I purchased this unit 15 months ago. I noticed then that when I backed up a movie and tried to play it later, it may or may not play. error message was "invald disc".....this was done with movies that I have purchased at retail stores also, in other words, commercially made movies..the error seems random and without a pattern...I am a retired electronic tech and I think after the holidays, I will try to put in a new dvr optical drive..I have company coming and I don't want to have this messed up while they are here....any help would be appreciated. Is there a source of a schematic and parts layout available anywhere?
Thanks again
Pat Oden
wpoplo@cableone.net
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