User manual LEXICON LDD-1

[. . . ] 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. [. . . ] 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-3 signal (like our DC-1). Because "AC-3 ready" laser disc players use a separate Radio Frequency (RF) modulated output to carry the Dolby Digital information, special considerations must be made. While this type of transmission works perfectly well, our engineers were rightfully reluctant to inject linelevel RF directly into the meticulously designed DC-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 and output are included for interconnection to the Lexicon DC-1 and NT Series Amplifiers. The stringently designed outboard power supply ensures maximum signal purity. We have designed this manual to provide a brief overview of the demodulator, as well as to provide the information necessary for safe installation and operation. We trust that the time you invest in reviewing these brief instructions will be rewarded by the best possible performance and longevity of your equipment. Introduction 1 NOTE: When power is off, the LDD-1 automatically outputs the COAXial digital input. Front Panel POWER This LED will light whenever power to the unit is supplied and enabled. LOCK This LED will light whenever the unit senses an AC-3/RF signal. When no such signal is present, the LED will remain off, and the INPUT SELECT LED will light. 2 LD OPTIMIZATION 3-position switch which minimizes signal errors, providing optimal timing for specific brands of laser disc players. Recommended Settings High Low Normal Panasonic, Pioneer CLD-97 (MSB modified version), Runco Denon, Enlightened Audio Designs, Pioneer LD-S2 (MSB modified version) Marantz, Mitsubishi, McIntosh, MSB, Theta, Pioneer (including Elite), Yamaha 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. 2 Connections between the LDD-1 and associated equipment should be made with all units UNPLUGGED! Rear Panel POWER Connect the AC adapter here. Use only the supplied Lexicon MSA AC adapter. RF IN Connect this input to the laserdisc player's RF/AC-3 output with a 75 coaxial cable. Keep this cable as short as possible to minimize RF interference. OUTPUT Connect this S/PDIF output to DC-1 digital input COAX1 with a 75 coaxial cable. INPUT Connect a 5-pin DIN cord (not supplied) from this input to the DC-1 PWR CTL Output. This allows the LDD-1 to power on and off with the 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 continuous power. (As power consumption and heat generation are both minimal, this will not harm the LDD-1. ) LOOP THRU Allows the hook-up and power cycling of additional components such as the Lexicon NT Series of power amplifiers. Refer to the DIN configuration diagram below. 1 = Ground 2 = Ground 3 = Power On (constant when the DC-1 is On) 4 = Unused 5 = Trigger (programmable) S/PDIF INPUTS Connect this input to the laserdisc player's NON-AC-3 digital output using the appropriate 75 coaxial cable. Because you can switch between these inputs from the front panel, you may use both; which gives you an extra digital input. 3 4 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. [. . . ] Connect the AC adapter provided to the POWER jack. Setup · · Once the LDD-1 is properly connected, set the front panel INPUT SELECT switch for the appropriate type of NON-AC-3/RF digital output you are using on your laser disc player. (Most laser disc players have only one. ) Set the LD OPTIMIZATION switch according to the chart provided on page 2. Once you 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. The LDD-1 requires no maintenance. [. . . ]