How can I clean up the internal parts of my Samsung laser printer ML-1665? The printer was ok, but after stopping to use it for quite too long, it started smudging paper. I thought it was the toner, so I replaced it with another brand new, original unit. Since then printing is way better, but some spots still remain, see pictures below. I think the damaged toner just leaked to the printer and now I need to find the right pieces that need a cleanup.
Replacing the drum seems an alternative, but what is the drum exactly? Is it available from Samsung for this old model? How can I replace it myself, in case I go for this option?
Spotted document sample
What should I clean up here?
Detail of spotted piece