I have a Sony DVD Recorder HXD890 which has always given good service, but recently, trying to record on a manual setting - which has worked in the past - although it appears to be recording, all I get is a blank black screen.   Many of the digital channels do not display any programs on the guide and it is these I am trying to record on manual settings.   Recording on Guide setting is fine.   I have followed the manual for the manual setting, so know this is not the problem.   Any help or suggestions would be welcome.