Yamaha RX-V640RDS owner manual Tuner, Remote control, Problem, Cause, Remedy, Refer to page

TROUBLESHOOTING

■Tuner

RX-V640RDS

	Problem	Cause	Remedy	Refer to
				page
	FM stereo reception is	The characteristics of FM stereo	Check the antenna connections.	13
	noisy.	broadcasts may cause this problem	Try using a high-quality directional FM
		when the transmitter is too far away or	antenna.
		the antenna input is poor.
			Use the manual tuning method.	32
	There is distortion, and	There is multipath interference.	Adjust the antenna position to eliminate	–
	clear reception cannot		multipath interference.
FM	be obtained even with a
	good FM antenna.
	The desired station	The station is too weak.	Use a high-quality directional FM antenna.	–
	cannot be tuned in with
	the automatic tuning		Use the manual tuning method.	32
	method.
	Previously preset	The unit has been disconnected for a	Re-store the stations.	33
	stations can no longer
		long period.
	be tuned in.
	The desired station	The signal is weak or the antenna	Tighten the AM loop antenna connections and	–
	cannot be tuned in with	connections are loose.	orient it for best reception.
	the automatic tuning
	method.		Use the manual tuning method.	32
AM	There are continuous	Noises result from lightning,	Use an outdoor antenna and a ground wire.	13
	crackling and hissing	fluorescent lamps, motors, thermostats	This will help somewhat, but it is difficult to
	noises.	and other electrical equipment.	eliminate all noise.
	There are buzzing and	A TV set is being used nearby.	Move this unit away from the TV.	–
	whining noises
	(especially in the
	evening).

■Remote control

Problem	Cause	Remedy
The remote control does	Wrong distance or angle.	The remote control will function within a
not work nor function		maximum range of 6 m (20 feet) and no more
properly.		than 30 degrees off-axis from the front panel.
	Direct sunlight or lighting (from an	Reposition this unit.
	inverter type of fluorescent lamp, etc.) is
	striking the remote control sensor of this
	unit.
	The batteries are weak.	Replace all batteries with new ones.
	The manufacture code has not correctly	Set the code correctly.
	set.
		Try setting another code of the same manufac-
		turer.
	Even if the manufacturer code is correctly
	set, there are some models that do not
	respond to the remote control.

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