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Mackie Digital 8-Bus Service Manual

56 input, fully-automated digital mixing console
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56 input, fully-automated digital mixing console.
DIGITAL 8•BUS
™
SERVICE MANUAL
©1999 Mackie Designs Inc.
#820-182-00
D8B
HOME
CLICK HERE to go to the Table of Contents on page 4

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Summary of Contents for Mackie Digital 8-Bus

  • Page 1 56 input, fully-automated digital mixing console. DIGITAL 8•BUS ™ SERVICE MANUAL ©1999 Mackie Designs Inc. #820-182-00 HOME CLICK HERE to go to the Table of Contents on page 4...

  • Page 2: Safety

    C AU TIO N A V IS R IS K O F E L E C T R IC S H O C K D O N O T O P E N R IS Q U E D E C H O C E L E C T R IQ U E N E P A S O U V R IR C A U T IO N : T O R E D U C E T H E R IS K O F A T T E N T IO N : P O U R E V IT E R L E S...
  • Page 3 Additional Safety Information Mackie Designs’ Digital 8•Bus has been tested and conforms to the following standards and directives of the European Council: 73/23/EEC Low Voltage Directive with amendments 91/263/EEC, 89/392/EEC, and 89/336/EEC...

  • Page 4: Table Of Contents

    CONTENTS SAFETY PAGES.......2, 3 INTRODUCTION ..................5 TECHNICAL SUPPORT ................5 DISCLAIMER ....................5 OVERVIEW ....................6 COMPUTER SYSTEM ................... 7 DSP SYSTEM ....................9 USER INTERFACE SYSTEM ................ 11 ANALOG SYSTEMS ................... 13 POWER ....................... 13 DSP SIGNAL FLOW , CLOCKS, MUTE............14 PARTS .......................

  • Page 5: Introduction

    Mackie Designs, Service Technical Assistance, is available 8AM - 5PM PST, Monday through Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to call with any questions and speak with a carefully-calibrated technician. If one is not available, leave a detailed message and a qualified Mackoid will return your call asap.

  • Page 6: Overview

    Flying Faders, Displays The computer runs Mackie’s real time operating system and handles functions normally associated with a PC such as keyboard, mouse, disk drives, video, etc. The DSP system controls all Digital Signal Processing functions in the console. The User Interface system reads and updates the control surface.

  • Page 7: Computer System

    These are all standard PC compatible parts. However, because the drivers are written into the Mackie OS, other similar devices may not be compatible. Also, it should be noted that ‘upgrading’ the processor, RAM, or HDD is of little value as the Mackie OS will not take advantage of it.
  • Page 8 Place the disc in the drive before turning on the Remote CPU. • The computer should start up into DOS from this disc, rather than from the Mackie • Insert any standard DOS diagnostic software and run tests, for example on the hard drive, video card, mother board etc.

  • Page 9: Dsp System

    DSP SYSTEM A simplified block diagram of the DSP system is shown on the next page. At the heart of the system is an Analog Devices ADSP-2181. It acts as the console CPU, and controls all functions and communications within the DSP system. There are 24 proprietary DSP chips to handle the actual audio processing.
  • Page 10 CODEC BOARD -113 ANALOG ANALOG AUDIO AUDIO INPUTS OUTPUTS DSP BOARD -114 WOOP-DEE STATUS LEDS CHIP SELECT LATCH ADSP-2181 IAD0-IAD15 CPU-DSP EPROM A0-A13 TO PC COM-2 D8-D23 UART DSP_TX DSP_RX BACKPLANE BOARD -163 TO BRAIN BOARD AES/EBU CLOCK CLOCK CARD -164 EFFECTS CARD AES/EBU CARD -115 TAPE I/O CARD -119...

  • Page 11: User Interface System

    PIC chip. The PIC chip outputs a copyrighted text string so that the d8b can verify the card is original and Mackie-authorized. Cards in which operating parameters can be varied are controlled via the Brain (UI System). The Brain Board also controls all functions on the DCA board.
  • Page 12 CONTROL SURFACE -120 -121 -122 FADER BOARDS -125 -125 SWITCHES LEDS V-POTS FLYING FADERS x 25 SHIFT SHIFT SHIFT REGISTERS REGISTERS REGISTERS BRAIN BOARD -136 STATUS LEDS LATCHS I/O BUFFERS WHEEL TO VFD ADSP-2181 DRIVER LATCHES CPU-DSP I/O BUFFERS EPROM VU METERS A0-A13 DCA BOARD...

  • Page 13: Analog Systems

    ANALOG SYSTEMS The analog circuits used in the d8b should be familiar to anyone with experience servicing Mackie products. The 12 Mic Pre’s are the same circuit which is used in the SR40•8. The line amps use Mackie’s ‘unity plus’ architecture.

  • Page 14: Dsp Signal Flow , Clocks, Mute

    DSP SIGNAL FLOW The DSP board is the central hub of the signal flow system, the digital signals must find their way to the DSP board, get DSP’d and make their way out again to the big audio ocean. LINK Please take a look at the Block diagrams chapter, especially the diagram on page D3, and the DSP map on the next page.
  • Page 15 DSP map This table shows the data received (DR) and data transmitted (DT) by the DSP board. On a scale of 1 to 10, you will find this table fairly useful. INPUT CABLE JUXT SIG NAME(DSP) CABLE SIG NAME OUTPUT LINE 13+14 CODEC U3 J13-3...

  • Page 16: Connectors

    DSP CONNECTORS Digital data to This is a compilation of all the DSP board’s and from CODEC connectors, mainly showing the data received and transmitted, and clocks. The power and ground pins are not shown here, to make things a little clearer. These can be found in the connectors chapter, or on the schematics.
  • Page 17 CODEC BOARD How it is labeled Analog Analog Connector/pin out of DSP board from DSP The Data transmitted BUS-1 BUS-2 DT_1 J13-1 (DT) from the DSP board is converted to Analog BUS-3 BUS-4 DT_3 J13-5 U152 and split out into its two U252 BUS-5 BUS-6...
  • Page 18 CODEC connectors This is a compilation of all the CODEC board’s connectors, mainly showing the analog inputs, data received and transmitted. The power,ground and clocks are not shown, but they can be found in the connectors chapter, or on the schematics. Analog signals Analog signals coming in from...
  • Page 19 DCA connectors This is a compilation of all the DCA board’s connectors, mainly showing the analog inputs, data received and transmitted. The DCA board receives the analog Buses, Auxes, Mixes and Solos from the Analog signals DSP board, then outputs (under coming in from control by the Brain board) to the CODEC board...
  • Page 20 TAPE CARDS This shows the analog inputs and outputs on the Tape cards. The analog signals go in and out of the rear panel DB25 connectors J101 and J102 respectively. The Tape cards have their own D/A and A/D converters, therefore, only digital signals are passed to and from the DSP board.
  • Page 21 TAPE CARDS continued DIGITAL SIG CARD TO WHAT THE SIGNAL BACKPLANE ANALOG NAME ON BACKPLANE IS CALLED ON TO DSP TAPE OUTPUT TAPE BOARD CONNECTOR THE BACKPLANE CONNECTOR PAIRS AND PIN NO. AND DSP BOARD AND PIN NO. NOTE: All three tape cards 23 AND 24 J20-7,56 DT_8...
  • Page 22 EFFECTS CARDS There are four slots available on the backplane board for Effects cards. They can plug into the backplane connectors J51, J16, J14 and J17. The backplane connectors J21 and J24 transmit and receive data to and from the DSP board.In most cases, the digital signals have the same name on the backplane as appear on the DSP board, but there are a few exceptions, shown in the right hand column of the tables below.
  • Page 23 EXTRA CARD One slot on the backplane is available for an extra digital I/O card, such as the PDI•8. It connects to backplane connector J22 (in the ALT I/O slot). The signals to and from the DSP board pass through backplane connector J48.
  • Page 24 The clock card The clock card generates the main clock signals used throughout the console. On other boards there are a few local clocks used, for example, for the serial Rx and TX connection to the remote CPU. This table shows the signal flow from the clock card to the various boards in the D8B. The clock card fits into connector J23 on the backplane board.
  • Page 25 The clocks The diagram below shows the relationship between the various clock signals generated by the clock card. Mackie Serial Digital Audio Format 24 Bit MSB Left Justified L/R CLK DATA SCLK MCLK Data valid on the falling edge of SCLK...
  • Page 26 MUTE and UNMUTE On the clock card, there is an important Mute/Unmute circuit. It could have been fitted to any board, but it just so happens it was placed on the clock card. Here is the circuit: The UNMUTE and RESET signals come from the DSP board.
  • Page 27 POWER POWER SYSTEM < System Boots DSP > RESET UNMUTE MUTE TIME As the console powers up, the D/A converters are muted on the CODEC board and the TAPE cards. This prevents noise form being heard or recorded on the Analog lines. When the system has finished booting correctly, the all-important UNMUTE signal is sent from the DSP board to this little circuit, and so the D/A converters are unmuted and ready.

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