Service Manual CHAPTER 1 - INTRODUCTION July 24, 2008
SX-48 Page 7
Chapter 1 - Introduction
SX-48 (Signal Exchange 48 Channels)
Fairlight’s SX-48 Signal Exchange unit provides flexible I/O management of both analog and digital
audio inputs and outputs and a packing density of up to 48 channels in a single 2U frame. Each
standard SX-48 frame ships with a MADI I/O card to provide a multiplexed bi-directional signal flow
for each 48 channel unit. Digital signals can be referenced to external AES, Word Clock or Video at
any standard frame rate, including tri-level references when used in a Hi Definition production
environment. If AES inputs are present, any AES input can be used as a reference for the system. The
front panel LED’s provide a clear indication as to the reference currently in use.
Central to the SX-48 design is the ability to flexibly configure units with any combination of up to six
audio I/O cards plus one MADI I/O card in each 2U frame. These cards can provide 8 x channels of
AES EBU I/O with Sample rate conversion, 8 channels of high quality analog inputs and 8 x channels
of Analog outputs. Optional relay protected analog outputs are also available if these channels are
required to connect to analog speakers.
Purpose of this Document
This document explains how to install, configure and test a Fairlight SX-48 audio interface box.
Warning
The SX-48 is an electrical device containing dangerous components and high voltages. Only
competent service technicians should open the box, and then only after turning off the power and
making sure that the unit is properly grounded.
Fitting and Changing Boards
Static Precautions
SX-48 installation may involve fitting of electronic circuit boards. Care must be taken when doing this
to avoid danger to oneself and damage to the equipment.
Please take note that all Fairlight manufactured electronic modules are static sensitive and should be
handled under anti-static conditions. When working on a system always ensure that you have an anti-
static lead connected and that the system is connected to ground through an earth lead.
Never work on the system while powered up unless you are authorized by Fairlight to do so. As a
matter of practice always touch the external chassis of the system before opening the front panel. If
cards are not handled under anti-static procedures your machine may sustain damage which could
either cause a complete failure or may cause intermittent crashes and subsequent system failure.
When handling cards please ensure that they are placed in anti-static bags when not in the system.
For shipment purposes electronic modules should be placed in an anti-static bag and then suitably
surrounded with loose packaging materials in a solid card board box. Cards shipped to Fairlight
without the correct anti-static packaging will have their warranty voided. If you have any enquiries on
this matter please feel free to contact your local Fairlight office or distributor.
Orientation – VERY IMPORTANT
WARNING – incorrect orientation of boards when installing can cause severe damage to the SX-48
unit. Make sure you carefully inspect the picture below before placing boards in the unit.
SX-48 Basics
The SX-48 is a synchronized audio conversion box. It converts as follows:
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