Yamaha RX-V640RDS owner manual Refer to

TROUBLESHOOTING

Problem	Cause	Remedy	Refer to
			page
Only the speaker on	Incorrect cable connections.	Connect the cables properly. If the problem persists,	16
one side can be		the cables may be defective.
heard.
No sound from the	The sound effect is switched off.	Press STEREO/EFFECT to turn it on.	–
effect speakers.
	A Dolby Surround, Dolby Digital or DTS	Select another DSP program.	25 – 30
	decoding DSP program is being used with
	material not encoded with Dolby
	Surround, Dolby Digital or DTS.
	A digital signal with a sampling		–
	frequency greater than 48 kHz is input to
	this unit.

No sound from the	The output level of the center speaker is
center speaker.	set to minimum.

Raise the level of the center speaker. 50

	“SOUND 1A CENTER” on the set menu	Select the appropriate mode for your center speaker.	41
	is set to NON.
	One of the Hi-Fi DSP programs (1 to 4)	Select another DSP program.	25 – 30
	has been selected (except for 6ch Stereo).
	The source encoded with a Dolby Digital		–
	or DTS signal does not have a center
	channel signal.
No sound from the	The output level of the rear speakers is set	Raise the output level of the rear speakers.	50
rear speakers.	to minimum.
	A monaural source is being played with	Select another DSP program.	25 – 30
	program 9.
No sound from the	“SOUND 1E BASS” on the set menu is	Select SWFR or BOTH.	42
subwoofer.	set to MAIN when a Dolby Digital or
	DTS signal is being played.
	“SOUND 1E BASS” on the set menu is	Select BOTH.	42
	set to SWFR or MAIN when a 2-channel
	source is being played.
	The source does not contain low bass		–
	signals (90 Hz and below).
Poor bass	“SOUND 1E BASS” on the set menu is	Select MAIN.	42
reproduction.	set to SWFR or BOTH and your system
	does not include a subwoofer.

The speaker mode settings (main, center, rear, or rear center) on the set menu does not match your speaker configuration.

Select the appropriate position for each speaker based	41 – 42
on the size of the speakers in your configuration.

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