Midi Tests (9) - Lexicon MPX 110 Service Manual

If the test passed, the L & R Level (green) LED's will light.
If the test failed, the L & R Clip (red) LED's will light.
To run the test again, press the STORE button.
To run the test continuously, press the TAP button.
To stop the test from running continuously, press the STORE button.

MIDI TESTS (9)

MIDI Out To MIDI In
This test will verify that the MIDI Input and MIDI Output/Thru circuits are working. The test will transmit data
out of the MIDI OUT jack and will attempt to read the data through the MIDI IN jack. To run this test, a 5 Pin
Male DIN to 5 Pin Male DIN Cable (also known as a MIDI cable) must be connected between the MIDI IN
jack and the MIDI OUT jack. MIDI Input and MIDI Output/Thru comes from the Lexichip3.
When selected, the Binary LED's will read the following:
Edit Bypass
O O
MSB
Pressing the STORE button will execute the test.
When the test is executed the remaining buttons, encoders, ADC Pots and footswitches (2) are inactive,
and all Front Panel LED's will go off.
If the test passed, the L & R Level (green) LED's will light.
If the test failed, the L & R Clip (red) LED's will light.
To run the test again, press the STORE button.
To run the test continuously, press the TAP button.
To stop the test from running continuously, press the STORE button.
MIDI Thru To MIDI In
The MIDI Thru circuitry is tested during the ATE testing, a MIDI command is sent to the MPX 110 which
sets the MIDI Out/MIDI Thru to MIDI Thru. The default setting for the MIDI Out/MIDI Thru is MIDI Out.
Using the APUTIL.EXE program utility with command arguments from DOS prompt you can test MIDI I/O.
APUTIL M allows you to transmit MIDI data from PC. The APUTIL M T command is a self contained test for
MIDI THRU and wrap around (for information on APUTIL, refer to document 010-09629). The MIDI OUT
cable from the Audio Precision's PC (MPU-401 Card) will be connected to the MIDI IN connector on the
MPX 110. The MIDI IN cable from the Audio Precision's PC will be connected to the MIDI OUT/MIDI THRU
connector on the MPX 110.
When the APUTIL M T command is executed, the MIDI Output from the PC will produce a message (F8 for
example) in which the message will get reproduced at the MPX 110's MIDI THRU jack. The PC will read
and verify the message was received from the MPX 110's MIDI THRU jack. The test can be easily be run
by entering the command APUTIL M T F8 (or any other byte except for FF) in the Audio Precision's DOS
Store Tap
l
O
LSB
Lexicon
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