Eeprom Checksum (8) - Lexicon MPX 110 Service Manual

MPX 110 Service Manual
If the MIX Pot exhibits a timeout failure, the Left Level & Clip (red) LED's will flash about 2 times per
second.
EFFECTS LVL/BAL Pot Pass/Fail Status:
The Right Level (green) LED will be lit to indicate when the EFFECTS LVL/BAL Pot is being tested. The
remaining LED's will be off.
If the EFFECTS LVL/BAL Pot passes the test, the Right Level (green) LED will flash about 2 times per
second.
If the EFFECTS LVL/BAL Pot fails the test, the Right Clip (red) LED will flash about 2 times per second.
If the EFFECTS LVL/BAL Pot exhibits a timeout failure, the Right Level & Clip (red) LED's will flash about 2
times per second.
ADJUST Pot Pass/Fail Status:
The L & R Level (green) LED's will be lit to indicate when the ADJUST Pot is being tested. The remaining
LED's will be off.
If the ADJUST Pot passes the test, the L & R Level (green) LED's will flash about 2 times per second.
If the ADJUST Pot fails the test, the L & R Clip (red) LED's will flash about 2 times per second.
If the ADJUST Pot exhibits a timeout failure, the L & R Level and L & R Clip (red) LED's will flash about 2
times per second.
After the MIX, EFFECTS LVL/BAL and ADJUST pots have all been tested, the headroom LED's will
display the pass/fail status of the test.
The L & R Level (green) LED's will be lit to indicate the test has passed, or the L & R Clip (red) LED's will
be lit to indicate the test has failed.

EEPROM CHECKSUM (8)

This is the same test that resides in the power on diagnostics. It was included in the Extended Diagnostics
for troubleshooting purposes.
This test will read each byte in the User Register portion of the EEPROM and add them together to
calculate a checksum. This value is compared with the checksum value stored in the EEPROM itself. This
checksum will be recalculated each time a register is stored.
The test will also verify that the EEPROM has been initialized properly. This is done by storing the software
version of the EPROM in the first five bytes of the EEPROM, and then verifying the stored value is correct
when the test is executed. If the stored value read from the first five bytes of the EEPROM is incorrect, the
EEPROM will be initialized.
When selected, the Binary LED's will read the following:
Edit Bypass
O O
MSB
Pressing the STORE button will execute the test.
When the test is executed the remaining buttons, encoders, ADC Pots and footswitches (2) are inactive,
and all Front Panel LED's will go off.
5-12
Store Tap
l
O
LSB