The dvr is in my motor home and I don't use it that much it is a old 510 , I put a new lnb on my dish that didn't help ,I went from my house to my dvr and that didn't work, I called dish and they said being its in a motor home my service policy wasn't any good ,although they take my money every month, they gave me a phone number of a private contractor who said he couldn't get there till wed., so how do you test a dvr to find out if it is any good. Ron