Dvd Recorder & Vcr Combination Suberb! Problem With Panasonic DMR-EX95 DVD Recorder, TV Screen Goes Blank Now And Again And U80 Comes On The Display?

Problem with Panasonic DMR-EX95 DVD Recorder, TV screen goes blank now and again and U80 comes on the display? - dvd recorder & vcr combination suberb!

Panasonic DMR-EX95 - 250GB HDD & DVD Recorder
VCR - With the conversion to 1080p and Freeview - Silver
Again and again, a black screen appears when you will use this combination, DVD player and U80-code on the screen. I looked at the code in the instruction book, but this code does not there.Could
someone please tell me what this code U80. It was that this Panasonic recorder / combination of one year.