Sony CPD-120AS Operating Instructions Manual page 31

Howling (feed-back) is heard
m Decrease the volume with . +/– buttons, or turn down the
microphone input volume of the sound board.
Picture is scrambled
m Check your graphics board manual for the proper display setting on
the display.
m Check this manual and confirm that the graphic mode and the
frequency at which you are trying to operate is supported. Even
within the proper range, some video boards may have a sync pulse
that is too narrow for the display to sync correctly.
Color is not uniform
m Trip the u switch once to activate the Auto-degauss cycle*.
Picture is flickering
m If the refresh rate is not appropriate, the picture may flicker. Set the
refresh rate of the non-interlace mode as high as possible on the
computer. For details on how to set the refresh rate, consult the dealer
of your computer or video board.
Screen image is not centered or sized properly
m Adjust picture centering, size, or geometry (rotation/ pincushion) on
the OSD (pages 19–22).
m Some video modes do not fill the screen to the edge of the display.
There is no single answer to solve the problem. There is a tendency for
this problem to occur on higher refresh timings.
Picture is fuzzy
m Adjust the contrast and brightness on the OSD (pages 17, 18). Some
brands of SVGA boards have an excessive video output level which
creates a fuzzy picture at maximum contrast.
m The GPE setting may not be proper for the picture. Selecting a lower
GPE number may improve the picture (page 25).
m Trip the u switch once to activate the Auto-degauss cycle*.
Picture bounces or has wavy oscillations
m Isolate and eliminate any potential sources of electric or magnetic
fields. Common causes for this symptom are electric fans, fluorescent
lighting, laser printers, etc.
m If you have another display close to this display, increase the distance
between them to reduce interference.
m Try plugging the display into a different AC outlet, preferably on a
different circuit.
Picture appears to be ghosting
m Eliminate the use of video extension cables and/or video switch boxes
if this symptom occurs. Excessive cable length or weak connections
can produce this symptom.
Continued to the next page
Troubleshooting
31 GB