RODE Microphones AI-1 Service Manual
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RODE Microphones AI-1 Service Manual

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AI-1 SERVICE MANUAL
Spetember 9, 1994
Revision 2.02

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Summary of Contents for RODE Microphones AI-1

  • Page 1 AI-1 SERVICE MANUAL Spetember 9, 1994 Revision 2.02...

  • Page 2: Warnings

    This document is intended to assist the service technician in the operation, maintenance and repair of the AI-1 Digital Interface. This unit represents one of the building blocks of the complete ADAT system. Together with the AI-1 Reference Manual, this document provides a complete description of the functionality and serviceability of the AI-1.

  • Page 3: Safety Suggestions

    SAFETY SUGGESTIONS Carefully read the applicable items of the operating instructions and these safety suggestions before using this product. Use extra care to follow the warnings written on the product itself and in the operating instructions. Keep the operating instructions and safety suggestions for reference in the future. 1.

  • Page 4: Document Revisions

    Revision 1.2 6/23/93 Original Issue Revision 2.0 2/20/94 Revised entire manual. Added AI-1 QC Test Procedure. Revision 2.01 4/1/94 Added Parts Order Forms to Appendix D. Revised Table of Contents. Issued the following change pages: Title Page, p. iii, p. v, pp. D-4 through D-7 Revision 2.02...

  • Page 5: Table Of Contents

    3.2.3 ADAT to AES/SPDIF transfers............7 3.2.4 ADAT to ADAT transfers ..............8 4.0 AI-1 TESTING ....................10 4.1 Software Version Check ................10 4.2 AI-1 Self Test Routines .................10 4.2.1 AI-1 Self Test Setup ...............10 4.2.2 AI-1 Self Test Description..............10 Revision 2.02...
  • Page 6 8.0 Preparation For Delivery ..............E-15 LIST OF FIGURES Figure 3-1 - AI-1 Signal Flow ................9 Figure E-1 - Self Test Configuration ..............E-3 Figure E-2 - Configuration for AI-1 QC Test Procedure ........E-4 LIST OF TABLES TABLE 4.1 - SELF TEST FAILURES ...............11 Revision 2.02...

  • Page 7: Introduction

    This service manual is intended to serve as a primer to assist repair technicians in isolating and correcting problems associated with the AI-1 Digital Interface. This service manual includes PCB schematics, PCB comp. IDs., self test routines, and a description of the hardware operation of the AI-1 from a servicing point of view.

  • Page 8: List Of Abbreviations

    1.3 List Of Abbreviations The following is a list of abbreviations to terms used throughout this service manual. Abbreviation Definition Abbreviation Definition Amps (unit of current) Local Area Network Alternating Current Light Emitting Diode Audio Engineering Society Little Remote Control Analog to Digital Mega Hertz (1,000,000 Hz) Analog/Digital/Analog...

  • Page 9: Building Blocks

    Within the AI-1 is a power supply, the Main PCB, and a Front Panel PCB. The Main PCB connects to the Front Panel PCB via a ribbon cable. A description of each AI-1 building block as well as the interconnectivity between each building block is presented in the following sections 2.1 AI-1 Power Supply...

  • Page 10: Source And Destination Groups

    AI-1 while the EPROM (U10) contains the system software. Finally, an EEPROM (U41) is used to store the current mode settings of the AI-1. That is, when the AI-1 is powered on, the unit recalls the most recent mode of operation and lights the appropriate LEDs.

  • Page 11: Aes/Ebu Interface

    AI-1 front panel. The 3-pin SIL connector contains a brown and a blue wire. The brown wire goes to +5V and the blue wire goes to ground. If for some reason the AI-1 does...

  • Page 12: Repair

    − CS8401 TRANSMITTER (U13) − CS8411 RECEIVER (U14) − DS8922 DRIVER (U28) A better understanding of how each IC component operates within the AI-1 is described in the following sections. 3.2.1 AES/SPDIF to AES/SPDIF transfers In this scenario, the digital source is an external device using the AES/EBU or S/PDIF interface standard.

  • Page 13: Aes/Spdif To Adat Transfers

    J5, and directed to the ADAT via the Alesis fiber optic digital interface. If the S/PDIF optical input is used, the AI-1 will first convert the optical data input via J11 to electrical signals prior to routing it through to the receiver chip (U14).

  • Page 14: Adat To Adat Transfers

    When the AI-1 is used in this configuration, digital data in the Alesis optical format is routed from the ADAT to the AI-1 via the fiber optic converter J5. After conversion from the optical format to electrical signals, the data is routed into the Audio ASIC (signal: DIGIN). The output of the ASIC (signal: DIGOUT) is converted to light via the fiber optic converter J5, and directed to the destination ADAT via the Alesis fiber optic digital interface.

  • Page 15: Figure 3-1 - Ai-1 Signal Flow

    Figure 3-1 - AI-1 Signal Flow...

  • Page 16: Testing

    AI-1. The first test executed by the AI-1 is the LED test. During this test, the AI-1 will light up vertical pairs of LED's from left to right. It will do this 2 times. The operator is then able to verify the proper...

  • Page 17: Table 4.1 - Self Test Failures

    LEDs on the AI-1 front panel. If any of these LEDs do not light, then there is a most likely a problem with the LED itself. The second test is a switch test. After the LEDs turn off, the operator can press a button to verify its proper operation.

  • Page 18: Schematics

    APPENDIX A AI-1 SCHEMATICS...

  • Page 19: Hardware Upgrades

    APPENDIX B AI-1 HARDWARE UPGRADES...

  • Page 20: Software History

    APPENDIX C AI-1 SOFTWARE HISTORY...

  • Page 21: Version 1.3

    1. Fixes 17.9 KHz cutoff frequency in interpolation filter (used during 44.1 KHz to 48 KHZ rate changes). The new cutoff is 21.26 KHz (-3dB). 2. AI-1 automatically changes the source to ADAT before the self test. This was a problem in V1.3.

  • Page 22: Parts List

    APPENDIX D AI-1 PARTS LIST...
  • Page 23 Confidential - Property of Alesis Corporation GROUP PART No. DESCRIPTION POSITION NOTES 9-79-0036 ASSY PCB MAIN A1 9-79-0037 ASSY PCB PANEL FRONT A1 9-96-1190 ASSY FILTER EMI MB,A1,BR 4-18-1617 CABLE DIL 24-PIN 1.5" RIBBON 4-19-1605 CABLE SIL 3-PIN W/2 TERM SPADE LUG 4-19-1608 WIRE 1 TERM TO TINNED (BLUE) 4-19-1609...
  • Page 24 Confidential - Property of Alesis Corporation 9-15-1065 BUTTON WITH LIGHT PIPE 5-04-1002 INSULATOR 4" x 5" x 0.018" USED UNDER P/S 9-21-1006 KEYPAD RUBBER BUTTON AD/A2 9-23-1006 STRIP RUBBER 5 IN ON TOP OF BUTTON FRAME 1-51-0104 CAP 0.1 MF X7R 1206 MAIN C1-8,C10-11, C14, C17, C20-21,C25-26, C28, C32-33, C35, C43-44,C46-47, C52 1-58-0100...
  • Page 25 (this page has been left intentionally blank) Revision 2.02 9/9/94...
  • Page 26 (this page has been left intentionally blank) Revision 2.02 9/9/94...
  • Page 27 (this page has been left intentionally blank) Revision 2.02 9/9/94...
  • Page 28 (this page has been left intentionally blank) Revision 2.02 9/9/94...

  • Page 29: Qc Test Procedure

    APPENDIX E AI-1 QC TEST PROCEDURE...

  • Page 30: Equipment Requirements

    2.0 AI-1 Self Test This test will verify the proper operation of all AI-1 self tests. this test will also insure that the 48 KHz output from the AI-1 is functioning correctly.

  • Page 31: Figure E-1 - Self Test Configuration

    2.2. Press and hold the ADAT CHANNEL 1/2 and SOURCE S/PDIF buttons simultaneously while applying power to the AI-1. 2.3. Verify that the AI-1 lights up vertical pairs of LED's from left to right 2 times. If any of these LEDs do not light, then the unit fails its LED Self Test.

  • Page 32: Interface Test Setup

    RIGHT INPUT jack of the Headphone Amplifier. 3.9. Plug the headphones into the headphone jack of the R-DAT. 3.10. Apply power to the R-DAT, the ADAT, the Headphone Amplifier and the AI-1. Figure E-2 - Configuration for AI-1 QC Test Procedure...
  • Page 33 This test will verify that the AI-1 is capable of transferring data from the ADAT to an S/PDIF destination. During this test, audio will be transferred from the ADAT to the R-DAT through the AI-1 at both the 44.1 KHz and 48 KHz sampling rates. In addition, all 8 ADAT channels of the ADAT will be tested, two channels at a time.

  • Page 34: S/Pdif To Adat Interface Test

    5.0 S/PDIF to ADAT Interface Test This test will verify that the AI-1 is capable of transferring data from an S/PDIF source to the ADAT. During this test, audio will be transferred from the R-DAT to the ADAT through the AI-1 at both the 44.1 KHz and 48 KHz sampling rates.
  • Page 35 5.12. Rewind the R-DAT back to the start of the audio recorded in step 4.21. 5.13. Press ADAT CHANNEL = 3-4 on the AI-1 front panel. Verify that its corresponding LED is lit solidly. 5.14. Press RECORD 1 and RECORD 2 on the ADAT. Verify that the corresponding green and red LEDs are not lit.
  • Page 36 Record the results of this test on the data sheet. 5.42. Press STOP on the ADAT. 5.43. Press DESTINATION RATE = 48 KHZ on the AI-1 front panel. Verify that its LED is lit solidly. 5.44. Press ADAT CHANNEL = 1-2 on the AI-1 front panel. Verify that its corresponding LED is lit solidly.
  • Page 37 5.61. Press LOCATE 1 on the ADAT. 5.62. Rewind the R-DAT back to the start of the audio recorded in step 4.8. 5.63. Press ADAT CHANNEL = 5-6 on the AI-1 front panel. Verify that its corresponding LED is lit solidly.

  • Page 38: Adat To Aes/Ebu Interface Test

    6.0 ADAT to AES/EBU Interface Test This test will verify that the AI-1 is capable of transferring data from the ADAT to an AES/EBU destination. During this test, audio will be transferred from the ADAT to the R-DAT through the AI-1 at both the 44.1 KHz and 48 KHz sampling rates.

  • Page 39: Aes/Ebu To Adat Interface Test

    7.0 AES/EBU to ADAT Interface Test This test will verify that the AI-1 is capable of transferring data from an AES/EBU source to the ADAT. During this test, audio will be transferred from the R-DAT to the ADAT through the AI-1 at both the 44.1 KHz and 48 KHz sampling rates.
  • Page 40 7.11. Press LOCATE 1 on the ADAT. 7.12. Rewind the R-DAT back to the start of the audio recorded in step 6.21. 7.13. Press ADAT CHANNEL = 3-4 on the AI-1 front panel. Verify that its corresponding LED is lit solidly.
  • Page 41 Record the results of this test on the data sheet. 7.42. Press STOP on the ADAT. 7.43. Press DESTINATION RATE = 48 KHZ on the AI-1 front panel. Verify that its LED is lit solidly. 7.44. Press ADAT CHANNEL = 1-2 on the AI-1 front panel. Verify that its corresponding LED is lit solidly.
  • Page 42 7.55. Press LOCATE 1 on the ADAT. 7.56. Rewind the R-DAT back to the start of the audio recorded in step 6.8. 7.57. Press ADAT CHANNEL = 3-4 on the AI-1 front panel. Verify that its corresponding LED is lit solidly.

  • Page 43: Preparation For Delivery

    8.0 Preparation For Delivery Prepare the AI-1 for shipping. 8.1. Power off the AI-1. Remove all connected cables 8.2. Verify that all screws are installed, and that the fiber optic connector covers are installed. 8.3. Record the results on the data sheet.
  • Page 44 AI-1 REPAIR SHEET Rev - 2/7/94 JWS UNIT S/N: AI42 MFG DATE: [ DATE REPAIRED: [ RA NUMBER: SERVICE TECH: S/W RECEIVED: S/W INSTALLED: LABOR HRS: COMPLAINT COMMENTS QC TEST PROCEDURE (Complete for each unit) 2.4 LED SELF TEST PASS FAIL 2.7 SWITCH SELF TEST...

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