Epson LT-286 - Manual (Page 133)

If all the keys function but the characters displayed do not match
the keys, press Y and then
Enter. Then reselect the keyboard test
from the DEVICE LIST and check that you selected the correct
keyboard layout. You can find diagrams of all the international
keyboard layouts in the MS-DOS manual.
If any key is incorrect, press N and Enter. Make a copy of the error
code and message, or print them out, and contact your Epson
dealer.
Monochrome Display Adapter and CRT Check
Use this option to verify the operation of a monochrome adapter
and display. This test includes several checks that allow you to
identify particular problems related to the monochrome display. To
run this check, you must be using a monochrome monitor attached
to a monochrome display adapter in an expansion chassis. DIP
switches 5 and 6 on the rear panel must both be off.
You can select the individual checks from this menu:
MONOCHROME ADAPTER AND CRT CHECK MENU
1 - Monochrome adapter check
2
- Attribute check
3 - Character set check
4 - Video check
5
- Sync check
6 - Run all above checks
0 - Exit
Enter selection number:
If an error occurs during any of these tests, record the error code
and message, or print them out. Then contact your Epson dealer.
D-8 Performing System Diagnostics