Serial Port Service Check - Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual

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Serial Port Service Check

Run the .
"Serial Wrap Test" on page 3-13
Note: The Serial Wrap Test is designed to check the serial port
hardware by using a wrap plug (P/N 1329048) and invoking the
Serial Post Diagnostic Test. The test helps isolate the printer from
the serial cable and host. The test provides failure information on the
display for approximately three seconds. If the test indicates a
problem, replace the controller board.
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Diagnostic Information