I have a rc-103 remote and need the code for my onkyo tx sr800 thx home theater.I also need to know how to program it in remote

Unfortunately, the RC-771M remote doesn't control the TX-SR502. It will only work with these Onkyo models: TX-NR1008 and TX-NR808. The RC-567M is the one for the TX-SR502; replacement remotes that are exact replacements are still available from various places including Amazon.com .

Since the TX-SR502 was released in ~2004, that replacement remote probably won't control other devices that were released in 2004 or later. Onkyo changed its IR code programming before the TX-NR1008 was released in ~2010 and the RC-771M can't communicate with the older receiver. The manuals for the receivers listed above are still available from Onkyo on the product page under the Downloads tab.

I wish that I had better news for you.

Cindy Wells

Register and download the manual for free at retrevo.com

http://www.retrevo.com/s/Onkyo-TX-DS575x-Receivers-review-manual/id/365dj179/t/1-2/

The remote is RC-391M
Original $80

http://cgi.ebay.com/RC-391M-ONKYO-HOME-THEATER-CONTROLLER-/120686595599?pt=LH_DefaultDomain_0&hash=item1c197b4e0f

substitute remote $58

http://remotes.com/remotes/servlet/rs?a=gmi&uuid=A12986292726381&smodel=TXDS575&brand_pn=ONKYO_TXDS575

Your Onkyo TX-SR304 receivers remote (RC-645S) is not capable of controlling devices by other manufacturers. It controls only Onkyo devices.
Other Onkyo remotes do have universal remote functionality and you can download Onkyo remote codes here.

I hope that helps.
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Download Onkyo TX-SR304 users manual here.

http://www.remotecodelist.com/remotes/

Hope that helps

Have you tried the Onkyo website yet?