Audiocom NFL-2002 Manuale di istruzioni per l'uso - Pagina 3

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APPENDIX A

OPTIONAL FOOTBALL MODIFICATIONS

GENERAL DESCRIPTION

In Audiocom

Intercom Systems, the Mic-Kill feature is used to turn off any activated

microphones on a selected channel. The Mic-Kill feature is activated when the beltpack

receives a 24 kHz signal from the channel. In some applications the Mic-Kill and Call

signal features are not desired and need to be disabled.

ELIMINATING MIC-KILL AND CALL SIGNAL

CAUTION: TO PREVENT DAMAGE TO THE EQUIPMENT, THESE MODIFICATIONS

SHOULD ONLY BE MADE BY QUALIFIED TECHNICIANS.

If desired, the Mic-Kill and Call signal features can be disabled in the NFL-2002 by

removing a surface-mounted capacitor from the printed circuit board. Perform the

following:

1. Before making changes to the printed circuit board, disconnect all power and line

connections from the beltpack.

2. Refer to Figure 3 and locate C61 on the underside of the printed circuit board.

3. Remove capacitor C61 from the printed circuit board.

RESTORING MIC-KILL AND CALL SIGNAL

To restore the Mic-Kill and Call signal features, replace C61 with Telex

102881-140, 1500 pF, 50V capacitor.

part number

Introduction

®1

The Audiocom

NFL-2002 is a microprocessor controlled two-channel

intercom beltpack. An internal switch and jumper setting allows the unit to be

used with Clear-Com

®2

components, if desired. Other internal switch and

jumper settings allow the unit to be uniquely configured to the operator's

requirements.

OPERATION

SYSTEM POWER

The NFL-2002 beltpack receives power externally in one of two ways:

• The intercom channel

• The local-power (pin 2) of the intercom channel connector

INITIAL NFL-2002 SETUP

The channel termination is initially set for balanced operation, which is

compatible with other Audiocom

equipment. If the unit is going to be

connected to Clear-Com equipment, one switch must be changed as

described on page 11.

The headset is auto-sensing which means the unit automatically determines if

an Electret or Dynamic headset is attached to the unit.

1. Audiocom

is a registered trademark of Telex Communications, Incl., Burnsvilled, MN 55337

2. Clear-Com

is a registered trademark of Clear-Com Intercom Systems.