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-   -   Yamaha RX-V490.. Tuner problem (http://www.diyaudio.com/forums/solid-state/67829-yamaha-rx-v490-tuner-problem.html)

tharakag 14th November 2005 09:05 AM

Yamaha RX-V490.. Tuner problem
 
Hi,
I have a Yamaha RX-V490 Reveiver and about two weeks ago, the FM tuner went bad. Now it goes from 76MHz to 90 MHz (I believe Japanese range) instead of 87.5 to 107.9 MHz (US range).

Does anybody have an idea what could be wrong? Also, is there any possibility to find a service manual for this model?

Any advice will be most welcome!

Thanks in advance.

dudu 14th November 2005 11:31 AM

Yamaha RX-V490
 
Adress........?:smash:
Dudu

tharakag 14th November 2005 03:53 PM

Thanks.. I don't know if you refer to e-mail address or physical address.. Following are both..

e-mail : tharaka@bellsouth.net

Home:
Tharaka Goonetilleke
2990, White Cedar Circle,
Kissimee FL 34741
USA

q2audio 3rd September 2007 04:43 PM

RX-V490 Tuner Problem
 
I have the same tuner problem with my RX-V490. It will only tune the Japanese band. Please let me know how I can fix this.

Thanks!

Tim

aman 5th September 2007 12:41 PM

hi all
i have got a technics tuner and its frequency band is only 76-90 mhz. could i make some changes to increase the range to get indian stations(87-108mhz)?????. I have another tuner of Yamaha (dont remember the model) its range is 87-108mhz but it doesnt play any station, may be theres some problem in the front end or anywhere else,the output is only a hissing sound.
I think the microprocessor unit in 76-90mhz band is programmed for a selected band only and little can be done to increase the range and it would need a drastic re-engineering to get the universal range.
any sort of help is appreciated.
aman

derguteton 5th September 2007 01:24 PM

RX-V490 SM
 
Hi,


I tried to send You the SM, but your email-adress doesn't respond.

So I uploaded it at http://fileshare.eshop.bg

I hope this will help You

Michael ;)

Westley 5th September 2007 01:57 PM

The tuning problem may be caused by a component failure or corrupted data. Most likely, this can be corrected by performing the factory initialization. Press the PHONO and CD buttons simultaneously, then press the POWER switch. This begins the test mode. Press EFFECT button to exit to go back to the factory set specifications.

If that does not restore the tunig to the US band, the microprocessor IC301 may need replacing. Good luck.

q2audio 5th September 2007 09:47 PM

Thanks guys! I'll give it a shot asap.

Tim


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