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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Search the history of over billion web pages on the Internet. Full text of ” Lexicon: However, you should observe the same reasonable precautions that apply to any piece of audio equipment: If not installed and used in accordance with the instruction manual, it may cause interference to radio communications. 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.

The Federal Communications has prepared a booklet which you may find useful: No part of it may be reproduced ortransmitted by any means or in any form, without express prior consent in writing from Lexicon.

Parts List 7. Schematics and Assembly Drawings. Flashes to indicate that the system is under external control. Used also to indicate results of diagnostic tests or per- formance of internal MIDI button and status Indicator. Accepts power from the supplied power pack.

Input impedance is 50 kilohms in stereo, and 25 kilohms in mono. The LXP-1 must be used only with the supplied power pack. Voltage requirements are printed on the power pack.

The LXP-1 has no power switch — it can be left on all the time. 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.

Under normal conditions the LXP-1 requires minimal maintenance. Use a soft, lint-free cloth slightly dampened with warm water and a mild detergent to clean the exterior surfaces of the unit.

Do not use alcohol, benzene or acetone-based cleaners or any strong commercial cleaners. Avoid using abrasive materials such as steel wool or metal polish. If the unit is exposed to a dusty environment, a vacuum or low-pressure blower may be used to remove dust from the LXP-1 exterior.

Verify that all pots, the MIDI momentary push button and the position rotary switches operate smoothly and correctly. Verify that all screws and rear panel lexivon are secure. Inspect the external AC power transformer for any signs of physical damage. 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.

As the MIDI button is released, the selected test is initiated. Generally, the test action is performed once and the results are displayed immediately. If the selected test is successful, the red MEM LED located on the far right side of the front panel will lrxicon at a rate of approximately 6 Hz. Turning the knob clockwise will increment the position number by one.


When selected, both red LEDs will blink in unison at a rate of approximately 2 Hz until the next test selection is made.

Calculates the ROM checksum and compares it to the stored value. It operates identically to the RAM test on Position 2. Checks the interrupt timing by comparing it to coded timing loops.

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

Checks the MIDI serial port transmit and receive functions. To prepare the LXP-1 for this test, perform the the following: Move internal jumper location at W3 to W2. Connect a MIDI cable from the jack labeled: When this procedure has been completed the test may be executed. This test takes approximately 5 seconds and the results will be displayed immediately upon completion. This test takes approximately 30 seconds and the results will be displayed immediately upon completion.

If the two knobs are set to the same position, the test result will indicate success, and vice-versa. If the two differ, a failure will result, indicating that a RAM storage failure may have occurred.

If the test does not succeed when repeated, there may be a RAM hardware malfunc- tion.

The last operation is the storage of zeros in all locations. The success signal indicates that the RAM passed the diagnostic test and that zeros have 11 stored in all memory locations. The combination is as follows: Position “0” refers to a 6 o’clock knob position.

Lexicon LXP-1 Manuals

If any mnual is performed incorrectly, a failure signal alternately flashing red LEDs will be lexidon and the procedure must be repeated from the beginning. Position 1 3 CHORUS 2 Loads a program which tests the specifications of the converter circuitry by Audio Test mode producing a digitally processed output signal which is identical to the input signal. This test program will run continuously until another function is selected.

The pc board should now slide out towards the front of its case, allowing easy access to the circuitry. CW refers to a clockwise knob setting and CCW refers to a counter-clockwise setting. A Control Knob Input Level: B Control Knob Input Level: C Control Knob Input Level: Measure output level on right channel output. Acceptable output level should measure between Swap all right and left channel audio connections sind repeat steps 1. Audio input cable from Low Distortion Oscillator output to left channel input 2.

Audio output cable from right channel output to Level Meter input 4. Audio terminator plug to left channel output Procedure 1.

Measure Right channel output level. Swap all right and left channel audio connections and repeat steps 1. Audio input cable from Low Distortion Oscillator output toright channel input 2.

Audio input cable from Low Distortion Oscillator output to right channel input 2. Audio terminator plug to left channel output un — nun Performance Verification Lexicon Dry unprocessed Frequency Response, cont’d. Set Level Meter to measure right channel output as the 0 dB reference. Sweep from 20 Hz to 20kHz.


Swap right and left channel audio connections and repeat steps 1. Audio input cable from Low EHstortion Oscillator output to right channel input 2.

Apply a 1 kHz signal at dBV 56mVrms to right channel input. Set Level Meter to measure the right channel output as the 0 dB reference. Sweep from 20 Hz to 15kHz. Apply a 1 kHz signal at dBV 32mVrms to right channel input. OluF capacitor is connected across the AC input to reduce noise spikes from the line voltage input. A voltage divider circuit incorporating CR4, R13 and Rll, divides down the unregulated supply level to be used as a monitor voltage on the Schmidt inverter input ofUl pin 5.

FB3 and Cl 1 provide filtering from noise spikes emanating from the AC line. An R-C circuit provides a delay in the removal of Reset during power up to allow regulated supply levels to stabilize before enabling the processor circuitry. R2 and C4 provide this power up Reset delay. A protection diode CR2 allows an added discharge path for C4 during power down conditions. Ql, which is driven by U1 pin 6 output, is the R-C delay circuit driver.

It produces a fast C4 discharge time for Reset enable and goes to a high impedence state producing the R-C delay on Reset disable. This inverter pin 2 output ZRST drives three separate reset circuits; 1. Z80 Reset which requires an inverter to produce an active low Reset for the Z This insures that the Z80 is the last device enabled and that all other devices will be in an active known state after Z80 Reset is removed.

The removal of VCC causes Q4 to shut off. Q5 controls U9 Lexiicon pin Under normal power on conditions, Q5 will conduct, maintaining an active high on CE2. Both jack inputs are shorted together, allowing a single input source to be applied to left and right input circuitry.

This permits the summing circuit R56, 57 and 58 to function properly for single-ended input signals. Inputs are DC isolated by lOuF non-polarized coupling capacitors. A dual op amp U30 performs this preamp function by providing the initial gain and buffering for the Left and Right input signals.


First, however, it is coupled into U32, a 15kHz low pass filter. The pin 1 output of U31 is applied to the converter Sample and Hold circuit described below.

Pin 1 of U31 is also coupled through a lOK ohm resistor R63 into the signal detect circuit. The audio output current from the Pre-Emphasis circuit develops a voltage across storage capacitor C C63 will then hold its sample of the audio input while the Analog to Digital conversion is per- formed. It converts 16 Bit data latched into it from the Lexichip into an analog voltage level see Data to Voltage chart below.