Lexicon LDD-1 Manuel utilisateur

LDD-1

AC-3/RF Demodulator User Guide

Unpacking and Inspection

Save all packing materials in case you ever need to ship the unit. Thoroughly inspect the unit and packing materials for signs of damage.

Report any shipment damage to the carrier at once; report equipment malfunction to your dealer.

Precautions

Save these instructions for later use.

Follow all instructions and warnings marked on the unit.

Always use with the correct line voltage. Refer to the manufacturer's operating instructions for power requirements. Be advised that different operating voltages may require the

use of a different line cord and/or attachment plug.

Do not installthe unit in an unventilated rack, ordirectly above heat producing equipment such as power amplifiers. Observe the maximum ambient operating temperature listed

in the product specification.

Slots and openings on the case are provided for ventilation; to ensure reliable operation and prevent it from overheating, these openings must not be blocked or covered. Never

push objects of any kind through any of the ventilation slots. Never spill a liquid of any kind on the unit.

This product is equipped with a 3-wire grounding type plug. This is a safety feature and should not be defeated.

To prevent shock or fire hazard, do not expose the unit to rain or moisture, or operate it where it will be exposed to water.

Do not attempt to operate the unit if it has been dropped, damaged, exposed to liquids, or if it exhibits a distinct change in performance indicating the need for service.

This unit should only be opened by qualified service personnel. Removing covers will expose you to hazardous voltages.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This triangle, which appears on your

component, alerts you to the pres-

enceofuninsulated,dangerousvolt-

age inside the enclosure... voltage

that may be sufficient to constitute a

risk of shock.

Thistriangle,whichappearsonyour

component, alerts you to important

operating andmaintenanceinstruc-

tions in this accompanying litera-

ture.

Acknowledgements

The CP and DC Series are manufactured under license from Dolby Laboratories Licensing Corporation. Additionally licensed under one or more of the following patents: U.S.

numbers 3,632,886, 3,746,792 and 3,959,590; Canadian numbers 1,004,603 and 1,037,877. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing

Corporation.

Lexicon Inc. • 3 Oak Park • Bedford MA 01730-1441

Telephone 617-280-0300 • Fax 617-280-0490

Congratulations on your purchase of the Lexicon LDD-1. The LDD-1 is designed to interface between

a laser disc player (with an AC-3/RF output), and any Dolby Digital decoder which accepts a standard

AC-3signal(likeour DC-1). Because“AC-3ready” laserdisc playersuseaseparateRadio Frequency

(RF) modulated output to carry the Dolby Digital information, special considerations must be made.

Whilethis typeof transmissionworksperfectlywell,our engineerswererightfullyreluctantto injectline-

level RF directly into the meticulously designed DC-1. The solution is the LDD-1.

The LDD-1 keeps potential RF interference away from the sensitive preamp/processor stage while

providing highly useful improvements in AC-3 signal quality. By placing the requisite demodulation

circuitry in its own enclosure with dedicated power supplies and grounding, the potential to degrade

digital-to-analog conversion and analog audio signals within the preamp/processor is eliminated.

The LDD-1 incorporates fully automated “intelligent” switching between S/PDIF and AC-3/RF inputs,

meaning that any laser disc will be decoded to its maximum inherent quality. A low voltage “turn on

trigger”input andoutput areincludedforinterconnectionto theLexicon DC-1andNTSeriesAmplifiers.

The stringently designed outboard power supply ensures maximum signal purity.

We have designedthis manual toprovide a briefoverviewof the demodulator,as wellas to providethe

information necessary for safe installationand operation. We trustthat the time youinvest in reviewing

these brief instructions will be rewarded by the best possible performance and longevity of your

equipment.

Introduction

LDD-1

AC-3/RF Demodulator User Guide

LOCK

This LED will light whenever the unit

sensesanAC-3/RFsignal.Whennosuch

signal is present, the LED will remain off,

and the INPUT SELECT LED will light.

POWER

This LED willlight whenever power to

the unit is supplied and enabled.

INPUT SELECT

2-position switch for selection of the type of NON-AC-3/

RF digital output you are using from your laser disc

player.

NOTE: When power is off, the LDD-1 automatically

outputs the COAXial digital input. Front Panel

LD OPTIMIZATION

3-position switch which minimizes signal errors, pro-

viding optimal timing for specific brands of laser disc

players.

Recommended Settings

High Panasonic, Pioneer CLD-97 (MSB modified

version), Runco

Low Denon, Enlightened Audio Designs, Pioneer

LD-S2 (MSB modified version)

Normal Marantz, Mitsubishi, McIntosh, MSB, Theta,

Pioneer (including Elite), Yamaha

OUTPUT

ConnectthisS/PDIFoutputtoDC-1digitalinputCOAX1

with a 75Ωcoaxial cable.

POWER

Connect the AC adapter here. Use onlythe supplied Lexicon

MSA AC adapter.

INPUT

Connect a 5-pin DIN cord (not supplied)

from this input to the DC-1 PWR CTL

Output.Thisallowsthe LDD-1 to poweron

and off withthe DC-1. If nothing is hooked

up here, the unit will turn on whenever the

AC adapter is supplied power. This set-up

allows use of a switched outlet or continu-

ous power. (As power consumption and

heat generation are both minimal, this will

not harm the LDD-1.)

S/PDIF INPUTS

Connectthisinputtothelaserdiscplayer’sNON-AC-3digital

output using the appropriate 75Ωcoaxial cable.

Becauseyoucanswitchbetweenthese inputsfrom thefront

panel, you may use both; which gives you an extra digital

input.

LOOP THRU

Allowsthehook-upand powercycling of addi-

tional components such as the Lexicon NT

Series of power amplifiers. Refer to the DIN

configuration diagram below.

RF IN

Connect this input to the laserdisc player’s RF/AC-3

output with a 75Ωcoaxial cable. Keep this cable as

short as possible to minimize RF interference.

Connections between the LDD-1 and associated

equipment should be made with all units UNPLUGGED! Rear Panel

1 = Ground

2 = Ground

3 = Power On (constant

when the DC-1 is On)

4 = Unused

5 = Trigger(programmable)

Setup

The LDD-1 chassis is barely four inches deep to allow it to be positioned adjacent to an AC-3-capable

player’s RF output. This minimizes the requiredRF-signal cable length to reduce any RFinterference.

As the unit uses automated switching, and draws very little power, you can literally set it and forget it.

To set up the LDD-1:

• Connect a 75Ωcoaxial cable between the LDD-1 rear panel RF (AC-3) input and the laser disc

player's RF/AC-3 output. Keep this cable as short as possible to minimize RF interference.

• Connect a 75Ωcoaxial (or optical) cable between the LDD-1 S/PDIF input and the laser disc

player's digital output.

• Connecta75Ωcoaxialcablebetwenthe LDD-1S/PDIFoutputandtheDC-1COAX1digitalinput.

•Recommended:Connecta5-pinDINcord (notsupplied)betweentheLDD-1 PWRCTLinputand

the DC-1 PWR CTL output. This allows the LDD-1 to power on and off with the DC-1. If this

connection is not made, the LDD-1 will turn on whenever its AC adapter is supplied power.

•Optional: Connect anyadditional components which allow remoteturn on(such as Lexicon's NT

Series of power amplifiers) to the LDD-1 rear panel PWR CTL (LOOP THRU) connector.

• Connect the AC adapter provided to the POWER jack.

Once the LDD-1 is properly connected, set the front panel INPUT SELECT switch for theappropriate

type of NON-AC-3/RF digital output you are using on your laser disc player. (Most laser disc players

haveonlyone.)SettheLDOPTIMIZATIONswitchaccordingtothechartprovidedonpage2.Onceyou

have completed the connections and setting of the front panel switches, all functions are performed

automatically. LEDs on the front panel are provided to identify the operational state.

TheLDD-1requiresnomaintenance. However,itisgoodelectricalpracticetocleanallconnectorsonce

a year. Clean the exterior surfaces of the unit with a soft, lint-free cloth, dampened with warm water. Maintenance

Specifications

Lexicon Part # 070-11659 Rev 1 Printed in U.S.A.

Lexicon Inc.

3 Oak Park

Bedford MA 01730-1441

Telephone617-280-0300

Fax 617-280-0490

Inputs 2: 1AC-3/RF via COAX; 2 Digital (1 COAX; 1 Optical)

Outputs One (1) Digital via COAX

Optimization 3-position toggle switch, decoder pulse settings

Controls and Indicators LEDs indicate operational status

Toggle switches for: LD Optimization: High, Low, Normal; Input Select: Optical, COAX

Connectors Inputs: 4: 2 RCA (COAX); 1 TOSLINK (Optical); 1 5-pin DIN (PWR CTL)

Outputs: 2: 1 RCA (COAX); 1 5-pin DIN (PWR CTL Thru)

Power connector: 2.5mm, 9VAC, 1A

General Dimensions: 17.0"X x 1.75"H x 4"D

Weight: 2.4 lbs net; 4.4 lbs shipping

Power Requirements: 120VAC, 60Hz or 230VAC, 50Hz. Use Lexicon MSA AC Power Adapter.

Rack mount adapters are available through your Lexicon dealer.

All specifications subject to change without notice.

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