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Alto EQU231TWIN-MKII V2 Service Manual

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MODEL: EQU231TWIN- MKII V2
www.altoproaudio.com
Version 1.0
Revised on Jan,2010

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Summary of Contents for Alto EQU231TWIN-MKII V2

  • Page 1 MODEL: EQU231TWIN- 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......................12 8. Exploded View & Mechanical Parts List..............16 9. BOM List........................18...

  • Page 3: Introduction

    1. Introduction The EQU231TWIN-MKII V2 Graphic Stereo 31-Band Equalizer 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”...

  • Page 4: Specification

    2. Specification Type EQU231TWIN-MKII V2 2*31-Band: 1/3 Octave, ISO spacing(3H series) Slider Travel 45mm 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 ---...
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  • Page 8 --- 6 ---...
  • Page 9 --- 7 ---...

  • Page 10: Wiring Diagram

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

  • Page 11: Pcb Layout

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

  • Page 14: 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 EQU231TWIN-MKII V2 3. Connect the output of EQU231TWIN-MKII V2 to the input of AP Adjustment according to following procedures 1.
  • Page 15 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 16 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 --- 14 ---...
  • Page 17 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 18: Exploded View & Mechanical Parts List

    8. Exploded View & Mechanical Parts List --- 16 ---...
  • Page 19 Mechanical Parts List Part No Description Specification 1 MB03290 chassis EQU231TWIN-MKⅡ 2 MB03287 rear panel EQU231TWIN-MKⅡ_V1.0 3 MC00578 top cover EQU231MKⅡ 4 MA04866 front panel EQU231TWIN-MKⅡ ALTO_V1.1 5 MI02057 AC socket EQU231TWIN-MKⅡ _V1.0 6 TC00212 fixed voltage transformer PT-231-II-230V 7 TC00212 fixed voltage transformer PT-231-II-230V 8 MG00042...

  • Page 20: Bom List

    EQU MKⅡ SERIES ALTO_V1.2 ├0007 NI00002 plastic nut-RS φ7/16"*G20/15*4.8 ├0008 NE12788 label EQU231TWIN-MKⅡ_V1.0 ├0009 NF00061 assurance card-RS-C ALTO_V1.1 ├0010 NE05004 label ALTO PF_V1.2 ├0011 NE02717 label MADE IN CHINA ├0012 NB02908 inner case-RS-CT EQU231TWIN-MKⅡV2 ALTO_V1.1 ├0013 NB02906 barrier EQUTWIN-MKⅡ(3H)_V1.0 ├0014 ND00347 dustproof cloth 0.35t*348.5*128mm black 2016B_V1.0...
  • Page 21 Class Part No Description Specification Insert location Remark MI01998 fixed bracket EQU231MKⅡ ├0044 MI03214 front board EQU231TWIN-MKⅡ V2 11*127.9*341_V1.1 ├0045 HK02066 PC board-RS P-EQU31PU-Ⅱ-1-DIP ├0046 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...
  • Page 22 Class Part No Description Specification Insert location Remark │　│　　　├0010 RA00973 fixed resistor 1/8W 100KΩ R19,R22 │　│　　　├0011 RA01112 fixed resistor 1/4W 100Ω │　│　　　├0012 RA01413 fixed resistor 1/4W 2.7KΩ │　│　　　├0013 RA01125 fixed resistor 1/4W 56KΩ R1,R2 │　│　　　├0014 RA01111 fixed resistor 1/4W 100KΩ R23,R16,R21 C1,C2,C3,C4,C5,C6,C7,C8,C13, │　│　　　├0015 CB00242...
  • Page 23 Class Part No Description Specification Insert location Remark RD00292 SMD precise resistor 1/10W 1.00MΩ ±1% 0603 │　│　├0021 CI00268 SMD ceramic capacitor-RS 0603 47PF/50V NPO ±5﹪ C9,C10 │　│　├0022 HK04108 PC board P-EQU31PU-Ⅱ-AI │　│　└0023 │　│　　　├0001 HA01920 wire-RS J3,J39,J38 │　│　　　├0002 HA01922 jump J9,J10,J11,J12,J4,J5,J6,J7,J8,J13,J36 │　│　　　├0003 HA01925 jump 10mm...
  • Page 24 Class Part No Description Specification Insert location Remark CF00155 metal-film capacitor MSC 0.22uF/63V 5% CASE02 C153,C154,C155 │　　　├0015 CC00067 mylar capacitor 0.0027uF/100V 10% C164 │　　　├0016 CC00068 mylar capacitor 0.027uF/100V 10% C157,C158,C159 │　　　├0017 CF00193 metal-oxide-film resistor MSC 2.2uF/63V 5% CASE05 C145,C146,C147,C117 │　　　├0018 CC00058 mylar capacitor 0.0033uF/100V 3%...

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