Epson 10020 - Manual (Page 172)

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, and then
reading it back and comparing it to the written data. It also
tests the video enable signal of the display controller chip.
Attribute Check
To check the display attributes of the color graphics adapter
card, press 2 and Enter. Several messages are displayed
showing examples of all the possible display attributes and
colors. Check the information displayed on your screen, and
respond to the prompt:
Is the display correct (Y/N)?
Press Y and then Enter if the display is correct. If the colors
are not correct, adjust the controls on your display monitor. If
they are still incorrect, press N and Enter.
Contact your Customer Care Center if you have any monitor
problems.
Performing System Diagnostics
D-15