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The sensor is located on the left side of the drum cartridge it is a sensor that is covered with a white cover to the rear of the drum you must remove the drum to see it clean with cloth not a vacuum cleaner Static from vacuum can destroy it. The clear glass sensor is for paper jams! Located in the middle of the cartridge. Mite also want to know when the last 250K copies PM was done?
Solution...this problem is due to color correction unit PGC Sensor. While reading the maximum density this problem has occurred. This centre sensor is also called Gamage sensor.
It is situated at the top left side opposite to Image transfer belt unit for reading the patches as well as maximum density.
The problem is due to dust or toner scattering in these 3 sensors.take out the unit thorowly clean all the three sensors including the contact sockets.
Ensure that all the three shutters are opening properly for all the three sensors.
The centre PGC Sensor is covered with two white tabs.please gently remove them and remove the toner by cleaning.there are chances for toner accumulation under these white plastic tabs.
After cleaning all sensors fix it and do auto Gama adjustment.and color registration adjustment.
PGC and other left and right sensors of the color registration/correction unit also gives 45-20error most of the time either due to dust or due to non opening of the shutters
This error message is displayed by the printer when paper is jammed in one or more locations. In such a case, users are recommended to remove the jammed paper from the specified location. The entire paper path must be checked for any pieces of paper. To stop the message, open and close the top most cover of the printer. Lastly, verify the flags and the sensors. If the problem persists, the cause of the error message could be a broken sensor or sensor lever.
change or clean the pickup roller for the first tray, and make sure no small paper stucking on sensor , check the sensor if its on right place or not broken. and u will be fine.
Clean the pickup rollers by alchohol
there are two black plastic flags that detect paper jams. one is high up just below the fuser unit. The other is roughly half way up the printer between two small transfer rollers very close to the opto sensor. Apparently it frequetly gets jammed behind the plastic cover, and once jammed you would never realise it is there.
I managed to prise it out from behind the cover and the "paper jam at transfer roller" message was cleared.
Unless you know it is there and hiding it is not obvious at all that anything is wrong.