How can I fix my RCA dvd/vcr combo to work with the remote?

I have a RCA dvd/vcr combo (DRC6355N) that worked good until just recently. It won't work with the remote, I changed batteries in the remote and even bought a new universal remote, which doesn't work either..I can't even put in the code. It's like the sensor for the remote isn't working on the combo, it works manually (records) ..but it doesn't have a "setup" button on it which I use to set my timer recording. What can I do?