[Misc] Black Spots

[andalasgt]

Hi,
what is caused the dirty drum (there are black spots on the surface of drum), as result there are black spots on the paper of copied.
Thank's

[ExXeroid]

Foreign matter on drum surface. Bad cleaning blade. Maybe if you give us a Model # we can help more.

[andalasgt]

yes, there is toner dots on drum surface. How/why toner dots located on drum surface?

[ExXeroid]

Does the machine use developer? Maybe developer and toner are clumping and sticking to the drum. What is the condition of the cleaning blade? Maybe you should change the drum and developer at the same time.

[andalasgt]

the machine is canon ir5000.
thank's. I would give you a model tomorrow.

[badboys]

..seems like the tungsten/corona wire (primary unit) is arching. Replace the wire frequently if you want the drum to last longer.I use Autosol paste to polish drum surface instead of rock stone brownish powder.(IR5000 drum lifespan = 5millions copies)

[mrfixit51]

We call them "pepper spots"...

Hi,
what is caused the dirty drum (there are black spots on the surface of drum), as result there are black spots on the paper of copied.
Thank's

After reading to the bottom of the postings, I think I have figured out what you are describing, and Badboys has pointed you in the right direction. You either need to replace your primary charge corona, or rewire it, and clean the grid wires with clean water on a cloth. This should bring an end to your spots.

This is easy enough to diagnose, if the tenth copy looks worse than the first,,, bingo, you have pepper spots!

[blackcat4866]

If the primary has been arcing there will be rows of tiny pinholes in the ASi drum coating. There is no fixing a drum like that. It's been a while since I ordered one of these drums but I seem to recall a price of $3K. If it has been arcing you'd better replace the primary too.

Yep: Canon ImageRunner 5000I Drums
=^..^=

[SCREWTAPE]

Buff the drum. What kind of enviroment is this machine is in.

[andalasgt]

thank's for replies. Here I give you a model test print of blank copy on a4.

[SCREWTAPE]

What kind of print out is this?

Is this a test print from service mode?

A PG type 4 is a good one to use for this kind of issue.

Do you see the spots on the drum?

You can pull out the developer and check the drum for spots.

Keep your filters clean and free of dust, especially for the waste toner cleaning area of the AP kit.

[andalasgt]

Yes, it was printed in service mode. I see the spots on drum. Drum was polished, but after about 250 copies it's coming back.

[teckat]

yes, it was printed in service mode. I see the spots on drum. Drum was polished, but after about 250 copies it's coming back.

change the filters/ check duct seals/
clean fan duct of dirty filters.

check primary post or replace primary unit


Duct.jpg