Dolby Laboratories DV2418 - Manual (Page 59)

57
Reception Disturbances
CARE AND MAINTENANCE
IGNITION:
GHOSTS:
SNOW:
RADIO FREQUENCY INTERFERENCE:
PICTURE SIZE VARIATION:
Black spots or horizontal streaks may appear, picture may flutter or drift.
Usually caused by interference from automobile ignition systems, neon
lamps, electric drills and other electric appliances.
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 other
objects. Changing the direction or position of the antenna may improve the
reception.
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 maybe necessary to install an
external antenna to improve the picture.
This interference produces moving ripples or diagonal streaks, and in some
cases, causes loss of contrast in the picture.
A slight picture size variation is quite normal when you adjust the
CONTRAST or BRIGHTNESS setting.
To prevent fire or shock hazard, disconnect your unit from the AC power source when cleaning. The finish on the
receiver may be cleaned with a dust cloth and cared for as other furniture. Use caution when cleaning and wiping
the plastic parts. Mild soap and a soft, damp cloth may be used.
Most types of television interference can be remedied by adjusting the height and position of the VHF/UHF antenna.
Outdoor antennas are recommended for best results if not using cable or a satellite. The most common types of
television interference are shown below. If one of these symptoms appear when the TV is connected to a Cable TV
system, the disturbance may be caused by the local cable company broadcast.