Lexicon MPX 110 - ROM Checksum Test (1)

MPX 110 Service Manual
5-6
The following tests can be run continuously by pressing the TAP button instead of the STORE button.
Test
Number
Test Name Binary
LED’s
1 ROM Checksum 0 0 0 1
2 SRAM Test 0 0 1 0
3 Lexichip3 WCS 0 0 1 1
4 Lexichip3 Interrupt Timer 0 1 0 0
5 Lexichip3 Audio Data File 0 1 0 1
8 EEPROM 1 0 0 0
9 MIDI 1 0 0 1
11 Lexichip3 External DRAM 1 0 1 1
When a test is run continuously a pass/fail status will be displayed and updated on the headroom LED’s
each time the test is run. If the test passed, the L & R Level (green) LED’s will light. If the test failed, the L &
R Clip (red) LED’s will light.
To stop the test from running continuously, press the STORE button.
ROM CHECKSUM TEST (1)
This is the same test that resides in the power up diagnostics. It was included in the Extended Diagnostics
for troubleshooting purposes.
The ROM checksum, which is a byte size value, will be located as the last location of Bank 0. The test will
add the contents of the entire ROM including the Checksum byte. The result should equal zero (8 bit
value).
When selected, the Binary LED’s will read the following:
Edit Bypass Store Tap
O O O l
MSB LSB
Pressing the STORE button will execute the test.
Pressing the TAP button will run the test continuously
The remaining buttons, encoders, ADC Pots and footswitches (2) are inactive. When the test is executed,
all Front Panel LED’s will go off.
If the test passed, the L & R Level (green) LED’s will light.
If the test failed, the Left Clip (red) LED will light.
To run the test again, press the STORE button.
To run the test continuously, press the TAP button.
To stop the test from running continuously, press the STORE button.