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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Verify that all screws and rear panel jacks are secure. Apply a 1 kHz signal at dBV 56mVrms to right channel input.

No part of it may be reproduced ortransmitted by any means or in any form, without express prior consent in writing from Lexicon. Swap right and left channel audio connections and repeat steps 1.

This charges storage capacitor C41 or 52 depending on the channel being output to the DAC output level. C63 will then hold its sample of the audio input while the Analog to Digital conversion is per- formed. Apply a 1 kHz signal at dBV 32mVrms to right channel input. Search the history of over billion web pages on the Internet. This test program will run continuously until another function is selected. Verify that all pots, the MIDI momentary push button and the position rotary switches operate smoothly and correctly.

Set Level Meter to measure the right channel output as the 0 dB reference. IUF X77 C26 0. The output voltage from U22 is either deglitched and applied to audio output circuitry, or compared to sampled input level by the comparator U23 for analog to digital conversion. Audio input cable from Low EHstortion Oscillator output to right channel input 2. Diagnostic test programs are selected by adjusting the Program Select knob the third knob from the right on the front panel to one of its 15 assigned positions, then pressing and releasing the MIDI button.

First, however, it is coupled into U32, a 15kHz low pass filter. Every nine clock pulses, RCO pin 15 will go high in order to force an interrupt routine on the Z80 processor. Occasional oscillations and noise appear on output, even while sitting idle, and disappear when a new program is selected.


It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J, Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment. Audio input cable from Low Distortion Oscillator output to right channel input 2.

Pin 1 of U31 is also coupled through a lOK ohm resistor R63 into the signal detect circuit. C Control Knob Input Level: IUF C47 4 0. Trace this input pulse out from U3 pin 15 to the U1 inverter pin 8 and 9.


A full description and timing diagram of DAC control circuitry is explained in the Lexichip section of this manual. The front panel push button and Lexicom select switch are exercised thoughout the diagnostic testing.

Turning the knob clockwise will increment the position number by one.

Calculates the ROM checksum and compares it to the stored value. Set Level Meter to measure right channel output as the 0 dB reference.


Processing of data and instructions to and from the UART 2. It produces a fast C4 discharge time for Reset enable and goes to a high impedence state producing the R-C delay on Leicon disable. Move internal jumper location at W3 to W2. Under normal power on conditions, Q5 will conduct, maintaining an active high on CE2.

If diagnostics cannot be selected and executed proj? The user control varies the wiper position of R39 in order to control the percentage of Wet processed and Dry unprocessed signals on LXP-1 outputs.

A dual op amp U30 performs this preamp function by providing the initial gain and buffering for the Left and Right input signals. Do not use alcohol, benzene or acetone-based ,xp or any strong commercial cleaners. U27 outputs are applied to one end of one of the ganged linear 50k ohm pots R Under normal conditions the LXP-1 requires minimal maintenance.


A lkHzdB audio signal can be applied to inputs, and the signal can be traced into and out of the converter. The circuit board slides out of the box with the front panel attached. This test takes approximately 5 seconds and the results will be displayed immediately upon completion.

Flashes to indicate that the system is under external control. To keep the power plug from working loose from the rear of the unit during travel, you may wish to apply a small amount of silicone sealer to the plug after inserting it.

Unit is occasionally dead on power up. Many of these programs will identify specific hardware failures within the unit and will be referred to in this section.

LEXICON LXP-1 SM Service Manual download, schematics, eeprom, repair info for electronics experts

If any step is performed incorrectly, a failure signal alternately flashing lexxicon LEDs will be activated and the procedure must be repeated from the beginning. Both jack inputs are shorted together, allowing a single input source to be applied to left and right input circuitry.

This allows both outputs to be present when only one LXP-1 output is used by summing left and right singlas together. The opposite end of the dual pot is nanual to the Right and Left preamp stage outputs. Use a soft, lint-free cloth slightly dampened with warm water and a mild detergent to clean the exterior surfaces of the unit.

IUF C46 4 o.

LEXICON LXP-1 Owner’s Manual

Msnual input cable from Low Distortion Oscillator output toright channel input 2. A familiarization with block diagram and descriptions in the Qrcuit Description section will also be helpful in isolating specific problems.

Accepts power from the supplied power pack.

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