Epson LT - 286e - Manual (Page 40)

Controller Test
This test checks the keyboard controller.
Scan/ASCII Code Test
This test checks the scan codes assigned to the keys on the
keyboard.
When you select this test, DIAG displays the layout of your
keyboard on the screen.
When you press a key, DIAG displays the scan code and the
ASCII code of the key. See the “Keyboard Scan/ASCII Codes”
section later in this booklet for a complete list of the scan codes
and ASCII codes for your keyboard.
Press Ctrl Break at any time to end this test.
Keyboard Clock Line Test
This test checks the keyboard clock line.
Keyboard Data Line Test
This test checks the keyboard data line.
System
Diagnostics 35