Introduction; Technical Support; Disclaimer - Mackie Digital 8-Bus Service Manual

INTRODUCTION

This manual contains service information for the d8b digital audio mixer. To service the
d8b, technicians should be familiar with op-amp based and discrete analog circuitry,
digital troubleshooting, microprocessors, digital audio, DSP, ESD, ESP, and the operation/
application of mixing consoles. Presentation of this manual does not constitute
endorsement of qualifications by Mackie Designs.
This manual is available in Adobe
Mackie Designs' Digital Service CD-ROM (part# 820-163-00). This is available to all Service
centers authorized to repair the d8b. Also included on the CD-ROM are the schematics,
PCB layouts, parts lists, assembly drawings, some IC data sheets and the owner's
manual.
It is essential that you become familiar with the owner's manual as it contains all of
the operational details, hookup diagrams, specifications and just about everything
d8bwegian. It will be a great help for you to verify customers complaints, and to check
for correct operation.
This service manual does not include an in-depth circuit analysis, rather it provides an
overall guide to details not immediately obvious from the schematics alone. It is
intended to help you troubleshoot down to board level and identify and swap out any
bad circuit boards. Component level troubleshooting down to resistor or IC level, may
be undertaken if time permits, or if there appears to be something obvious.
SERVICE TECHNICAL ASSISTANCE
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.

DISCLAIMER

The information contained in this manual is proprietary to Mackie Designs, Inc. The entire
manual is protected under copyright and may not be reproduced by any means without
express written permission from Mackie Designs Inc.
GETTING STARTED
Upon receiving a d8b for repair, your first impression may be to run screaming into the
night. After reading this overview, checking the schematics, pcb layouts, assembly
drawings, parts lists, having a good look at the owner's manual and inspecting the unit,
you will probably realize that your first impression was correct.
Think of the remote CPU as a standard PC with extra power supplies for the console.
Standard PC troubleshooting techniques and commercially available diagnostic DOS
software can be applied to repair the remote CPU.
In its simplest form, the mixer and the remote CPU are two boxes full of circuit boards,
all joined together with lots of connectors and ribbon cables. A preliminary inspection
will often reveal a simple problem, such as a bad connection somewhere, a loose cable,
a bad switch or control, or the CPU's CMOS settings may need to be reset.
Our technical support team are available to discuss any d8b problems and offer
solutions. If you ever suspect that a customer's complaint is related to the version of
Mackie software they are using, you should consult with your customer and Mackie
Designs before downloading the latest software from our website:
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