Yamaha-XS250-pwr-sm(1) 维修电路原理图.pdf

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1、1.97K-9636 1.69K-545 Printed in Japan 99.1 CONTENTSSPECIFICATIONS . 3PANEL LAYOUT . 4DIMENSIONS .5BLOCK DIAGRAM . 5CIRCUIT BOARD LAYOUT & WIRING . 6DISASSEMBLY PROCEDURE . 7IC BLOCK DIAGRAM .10CIRCUIT BOARDS .11INSPECTIONS .13PARTS LISTSERVICE MANUALPOWER AMPLIFIERXS250/350PA011440RadioFans.CN 收音机爱

2、好者资料库2XS250/350IMPORTANT NOTICEThis manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed thatbasic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by theusers, and hav

3、e 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 components, and failure of the product to perform as specified. For these reasons, weadvise all Yamaha product owners t

4、hat all service required should be performed by an authorized Yamaha Retaileror the appointed service representative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification orrecognition of any applicable technical capabilities, or

5、 establish a principle-agent relationship of any form.The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, andservice departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inev

6、itable andchanges in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, pleasecontact the distributors Service Division.WARNING:Static discharges can destroy expensive components. Discharge any static electricity you body may haveacc

7、umulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.WARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of

8、this product contains LEAD. In addition, other electrical/electronic and /or plastic (where applicable)components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) tocause cancer and/or birth defects or other reproductive harm.DO NOT

9、 PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT-SOEVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes tosolder/flux vapor!If you come in contact with solder or components locate

10、d inside the enclosure of this product, wash your hands before handling food.RadioFans.CN 收音机爱 好者资料库3XS250/350General Specifications XS250,XS350Power Output Level (Rated Power)8 ohm/STEREO 20 Hz20 kHz4 ohm/STEREO THD+N= 0.1%8 ohm/BRIDGE 1 kHz 8 ohm/STEREO THD+N= 0.1%4 ohm/STEREO8 ohm/BRIDGE 1 kHz, 2

11、0 ms, no cilp2 ohm/STEREOPower Bandwidth Half Power Total Harmonic Distortion (THD+N) 48 ohm/STEREO 20 Hz-20 kHz, Half Power8 ohm/BRIDGE Frequency Responce8 ohm, Po= 1 WIntermodulation Distortion (IMD)48 ohm/STEREO 60 Hz: 7 kHz, 4:1, Half Power8 ohm/BRIDGEChannel SeparationHalf Power, RL = 8 ohm, Vo

12、l. max., input 600 ohm shuntResidual Noise Vol. min.12.7 kHz LPFIHF-A networkSN RatioDamping Factor8 ohm, f= 1 kHzSlew Rate STEREO 8 ohm full swingBRIDGESensitivity (Vol.max.) Rated Power into 8 ohmVoltage Ggin (Vol.max.)Input ImpedanceControlsFront PanelRear PanelConnectorsInputOutputIndicatorsPOWE

13、RPROTECTIONCLIPSLGNALProtection CircuitsPC limiterFan SpeedPower RequirementsUS & CanadaEuropeOtherPower ConsumptionIdling1/8 output power, 4 ohmMaximum output, 4 ohmDimentions (W x H x D)Weight170 W + 170 W250 W + 250 W500 W185 W + 185 W280 W + 280 W560 W400 W + 400 W10 Hz40 kHz (THD+N= 0.1%)230 W

14、+ 230 W350 W + 350 W700 W250 W + 250 W400 W + 400 W800 W600 W + 600 WPOWER switch (ON/OFF)Volume (31 position)x 2Mode switch (STEREO/BRIDGE/PARALLEL)Filter switch (OFF/SUBWOOFER/LOW CUT)x 2 (-12 dB/oct.)Freq. control (25 Hz125 Hz)x 2Barrier strip terminalXLR-3-31 type/chBarrier strip terminal5-way b

15、inding postsGreenx 2 (Red)x 2 (Red)x 2 (Green)POWER switch ON muting, DC detection,Temp. detection (heatsink temp / 90C)RL /65 dB, 20 Hz20 kHz/ -75 dB100 dB/100+/30 V/S+/40 V/S+1.7 dB +3.1 dB32.1 dB 32.1 dB30 k ohm/Balanced, 15 k ohm/Unbalanced0 dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rate

16、d Power)SPECIFICATIONSXS250XS3504XS250/350PANEL LAYOUTFront PanelRear PanelPOWERPOWERSIGNAL CLIPSIGNALCLIPPROTECTIONCH ACH BONOFFB-2 CHANNEL A-28-16 (BRIDGE)()(+)4-8/CHANNEL (STEREO)B-1 CHANNEL A-18-16 (BRIDGE)()+(+)4-8/CHANNEL (STEREO)(BRIDGE)(PARALLEL)(BRIDGE)(PARALLEL)FILTERCHANNEL BCHANNEL AFREQ

17、.FREQ.INPUTCHANNEL BCHANNEL AINPUTCHANNEL BCHANNEL ASPEAKERSGGMODECHANNEL BCHANNEL ASTEREOPARALLELBRIDGEOFFLOW CUTSUB WOOFEROFFLOW CUTSUB WOOFER201510630dB0040302590125150Hz255090125150Hz2550201510630dB00403025+1 POWER switch and indicator2 SIGNAL indicators3 CLIP indicators4 PROTECTION indicator1 F

18、requency controls/Filter select switches (CHAN-NEL A,B)2 Volume controls (CHANNEL A,B)3 STEREO/BRIDGE/PARALLEL switch4 SPEAKERS terminals5 INPUT terminals6 GND terminals12431235645XS250/350DIMENSIONSBLOCK DIAGRAMUnit: mmIC1023122772IC1015762772IC1046XS250/350PA7SUB 1/5SUB 2/5SUB 3/5SUB 4/5SUB 5/5CIR

19、CUIT BOARD LAYOUT & WIRINGTop ViewFront ViewSUB 4/5Wire colorXS350 OnlyPower Transformer 3NC2-V2940207XS250/3501.Top Cover1-1Remove the nine (9) screws marked 410. The top cover can then be removed. (Fig. 1, 2)2.Power Transformer2-1 Remove the top cover. (See Procedure 1.)2-2Remove the four (4) scre

20、ws marked 70. The power transformer can then be removed. (Fig. 1)5.Front Panel 5-1 Remove the top cover. (See Procedure 1.)5-2Remove the two (2) screws marked 380a and the two (2) screws marked 380b. The front panel can then be removed.(Fig. 3)6.SUB 3/5 Circuit Board6-1 Remove the top cover. (See Pr

21、ocedure 1.)6-2 Remove the front panel. (See Procedure 5.)6-3 Remove the two (2) screws marked 220. The SUB 3/5 circuit board can then be removed. (Fig. 3)1/52/53/54/53.SUB7 1/5 Circuit Board3-1 Remove the top cover. (See Procedure 1.)3-2 Remove the six (6) screws marked 80a. The SUB 1/5 circuit boar

22、d can then be removed. (Fig. 1)4.SUB 2/5 Circuit Board4-1 Remove the top cover. (See Procedure 1.)4-2 Remove the six (6) screws marked 50a and the two (2) screws marked 50b. The SUB 2/5 circuit board can then be removed. (Fig. 2, 7)7. SUB 4/5 Circuit Board7-1 Remove the top cover. (See Procedure 1.)

23、7-2 Remove the front panel. (See Procedure 5.)7-3 Remove the two (2) screws marked 200. The SUB 4/5 circuit board can then be removed. (Fig. 3)8. DC Fan8-1 Remove the top cover. (See Procedure 1.)8-2 Remove the front panel. (See Procedure 5.)8-3 Remove the four (4) screws marked 150. The DC fan can

24、then be removed. (Fig. 3)220: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) 380: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190) 70 480a 6410410410410410410Top coverPower Transformer410Rear panel380a380a380b380b50a50a50b(Fig. 1)(Fig. 2)(Fig. 3)200220150150Front panelDC Fan70: Bind Head Screw

25、 SP 5.0X10 MFZN2BL (VU688100) 80: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) 410: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190) 50a: Bind Head Screw A4.0X8 MFZN2BL (VP156800) 410: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190) DISASSEMBLY PROCEDURE8XS250/350PA760a:Bind Head Screw SP

26、 3.0X8 MFZN2Y (EG330290) 80b,c: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600) 10. PA7 Circuit Board10-1 Remove the top cover. (See Procedure 1.)10-2 Remove the front panel. (See Procedure 5.)10-3 Remove the PA7 unit. (See Procedure 9.)10-4Remove the sixteen (16) screws marked 80b; the four (4)

27、 screws marked 80c and the six (6) screws marked 60a. The PA7 circuit board can then be removed. (Fig. 6)9. PA7 Unit9-1 Remove the top cover. (See Procedure 1.)9-2 Remove the front panel. (See Procedure 5.)9-3 Remove the four (4) screws marked 250. The PA7 unit with the chassis can then be removed.

28、(Fig. 4)9-4 Remove the eight (8) screws marked 130. The PA7 unit can then be removed. (Fig. 5)130(Fig. 4)(Fig. 5)(Fig. 6)13013013060a 480c 480c 480b 480b 4250 4250: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)130: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190) Holder AHolder AIsolation sheet

29、 AIsolation sheet AHeat SinkFAN Angle9XS250/35011. Rear Assembly11-1 Remove the top cover. (See Procedure 1.)11-2 Remove the six (6) screws marked 270. The rear assembly can then be removed. (Fig. 7)12. SUB 5/5 Circuit Board12-1 Remove the top cover. (See Procedure 1.)12-2 Remove the rear assembly.

30、(See Procedure 11.)12-3Remove the four (4) screws marked 440 and the two (2) screws marked 50b and the two (2) screws marked 60b. The SUB 5/5 circuit board can then be removed. (Fig. 7)(Fig. 7)2/55/5440 2Cover, Speaker terminalRear panel440 250a 450a 270b 260b 250b 250a: Bind Head Screw A4.0X8 MFZN2

31、BL (VP156800) 50b: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300) 60b: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600) 70a: Bind Head Screw SP 5.0X10 MFZN2BL (VU688100) 70b: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) 440: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190) 270Rear assem

32、bly270270270270: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900) (Fig. 8)10XS250/350M5238AP (XM085A00)Operational Amplifier1234-V8765Output A+VNon-InvertingInput A-DC Voltage Supply+DC VoltageSupplyOutput BInvertingInput BNon-InvertingInput BInvertingInput A+-+-IC BLOCK DIAGRAMXS250/350XS250/350XS2

33、50/350SUB 1/5 Circuit BoardSUB 2/5 Circuit BoardSUB 3/5 Circuit BoardSUB 4/5 Circuit BoardSUB 5/5 Circuit BoardSX350SUB(U) :3NA-V290000 2SUB(H) :3NA-V290010 2Components sideComponents sideComponents sideComponents sideComponents sideCIRCUIT BOARDSfrom T101to SUB 2/5-CN103to PA-CN404from T101to SUB 1

34、/5-CN610to PA-CN201to PA-CN301from PA-W201to PA-CN406SX250SUB(U) :3NA-V289980 2SUB(H) :3NA-V289990 211XS250/350XS250/350XS250/350PA Circuit BoardSX3503NA-V2899600 1SX2503NA-V2899500 1Components sideto SUB 2/5-CN301to SUB 1/5-CN611from FANto SUB 3/5-CN501to SUB 2/5-CN1011213XS250/350A STEREO and PARA

35、LLEL OperationBefore performing any following adjustments, set the unit as follows:1.Set the ATTENUATIONS at the MAX.2.Input terminal:Cannon connector pin 2 is HOT, pins 1 and 3 GROUND.3.MODE switch:STEREO4.Output terminal:RL = 4 ohm/more than 500 W5.Others:Both Channel operation is required, if no

36、particular indication. Moreover, turn off the filter switch, if no particular indication.Adjustment Specifications1.Fan TestWhen turning on the power switch, confirm that both fans of right and left sides regulate at low speed. 2. Muting TestAfter applying power to the unit, the PROTECTION indicator

37、 should remain ON 2.5 +/-1 seconds to indicate that the protection circuitry is operating and the indicator should go out. NO signal is output while this indicator lit.3.Idle Current TestConnect the input terminal to the GROUND and adjust the VR201 (A channel) and VR301 (B channel) that the DC volta

38、ge Vb between the pin 1 and pin 2of the CN202 (A channel) and the CN302 (B channel) should be 1.0 +/-0.2 mV. And After finishing all tests, adjust the Vb again to 1.0 +/-0.2 mV.4.Input Terminal DC offsetConnect the input terminal to the GROUND and check that the DC voltage Vdc of the output terminal

39、 should be 0 +/-75 mV.5.Gain TestCheck that the OUTPUT should be +22.1 +/-0.5 dBu, when a sine wave of 1 kHz at -10 dBu is applied to the INPUT. This test should be performed on PARALLEL operation.6.Frequency Response TestFilter switch OFF:When a sine wave of 20 Hz, 1 kHz or 20 kHz at -10 dBu is app

40、lied to the INPUT, check that the output is 0 +/-0.5 dB at 20 Hz and -0.5 +/-0.5 dB at 20 kHz taking the 1 kHz as a reference.Filter switch SUB WOOFER:When a sine wave of 25 Hz, -10 dBu is applied to the INPUT, check that the output is -3.5 +/-1.0 dB taking the 1 kHz as a reference at the filter swi

41、tch OFF.When a sine wave of 150 Hz, -10 dBu is applied to the INPUT, check that the output is -3.5 +/-1.0 dB taking the 1 kHz as a reference at the filter switch OFF.Filter switch LOW CUT:When a sine wave of 25 Hz, -10 dBu is applied to the INPUT, check that the output is -4.5 +/-1.0 dB taking the 1

42、 kHz as a reference at the filter switch OFF.When a sine wave of 150 Hz, -10 dBu is applied to the INPUT, check that the output is -3.5 +/-1.0 dB taking the 1 kHz as a reference at the filter switch OFF.INSPECTIONS14XS250/3507.Harmonic Distortion TestWhen a high quality sine wave is applied at 20 Hz

43、, 1 kHz or 20 kHz, the harmonic distortion should be as follows: *This test should have been finished within 30 minutes.8. Channel Separation Test8-1 Apply a -5 dBu, 20kHz sine wave into the channel A.8-2 Short the input for the channel B with a 600 ohm load.8-3 Set the output of the channel A at a

44、reference of 0 dB.8-4 If channel B attenuator is set to the same as channel A, channel B output should be l ess than -65 dB. (RL = 8 ohm)9. Noise Test9-1 Set the input attenuator to MAX.9-2 Short the input with a 600 ohm load.9-3 Measure at the output, noise level should be less than -65 dBm.9-4 Set

45、 the input attenuator to , noise level should be less than -70 dBu.*Be careful that it is not affected by noise induced during this inspection.10. Stability TestWhen a rectangular wave 10 kHz, -10 dBu is applied to the input and a capacitor 10 pF0.47 F is connected with 4 ohm load resistor in parall

46、el, the overshoot and the ringing should be as follows. Oversshoot: Vp/Vo /= 1.8 Ringing: less than 5 wavesNext, when the 4 ohm load resistor is removed and the load is the capacitor 10pF0.47 F only, the overshoot and the ringing should be as follows. Oversshoot: Vp/Vo /= 2.5 Ringing: fade away in l

47、ess than 7 waves and no oscilation11. Protection Circuitry TestCheck that the relay does not work when you apply a sine wave of +5.0 dBu (XS350), +3.0 dBu (XS250) at 10 Hz to the input and adjust the input level to obtain a clipped output wave form.Next, check that when you apply a sine wave of 1 Hz

48、, 0.0 dBu to the input, the signal is cut off within 2 seconds, and the PROTECTION indicator should light up.Finally, check that when no signal is applied, the amplifier would resume to normal operation within 10 seconds.12. PC Limiter Circuitry TestCheck that the OUTPUT should be as follows with an

49、 oscilloscope when a sine wave of 0 dBu (XS350), -1.5 dBu (XS250) at 1 kHz is applied to the INPUT and the output is shorted with a 1 ohm load ( +/-5%). At this time, check the CLIP indicator lights.*This test should have been finished within 30 minutes.20 kHz350 W + 350 W (33.7 dBu/ch)250 W + 250 W

50、 (32.2 dBu/ch)Power output level (4 ohm)THD1 kHz20 kHz/= 0.1 %/= 0.1 %/= 0.1 %/= 0.1 %/= 0.1 %/= 0.1 %XS350XS250ModelOutput levelXS250XS350Vp-p /= 25VVp-p /= 20V15XS250/35013. Signal Indicator TestWhen a sine wave of 1 kHz, -23 dBu is applied to the input, SIGNAL indicator should light up.B BRIDGE O