Lexicon
5-5
Due to the nature of the Digipots and the way they are tested, the diagnostics are unable to detect which
Digipot is bad because they are tested serially. If the test fails, verify all 3 signals are present at the
Digipots. Trace the DP_DATA path signals. If there’s a bad, shorted or missing DP_DATA signal, the
DP_FBK signal won’t report the correct data to the ADSP2186.
Functional Tests / Extended Diagnostics
These diagnostics are provided to verify specific MPX G2 functions.
To enter the Functional Tests / Extended Diagnostics, power on the unit while pressing down and holding
down the Edit button. When the display reads Lexicon release the edit button. After 5 seconds the display
reads:
Diags: Tests
< Function Tests
At this point you are placed at the top of the Functional Tests Menu. Turning the Encoder CW will allow you
to access and select all the test available in this Menu. Below is a list of those tests:
Switch*
Pot
LED*
Display Char*
Display Block*
Auto Execution
Burn-in Loop
Footpedal
MIDI
DRAM
WCS
SRAM
ROM Checksum
2186 SRAM
2186-Lex
Sample Rate
Digipot
Once the test is displayed, the STORE LED will flash about once every second. The STORE button must
be pressed to execute the test. When a test is executed, the STORE LED will go off. When the test is
finished, the STORE LED will start flashing again.
* When running the Switch, LED, Display Char & Display Block Tests, the NO< button must be pressed and
held for about ½ second to exit the tests.
Pressing the NO< button in Function Tests mode displays a message that will then take you to the
Extended Diagnostics Menu. The display reads:
Diags: Top Level
Tests >
At this point you are placed at the top of the Top Level Menu which consists of 6 sub-menus. Turning the
Encoder CW will allow you to access these 6 sub-menus available in this menu. Below is a list of those
menus:
Exit Diags
Scope Diags
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