Epson Apex 20020 - Manual (Page 177)

You can use this display to adjust the size of the display on the
screen. The vertical and horizontal adjustments are located on
your monitor.
Sync Check
This test is provided for service purposes only. If you
accidentally select this option, press any key to end the test.
Run All Above Checks
To run all the tests on the menu in sequence, press 6 and
Enter. When you choose this option, all checks for the
monochrome adapter and CRT are performed automatically in
sequential order. Although you do not start each test, you must
still supply the appropriate responses to progress from one test
to the next.
Color Graphics Adapter and CRT Check
Use this option to check the operation of a color graphics
display adapter and monitor. This test includes several checks
that allow you to identify particular problems related to the
color display. To run this check, the color/mono switches on
the front and back panels of the computer must be set correctly
for a color monitor.
You can select the individual checks from the following menu.
Performing System Diagnostics C-13