Yamaha-XS-250-Service-Manual电路原理图.pdf

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1、1.97K-9636 1.69K-545 Printed in Japan 99.1 CONTENTS SPECIFICATIONS . 3 PANEL LAYOUT . 4 DIMENSIONS .5 BLOCK DIAGRAM . 5 CIRCUIT BOARD LAYOUT the four (4) screws marked 80c and the six (6) screws marked 60a. The PA7 circuit board can then be removed. (Fig. 6) 9. PA7 Unit 9-1 Remove the top cover. (Se

2、e 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. (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) 130 130130 60a 4

3、80c 4 80c 4 80b 4 80b 4 250 4 250: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)130: Bind Head Tapping Screw-B 4.0X8 MFZN2BL (EG340190) Holder A Holder A Isolation sheet A Isolation sheet A Heat Sink FAN Angle 9 XS250/350 11. Rear Assembly 11-1 Remove the top cover. (See Procedure 1.) 11-2 Remove

4、 the six (6) screws marked 270. The rear assembly can then be removed. (Fig. 7) 12. SUB 5/5 Circuit Board 12-1 Remove the top cover. (See Procedure 1.) 12-2 Remove the rear assembly. (See Procedure 11.) 12-3Remove the four (4) screws marked 440 and the two (2) screws marked 50b and the two (2) screw

5、s marked 60b. The SUB 5/5 circuit board can then be removed. (Fig. 7) (Fig. 7) 2/5 5/5 440 2 Cover, Speaker terminal Rear panel 440 2 50a 4 50a 2 70b 2 60b 2 50b 2 50a: Bind Head Screw A4.0X8 MFZN2BL (VP156800) 50b: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300) 60b: Bind Head Tapping Screw-B 3.0X

6、12 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 assembly 270270 270 270: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900) (Fig. 8) 10 XS250/350 M5238AP (XM0

7、85A00) Operational Amplifier 1 2 3 4-V 8 7 6 5 Output A+V Non-Inverting Input A -DC Voltage Supply +DC Voltage Supply Output B Inverting Input B Non-Inverting Input B Inverting Input A +- +- IC BLOCK DIAGRAM XS250/350XS250/350XS250/350 SUB 1/5 Circuit Board SUB 2/5 Circuit Board SUB 3/5 Circuit Boar

8、d SUB 4/5 Circuit Board SUB 5/5 Circuit Board SX350 SUB(U) :3NA-V290000 2 SUB(H) :3NA-V290010 2 Components side Components side Components side Components side Components side CIRCUIT BOARDS from T101 to SUB 2/5-CN103 to PA-CN404from T101 to SUB 1/5-CN610 to PA-CN201 to PA-CN301 from PA-W201 to PA-C

9、N406 SX250 SUB(U) :3NA-V289980 2 SUB(H) :3NA-V289990 2 11 XS250/350XS250/350XS250/350 PA Circuit Board SX350 3NA-V2899600 1 SX250 3NA-V2899500 1 Components side to SUB 2/5-CN301 to SUB 1/5-CN611 from FAN to SUB 3/5-CN501 to SUB 2/5-CN101 12 13 XS250/350 A STEREO and PARALLEL Operation Before perform

10、ing 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:STEREO 4.Output terminal:RL = 4 ohm/more than 500 W 5.Others:Both Channel operation is required, if no particular indication.

11、Moreover, turn off the filter switch, if no particular indication. Adjustment Specifications 1.Fan Test When turning on the power switch, confirm that both fans of right and left sides regulate at low speed. 2. Muting Test After applying power to the unit, the PROTECTION indicator should remain ON 2

12、.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 Test Connect the input terminal to the GROUND and adjust the VR201 (A channel) and VR301 (B channel) that the DC voltage Vb between the

13、 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 offset Connect the input terminal to the GROUND and check that the DC voltage Vdc of the output terminal should be 0 +/

14、-75 mV. 5.Gain Test Check 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 Test Filter switch OFF: When a sine wave of 20 Hz, 1 kHz or 20 kHz at -10 dBu is applied to th

15、e 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 switch OFF.

16、 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 kHz

17、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. INSPECTIONS 14 XS250/350 7.Harmonic Distortion Test When a high quality sine wave is applied at 20 H

18、z, 1 kHz or 20 kHz, the harmonic distortion should be as follows: *This test should have been finished within 30 minutes. 8. Channel Separation Test 8-1 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

19、at a 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 Test 9-1 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 d

20、Bm. 9-4 Set 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 Test When 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 resi

21、stor in parallel, the overshoot and the ringing should be as follows. Oversshoot: Vp/Vo /= 1.8 Ringing: less than 5 waves Next, 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:

22、 fade away in less than 7 waves and no oscilation 11. Protection Circuitry Test Check 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

23、 sine wave of 1 Hz, 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 Test Check that the OUTPUT should

24、be as follows with an 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 kHz 350 W + 350 W (3

25、3.7 dBu/ch) 250 W + 250 W (32.2 dBu/ch) Power output level (4 ohm) THD 1 kHz20 kHz /= 0.1 %/= 0.1 %/= 0.1 % /= 0.1 %/= 0.1 %/= 0.1 % XS350 XS250 ModelOutput level XS250 XS350Vp-p /= 25V Vp-p /= 20V 15 XS250/350 13. Signal Indicator Test When a sine wave of 1 kHz, -23 dBu is applied to the input, SIG

26、NAL indicator should light up. B BRIDGE Operation Before performing any following adjustments, set the unit as follows: 1. Set the ATTENUATIONS at MAX. 2. Input terminal:Cannon connector pin 2 is HOT, pins 1 and 3 GROUND. 3. MODE switch:BRIDGE 4. Output terminal:(A ch+, B ch+) RL = 4 + 4 ohm/more th

27、an 500 W 5. Connection for measuring: Measure the output at the point as shown below. Adjustment Specifications 1. Gain Test Check that the OUTPUT should be +22.1 +/-1.0 dBu, when asine wave of 1 kHz at -10 dBu is applied to the INPUT. 2. Frequency Response Test When a sine wave of 20 Hz, 1 kHz or 2

28、0 kHz at -10 dBu is applied to the INPUT, check that the output is 0 +/-0.5 dB at 20 Hz and -0.5 +/-0.5 dB at 20kHz taking the 1 kHz as a reference. 3. Harmonic Distortion Test When a high quality sine wave is applied at 20 Hz, 1 kHz or 20 kHz, the harmonic distortion should be as follows: 4. Noise

29、Test 9-1 Set the input attenuator to 0. 9-2 Short the input with a 600 ohm load. 9-3 Measure at the output, noise level should be less than -60 dBm. (LR = 8 ohm) 9-4 Set the input attenuator to , noise level should be less than -60 dBu *Be careful that it is not affected by noise induced during this

30、 inspection. C Settings after the test The attenuator should set to . The MODE switch should set to STEREO. D Others 0 dBu = 0.775 V When measuring noise level,use a DIN audio filter. *This test should have been finished within 30 minutes. XS350 XS250 Power output level (4 ohm) 33.7 dBu 32.2 dBu THD

31、 20 Hz1 kHz20 kHz /= 0.1 %/= 0.1 %/= 0.1 % + - MEASURING INSTRUMENT 4 4 SPEAKERS CHANNEL B GND INPUT CHANNEL A POWER AMPLIFIER XS250/350 PARTS LIST The numbers in “QTY” shows quantities for each unit. The parts with “-” in “Parts No.” are not available as spare parts. The mark “ ” in the remarks col

32、umn indicates that these parts are interchangeable. Notes: DESTINATION ABBREVIATIONS A : Australian modelJ: Japanese model B : British modelU: U.S. model C : Canadian modelV: General export model（110V） E : European modelW : General export model（220V） H : North European modelX: General export model I

33、: Indonesian modelY: Export model WARINIG Conponents having special characteristics are marked and must be replaced with parts having specifications equal to those originally installed. XS250/350 CONTENTS OVERALL ASSEMBLY . 2 PA UNIT. 4 ELECTRICAL PARTS. 5 XS250/350 2 OVERALL ASSEMBLY 15 410400 390

34、430 430 440 440 260 260i 260j 420 410 260i 270 260k 260f 260c 260g 260h 100 190 130 130 120 140 150 160 170 210 205 180 110 220 220 360 380 375 370 350 380 360 250 10 30 50 40 20 60 70 80 260b 260e 200 6 6 450 UL only 260a 260d XS250/350XS250/350 3 *: New partsRANK: Japan only REF NO.PART NO.DESCRIP

35、TIONREMARKSQTYRANK部品名 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 10 15 20 30 30 30 40 50 60 60 60 60 60 60 70 80 90 100 100 110 120 130 140 150 160 170 180 190 200 205 210 220 230 240 250 260 260 260 260 260 260 260a 260a 260a 260a 260a 260a 260b 260b 260b 26

36、0b 260c 260c 260d 260d 260e 260e 260f 260f 260g 260h OVERALL ASSEMBLY Overall Assembly Overall Assembly Overall Assembly Overall Assembly Overall Assembly Overall Assembly Overall Assembly Overall Assembly Main Chassis Protector Insulation Sheet AC Cord AC Cord AC Cord Cord Strain Relief Bind Head S

37、crew Power Transformer Power Transformer Power Transformer Power Transformer Power Transformer Power Transformer Bind Head Screw Bind Head Tapping Screw-B Connector Assembly PA Unit PA Unit FAN Angle Packing Bind Head Tapping Screw-B Fan Bind Head Screw Spring Washer Flat Washer PSW Angle Bind Head

38、Screw Bind Head Tapping Screw-B Power Switch Knob LED Angle Bind Head Tapping Screw-B Connector Assembly Cord Holder Bonding Tapping Screw-B Rear Assembly Rear Assembly Rear Assembly Rear Assembly Rear Assembly Rear Assembly Rear Panel Rear Panel Rear Panel Rear Panel Rear Panel Rear Panel Circuit B

39、oard Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Circuit Board Knob Knob PP 94V-0 T=0.46 UC SJT 3X#18 10A H H05VV-F0.75X3 6A BS H05VV-F 13A SR-6P1 A4.0X8 MFZN2BL SP 5.0X10 MFZN2BL 3.0X8 MFZN2BL 2426&2426

40、8P 120L 4.0X8 MFZN2BL KDE2412PMS3-6A/A47 4.0X45 MFZN2BL #2 4.0 MFZN2BL 4.0X10X0.8 MFZN2BL 3.0X8 MFZN2BL 3.0X8 MFZN2BL SR200 3.0X8 MFZN2BL 2426&2426 7P 200L CV-100 4.0X8 MFZN2BL SUB3 1/5 P.SUPPLY SUB3 1/5 P.SUPPLY SUB3 1/5 P.SUPPLY SUB3 1/5 P.SUPPLY SUB3 2/5 MAIN SUB3 2/5 MAIN SUB2 3/5 LED SUB2 3/5 L

41、ED SUB2 4/5 P.SW SUB2 4/5 P.SW SUB2 5/5 SPEAKER SUB2 5/5 SPEAKER N-GRAY/D-GRAY RED/D-GRAY 総組立 総組立 総組立 総組立 総組立 総組立 総組立 総組立 総組立 絶縁 電源 電源 電源 + 小 電源 電源 電源 電源 電源 電源 + 小 + 束線 + + 小 座金 平座金丸 + 小 + + 束線 （） （） （） （） （） （） （） （） （） （） （） （） （） （） XS350 XS250 XS350 U,V(V294020) XS350 H,W(V294030) XS350 B(V29404

42、0) XS350 A(V294050) XS250 U,V(V294060) XS250 H,W(V294070) XS250 B(V294080) XS250 A(V294090) (V294280) U,V H,W,A B XS350 U,V XS350 H,W,B XS350 A XS250 U,V XS250 H,W,B XS250 A (V288350) XS350 XS250 (V288370) (VV10460) XS350 U,V XS350 H,W,B XS350 A XS250 U,V XS250 H,W,B XS250 A XS350 U,V XS350 H,W,B XS350 A XS250 U,V XS250 H,W,B XS250 A XS350 U,V (XV419B0) XS350 H,W,B,A (XV419B0) XS250 U,V (XV419B0) XS250 H,W,B,A (XV419B0) XS350 (XV419B0) XS250 (XV419B0) XS350 (XV419B0) 06 08 01 01 01 01