HP laser jet 6p

patrickv

Active Member
when i print pages from this printer it prints ok but when you turn over the paper it has weird designs underneath. take a look



what causes this ?

NOTE : this was a blank a4, with nothing on both sides
 
so i've open it up and cleaned inside and manage to remove dried out inks, but now when i highlight the printer it reads either "paperjam" or "out of memory"...
odd , any suggestions ?
 
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