Hi
This particular model has good compatability with all disk types. Therefore the problem is unlikely to be with the type of disk you are using.
If this is happening with all disks then there is a problem with the laser reading the disk and this is usually due to dirt or debris on the lens.
You can avoid disassembly of the unit by trying a DVD cleaning disk such as
this. The alternative is to clean the lens with a Q-Tip and some isopropyl alcohol.
If the problem is confined to one brand of disk then suspect the disk itself as some recorders are picky about which brand disks they can read.
Hope this helps. Thanks for using FixYa.