MPC2050 - problem line

[hmac]

I have on my mpc2050 black lines that appear on
pages.

Copies B / W: 3 black lines
Color copies: 1 line every 13mm on all the
page

I change the optical unit which is under the drums, the hard disk and RAM strips.
The copier in one week.

The lines are copies and printing.

[rsyarcia]

how many copies this machine has? you have to clean the charge rollers

[hmac]

how many copies this machine has? you have to clean the charge rollers

100 color copies

200 N/B copies

CHarge roller is clean, the machine one week.

[rsyarcia]

can you print the test pattern and post it here

[kopirmaster]

cheka up laser unit,

[brodera]

Check the scanner glas and the moving Mirrors.

[hmac]

cheka up laser unit,

I change the laser unit is always the same.

[hmac]

Check the scanner glas and the moving Mirrors.

This is not the scanner because I have also the problem when printing.

[TonerMunkeh]

I think your next step is the controller board. Make sure you get the correct one though, there's 4 different ones.

[hmac]

Here is an example of my failure

[brodera]

woooow... humm.. have you checked the paper before it hits the fusing unit? make a print and then open the left side and cause a paperjam manualy before it hits the fuser (Can be tricky)

Also check the transferbelt and ITB after that.

//Best Regards

[hmac]

I find the problem!
It's the controller board is defective. I replace with a new one is his work.
Thank you for your help.