LXP -1 Owner’s Manual. 1. Installing the LXP Specifications. The following specifications are subject to change without notice. Frequency Response. View and Download LEXICON LXP-1 owner’s manual online. Multi-effect processing module. LXP-1 Recording Equipment pdf manual download. Lexicon LXP-1 Pdf User Manuals. View online or download Lexicon LXP-1 Owner’s Manual, Manual.
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IUF C47 4 0. OluF capacitor is connected across the AC input to reduce noise spikes from the line voltage input. If any step is performed incorrectly, a failure signal alternately flashing red LEDs will be activated and the procedure must be repeated from the beginning.
LEXICON LXP-1 Manuals
Search the history of over billion web pages on the Internet. Checks the MIDI serial port transmit and receive functions. Both jack inputs are shorted together, allowing a single input source to be applied to left and right input circuitry.
This test program will run continuously until another function is selected. If the test does not succeed when repeated, there may be a RAM hardware malfunc- tion.
The circuit board slides out of the box with the front panel attached. Check all power rails with mqnual scope or multimeter. Audio terminator plug to left channel output Procedure 1.
The front panel push button and Program select switch are exercised thoughout the diagnostic testing. Set Level Meter to measure right channel output as the 0 dB reference. IUF C43 4 O.
Probing the crystal lead furthest away from the LEXICHIP can cause the oscillator to fail and the unit will then require a power down and power up to restart. To prepare the LXP-1 for this test, perform the the following: Under normal power on majual, Q5 will conduct, maintaining an active high on CE2. No part of it may be reproduced ortransmitted by any means or in any form, without express prior consent in writing from Lexicon.
lexicin Acceptable output level should measure between IUF C53 4 O. Units in the field should have his capacitor populated if they exhibit the following s Tnptoms; 1. When pressed, a low state is produced on pin 11 of U7. Measure Right channel output level. This short is disconnected when plugs are connected to both outputs allowing for the full stereo effect to be utilized.
The opposite end of the dual pot is connected to the Right and Left preamp stage outputs. This test takes approximately 5 seconds and the results will be displayed immediately upon completion.
LEXICON LXP-1 Owner’s Manual
A thorough visual inspection of a malfunctioning unit once opened is good troubleshooting practice. A lkHzdB audio signal can be applied to inputs, and the signal can be traced into and out of the converter. A dual op amp U30 performs this preamp function by providing the initial gain and buffering for the Left and Right input signals.
Set Level Meter to measure the right channel output as the 0 dB reference. Generally, the test action is performed once and the results are displayed immediately. DAC output is compared to analog input by the comparator.
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Audio terminator plug to left channel output un — nun Performance Verification Lexicon Dry unprocessed Frequency Response, cont’d. Verify that all screws and rear panel jacks are secure.
Processing of data and instructions to and ledicon the UART 2. If noiseispresentonbothwetanddry signalscheckthesupplyrails and trace the audio signal through the analog circuitry.
LEXICON LXP-1 OWNER’S MANUAL Pdf Download.
A familiarization with block diagram and descriptions in the Qrcuit Description section will also be helpful in isolating specific problems. U27 outputs are applied to one end of one of the ganged linear 50k ohm pots R The analog signal can be traced though the converter drcutry by running the Audio Test Loop program. When this procedure has been completed the test may be executed. Move internal jumper location at W3 to W2. It converts 16 Bit data latched into it from the Lexichip into an analog voltage level see Data to Voltage chart below.
Apply a 1 kHz signal at dBV 56mVrms to right channel input. Swap right and left channel audio connections and repeat steps 1.