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Alesis 3630 - User Manual

Alesis 3630
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3630 Compressor/Limiter
And
NanoCompressor
Service Manual V 1.00e
5/1/97
T.J. Goodwin
Editor
WWW.ALESIS.COM
Alesis 3630Compressor Service Manual 1.00 i 12/11/02

Table of Contents

Other manuals for Alesis 3630

Preview: Reference Manual
Reference Manual31 pages

Questions and Answers

  • D
    Danielle BennettJul 26, 2025
    What to do if my Alesis Air Compressor is dead (no LEDs, no audio)?
    • D
      dhunterJul 26, 2025
      If your Alesis Air Compressor unit shows no LEDs and produces no audio, the issue might stem from several causes: * A faulty AC adapter: Verify the adapter provides a 9VAC output and replace it if it doesn't. * A broken power supply input jack: Inspect the jack and replace it if necessary. * For the 3630 model, a disconnected ribbon cable: Check the connection between the main PCB and the LED PCB (J5 to J9) and reseat it if needed. * A faulty component in the power supply circuitry: Examine electrolytic capacitors C1, C2, C25, and C34, diodes D1-D4, and regulators U1 and U8.
  • S
    Sean JohnsonAug 10, 2025
    Why are all Gain Reduction LEDs on my Alesis Air Compressor 3630 on?
    • M
      Martha ChanAug 10, 2025
      If all Gain Reduction LEDs are illuminated on your Alesis 3630 Air Compressor, it may be due to a failure of U18 on the LED PCB. Inspect U18 and replace it if necessary.

Summary

Preface

Safety Warnings

Detailed Safety Suggestions

Acknowledgments

1.00 General Descriptions

1.10 3630 Compressor;Limiter

Description of the 3630 Compressor/Limiter unit.

1.20 NanoCompressor

Description of the NanoCompressor unit.

2.00 Power Supplies

3.00 Signal Paths

3.10 Audio Signal Paths

Details the audio signal flow within the units.

3.20 Control Signal Paths

Details the control signal flow within the units.

3.21 Compression Detector

Describes the compression detector circuit.

3.22 3630 Gate Detector

3.30 LED Displays

3.40 3630 Schematic Cross Connections

4.00 Test Procedures

4.10 Distortion Adjustments

Procedure for setting distortion levels.

4.20 Input;Output Level Test

4.30 Function Test

4.40 Stereo Mode Test

4.50 Final Test

5.00 Troubleshooting

6.00 Updates And Corrections

6.10 3630 Changes

Updates specific to the 3630 model.

6.11 Revision B Main PCB Distortion Reduction

Details a specific PCB modification for distortion reduction.

6.12 Power Up Oscillation

6.13 Revision C Main PCB Dual;Stereo Switch Noise

6.20 NanoCompressor Changes

6.21 Revision B Main PCB Right Channel Sensing Resistor

Details a specific PCB modification for signal sensing.

6.22 Revision C Right Channel Normalization

6.23 Improvement of High Frequency Phase Response

6.24 Improvement of Power Supply Stability Under High Output Loading

7.00 Service Parts List

7.10 3630 Service Parts List

Parts list for the 3630 model.

7.20 NanoCompressor Service Parts List

8.00 Service Manual History

9.00 Dictionary of selected terms

NOTES

10.00 Schematics

Alesis 3630 Specifications

General IconGeneral
Ratio1:1 to ∞:1
Input Impedance10kΩ, balanced
Frequency Response20Hz to 20kHz ±0.5dB
Total Harmonic Distortion<0.1% @ 1kHz
ConnectorsXLR and 1/4"
SidechainYes

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