HP Laserjet Tray 1 problem with a few models

[hristogeorgiev]

Hello,

Few of the printers in my company are having same problem. The models are HP MFP 475dn, M451dn and CM2320. When i put a paper in tray 1 the paper is recognized. But the printer tries to take paper from tray 2 and makes paper jam. 

It makes it even if its not connected to computer when i print test pages. All settings are set that the printer should take first from tray one. All these models are working correctly through tray 2.

There are some thing that i did and didn't help:

I checked all sensor, they are working correctly. I upgraded the firmware. 

All information will be greatly appreciated.

Many thanks.

[OsSt]

Set the settings to Any Type and Any Size. 
Check if the specific documents dont have set "manual" on paper settings

[hristogeorgiev]

Thanks for your advice but it doesn't help.

[mduncan1901]

@hristogeorgiev exact same issue with my HP Laser Jet 400 nseries M451mw

did you ever get a fix?

[hristogeorgiev]

Unfortunately no. I still have this problem.

[hristogeorgiev]

We have just fixed that. The issue is equal for a few models but the solution is different. I will show you pictures with 3 sensors which made the problem. On the first picture sensor is behind plastic. You have to remove it to clear it. Other two pictures are also showing problematic sensors.