Lexicon MPX 500, Service Manual, Page: 25 / 68

Lexicon
5-7
Turn the EDIT 2 encoder Clockwise (CW) one revolution (16 positions). The LCD Display will momentarily
indicate the Pass/Fail status (i.e. EDIT 2 – PASS). Confirm and proceed to test the next encoder.
Turn the EDIT 3 encoder Clockwise (CW) one revolution (16 positions). The LCD Display will momentarily
indicate the Pass/Fail status (i.e. EDIT 3 – PASS). Confirm and proceed to test the next encoder.
Turn the EDIT 4 encoder Clockwise (CW) one revolution (16 positions). The LCD Display will momentarily
indicate the Pass/Fail status (i.e. EDIT 4 – PASS). Confirm and proceed to test the next encoder.
Turn the PROGRAM encoder Clockwise (CW) one and one half revolutions (32 positions). The LCD
Display will indicate the Pass/Fail status (i.e. PROGRAM – PASS).
Pressing the BANK button (PROGRAM knob) will exit the test. The LCD Display will momentarily indicate
“Done”, then return to the Extended Diagnostics.
#10 MIDI Test:
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.
When the test is executed, the LCD Display will indicate the test is “Running…” followed by the Pass/Fail
status of the test.
#11 LCD Test:
This test will verify all the elements of the display are working properly.
When the test is executed, the LCD Display will indicate the test is “Running…” and the LCD Display is
filled with 3 random patterns until all of the pixels have turned black on the LCD Display.
Press and hold the BANK button (PROGRAM knob). This will clear all of the pixels on the LCD Display.
Releasing the BANK button will exit the test.
The LCD Display will indicate “Done”.
#12 Exit Test:
This selection will allow the user to exit the Extended Diagnostic Mode and enter normal operating mode.
Pressing the
BANK button (PROGRAM knob) will execute the test.
#13 Initialize Test:
This test will initialize all of the MPX 500 system parameters to their factory default settings.
Pressing the
BANK button (PROGRAM knob) will execute the test.
WARNING: This procedure will destroy any user settings or registers.
#14 Unused:
#15 Unused:
#16 Burn In Test:
The Burn In test is structured to help in two ways.