Alto EQU231VU-MKII V2 Service Manual
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Alto EQU231VU-MKII V2 Service Manual

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MODEL: EQU231VU- MKII V2
www.altoproaudio.com
Version 1.0
Revised on Jan,2010

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Summary of Contents for Alto EQU231VU-MKII V2

  • Page 1 MODEL: EQU231VU- MKII V2 www.altoproaudio.com Version 1.0 Revised on Jan,2010...

  • Page 2: Table Of Contents

    CONTENTS 1. Introduction........................1 2. Specification.........................2 3. Block Diagram......................3 4. Schematic Diagram.....................4 5. Wiring Diagram......................8 6. PCB Layout.........................9 7. Test Procedure......................13 8. Exploded View & Mechanical Parts List..............17 9. BOM List........................19...

  • Page 3: Introduction

    1. Introduction The EQU231VU-MKII V2 Graphic Stereo 31-Band Equalizer/VU meter*2 is an extremely musical and flexible Graphic Equalizer, based on many years of experience and designed to provide a permanent precise equalization to musician, performer, and studio engineer. It can be used wherever is requested to modify the frequency “contour” of a sound and can offer a solution to many common sound problems and allows the user to use the creativity to obtain nice results in terms of sound characterization.

  • Page 4: Specification

    2. Specification Type EQU231VU-MKII V2 2*31-Band: 1/3 Octave, ISO spacing(2H series) Slider Travel 20mm with positive centre detent Range +/-6dB or +/-12dB selectable Active balanced XLR and 1/4'' TRS Input connections Unbalanced RCA 20k Ω(bal.) Input impedance 15k Ω(unbal.) Maximum input level 14 dBu...

  • Page 5: Block Diagram

    3. Block Diagram --- 3 ---...

  • Page 6: Schematic Diagram

    4. Schematic Diagram --- 4 ---...
  • Page 7 --- 5 ---...
  • Page 8 --- 6 ---...
  • Page 9 --- 7 ---...

  • Page 10: Wiring Diagram

    5. Wiring Diagram --- 8 ---...

  • Page 11: Pcb Layout

    6. PCB Layout --- 9 ---...
  • Page 12 --- 10 ---...
  • Page 13 --- 11 ---...
  • Page 14 --- 12 ---...

  • Page 15: Test Procedure

    2. Dual-track oscilloscope Instrument setting 1. Set proper AC input voltage 2. Connect the output signal of AP to the input of EQU231VU-MKII V2 3. Connect the output of EQU231VU-MKII V2 to the input of AP Adjustment according to following procedures 1.
  • Page 16 4. Adjust the input level so that the AP output is 0dB, the frequency response is as following 10Hz ~ 22KHz +/-2dBu 5. Adjust the input level so that the AP output is 0dB, press the HI-pass button and the frequency response is as following 6.
  • Page 17 7. Press EQ button down, keep RANGE out and the LED indicates +12, adjust slide buttons to maximum and minimum, measure the frequency response independently and the curve shall be as following 8. Turn off the AP input signal and set input level as maximum, the AP setting is as following, now it shall be no more than -82dB --- 15 ---...
  • Page 18 9. Turn on the AP input signal, and set the input level at maximum, the AP setting is as following, the maximum non-distortion level is +28dBu+/-1dB and distortion is 1% 10. Now, the S/N shall be no less than 110dB 11.

  • Page 19: Exploded View & Mechanical Parts List

    8. Exploded View & Mechanical Parts List --- 17 ---...
  • Page 20 Part No Description Specification MB03477 Chassis EQU231VUMKII MB03220 Rear panel EQU231MKII MC00578 Top cover EQU231MKII MA04798 Front panel EQU231VUMKII ALTO HC00015 AC socket (S)315-B(with AC selector) TC00212 Fixed voltage transformer PT-231-II-230V MG00127 Color screw M4*8 MG00042 Black plated screw M3*10 NI00315 Pwer switch 5*5*9(inner3.3*3.3)

  • Page 21: Bom List

    φ3 │　├0002 SD00130 integrated circuit-RS-ACT NJM4580D │　├0003 HC00067 connector(male) 4P 2.5mm 90° │　├0004 HH00046 VU meter 700Ω/150UA P-210SI-xxx ALTO │　├0005 RC00180 carbon-film semi-fixed resistor 10KΩ φ6 standing EVND2A │　├0006 AC00603 lead free soldering bar S100 │　├0007 CB00190 electrolytic capacitor 4.7uF/25V φ4*7mm │　├0008...
  • Page 22 Class Part No Description Specification Insert location Remark MG00162 screw M3*8 │　├0014 MF00037 washer φ3.2*φ5*0.8t │　├0015 NC00167 mica-RS 13*18(φ3.6)TO-220 │　├0016 HC00172 connector(male) 3P 3.96mm 180° │　├0017 1.CN1insert HC00256 connector(male) 5P 2.0mm 180° CN2,CN10,CN1 direction is │　├0018 reverse with CN2 HC00257 connector(male) 6P 2.0mm 180°...
  • Page 23 Class Part No Description Specification Insert location Remark CC00039 mylar capacitor 0.1uF/100V 3% C18,C19,C20,C21,C47,C22,C23,C24,C25 │　├0001 CH00053 laminated capacitor 0.1uF/50V Y5V PH5mm C34,C35 │　├0002 SA00098 rectifier diode 1A/400V IN4004 D1,D2,D3,D4,D5 │　├0003 CC00015 mylar capacitor 0.0056uF/100V 3% C38,C39 │　├0004 CB00065 electrolytic capacitor 470uF/25V φ10*16mm C50,C51 │　├0005...
  • Page 24 J1,J2,J37 CA00033 ceramic capacitor-RS 470PF/50V Y5E │　└0029 ND00340 dustproof cloth 0.35t*349*37mm black_V1.3 ├0030 NF00061 assurance card-RS-C ALTO_V1.1 ├0031 NE05004 label ALTO PF_V1.2 ├0032 NE12789 label EQU231VU-MKⅡ_V1.0 ├0033 NI00002 plastic nut-RS φ7/16"*G20/15*4.8 ├0034 NB02907 inner case-RS-CT EQU231VU-MKⅡV2 ALTO_V1.2 ├0035 NB03679 cushion-RS EQU231MKⅡ...
  • Page 25 Class Part No Description Specification Insert location Remark VR1,VR2,VR3,VR4,VR5,VR6,VR7,VR8,VR9, VR10,VR11,VR12,VR13,VR14,VR15,VR16,V insert on HB01810 RC00015 slide potentiometer RA2043-20,handle 20,100KW,whit R17,VR18,VR19,VR20,VR21,VR22,VR23,VR │　├0013 EQU131FPMKII V2 24,VR25,VR26,VR27,VR28,VR29,VR30,VR3 1,VR32 AC00603 lead free soldering bar S100 │　├0014 HK05836 PC board P-EQU131MKⅡ V2-AI │　└0015 R32,R61,R62,R63,R64,R65,R66,R67,R68,R6 9,R70,R71,R72,R73,R74,R75,R76,R77,R78, RA01111 fixed resistor 1/4W 100KΩ...

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