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Alto EQU231- MKII V2 Service Manual

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MODEL: EQU231- MKII V2
www.altoproaudio.com
Version 1.0
Revised on Jan,2010

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Summary of Contents for Alto EQU231- MKII V2

  • Page 1 MODEL: EQU231- 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......................7 6. PCB Layout.........................8 7. Test Procedure......................11 8. Exploded View & Mechanical Parts List..............15 9. BOM List........................17...

  • Page 3: Introduction

    1. Introduction The EQU231-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 EQU231-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 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 ---...
  • Page 7 --- 5 ---...
  • Page 8 --- 6 ---...

  • Page 9: Wiring Diagram

    5. Wiring Diagram --- 7 ---...

  • Page 10: Pcb Layout

    6. PCB Layout --- 10 --- --- 8 ---...
  • Page 11 --- 9 ---...
  • Page 12 --- 10 ---...

  • Page 13: Test Procedure

    7. Test Procedure EQU231-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 EQU231-MKII V2 3. Connect the output of EQU231-MKII V2 to the input of AP Adjustment according to following procedures 1.
  • Page 14 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 15 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 --- 13 ---...
  • Page 16 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 17: Exploded View & Mechanical Parts List

    8. Exploded View & Mechanical Parts List --- 15 ---...
  • Page 18 S/N Part No Description Specification MB03213 Chassis EQU231MKII MB03220 Rear panel EQU231MKII MC00578 Top cover EQU231MKII MA04793 Front panel EQU231MKII 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 19: Bom List

    9. BOM List Class Part No Description Specification Insert location Remark PF01529 EQUALIZER EQU231-MKⅡ V2_ALTO_230V MB03220 rear board-RS-ACT EQU231-MKⅡ ALTO_V1.5 ├0001 MC00578 top cover EQU231MKⅡ ├0002 MA05527 panel EQU231-MKⅡ V2 ALTO_V1.1 ├0003 HD00021 glass tube fuse 100mA 250V φ5.2*20mm CSA/S/UL/VDE ├0004 TC00212 transformer-RS...
  • Page 20 Class Part No Description Specification Insert location Remark CI00058 SMD ceramic capacitor 0603 82PF/50V NPO ±5% C11,C12 │　│　├0008 CI00063 SMD ceramic capacitor 0603 470PF/50V NPO ±5﹪ C42,C43 │　│　├0009 CI00030 SMD ceramic capacitor 0805 1uF/16V Y5V-0805(2012) C36,C37 │　│　├0010 SG00210 SMD integrated circuit LM339DT/(ST) │　│　├0011 SE00011...
  • Page 21 J1,J2,J37 CA00033 ceramic capacitor-RS 470PF/50V Y5E │　└0029 ND00340 dustproof cloth 0.35t*349*37mm black_V1.3 ├0027 NF00061 assurance card-RS-C ALTO_V1.1 ├0028 NE05004 label ALTO PF_V1.2 ├0029 NE12787 label EQU231-MKⅡ_V1.0 ├0030 NI00002 plastic nut-RS φ7/16"*G20/15*4.8 ├0031 NB02909 inner case-RS-CT EQU231-MKⅡV2 ALTO_V1.2 ├0032 NB03679 cushion-RS EQU231MKⅡ...
  • Page 22 Class Part No Description Specification Insert location Remark NI02049 LED spacer support LEDS-14 14mm │　├0006 HA03131 wire-RS 5P(male)-5P(female) 400mm UL1007 28AWG │　├0007 HA03133 wire 6P(male)-6P(female) 400mm UL1007 28AW │　├0008 HA03130 wire-RS 3P(male)-3P(female) 140mm UL1007 28AW │　├0009 HK04113 PC board P-EQU231SW-Ⅱ-SMD │　├0010 HB01237 EQU231SW-Ⅱ(2*2)_VER040921...
  • Page 23 Class Part No Description Specification Insert location Remark CC00058 mylar capacitor 0.0033uF/100V 3% C142,C143 │　　　├0019 CC00059 mylar capacitor 0.033uF/100V 3% C134,C135,C136 │　　　├0020 CF00191 metal-film capacitor MSC 0.33uF/63V 5% CASE02 C148,C149 │　　　├0021 R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,R13,R 14,R15,R16,R17,R18,R19,R20,R21,R22,R23, RA01384 fixed resistor 1/8W 390Ω │　　　├0022 R24,R25,R26,R27,R28,R29,R30,R31,R104,R CC00077 mylar capacitor 0.0047uF/100V 3%...

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