LEXICON LXP 1 MANUAL PDF
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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If the test does not succeed when repeated, there may be a RAM hardware malfunc- tion. If the selected test is successful, the red MEM LED located on the far right side of the front panel lecicon flash at a rate of approximately 6 Hz. Trace this input pulse out from U3 pin 15 to the U1 inverter pin 8 and 9. This charges storage capacitor C41 or 52 depending on the channel being output to the DAC output level.
Swap right and left channel audio connections and repeat steps 1. It converts 16 Bit data latched into it from the Lexichip into an analog voltage level see Data to Voltage chart below.
Full text of “Lexicon: lexicon lxp 1 sm”
Verify that all pots, the MIDI momentary push button and the position rotary switches operate smoothly and correctly. This allows both outputs to be present when only one LXP-1 output is used by summing left and right singlas together. This test program will run continuously until another function is selected. This user control determines the signal level applied to the final output Buffer stage U IUF X77 C26 0. Unit is occasionally dead on power up. To prepare the LXP-1 for this test, perform the the following: Accepts power from the supplied power pack.
Occasional oscillations and noise appear on output, even while manuao idle, and disappear when a new program is selected. When selected, both red LEDs will blink in unison at a rate of approximately 2 Hz until the ldxicon test selection is made.
The pin 1 output of U31 is applied to the converter Sample and Hold circuit described below. 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.
Parts List 7. DAC output is compared to analog input by the comparator.
IUF C64 4 O. Move internal jumper location at W3 to W2. 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. Qosed condition enables defeat mode. The combination is as follows: Units in the field should have lexifon capacitor populated if they exhibit the following s Tnptoms; 1.
LEXICON LXP-1 Manuals
This permits the summing circuit R56, 57 and 58 to function properly for single-ended input signals. As the MIDI button is released, the selected test is initiated. Connect a MIDI cable from the jack labeled: SI is connected to a pullup resistor in RP2. It has been tested and found to comply with the limits for a Class A computing device pursuant lxicon Subpart J, Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment.
LEXICON LXP-1 Owner’s Manual
It operates at a Input impedance is 50 kilohms in stereo, and 25 kilohms in mono. Generally, the test action is performed once and the results are displayed immediately. The circuit board lexocon out of the box with the front panel attached. This test takes approximately 30 seconds and the results will be displayed immediately upon completion.
Apply a 1 kHz signal at dBV 56mVrms to right channel input. 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. IUF C46 4 o. 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. Check all power rails with a scope or multimeter.
IUF C59 4 O. Every nine clock pulses, RCO pin 15 will go high in order to lwxicon an interrupt routine on lx; Z80 processor. This is the heartbeat interrupt for the software operating system. Verify that all screws and rear panel jacks are secure.
Installing a 33pf ceramic bypass capacitor in C21 position can eliminate oscillator startup and intermittent failures.
CW refers maanual a clockwise knob setting and CCW refers to a counter-clockwise setting. When pressed, a low state is produced on pin 11 of U7. The analog signal can be traced though the converter drcutry by running the Audio Test Lexicln program. Set Level Meter to measure right channel output as the 0 dB reference.
Apply a 1 kHz signal at dBV 32mVrms 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.
It operates identically to the RAM test on Position 2. To keep the power plug from working loose from the rear of the unit during travel, lexicoj may wish to apply a small amount of silicone sealer to the plug after inserting it. Search the history of over billion web pages on the Internet. Inputs are DC isolated by lOuF non-polarized coupling capacitors.
Schematics and Assembly Drawings.