Yamaha RX-V661 Owner's Manual page 103

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