Front Panel Switches; Encoder Test - Lexicon MPX 500 Service Manual

MPX 500 Service Manual
"BYPASS". The remaining LEDs will be off. When the LEFT FOOTSWITCH is released, the BYPASS LED
will go off.
Press the RIGHT FOOTSWITCH (TIP). The TAP LED will light and the LCD Display will indicate "TAP". The
remaining LEDs will be off. When the RIGHT FOOTSWITCH is released, the TAP LED will go off.

Front Panel Switches:

Press and hold the EDIT button. The EDIT LED will light, and the LCD Display will indicate "EDIT". The
remaining LEDs will be off. When the EDIT button is released, the EDIT LED will be turned off.
Press and hold the SYSTEM button. The SYSTEM LED will light, and the LCD Display will indicate
"SYSTEM". The remaining LEDs will be off. When the SYSTEM button is released, the SYSTEM LED will
be turned off.
Press and hold the LOAD button. The LOAD LED will light, and the LCD Display will indicate "LOAD". The
remaining LEDs will be off. When the LOAD button is released, the LOAD LED will be turned off.
Press and hold the BYPASS button. The BYPASS LED will light, and the LCD Display will indicate
"BYPASS". The remaining LEDs will be off. When the BYPASS button is released, the BYPASS LED will
be turned off.
Press and hold the STORE button. The STORE LED will light, and the LCD Display will indicate "STORE".
The remaining LEDs will be off. When the STORE button is released, the STORE LED will be turned off.
Press and hold the TAP button. The TAP LED will light, and the LCD Display will indicate "TAP". The
remaining LEDs will be off. When the TAP button is released, the TAP LED will be turned off.
Press and hold the BANK button (PROGRAM knob). The LCD Display will indicate "BANK". The remaining
LEDs will be off. When the BANK button (PROGRAM knob) is released, the LCD Display will indicate
"Done".

#9 Encoder Test:

During this test, the Z80 microprocessor reads the value of the encoder being tested and then expects the
next value read from the encoder (when the encoder position is moved) will be at a predetermined
incremental value. Therefore, during the test each encoder must be rotated in a clockwise direction as it is
being tested, or the test will fail.
When the test is executed, all front panel LEDs will be turned off and the LCD Display will indicate the
encoder that is under test along with the hexadecimal value of the encoder's current position. The
hexadecimal values range from (0-F) for the EDIT (1-4) encoders and from (00-1F) for the PROGRAM
encoder. The encoders are tested in the following sequence: EDIT 1, EDIT 2, EDIT 3, EDIT 4 and
PROGRAM.
When the test is executed, the LCD Display will indicate in the lower left corner the encoder under test
(EDIT 1 -- XX) along with the hexadecimal value of the encoder's current position.
Turn the EDIT 1 encoder Clockwise (CW) one revolution (16 positions). The LCD Display will momentarily
indicate the Pass/Fail status (i.e. EDIT 1 – PASS). Confirm and proceed to test the next encoder.
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