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lookzovt
02-02-2009, 11:23 AM
Hello

I have Konica 7255. It prints perfectly A3 in simplex and A4 in simplex and duplex. Quality is more than ok. The problem is when printing A3 duplex. First side is ok, like in simplex, but second side looks like this:

http://www.luksoft.org/test/7255problem.jpg

The problem is in the center and on the edge, as you can see above.

What can cause the problem? I think something in fuser unit, but what should I replace? Why simplex and A4 duplex is ok?

Thanks in advance.

albano
02-03-2009, 11:40 PM
HI, try adust the coronas and check the drum life, developer......change if necessary....

Haroldbfix
02-04-2009, 03:32 AM
I would check charges and check the user paper setting in 36mode to make sure they are set to default. It looks like a drum current issue or bad consumables.

lookzovt
02-04-2009, 08:51 AM
Drum and developer is replaced. What does it mean "dust the coronas", how to do it? I will check paper settings.
But why first side is perfect?

Haroldbfix
02-04-2009, 03:17 PM
Drum and developer is replaced. What does it mean "dust the coronas", how to do it? I will check paper settings.
But why first side is perfect?
The machine treats the second side differently from the first side.

lookzovt
02-04-2009, 04:14 PM
Charging corona wires was replaced, developer also...

Luther
02-04-2009, 04:32 PM
Replace the transfer seperator assembly

lookzovt
02-04-2009, 06:00 PM
Replace the transfer seperator assembly

Do you mean "Transfer and separation corona unit" or separation corona wires or other parts?

Can it be caused by rollers in fixing unit?

Luther
02-04-2009, 06:41 PM
you can try just the wires ,but if you have the entire unit replace it

lookzovt
02-04-2009, 07:45 PM
I have no wires nor unit. It's easy to buy wires (it's cheap and available here).
I will ask man who serviced it if he replaced wires (but I think he replaced wires at charging corona only).

lookzovt
02-15-2009, 04:21 PM
I would check charges and check the user paper setting in 36mode to make sure they are set to default. It looks like a drum current issue or bad consumables.

All paper user settings are set to 0.

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