C253 background_help please

[jrf]

C253_Scan.pdfThis C253 started banding and then produced complete background, I have attached a sample. I have changed image units, black print unit, hv board and PWB assembly but still no luck. I would appreciate any help.
Thank you

[fishleg]

Curious that a test print out the machine or copy ?

[jrf]

This is a test print fishleg

[jonw]

what happens when you do a gradation adlustment ?

[acusso1234]

Did you tried a inizialization and a complete calibration?

[jrf]

can not complete gradiation because it gives a test pattern scanning error

[Zeldaman]

Hi there!
I think acusso is right. Your sample looks like the older color-bizhubs when there was made a mistake in the installation-procedure.
try to make a complete set-up all after the installationmanual.
Greetings....

[Mercutio Norway]

I've seen this before, experienced it on a Bizhub C353.
Try change the Printer Control Board. If my memory isn't playing me a trick I had some success with that one.

Best of luck!

After careful re-thinking... My memory was playing a trick on me.
Soz!

[jrf]

Ya waiting on boards now, ill let you know the solution as soon as i sort it.
Thanks for help

[jrf]

Just to update you on this one, The MFPB board was the cause of problem,
Thanks for all your help