Epson LT-286 - Manual (Page 136)

Color Graphics Adapter and CRT
Use this option to check the operation of your video controller and
screen. The test includes several checks that allow you to identify
specific video problems.
You select the individual checks from the following menu:
COLOR GRAPHICS ADAPTER AND CRT CHECK
MENU
1 - Color graphics adapter check
2 - Attribute check
3 - Character set check
4 - 40-column character set check
5 - 320X200 graphics mode check
6 - 640X200 graphics mode check
7
- Screen paging check
8
- Color video check
9 - Sync check
10 - Run all above checks
0 - Exit
Enter selection number:
If an error occurs during any of these tests, write down the error
message, or print it out, and then contact your Epson dealer. When
you are finished with the test, press 0 and
Enter to return to the
DEVICE LIST.
Color Graphics Adapter Check
To check the color graphics adapter, press 1 and then Enter.
The computer checks the video RAM (display memory) on the
display adapter by writing test data to memory, then reading it back
and comparing it to the written data. The computer also tests the
video enable signal of the display controller chip.
Performing System Diagnostics D-11