x 187/16l Unit: mm (inch) WaIglu 28kg I61 lbs 11 or) *moton: m u b b t m d m m without notic

14、e. I U I .- U . S . A . M o d a l I C I . D W m hl& B L O C K DIAGRAM P101,103.ID5.107 INPUT SP otr A N m PW LEVa METER PrnTECTlON *= M L T H ALP 0%-Zm UNSWITCHEO D301.302 .INTERNAL VIEW TOP VlEW BOTTOM VlEW 0 ELECTRICAL CAPACITOR: 22000pF 80V x 2 OINPUTCIRCUIT BOARD: VOLTAGE AMP SECTION 81 DIRECT E

15、RROR CORRECTION SECTION MAIN CIRCUITBOARD (Lch): H.C.A. POWER STAGE POWER TRANSFORMER U model : XE669001 C model : XE670001 MAIN CIRCUIT BOARD (Rch): H.C.A. POWER STAGE POWER SUPPLY CIRCUIT BOARD (2): OUTPUT COIL 81 OUTPUT ERROR POWER SUPPLY CIRCUIT BOARD (11: POWER SUPPLY SECTION (* B1.f BZandiB3)

16、&PROTECTION CIRCUITSECTION METER CIRCUIT BOARD (1) DISASSEMBLY PROCEDURES (Remove parts in disassembly order a s numbered.) 1. Removal of Top Cover Assy - Remove 11 screws ( ) in Fig. 1. 2. Removal of Bottom Cover Remove 24 screws ( ) in Fig. 1. 3. Removal of Wood Panel Assy Remove 8 screws ( ) in F

17、ig. 1. 4. Removal of Front Panel Remove 4 screws ( ) and plastic rivet ( ) in Fig. 1. - 8 Q Fig. 1 - ADJUSTMENTS Idling Adjustment 1) Remove the wood panel assembly. 2) Adjust VR201 (both L and R) so that the voltage between test pins TP1 and TP2 in the main circuit board becomes DCGOmV + 590mV. Mai

18、n Circuit Board I VR201 TPl TP2 , = Meter Adj Connect a . ,. . . ,. ustment 8.9 dumm -.- ,. 1) y load. 2) Aalusr vnrud IL ch) and VR404 (R ch) so that meter indicator reads O W with no signal applied. 3) Apply 1kHz sine wave signal to INPUT and set the signal level so that 28.3Vrms voltage is obtain

19、ed at both ends of the dummy load. 4) Adjust VR401 (L ch) and VR402 (R ch) so that the meter indicator reads 1OOW. 5) eter indicator reads O W with no iust again if necessary. Recheck t signal appl hat the m ied and adj lvlerer Circuit Board 1 .PRINTED CIRCUIT BOARD (Pattern side) Note) ZTEi : Compo

20、nent ride I Main Circuit Board 1 (L channel is the same as R channel) FROM :POWER SUPPLY I I ) TO : POWER SUPPLY ( I) TO : POWER SUPPLY ( I) a TO :POWER SUPPLY (2 %WER SUPPLY (1 1 .: FROM : POWER SUPPLY (1 1 METER Lch J ER SUPPLY (31 PROTECTION POWER SPEAKERS OFF - C FR0M:PQWER SUPPLY (1)- L Meter C

21、ircuit Board (2) L 1 - 2 - 5 - 4 A 5 A 6 A IW-1000 l PRINTED CIRCUIT BOARD(Pattern side) Notal Z T E S : Component side FROM : POWER SU Meter Circuit Board I Power Supply Circuit Board (3) 1 FROM : METER ( I ) Opention Check of Input Circuit Bbafd Alone Connect IN and E of board-in going to R channe

22、l main circuit board of the input circuit board and IN and E of board-in going to L channel one to sockets R, RE, LE and L which receive board-in of the power circuit board (2) with wires. Connect iaOV power source to +82, E and -82 of board-in going to the power supply circuit board L1 I I Input Ci

23、rcuit Board and then wnnect EM terminal to -82 with 47k.Q. 1 ,. -. resistance included. ! TO : MAIN R 13% - C 0 K 6 9 6 C D m - 2 0 a 0 WIRING 150mA 8 V x 6 METER (I I POWER SUPPLY ( 1 ) POWER SUPPLY (2) -2000 LIST I ELECTRICAL PARTS =WARNING Components having special characteristics are marked and

24、must be replaced with Parts having specifications equal to those originally installed. *Carbon resistors Il/BW or 1/4W) are not included in the ELECT PARTS list. For the parts No. of the carbon resistor, refer to p. 20. E E XNew Parts (%a) NR *New Parts (%I&$&) NR %New Parts (M%BI$) NR i I L * i L i N s w Parts (RfLlbb) NR IMECHANI SM PARTS NO-, 9 : Diameter I EXPLODED VIEW Tighten this scraw.securely as it grounds the circuit the chartis. I Part No. 1 k,. 41 1 Fi 38 j 41 jOO(Ceramic Cap. 0.0lpF t52i 42 / CB i 60 i 08 i 10 1 Cover %!New Parts (%R%&) NR Parts List for Carbon Resistor