MPX G2 Service Manual
5-12
During the execution of the DRAM Test, a chase pattern is first displayed on the leftmost 7 segment display
followed by moving to the middle and then to the rightmost 7 segment display. This feature was added to let
the operator know that the test is running and didn’t crash on burn in. This test will take about 2 ½ minutes.
If a test failed during burn in, the unit will jump out of the diagnostic loop and display what test failed. The
top half of the display will indicate the test and the bottom half will indicate Failed. For example, if the
DRAM Test failed, the display would read:
DRAM Test
Failed
To exit the loop, press and hold the NO< button until the display reads:
Diags: Tests
< Burn-in Loop
Footpedal Test
This test can be performed with the customer built Lexicon Foot Controller Test Fixture (Lexicon part
#770-08508 - not available for sale) or generic foot controller with a potentiometer value from 10K-500K
The test checks out part of LM393 (U8) and its associated circuit as well as the FPGA (U84).
The test will check the Foot Pedal Controller Input by using the Foot Controller Test Fixture which contains
an LFO to sweep the Controller input from it's minimum value (0VDC) to it's maximum voltage (+5VDC).
The test will analyze the data generated by U8 during the sweep and confirms that the circuit is accurately
reporting the voltage to the FPGA (U84). When the sweep from min to max to has been completed
successfully, the test will display "PASS".
When using a generic foot controller, the operator must vary the pedal over its entire range from min (pedal
fully up) to max (pedal fully down) within 5 seconds after the test is executed. Otherwise, the test will fail.
When selected, the display will read the following:
At the Functions Tests menu turn the Encoder until the display reads the following:
Diags: Tests
< Footpedal
Next press the STORE button and release. The display will read the following:
Footpedal Test:
Testing...
After the STORE button is pressed, the test is executed and the display will read the following within 5
seconds if the test passed:
Footpedal Test:
Passed (done)
If the test failed the display reads:
Footpedal Test:
Failed (done)
To exit the test, press and hold down the NO< button until the display reads:
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