First clean the AIDC sensor and then in service mode -imaging process adjustment - stabilizer make a initialize +image stabilization and after you must to do test in Gradation Adjustment
First clean the AIDC sensor and then in service mode -imaging process adjustment - stabilizer make a initialize +image stabilization and after you must to do test in Gradation Adjustment
Have we tried cleaning the laser slit glass with the magic wand that is on the door. The first scan looks like it is faded in the center. But all the rest, IDC sensors, reset and stabilize and gradation. Good luck.
KEN
In case everything suggested here won't help:
I recall I had a faulty laser unit once (not shure if it was the C220 series or C452 back then). Some mirrors are adjusted via stepper motor and in our particular case the mirror/motor movement got stuck somehow over it's maximum movement because the MFP tried to "over-compensate" something.
I am unable to open/clean printer sensors for the moment. I will do it in the following days and come back with an update.
Until I open it, I discovered in the 'Bizhub C220 Service Manual - Theory of operation' that there is something that controls the skew (that's what I should have put in the title of the thread: SKEW, not gradual SHIFT).
But, in the Service Menu > Machine > Skew Adjustment:
1. my display is different than the one in the manual
2. I did a Skew Reset
2. I changed the Cyan skew values to both min and max values and there was NO change. I wasn't shoure, so I did initialization + stabilization + gradation after changes. Still, absolutely NO difference.
So yes, a stuck mirror motor might be the case. When I will open the printer, I will check both the sensors and the mirror motor (with my limited knowledge).
Again, I want to thank you all for your time and advice.
I attached the pages that explain the skew for this model and my skew adjustment menu. I don't know, but in theory, I think this should be the "software" solution to my problem, but unfortunately it didn't work.
00.jpg01.jpg02.jpg03.jpg
Last edited by Theophilos; 12-28-2020 at 07:00 PM. Reason: PNG Images not attached
If you go that path you have to manually turn the skew drives to a center position. Before re-installing the laser unit use a marker pen on the involving gears so - in case it won't work - at least you can see if one of the stepper motor might not have moved at all during the calibration phase.
In service mode check Counter --> Warning if there's any P-14 counts.
If there is you should use Print head reset option.
After few clicking sounds power off/on the machine and do image stabilization only.
Anyway I would highly revcommend you to clean IDC sensors before anything.
To open fully right door remove small black plastic as mentioned before, and white lower connector (operation panel DVI cable) and remove transfer belt.
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