On Sun, 2007-04-29 at 21:08 -0700, Chuck Guzis wrote:
  How old is the drum?  A rule of thumb is that many OPC
drums have a
 shelf life of 3-4 years.  They're also wrecked by strong ambient
 light. 
I found while I was debugging a paper pick problem with my Tektronix
Phaser 560 that I was getting streaky blurry prints.  I had one of the
cover interlocks spragged and the cover open.  Stray light was affecting
the operation of the drum.
Check the case is light-tight.
Gordon