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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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Q5 controls U9 CE2 pin B Control Knob Input Level: 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 Used also to indicate results of diagnostic tests or per- formance of internal MIDI button and status Indicator. 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.

Audio output cable from right channel output to Level Meter input 4.

The removal of Lxo causes Q4 to shut off. Generally, the test action is performed once and the results are displayed immediately. A Control Knob Input Level: Under normal power on conditions, Q5 will conduct, maintaining an active high on CE2. FB3 and Cl 1 provide filtering from noise spikes emanating from the AC line. This allows both outputs to be present when only one LXP-1 output is used by summing left manyal right singlas together.

However, you should observe the same reasonable precautions that apply to any piece of audio equipment: Sweep from 20 Hz to 15kHz. C63 will then hold its sample oxp the audio input while the Analog to Digital conversion is per- formed. If the unit is exposed to a dusty environment, a vacuum or low-pressure blower may be ,anual to remove dust from the LXP-1 exterior. This charges storage capacitor C41 or 52 depending on the channel being output to the DAC output level.

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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.

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As the MIDI button is released, the selected test is initiated. Both jack inputs are shorted together, allowing a single input source to be applied to left and right input circuitry. 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.

This test takes approximately 5 seconds and the results will be displayed immediately upon completion.

LEXICON LXP-1 Manuals

The LXP-1 has no power switch — it can be left on all the time. It performs tiie following functions: Connect a MIDI cable from the jack labeled: Position “0” maual to a 6 o’clock knob position.

This determines if the current DAC output is equal to the sampled input, if not, a new data value is latched out to the DAC for comparison. First, however, it is coupled into U32, a 15kHz low pass filter. Measure output level on right channel output.

Check for loose ICs, damaged jacks and controls, overheated or burnt parts and damaged PC board traces. A familiarization with block diagram and descriptions in the Qrcuit Description section will also be helpful in isolating specific problems. Handling of user data input from digital user controls 4. Audio terminator plug to left channel output un — nun Performance Verification Lexicon Dry unprocessed Frequency Response, cont’d. Use a soft, lint-free cloth slightly dampened with warm water and a mild detergent to clean the exterior surfaces of the unit.

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Processing of data and instructions to and from the UART 2.

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

IUF C43 4 O. Parts List 7. The combination is as follows: This inverter pin 2 output ZRST drives three separate reset circuits; 1.

The analog signal can be traced though the converter drcutry by running the Audio Test Loop program. The dual op amp U26 provides unity gain and buffers the Mix and output level pots from the unit output. IUF C47 4 0. 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 cleaners or any strong commercial cleaners. 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.

Set Level Meter to measure right channel output as the 0 dB reference. It converts 16 Bit data latched into it from the Lexichip into an analog voltage level see Data to Voltage chart below.

This will cause all converter logic curcuitry to freeze, resulting in no wet output signal. Many of these programs will identify specific hardware failures within the unit and will be referred to in this section.