Telex 1505 service manual Table of Contents, Optional Features include, Inspection

		Table of Contents
1.	General	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.	Standard Features	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.	Installation	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4.	Connections	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.	Operation	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.	Theory of Operation	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.	1505 Specifications	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.	Parts List	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. General

The Vega Model 1505 Audio Line Driver is a general purpose card that provides a reliable means of remotely controlling a variety of cus- tomer specified devices. The card is flexible. It can perform basic switching functions, custom- ized switching functions (via jumpers), or spe- cial user-defined functions. It plugs into a Tellabs Type 10 or equivalent open frame rack and can be used in conjunction with any re- mote control console.

2.Standard Features

•Four balanced line inputs, switchable

•Four single-ended inputs, switchable

•One microphone input from front panel or connector

•Jumper options for carbon, electret, or dy- namic microphone elements

•Four balanced 600-ohm line outputs

•One-watt eight-ohm speaker output

•12 Vdc operation

•All receive inputs can be individually muted by rear panel switch low inputs

2.1Optional Features include:

•Jumper-selected receive input compression

•User switch-programmable mixing function, for example one input can be switched to any or all outputs

•Jumper selectable 600 ohm or 10K ohm high input impedance

3. Installation

Caution - ESD Sensitive

This piece of electronic equipment con- tains electronic components known to be susceptible to Electro-Static Discharge (ESD). Precautions have been taken to avoid the effects of ESD, however the user is encouraged to promote safe handling techniques in the handling, storage and service of this equipment.

3.1 Introduction

Only experienced technicians familiar with similar types of equipment should attempt to install the 1505. Only basic hand tools are re- quired to remove the card, change jumper set- tings, connect phone, signal, and power lines. Read this section thoroughly before attempting to install the card. Exercise care to prevent wir- ing errors and equipment damage.

3.2 Inspection

Carefully unpack the equipment and inspect it thoroughly as soon as possible after delivery. If any part of the equipment has been damaged in shipment, report the extent of the damage to the transportation company immediately.

This unit has been inspected and adjusted to its recommended operation condition at the fac- tory. Unless it has been handled roughly in shipment, abused or tampered with, it won’t re- quire further adjustments. Simply make the in- stallation connections as described in the fol- lowing sections.

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