Sony TRINITRON KV-VF21M40 Service Manual page 32

Troubleshooting (continued)
Symptom
Possible cause
Good picture/Abnormal
The TV system setting is
sound
inappropriate.
Snowy picture/Abnormal
The connection is loose or
sound
the cable is damaged.
The channel presetting is
inappropriate or
incomplete.
The antenna type is
inappropriate.
The antenna direction,
position and angle need
adjustment.
Dotted lines or stripes There is local interference
from cars, neon signs, hair
dryers, power generators,
etc.
Abnormal color patches
There is magnetic
disturbance from external
speakers or other
equipment.
Clock and timer section
The clock has The power has been
stopped and "--:--" is
interrupted or the AC
displayed.
power cord is disconnected.
52
Additional Information
Solutions
• If the sound of all the channels
is abnormal, display the TV SET
UP menu and select the
appropriate TV system (TV
SYS), then preset the channels
again. (pages 11 and 12)
• If the sound of some channels is
abnormal, display the MANUAL
PROGRAM menu in the TV SET
UP menu and select the
appropriate TV system (TV SYS)
(page 30).
Check the antenna cable and
connection on the video TV and at
the wall.
Display the TV SET UP menu and
select MANUAL PROGRAM to
manually preset the channel again.
Check the antenna type (VHF/
UHF). Contact a Sony dealer for
advice.
Adjust the antenna direction,
position and angle. Contact a Sony
dealer for advice.
• Do not use a hair dryer or other
equipment near the video TV.
• Adjust the antenna direction,
position and angle for minimum
interference. Contact a Sony
dealer for advice.
Locate external speakers or other
equipment away from the video
TV. Press ?/1 on the video TV to
turn off the video TV for about five
minutes, then turn on again.
Re-set the clock and timer settings.
(page 9)
Symptom Possible cause
Playback section
The safety device has been
Power is on, but the tape
does not run. activated.
Poor playback picture The color system setting is
inappropriate.
The tracking condition is
inappropriate.
The video heads are dirty.
The video heads may be
worn out.
The tape is worn out.
The sound drops out. The tape is defective.
Symptoms caused by contaminated video heads
• Normal picture • Rough picture •Unclear picture
initial
contamination
Solutions
Switch off, disconnect the AC
power cord, and leave the set for
about one minute.
Display VIDEO SET UP and set
the color system (COL SYS) to the
setting corresponding to the color
system that the tape is recorded in.
(page 42)
Adjust the tracking manually.
(page 37)
Clean the video heads using the
Sony T-25CLD, T-25CLDR, or T-
25CLW video head cleaning
cassette (not supplied). If these
cleaning cassettes are not available
in your area, have the heads
cleaned at your nearest Sony
service facility (a standard service
fee will be charged). Do not use
any commercially available liquid
type cleaning cassettes other than
Sony's, as it may damage the video
heads.
The video heads may have to be
replaced. Contact a Sony dealer for
advice.
Use a new tape.
Use a new tape.
• No picture (or
black & white
screen appears)
t
terminal
continued
Additional Information
53