Lexicon MPX G2, Service Manual

Page: 69 / 165

Lexicon
5-21
* Note: X = The amount of times the test failed.
If a test failed, pressing the >YES button again will display detailed information on the test. The information
displayed will represent specific details depending upon which test was run. The following are examples
that explain how to interpret the information.
Footpedal Failure (9)
When the Footpedal Test fails, the Address field will contain information that will indicate the last DC
voltage the ADC, Analog to Digital Converter (U8 and associated circuitry) read. The value in the Address
Field is in hexadecimal and must be converted to decimal notation.
After the value is converted to decimal, it must be divided by 2500 to indicate the last DC voltage that the
ADC read.
When Test Result is selected, the display will read the following:
Last Test: Failed
<> *1 times
* This assumes that the test was run 1 time.
Pressing the >YES button again will display the following if the Footpedal Test failed.
Following is an example where the last DC voltage read by the ADC was 2.01VDC:
Test #7 A:13B7
──────
Address Field
<S:0132 R:0000
└──┴─┬──┴──┘
These fields contain
───┘
no useful information
13B7(hex) = 5047 (decimal)
5047/2500=2.0188VDC
To exit, press the OPTIONS button.
MIDI Wraparound Failure (10)
When the MIDI Wraparound Test fails, the Address, Data Sent and Data Received fields are used. The
Data Sent and Data Received fields only use 1 byte (2 characters).
The Address field contains an error code from the following list:
1 - Transmit Timeout (UART (FPGA remains busy, never actually transmits)
2 - Receive Timeout (UART (FPGA) never got any data)
3 - Frame Error (stop bit, etc)
4 - Bad Data (UART (FPGA) got the wrong data back)
When Test Result is selected, the display will read the following:
Last Test: Failed
<> *1 times
* This assumes that the test was run 1 time.
Pressing the
>YES button again will display the following if the MIDI Test failed: