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Alto ACL4 Service Manual

Quad/compressor/limiter
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Download this manual See also: User Manual
Service Manual
Model: ACL4
QUAD/COMPRESSOR/LIMITER
www.altoproaudio.com
Version: 1.1

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Summary of Contents for Alto ACL4

  • Page 1 Service Manual Model: ACL4 QUAD/COMPRESSOR/LIMITER www.altoproaudio.com Version: 1.1...
  • Page 2 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. Troubleshooting 10. Notes...

  • Page 3: Audio Output

    SPECIFICATIONS FOR ACL4 AUDIO INPUT Connectors XLR and 1/4” TRS (Pin 2 and Tip hot) Type Electronically balanced/unbalanced, RF filtered Impedance Balanced >50Kohm, Unbalanced>25Kohm Nominal operating level +4dBu/-10dBV switchable Max input level >+24dBu balanced and unbalanced CMRR Typically>50dB at 1KHz...

  • Page 4: Function Switches

    Attack program dependent, typ. <5ms Release Program dependent, typ. 20dB/s FUNCTION SWITCHES Enables the “Interactive Knee Adaptation” SMART characteristics. CONTOUR Allows for frequency dependent detection. Switches between input and output for the Level I/O METER Meter. BYPASS Relay controlled hard-bypass Changes the internal reference level from +4 dBu OPERATING LEVEL to –10dBu.
  • Page 11 PCB : ACL4-FP Bottom Layer PCB : Bottom Solder Mask ACL4-FP PCB : ACL4-FP TOP Layer PCB : Top overlay ACL4-FP...
  • Page 12 PCB : TOP Solder Mask ACL4-FP ACL4-FP Drill Drawing PCB : T Tool Hole Size Hole Count Plated Tool Travel --------------------------------------------------------------------------- 20mil (0.508mm) 78.74 Inch (2000.02 mm) 24mil (0.6096mm) 81.24 Inch (2063.44 mm) 31mil (0.7874mm) 88.93 Inch (2258.72 mm) 39mil (0.9906mm) 36.14 Inch (917.94 mm)
  • Page 13 PCB : Bottom Layer CLE40-PU PCB : Bottom Solder Mask CLE40-PU PCB : TOP Layer CLE40-PU PCB : Top overlay CLE40-PU...
  • Page 14 PCB : TOP Solder Mask CLE40-PU Drill Drawing PCB : CLE40-PU Tool Hole Size Hole Count Plated Tool Travel --------------------------------------------------------------------------- 24mil (0.6096mm) 50.95 Inch (1294.10 mm) 31mil (0.7874mm) 43.74 Inch (1111.07 mm) 39mil (0.9906mm) 35.01 Inch (889.22 mm) 47mil (1.1938mm) 17.22 Inch (437.45 mm) 55mil (1.397mm) 30.45 Inch (773.34 mm)
  • Page 16 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate ├0001--------------------------------- MA00080 1.0000...
  • Page 17 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate ├0010--------------------------------- NI03258 4.0000...
  • Page 18 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate ├0032--------------------------------- MG00560 1.0000...
  • Page 19 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │└0002------------------------------- NI00014 1.0000...
  • Page 20 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │├0011------------------------------- RC00211 4.0000...
  • Page 21 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate ││...
  • Page 22 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │ ├0012------------------------------ RD00294 4.0000...
  • Page 23 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │ ├0024------------------------------ RD00088 12.0000...
  • Page 24 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │ │...
  • Page 25 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │ ├0048------------------------------ SF00004 8.0000...
  • Page 26 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate ││...
  • Page 27 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │ ├0006------------------------------ RD00285 4.0000...
  • Page 28 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │ ├0018------------------------------ RD00093 4.0000...
  • Page 29 Date 2004/12/14 Prepared by 030037[蘇文祥] Page No.: Item No. PF01981 Version UNIT: DESCRIPTION: ACL4 Date: 2004/11/06 ACL4 ALTO 230V Version Item No Loss % Ver. Unit Effective Date Cardinal Item Descri Usage Rate @:Phantom Layer Component Remark Attrition Rate │├0005------------------------------- HA01798 1.0000...