Have you've tried cleaning the laser with a cleaning disc?
Failing this it may be worth removing the cover and cleaning the lens directly with a
QTip and some lens cleaning fluid. Only use a drop and then wipe off with a clean dry
QTip.
The other option is that you are using an incompatible format of blank DVDs. I've heard of people having problems using DVD-R & DVD-RW and although it is lised as being suitable for all types of recordable DVDs I belive you're best using DVD+R & DVD+RW.
The Manual states
Recordable disc
• We strongly recommend for good recording quality:
SONY DVD+RW 4x, MAXELL DVD+R 4x/8x/16x, SONY DVD+R 4x/8x/16x, TDK DVD+R 4x/8x/16x,
MAXELL DVD-RW 4x, MAXELL DVD-R 8x/16x
• Discs that have been tested and are proven to be compatible with this recorder:
VERBATIM DVD+RW 4x VERBATIM DVD+R 8x
VERBATIM DVD-RW x VERBATIM DVD-R 8x JVC DVD-RW 4x MAXELL DVD-R 16x
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