IBM 6648 User Guide - Page 99

Monitor problems, Action, Attention, shielding might be available for your monitor. See your

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Monitor problems Wavy, unreadable, rolling, distorted, or jittery screen images. Screen flickers. Action If the monitor self-tests show that the monitor is working properly, verify that: 1. The location of the monitor is appropriate. Magnetic fields around other devices, such as transformers, appliances, fluorescent lights, and other monitors might be causing the problem. To determine if the location is causing the problem: a. Turn off the monitor. (Moving a color monitor while it is turned on might cause screen discoloration.) b. Adjust the placement of the monitor and other devices so that they are at least 305 mm (12 in.) apart. Also, when relocating the monitor, be sure it is at least 75 mm (3 in.) from the diskette drives to prevent diskette drive read/write errors. c. Turn on the monitor. 2. An IBM monitor signal cable is properly connected to the monitor and computer, and that the cable is installed securely. Non-IBM monitor signal cables might cause unpredictable problems. 3. You are not trying to run your monitor at a higher refresh rate than the monitor supports. See the documentation supplied with your monitor for supported refresh rates. Note: An enhanced monitor signal cable with additional shielding might be available for your monitor. See your IBM reseller or marketing representative for information. If you cannot correct the problem, have the computer serviced. Set the monitor for the highest, noninterlaced refresh rate supported by your monitor and the video controller in your computer. Attention: Using a resolution or refresh rate that is not supported by your monitor might damage it. You can reset the refresh rate through your operating system, using the instructions provided in the README files. See your operating system documentation for further information on monitor settings. If this does not correct the problem, have the monitor and computer serviced. Chapter 6. Troubleshooting 85

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Monitor problems
Action
Wavy, unreadable, rolling,
distorted, or jittery screen
images.
If the monitor self-tests show that the monitor is working
properly, verify that:
1.
The location of the monitor is appropriate. Magnetic
fields around other devices, such as transformers,
appliances, fluorescent lights, and other monitors
might be causing the problem. To determine if the
location is causing the problem:
a.
Turn off the monitor. (Moving a color monitor
while it is turned on might cause screen
discoloration.)
b.
Adjust the placement of the monitor and other
devices so that they are at least 305 mm (12 in.)
apart. Also, when relocating the monitor, be sure it
is at least 75 mm (3 in.) from the diskette drives to
prevent diskette drive read/write errors.
c.
Turn on the monitor.
2.
An IBM monitor signal cable is properly connected to
the monitor and computer, and that the cable is
installed securely. Non-IBM monitor signal cables
might cause unpredictable problems.
3.
You are not trying to run your monitor at a higher
refresh rate than the monitor supports. See the
documentation supplied with your monitor for
supported refresh rates.
Note:
An enhanced monitor signal cable with additional
shielding might be available for your monitor. See your
IBM reseller or marketing representative for information.
If you cannot correct the problem, have the computer
serviced.
Screen flickers.
Set the monitor for the highest, noninterlaced refresh rate
supported by your monitor and the video controller in
your computer.
Attention:
Using a resolution or refresh rate that is not
supported by your monitor might damage it.
You can reset the refresh rate through your operating
system, using the instructions provided in the README
files. See your operating system documentation for
further information on monitor settings.
If this does not correct the problem, have the monitor
and computer serviced.
Chapter 6. Troubleshooting
85