HP Color LaserJet Enterprise M553dn, how to remove CPR sensor?

[Mikhail57]

Color planes mismatch. Full calibration does not help. The windows of the CPR sensor and of the laser have been cleaned but still there are #54 errors: 54.0C.00-03, 54.0F.00-03, 54.14.00.

The last idea is to remove the CPR sensor and look if it has dust inside. I removed two screws, but it does not go out.  Perhaps something else is to be done but I could not find any video on the CPR removal.

Any comments and help are welcome.

[Repairatrooper]

Are these oem or 3rd party toner? Some toners do not image dark enough to allow calibration.

[Mikhail57]

It is an original HP CF360A Cartridge. Now it has about 5% of toner left, but the problem started more than an year ago when the cartridge had about 50% of toner left.

[Repairatrooper]

If you print the PQ quality pages, are the individual colors solid on the page? If not, the toners may not be consistent enough to perform the calibration. You only mention one cartridge, are all 4 OEM at at a reasonable level?

[Mikhail57]

When I print the PQ quality pages, the individual colors are solid on the page. The other (CMY) cartridges are original HP ones 30% full. As I said, the problems started more than one year ago, when they had about 60%.