Alto EQU215- MKII V2 Service Manual
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Alto EQU215- MKII V2 Service Manual

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MODEL: EQU215- MKII V2
www.altoproaudio.com
Version 1.0
Revised on Jan,2010

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Summary of Contents for Alto EQU215- MKII V2

  • Page 1 MODEL: EQU215- 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......................9 6. PCB Layout........................10 7. Test Procedure......................14 8. Exploded View & Mechanical Parts List...............18 9. BOM List..........................20...

  • Page 3: Introduction

    1. Introduction The EQU215-MKII V2 Graphic Stereo15-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 EQU215-MKII V2 2*15-Band: 2/3 Octave, ISO spacing(1H 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 Active balanced XLR and 1/4'' TRS Output connections...

  • Page 5: Block Diagram

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

  • Page 6: Schematic Diagram

    4. Schematic Diagram --- 4 ---...
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  • Page 11: Wiring Diagram

    5. Wiring Diagram --- 9 ---...

  • Page 12: Pcb Layout

    6. PCB Layout --- 10 ---...
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  • Page 16: Test Procedure

    7. Test Procedure EQU215-MKII V2 Finished Product Test Test Instruments 1. AP (Audio Precision) 2. Dual-track oscilloscope Instrument setting 1. Set proper AC input voltage 2. Connect the output signal of AP to the input of EQU215-MKII V2 3. Connect the output of EQU215-MKII V2 to the input of AP Adjustment according to following procedures 1.
  • Page 17 4. Adjust the input level so that the AP output is 0dB, the frequency response is as following 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 18 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 --- 16 ---...
  • Page 19 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 20: Exploded View & Mechanical Parts List

    8. Exploded View & Mechanical Parts List --- 18 ---...
  • Page 21 Part No Description Specification 1 MB03381 chassis EQU215-MKⅡ_V1.0 2 MB03379 rear panel EQU215-MKⅡ_V1.0 3 MC00578 top cover EQU231MKⅡ 4 MA05032 front panel EQU215-MKⅡ ALTO_V1.0 5 HC00015 AC socket S)315-B (including AC selector) 6 MG00042 black screw M3*10 7 NI00315 PWR SW button 5*5*9(3.3*3.3) 8 MG00061 black screw...

  • Page 22: Bom List

    NB02904 barrier EQU131-MKⅡ right_V1.0 ├0035 NB03092 cushion EQU131MK Ⅱ _V1.0 ├0036 NB03062 inner case-RS-CT EQU215-MKⅡV2 ALTO_V1.1 ├0037 NB02088 carton (1H) ALTO 19"_V1.1 ├0038 HK04168 PC board-RS P-EQU215PU-Ⅱ-DIP ├0039 RA00209 fixed resistor 1/4W 680Ω R47,R48,R51,R52 │　├0001 RA01413 fixed resistor 1/4W 2.7KΩ...
  • Page 23 Class Part No Description Specification Insert location Remark RD00219 SMD precise resistor 1/10W 20.0KΩ ±1% 0603 R42,R43,R44,R45,R38,R39,R40 │　　　├0002 RD00294 SMD precise resistor 1/10W 24.9KΩ ±1% 0603 │　　　├0003 CI00063 SMD ceramic capacitor 0603 470PF/50V NPO ±5﹪ C42,C43 │　　　├0004 C14,C15,C16,C17,C26,C27,C28,C29,C30, CI00075 SMD ceramic capacitor 0603 0.1uF/50V Y5V +80,-20% │　　　├0005 C31,C32,C33,C100...
  • Page 24 Class Part No Description Specification Insert location Remark AE00553 SenJu solder paste M705-GRN360-K2-V 0.5KG/bottle │　│　└0003 HA03155 wire-RS 18P-3P/5P*2/6P 140/350/400/350mm UL1007 │　├0008 AC00603 lead free soldering bar S100 │　└0009 NA00279 clip-chain bag 0.04t*100*150mm_V1.0 ├0042 AD00012 twin adhesive-RS 90*120mm_V1.0 ├0043 MG00635 copper pillar φ5*M3*0.5PH*14.6 ├0044 MI03014...

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