Epson Progression U12 - Manual (Page 132)

Chapter 5
Running System Diagnostics
You can test the following devices using System diagnostics:
Systemboard
Numeric coprocessor
System memory
Diskette drive(s)
Hard disk drive(s)
serial port(s)
Parallel port(s)
Video adapter
Dot matrix printer(s).
See the table on page 5-7 for a list of the tests available for each
device.
Note
The Write, read checks for the hard disk drive(s) and
diskette drive(s) destroy data on the disk. Be sure to back up
any data on your hard disk or insert a blank, formatted
diskette before you run this test. Also be sure to do this if
you select Run all above checks.
Running System Diagnostics 5-1