ALESIS EC-2 - Manual (Page 5)

appendix A • EC-2 96kHz A/D/D/A upgrade
EC-2 Manual A-3
Installing the EC-2 into the HD24
Precautions
The EC-2 boards should only be installed by a
dealer or trained technician. End users
should only attempt installation if they have
experience with this type of procedure. If
any of the following instructions are not clear
to you, please have a dealer or trained
technician install it for you. Improper
installation by the end user may damage the
boards and/or your HD24 and may void
your warranty.
Packing List
In the EC-2 box, you should find the following
items:
• This manual (P/N 7-51-0107, E2 User’s Manual)
• 96 kHz Analog Input board (P/N 9-40-0256, E2
A/D PCB)
• 96 kHz Analog Output board (P/N 9-40-0257,
E2 D/A PCB)
• Daughterboard (P/N 9-40-0258, E2 D/D PCB)
• DC power cable (P/N 4-74-0031, E2 DC Power
Cable)
Before you begin, verify that you have everything
in this packing list. When you unwrap the
components, save the packing materials so you can
use them to store the original parts.
Overview
In the HD24, the conversion between analog and
digital signals takes place on two PCBs (printed
circuit boards) that are mounted directly to the
input (A/D) and output (D/A) connectors that poke
through the back panel. In a “stock” HD24 without
96 kHz sampling capability, each card connects
directly to the main PCB on the bottom of the unit
with a ribbon cable.
To add 96kHz analog recording and playback
capability, both the input and output boards are
completely replaced, and another board (the
daughterboard) is added bridging across them. The
daughterboard then connects via ribbon cables to
the main PCB. The daughterboard requires a
connection to the power supply, so the existing 4-
connector power cable must be replaced with a new
5-connector power cable.
Tools required
Before you begin, have these tools ready:
• #2 Philips-head screwdriver
• 14 mm nut driver or socket wrench