Troubleshooting - Hitachi 31DX11B Operating Manual

Solid state color tv
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TROURLI_SH(_OTING
III
i. .o
p
....
• 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 reflectedfrom tall buildings,hills or some other objects.Chang-
ing 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 con-
necting several sets to the same antenna without using multiple antenna couplers.
• SNOW:
If your receiver is located in the fringe area of a television stationwhere 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.
SYMPTOMS
No picture,
no sound
Sound
OK,
picture
poor
Picture
OK, sound
poor
Picture
blurred
Lines or streaks
in picture
Poor
reception
on some
channels
Picture
rolls
vertically
No color
Poor
color
45

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