Color Bar Test; Fill Screen Test; Disk-Based Diagnostics; Cleaning Procedure - Zenith Z-100 PC series Service Manual

Color Bar Test
The ROM-based color bar test can be used to set the
display brightness and contrast to comfortable levels.
To display the color bars using a Zenith Data Sys ­
tems PC-compatible computer:
1. Press the
CTRL, ALT,
and
INS
keys in sequence,
hold them, and then release them.
2. After the Monitor prompt appears, press C and
then press
RETURN.
3. Color bars, in the form of a gray scale, should
now be displayed.
Use this test in conjunction with the troubleshooting
charts at the end of this chapter.
Fill Screen Test
The ROM-based keyboard test can be used to set
the brightness, contrast, focus, and dimensions of
the display to comfortable levels. This test fills the
screen with any character entered from the
keyboard. To perform the fill screen test:
1. Press the
CTRL, AL T,
and
INS
keys in sequence,
hold them, and then release them.
2. After the Monitor prompt appears, type TEST
and then press
RETURN.
3. Select the keyboard test.
4. Press any displayable key to fill the screen with
that character. (The capital Z is a good charac­
ter to display for assessing display characteris ­
tics.)
Disk-Based Diagnostics
The disk-based diagnostics can be used to generate
test patterns that may be helpful when performing
display adjustments. The diagnostics are menu ­
driven. A general procedure for using the diagnostics
follows. For further information about the disk-based
diagnostics, refer to the documentation supplied with
the disk.
1. Boot the disk-based diagnostics.
2. Use the arrow keys to select the computer con ­
figuration you are using.
3. Select NO when prompted for the fast test.
4. The diagnostic menu will now be displayed. Use
the arrow keys to choose the single test, and
then use the arrow keys to choose the video
diagnostic menu.
5. The video diagnostic menu will now be dis ­
played. Use the arrow keys to choose the single
test, and then use the arrow keys to choose the
video patterns. FinallY,use the arrow keys to se ­
lect the coarse grid or the focus pattern as
needed.
Cleaning Procedure . "\
CAUTION
Unplug the monitor before cleaning. Be
sure that the monitor is completely dry be­
fore plugging in the unit.
Clean the cabinet with a lint-free cloth, lightly dam ­
pened with a mild cleaning solution. Do not spray liq­
uids directly on the monitor or use a wet, saturated
cloth.
Clean the screen with a good quality, non-abrasive
glass cleaner. The display glass of the ZCM-1490 is
treated with an OCLI HEA coating to reduce glare.
Fingerprints and smudges are more noticeable with
this coating. Glass cleaners containing isopropyl al­
cohol are effective in removing these marks.
Page 6-4
Troubleshooting