Yamaha-XH150-pwr-sm(1) 维修电路原理图.pdf

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1、 CONTENTSSPECIFICATIONS 3/4PANEL LAYOUT 5DIMENSIONS 6BLOCK DIAGRAM 6CIRCUIT BOARD LAYOUT & WRING 7DISASSEMBLY PROCEDURE 8IC BLOCK DIAGRAM 12CIRCUIT BOARDS 13INSPECTIONS 15/17PARTS LIST1.97K-9636 1.92K-173 Printed in Japan 99.2SERVICE MANUALPOWER AMPLIFIERXH150PA01144119990210-140000RadioFans.CN 收音机爱

2、 好者资料库2XH150IMPORTANT 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 have t

3、herefore 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 that

4、 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 es

5、tablish 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, inevita

6、ble 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 your body may haveaccum

7、ulated 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 th

8、is 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 P

9、LACE 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 located

10、inside the enclosure of this product, wash your hands before handling food.RadioFans.CN 收音机爱 好者资料库3XH150General SpecificationsPower Output Level 20 Hz-20 kHz THD+N= 0.1 %Power BandwidthHalfpowerTHD+N 20 Hz-20 kHz, Half PowerFrequency ResponceIntermodulation Distortion 60 Hz:7 kHz,4:1,Half PowerChann

11、el Separation Half Power ATT.max input 600 ohm shuntResidual Noise Att,min12.7 kHz LPFIHF-A NetworkS/N ratioSlew Rate Sensitivity(Att.max)Rated PowerVoltage GAINAtt.maxInput ImpeddanceControlsFront PanelRear PanelConnectorsInputOutputIndicatorsPOWERPROTECTIONCLIPSLGNALProtection circuitFan CircuitPC

12、 LimitterPower RequirementsIdle Power Consumption1/8 Power Consumption (32 ohm)Maximum Power Consumption (32 ohm)Dimentions (W x H x D)WeightMODE switch(STEREO/BRIDGE/PARALLEL)Filter switchLOW CUTx2 (-12 dB/oct)HIGH CUTx2 (-6 dB/oct)Barrier strip terminalXLR-3-31 typeBarrier strip terminalGreenx2 (R

13、ed)x2 (Red)x2 (Green)POWER switch on/off muteDC detectionTEMP (heatsink temp/90C)Low Speed (50C) Variable, High Speed (70C)RL/ 65 dB20 Hz-20 kHz +4 dBu (100 V)+1 dBu (70 V)38.2 dB30 kohm (balance) 15 kohm (unbalance)POWER switch (push on/push off)Attenuator (31position)x2150 W+150 WRL= 64 ohm (100 V

14、)RL= 32 ohm (70 V)10 Hz- 40 kHz (THD + N= 0.1 %)0.1 %0 dB,+0.5 dB,-1 dB F= 20 Hz-50 kHz0.1 %/ -65 dB/ -65 dB+/35 V/uSSPECIFICATIONS4XH1505XH150PANEL LAYOUTFront PanelRear PanelPOWERPOWERSIGNAL CLIPSIGNALCLIPPROTECTIONCH ACH BONOFF1 POWER switch and indicator2 SIGNAL indicators3 CLIP indicators4 PROT

15、ECTION indicator1 FILTER switches (CHANNEL A,B)2 Volume controls (CHANNEL A,B)3 OUTPUT VOLTAGE switch4 SPEAKERS terminals (CHANNEL A,B)5 INPUT terminals (CHANNEL A,B)6 GND terminals1243123564INPUTCHANNEL BCHANNEL AOFF10kHz5kHzOFF10kHz5kHzOFF80Hz40HzOFF80Hz40HzCHANNEL BCHANNEL ALOW CUTLOW CUTFILTERHI

16、GH CUTHIGH CUTOUTPUT VOLTAGECHANNEL BCHANNEL A70V100V201510630dB00403025201510630dB00403025INPUTCHANNEL BCHANNEL AGGSPEAKERSCHANNEL BCHANNEL A6XH150DIMENSIONSBLOCK DIAGRAMIC101IC102IC104IC105PA7IC101IC103IC104IC105132132132756KEC-92353Unit: mm7XH150PA7SUB 1/5SUB 2/5SUB 3/5SUB 4/5SUB 5/5CIRCUIT BOARD

17、 LAYOUT & WIRINGTop ViewFront ViewSUB 4/5Wire colorPower Transformer3NC2-V2941008XH1501/52/570 480a 6410410410410410410Top coverPower Transformer410Rear panel50a50a50b(Fig. 1)(Fig. 2)70: Bind Head Screw SP 5.0X10 MFZN2BL (VU688100) 80: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)410: Bind Head

18、 Tapping Screw-B 4.0X8 MFZN2BL (EG340190)50: Bind Head Screw A4.0X8 MFZN2BL (VP156800)410: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)1.Top Cover1-1 Remove 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

19、 1)2-2Remove the four (4) screws marked 70. The power transformer can then be removed. (Fig. 1)3.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 board can then be removed. (Fig. 1)4.SUB 2/5 Circuit Board4-1 Remove the top

20、 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)DISASSEMBLY PROCEDURE9XH1503/54/5150: Bind Head Screw 4.0X45 MFZN2BL (VB857700) 200220: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)380

21、: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190)380a380a380b380b(Fig. 3)200220150150Front panelDC Fan5.Panel Assembly5-1 Remove the top cover. (See Procedure 1)5-2Remove the three (3) screws marked 380a and the two (2) screws marked 380b. The panel assembly can then be removed.(Fig. 3)6.SUB 3/5

22、Circuit Board6-1 Remove the top cover. (See Procedure 1)6-2 Remove the panel assembly. (See Procedure 5)6-3 Remove the two (2) screws marked 200. The SUB 3/5 circuit board can then be removed. (Fig. 3)7. SUB 4/5 Circuit Board7-1 Remove the top cover. (See Procedure 1)7-2 Remove the panel assembly. (

23、See Procedure 5)7-3 Remove the two (2) screws marked 220. 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 panel assembly. (See Procedure 5)8-3 Remove the four (4) screws marked 150. The DC fan can then be removed. (Fig. 3)130(

24、Fig. 4)(Fig. 5)130130130250 4250: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)130: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190) FAN Angle9. PA7 Unit9-1 Remove the top cover. (See Procedure 1)9-2 Remove the panel assembly. (See Procedure 5)9-3 Remove the four (4) screws marked 250. The PA7

25、unit with the chassis can then be removed. (Fig. 4)9-4 Remove the eight (8) screws marked 130. The PA7 unit can then be removed. (Fig. 5)10XH150PA760: Bind Head Screw SP 3.0X8 MFZN2Y (EG330290) 80: Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600) (Fig. 6)60a 480c 480c 480b 480b 4Holder AHolder AI

26、solation sheet AIsolation sheet AHeat Sink10. PA7 Circuit Board10-1 Remove the top cover. (See Procedure 1)10-2 Remove the panel assembly. (See Procedure 5)10-3 Remove the PA7 unit. (See Procedure 9)10-4 Remove the sixteen (16) screws marked 80b; the four (4) screws marked 80c and the six (6) screws

27、 marked 60a. The PA7 circuit board can then be removed. (Fig. 6)(Fig. 7)270Rear assembly270270270270: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)11. Rear Assembly11-1 Remove the top cover. (See Procedure 1)11-2Remove the six (6) screws marked 270 . The rear assembly can then be removed. (Fig. 7

28、)11XH1502/55/5Cover, Speaker terminalRear panel440 2260ia 4260ia 2260ib 2260b 2420 2260:Bind Head Tapping Screw-B 3.0X12 MFZN2BL (VQ074600)260ia: Bind Head Screw A4.0X8 MFZN2BL (VP156800) 260ib: Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)420:Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300) 44

29、0:Bind Head Tapping Screw-B 3.0X8 MFZN2BL (EP600190)(Fig. 8)12. SUB 5/5 Circuit Board12-1 Remove the top cover. (See Procedure 1)12-2 Remove the rear assembly. (See Procedure 11)12-3 Remove the two (2) screws marked 440 and the two (2) screws marked 420 and the two (2) screws marked 260b. The SUB 5/

30、5 circuit board can then be removed. (Fig. 8)12XH150M5238AP (XM085A00)Operational AmplifierIC1011234-V8765Output A+VNon-InvertingInput A-DC Voltage Supply+DC VoltageSupplyOutput BInvertingInput BNon-InvertingInput BInvertingInput A+-+-IC BLOCK DIAGRAMXS250/350XS250/350XS250/35013SUB 1/5 Circuit Boar

31、dSUB 2/5 Circuit BoardSUB 3/5 Circuit BoardSUB 4/5 Circuit BoardComponents sideComponents sideComponents side Components sideComponents sideCIRCUIT BOARDSfrom T101to SUB 2/5-CN103to PA7-CN702from T101to PA7-CN404SUB(J) :3NA-V290020 2SUB(U) :3NA-V290030 2SUB(H) :3NA-V290040 2to SUB7-CN508to PA7-CN201

32、to PA7-CN301to PA7-CN705SUB 5/5 Circuit Boardto SUB 2/5-CN103XS250/350XS250/350XS250/35014PA7 Circuit Board3NA-V289970 1Components sideto SUB 2/5-CN102from FANto SUB 3/5-CN401to SUB 2/5-CN101to SUB7-CN509to SUB 5/5-CN60315XH150INSPECTIONSA STEREO and PARALLEL OperationBefore performing any of the fo

33、llowing adjustments, set the unit as follows:1. ATTENUATIONS Maximum2. Input terminal:Cannon connector pin 2 is HOT, pins 1 and 3 are GROUND3. OUTPUT VOLTAGE switch:100 V4. Output terminal:RL = 32 and 64 ohm/more than 150 W5. Others:Both Channel operations are required, if there is no particular ind

34、ication. In addition, turn off the filter switches if there is no particular indication. Do not connect the ground of the speaker terminal to the ground on the input side.Adjustment Specifications1. Fan TestWhen turning on the power switch, confirm that both fans on the right and left sides regulate

35、 at low speed. 2. Muting TestAfter applying power to the unit, the PROTECTION indicator should remain ON for 2.5 +/- 1 second, to indicate that the protection circuitry is operating and the indicator should go out. NO signal is output while this indicator is lit.3. Idle Current TestConnect the input

36、 terminal to the GROUND and adjust the VR201 (A channel +), VR202 (A channel -), VR301 (B channel +) and VR302 (B channel -) so that the DC voltage Vb between pin 1 and pin 2 of the CN203 (A channel +), CN204 (A channel -), the CN303 (B channel +) and the CN304 (B channel -) should be 1.0 +/- 0.2 mV

37、. 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 is 0 +/- 75 mV.5. Gain TestCheck that the OUTPUT is + 28.2 +/- 0.5 dBu when a sine wave of 1 kHz at -10 dBu

38、is applied to the INPUT. 6. Frequency Response TestHIGH CUT switch and LOW CUT switch OFF:When a sine wave of 20 Hz, 1 kHz or 20 kHz at -10 dBu is applied to the INPUT, check that the output is 0.0 +/- 0.5 dB at 20 Hz and - 0.5 +/- 0.5 dB at 20 kHz using 1 kHz as a reference.When a sine wave of 5 kH

39、z, - 10 dBu is applied to the INPUT, check that the output is - 3.5 +/- 1.0 dB using 1 kHz as a reference at the filter switch OFF.When a sine wave of 10 kHz, - 10 dBu is applied to the INPUT, check that the output is - 3.0 +/- 1.0 dB using 1 kHz as a reference at the filter switch OFF.When a sine w

40、ave of 40 Hz, - 10 dBu is applied to the INPUT, check that the output is - 3.0 +/- 1.0 dB using 1 kHz as a reference at the filter switch OFF.When a sine wave of 80 Hz, - 10 dBu is applied to the INPUT, check that the output is - 3.5 +/- 1.0 dB using 1 kHz as a reference at the filter switch OFF.7.

41、Harmonic Distortion TestWhen a high quality sine wave is applied at 20 Hz, 1 kHz, or 20 kHz, the harmonic distortion should be as follows:*This test should be finished within 30 minutes.Power output level THD20 Hz1 kHz20 kHzXH150150 W + 150 W (39.0 dBu/ch, 32 ohm, switch=70V)150 W + 150 W (42.0 dBu/

42、ch, 64 ohm, switch=100V)= 0.1 % = 0.1 % = 0.1 %= 0.1 % = 0.1 % = 0.1 %16XH1508. Channel Separation Test8-1 Apply a - 5 dBu, 20kHz sine wave into the channel A input.8-2 Short the input to channel B with a 600 ohm load.8-3 Set the output of channel A at a reference of 0 dB.8-4 If the channel B attenu

43、ator is set to the same as channel A, channel B output should be less than -65 dB. (RL = 64 ohm)9. Noise Test9-1 Set the input attenuator at maximum.9-2 Short the input to the GROUND with a 600 ohm load.9-3 The output noise level should be less than - 61 dBm.9-4 Set the input attenuator at oo, the n

44、oise level should be less than - 65 dBu.* Be careful that this is not affected by noise induced during the inspection.10. Stability TestWhen a rectangular wave of 10 kHz, - 10 dBu is applied to the input and a capacitor of 10 pF - 0.47 F is connected with a 32 ohm load resistor in parallel, the over

45、shoot and the ringing should be as follows. Overshoot: Vp/Vo = 1.8 Ringing: less than 5 wavesNext, when the 32 ohm load resistor is removed and the load is only the capacitor 10 pF - 0.47 F, the overshoot and the ringing should be as follows. Overshoot: Vp/Vo = 2.5 Ringing: fades away in less than 7

46、 waves and no oscillation11. Protection Circuitry TestCheck that the relay does not work when you apply a sine wave of + 3.0 dBu 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, 6.3 dBu to the input, the signal

47、 is cut off within 2 seconds, and the PROTECTION indicator lights up.Finally, check that when no signal is applied, the amplifier resumes to normal operation within 10 seconds.12. PC Limiter Circuitry TestCheck with an oscilloscope that the OUTPUT is as follows when a sine wave of -14 dBu at 1 kHz i

48、s applied to the INPUT and the output is shorted with an 8 ohm load (+/- 5 %). At this time, check that the CLIP indicator lights up.Output level: Vp-p = 30 V *This test should be finished within 30 minutes.13. OUTPUT VOLTAGE Switch CheckOUTPUT VOLTAGE switch 70V:Check that the OUTPUT is Vp-p = 230

49、V, when a sine wave of 1 kHz at 6.0 dBu is applied to the INPUT.14. Signal Indicator TestWhen a sine wave of 1 kHz, -23 dBu is applied to the input, the SIGNAL indicator should light up.Check the output terminal without load.B. Settings after the testThe attenuator should be set to oo.The MODE switc

50、h should be set at STEREO.OUTPUT VOLTAGE SWITCH: set to 70 VC. Others0 dBu = 0.775 VWhen measuring the noise level, use a DIN audio filter.POWER AMPLIFIERXH150PARTS LIST The numbers in “QTY” shows quantities for each unit. The parts with “-” in “Parts No.” are not available as spare parts. The mark