Alesis Installing the EC-2 into the HD24, Precautions, Packing List, Overview, Tools required

appendix A • EC-2 96kHz A/D/D/A upgrade

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

EC-2 Manual A-3