Encoder Test; Switch/Led Test; Acd Pot Test; Midi Wraparound Test - Lexicon MPX 110 Service Manual

MPX 110 Service Manual
Edit Bypass
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7. Turn VARIATION to 6 and verify that the Bypass, and Store LEDs are lit.
Edit Bypass
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8. Press Store to initiate the Encoder Test.

ENCODER TEST

1. Verify that the green Level L LED is lit.
2. Turn the VARIATION encoder clockwise direction one position at a time, and verify that the green Level
L LED turns off after the encoder has been turned one complete revolution. This indicates successful
completion of the VARIATION encoder test. The Level R LED should now light.
3. Turn the PROGRAM encoder clockwise one position at a time, and verify that the Level R LED turns off
after the encoder has been turned one complete revolution. This indicates successful completion of the
PROGRAM encoder test.
4. Verify that all of the front panel LEDs are now off.

SWITCH/LED TEST

1. Press and hold down the Right button on the footswitch. Verify that the green Level R LED is on.
Release the footswitch and verify that the LED turns off.
2. Press and hold down the Left button on the footswitch. Verify that the green Level L LED is on.
Release the footswitch and verify that the LED turns off.
3. Press and hold the front panel Bypass button. Verify that its LED is on. Release Bypass and verify that
the LED turns off.
4. Press and hold the front panel Tap button. Verify that its LED is on. Release Tap and verify that the
LED turns off.
5. Press and hold the front panel Store button. Verify that its LED is on. Release Store and verify that the
LED turns off. Releasing Store also exits the test series and should cause both of the green Level
LEDs to turn on.

ACD POT TEST

Note: During the ADC Pot Test, each potentiometer must be varied over its entire range from fully counter-
clockwise to fully clockwise, and back to fully counter-clockwise within 5 seconds. Otherwise the test will fail
due to a time-out error. Be prepared, therefore, to move the Mix pot as soon as the test is initiated.
1. In preparation for the test, turn the Mix, Effects Lvl/Bal and Adjust pots fully counter-clockwise.
2. Turn VARIATION to 7 and verify that the Bypass, Store and Tap LEDs are on, as shown below.
Edit Bypass
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3. Press Store to initiate the ADC Pot Test. The Level L LED will light to indicate the test has begun and
the Mix pot is under test.
4. Move Mix from its fully counterclockwise position to fully clockwise, and back within 5 seconds. The
Level L LED will flash to indicate the Mix pot has passed and the Level R LED will light.
5. Move Effect Lvl/Bal from its fully counterclockwise position to fully clockwise, and back within 5
seconds. The Level R LED will flash to indicate the Effect Lvl/Bal pot has passed, then both Level
LEDs will light.
6. Move Adjust from its fully counterclockwise position to fully clockwise, and back within 5 seconds. Both
Level LEDs will flash to indicate the Adjust pot has passed, then the Level LEDs will light steadily to
indicate the ADC Pot Test is complete.

MIDI WRAPAROUND TEST

1. Turn VARIATION to the 9 and verify that the Edit and Tap LEDs are lit as shown below.
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Store Tap
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Store Tap
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Store Tap
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