BOTA ERROR CE40 - Toshiba E-studio 281c Copier

[CE40] Image quality control test pattern abnormality

1.Replace the image quality sensor

2.Set the values of "Image quality closed-loop control / Contrast voltage (08-556)" and "Image
quality closed-loop control / Laser power (08-557)" to "1" (Valid). MEANING Shutdown the machine,press 0+8,while starting the machine, enter 556 then enter 1,confirm it,then press 557 then 1,confirm it.
Below are further instructions in the same way

3.Perform "Enforced performing of image quality open-loop control (05-394)" and make sure it is
completed normally. (Error [CE40] does not appear.)
4.Clear all "Image quality control abnormal detection counter Y to K display/0 clearing (08-573 to
576)"

That is it