Hitachi 42HDM12A - Manual (Page 32)

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RECEPTION PROBLEMS
• IGNITION NOISE:
Black spots or horizontal streaks may appear, picture may flutter or drift. Usually
caused by interference from automobile ignition systems, neon lamps, electrical
drills, and other electrical appliances.
• GHOSTS:
Ghosts are caused by the monitor signal following two paths. One is the direct path
and the other is reflected from tall buildings, hills or some other objects. Changing
the direction or position of the antenna may improve reception. Ghosting may also
be caused by defects in the antenna system such as unshielded leads or connecting
several sets to the same antenna without using multiple antenna couplers.
• SNOW:
If your receiver is located in the fringe area of a television station where the signal is
weak, your picture may be marred by the appearance of small dots. When the signal
is extremely weak, it may be necessary to install a special antenna to improve the
picture.
• RADIO FREQUENCY INTERFERENCE:
The interference produces moving ripples or diagonal streaks, and in some cases,
causes loss of contrast in the picture.
• PREVENTION OF AN OBSTACLE TO RADIO RECEIVERS
This monitor has been designed pursuant to the FCC class B Rules. This is to
prevent a problem to Radio receivers. If this monitor causes a problem to Radio
receivers, then take the following steps:
- Keep the monitor away from Radio.
- Adjust Radio antennas in order for the monitor not to receive interference.
- The antenna cable of Radio should be kept away from the monitor.
- Use a coaxial cable for antenna.
You can check if this monitor influences Radio receivers by turning off all other
equipment other than the monitor.
If you find a problem receiving Radio when using the monitor, check the instructions
mentioned above.
• The display image appears
scrolling diagonal.
• Text displayed across the
screen
appears vertically streaked, with
the characters in vertical columns
blurred.
• Adjust the horizontal clock and clock phase.
(Adjust the horizontal clock first, the clock phase next.)
(RGB input)
• Text displayed across the
screen appears blurred.
• A fine pattern flickers when
displayed on the screen.
• Adjust the clock phase for the clearest viewing.
(RGB input)
• Vertical stripes appear, depending on the
screen contents. • The plasma display panel is lighting the phosphors by the discharge of internal
radiation. Depending on the screen contents, in rare cases this may cause vertical
stripes to appear because of failure to light. Please note that this is not a
malfunction.
• Coarse horizontal stripes appear in FULL
display.
• Adjusting the clock phase will reduce the horizontal stripes.
(RGB input)
• The display dims to make the picture invisible
during special playback of a VCR (FF, REW).
• This condition may occur when the unit is connected to a VCR with component
output, such as 480i, but it is not a failure. But when it occurs, switch to composite
output.