Hitachi 50VF820 - Manual (Page 60)

60
Useful Information
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 television 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.
BLOCK NOISE (DIGITAL INPUT):
Fuzzy blocks may appear in some area or the whole area of the screen. This is
usually caused by interference from automobile ignition systems, neon lamps,
electrical drills, ghosting of the image and weak signals.
BLACK SCREEN:
When using an antenna, weak signals will display a black screen. It may be
necessary to upgrade your antenna.
NOTE: The TV set can generate sound distortion in external devices such as a radio. Please separate radio
equipment from the TV set to a considerable distance.