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TROUBLESHOOTING
■ Tuner
Problem Cause Remedy
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page
This unit does not
operate properly.
The internal microcomputer has been
frozen by an external electric shock (such
as lightning or excessive static electricity)
or by a power supply with low voltage.
Disconnect the power cable from the AC wall outlet
and then plug it in again after about 30 seconds.
—
“CHECK SP WIRES”
appears in the front
panel display.
Speaker cables are short-circuited. Make sure all speaker cables are connected correctly.
16
There is noise
interference from
digital or radio
frequency equipment.
This unit is too close to the digital or high-
frequency equipment.
Move this unit further away from such equipment.
—
The picture is
disturbed.
The video source uses scrambled or
encoded signals to prevent dubbing.
This unit suddenly
enters the standby
mode.
The internal temperature becomes too
high and the overheat protection circuitry
has been activated.
Wait about 1 hour for this unit to cool down and then
turn it back on.
—
Problem Cause Remedy
See
page
FM
FM stereo reception is
noisy.
The characteristics of FM stereo
broadcasts may cause this problem
when the transmitter is too far away or
the antenna input is poor.
Check the antenna connections.
31
Try using a high-quality directional FM
antenna.
—
Use the manual tuning method.
58
There is distortion, and
clear reception cannot
be obtained even with a
good FM antenna.
There is multi-path interference. Adjust the antenna position to eliminate
multi-path interference.
—
The desired station
cannot be tuned into
with the automatic
tuning method.
The signal is too weak. Use a high-quality directional FM antenna.
—
Use the manual tuning method.
58
Previously preset
stations can no longer
be tuned into.
This unit has been disconnected for a
long period.
Preset the stations again.
59, 60
AM
The desired station
cannot be tuned into
with the automatic
tuning method.
The signal is weak or the antenna
connections are loose.
Tighten the AM loop antenna connections
and orient it for the best reception.
—
Use the manual tuning method.
58
There are continuous
crackling and hissing
noises.
Noises can result from lightning,
fluorescent lamps, motors, thermostats
and other electrical equipment.
Use an outdoor antenna and a ground wire.
This will help somewhat, but it is difficult to
eliminate all noise.
—
There are buzzing and
whining noises.
A TV set is being used nearby. Move this unit away from the TV set.
—