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Alto alpha COMP Service Manual

24x32 bit digital compressor module
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Service Manual
Model: αCOMP
24x32 Bit Digital Compressor Module
www.altoproaudio.com
Version: 1.1

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Summary of Contents for Alto alpha COMP

  • Page 1 Service Manual Model: αCOMP 24x32 Bit Digital Compressor Module www.altoproaudio.com Version: 1.1...

  • Page 2: Table Of Contents

    CONTENTS 1. Specification 2. Block Diagram 3. Schematic Diagram 4. Printed Circuit Board 5. Wiring Diagram 6. Test Procedure 7. Electrical Parts List 8. Exploded Views & Mechanical Parts List 9. Notes...

  • Page 3: Specification

    1. SPECIFICATION (aCOMP) Electrical Frequency Response: +0.5 / -1.5 dB from 20Hz to 20 kHz S/N Ratio (process) 80 dB "A" wtg, 20 Hz-22kHz S/N Ratio (bypass) >90 dB "A" wtg, 20 Hz-22kHz THD+Noise: <0.008% @ 1kHz (0dBV, bypass) Input Number of Channels: Format: 1/4"...

  • Page 4: Block Diagram

    2. Block Diagram...

  • Page 5: Schematic Diagram

    3. Schematic Diagram...

  • Page 7: Printed Circuit Board

    4. Print Circuit Board BOTTOM LAYER BOTTOM SOLDER MASK...
  • Page 8 BOTTOM SILKSCREEN TOP SILKSCREEN...
  • Page 9 DRILL DRAWING Tool Hole Size Hole Count Plated --------------------------------------------------------------------------- 31mil (0.80mm) 39mil (1.00mm) 47mil (1.20mm) 59mil (1.50mm) 98mil (2.50mm) 118mil (3.00mm) 138mil (3.50mm) --------------------------------------------------------------------------- Totals...
  • Page 12 G1 Test Procedures (aCOMP) Required Equipment Audio Precision System 2 with APWin software 100 Mhz oscilloscope connected to APS2 Analyzer Signal Monitor outputs (Ch. A and Ch. B) Connection Mode Use Audio Precision System 2 analog unbalanced (BNC) inputs/outputs...

  • Page 13: Test Procedure

    Test Procedures for AlphaComp Amplitude response test On PC: -Load file: alfacomp_amplitude (APWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two --> LEFT input of the device under test. -LEFT output of the device under test --> A input of Audio Precision System Two -RIGHT output of the device under test -->...
  • Page 14 THD test On PC: -Load file: alfacomp_THD (APWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two --> LEFT input of the device under test. On the Alphacomp: -Turn on the power switch. -Set INPUT volume to maximum.
  • Page 15 S/N test On PC: -Load file: alfacomp_SN (APWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two --> LEFT input of the device under test. On the Alphacomp: -Turn on the power switch. - With hardware bypass switch in COMP position and both outputs connected to the Audio Precision, increase the INPUT level until the device`s outputs clip, and after reduce the INPUT level itself until the outputs exit from clipping state.
  • Page 16 Dynamics test On PC: -Load file: alfacomp_dyn (APWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two --> LEFT input of the device under test. On the Alphacomp: -Turn on the power switch. -Set INPUT volume to maximum.
  • Page 17 Stability test On PC: -Load file: alfacomp_stability (APWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two --> LEFT input of the device under test. -LEFT output of the device under test --> A input of Audio Precision System Two -RIGHT output of the device under test -->...
  • Page 18 SEKAKU ELECTRON INDUSTRY CO.,LTD IEBO_P02 IEBO_P02 Multi-Level BOM Structure Listing Report No.: IEBO_P02 Date 2003/08/20 Prepared by 000011[YAFEN] Page No.: Item No. PF00076 Version UNIT: DESCRIPTIO aCOMP Date: 2002/04/16 aCOMP_ALTO_230V_歐規_無 Version Item No Loss % Ver. Unit Cardinal Effective Date Item Description Usage Rate @:Phantom Layer Component Remark...
  • Page 19 NI02085 1.0000 2002/07/19 │ power switch fixed sleeve │ φ22*9.69 072C blue 0.00 % ├0029--------------------------------- NE03118 1.0000 2002/07/19 ││ program adhesive paper 12*9mm ││ aCOMP CKS:C47F 0.00 % ├0030--------------------------------- NB01480 1.0000 2002/07/19 │ colour box │ aCOMP ALTO 0.00 %...
  • Page 20 Effective Date Item Description Usage Rate @:Phantom Layer Component Remark Attrition Rate ├0031--------------------------------- NB02141 1.0000 2002/12/05 │ outter carton 8 hole │ aVERB aCOMP aMICTUBE ALTO 0.00 % ├0032--------------------------------- MI00408 1.0000 2002/07/19 ││ conduct electricity board ││ aVERB 0.00 % ├0033--------------------------------- NE05008 4.0000 2002/07/19...
  • Page 21 SEKAKU ELECTRON INDUSTRY CO.,LTD IEBO_P02 IEBO_P02 Multi-Level BOM Structure Listing Report No.: IEBO_P02 Date 2003/08/20 Prepared by 000011[YAFEN] Page No.: Item No. PF00076 Version UNIT: DESCRIPTIO aCOMP Date: 2002/04/16 aCOMP_ALTO_230V_歐規_無 Version Item No Loss % Ver. Unit Cardinal Effective Date Item Description Usage Rate @:Phantom Layer Component Remark...
  • Page 22 SEKAKU ELECTRON INDUSTRY CO.,LTD IEBO_P02 IEBO_P02 Multi-Level BOM Structure Listing Report No.: IEBO_P02 Date 2003/08/20 Prepared by 000011[YAFEN] Page No.: Item No. PF00076 Version UNIT: DESCRIPTIO aCOMP Date: 2002/04/16 aCOMP_ALTO_230V_歐規_無 Version Item No Loss % Ver. Unit Cardinal Effective Date Item Description Usage Rate @:Phantom Layer Component Remark...
  • Page 23 SEKAKU ELECTRON INDUSTRY CO.,LTD IEBO_P02 IEBO_P02 Multi-Level BOM Structure Listing Report No.: IEBO_P02 Date 2003/08/20 Prepared by 000011[YAFEN] Page No.: Item No. PF00076 Version UNIT: DESCRIPTIO aCOMP Date: 2002/04/16 aCOMP_ALTO_230V_歐規_無 Version Item No Loss % Ver. Unit Cardinal Effective Date Item Description Usage Rate @:Phantom Layer Component Remark...
  • Page 24 SEKAKU ELECTRON INDUSTRY CO.,LTD IEBO_P02 IEBO_P02 Multi-Level BOM Structure Listing Report No.: IEBO_P02 Date 2003/08/20 Prepared by 000011[YAFEN] Page No.: Item No. PF00076 Version UNIT: DESCRIPTIO aCOMP Date: 2002/04/16 aCOMP_ALTO_230V_歐規_無 Version Item No Loss % Ver. Unit Cardinal Effective Date Item Description Usage Rate @:Phantom Layer Component Remark...
  • Page 25 SEKAKU ELECTRON INDUSTRY CO.,LTD IEBO_P02 IEBO_P02 Multi-Level BOM Structure Listing Report No.: IEBO_P02 Date 2003/08/20 Prepared by 000011[YAFEN] Page No.: Item No. PF00076 Version UNIT: DESCRIPTIO aCOMP Date: 2002/04/16 aCOMP_ALTO_230V_歐規_無 Version Item No Loss % Ver. Unit Cardinal Effective Date Item Description Usage Rate @:Phantom Layer Component Remark...
  • Page 26 Item Description Usage Rate @:Phantom Layer Component Remark Attrition Rate │ fixed piece-ABS φ15*2.7mm white CONTROL30 │ 0.00 % ├0038--------------------------------- NI02409 1.0000 2003/03/05 │ fixed piece-ABS φ25*2.5mm aVERB │ 0.00 % └0039--------------------------------- NF00061 1.0000 2003/05/15 assurance card ALTO 0.00 %...
  • Page 27 8. Exploded Views...