LJ M750 does not let me to select A4 paper size

[RadekZ]

It is imposible to select A4 paper size in tray 2. There is the "i" information icon next to A4 paper size and it shows following message "the size is currently unavailable the guide positions do not match the size".

Also when I tried to put custom paper size so it did not cooperate with it.

Could anyone help me with this issue?

Thanks a lot.

[dansdaduk]

So what paper size does a Configuration Report (initiated from the printer front panel) claim is in that tray?

[RadekZ]

Despite there is inserted pack of A4 paper size in tray 2 and both levers are adjusted so configuration page report claims A3 paper size.

[dansdaduk]

This implies either that the paper guides are not quite set correctly, or there is some hardware fault with the levers and sensors (not something I can personally advise on, sorry).

Perhaps @SHThompson or @davidzuts can provide some pertinent advice?

[davidzuts]

Since this is a wide format printer I have seen this issue when regular paper is placed in the tray with the leading edge being the smaller edge.  In other words place the paper in the tray so the longer edge is the leading edge.  You can have paper selected as A4-R or A-4.  The A4-R is rotated where the leading edge is the smaller size.  The printer should realize the difference, however, sometimes the switches on the tray itself do not move to the correct position so the printer does not read the tray size correctly.  If you already have the leading edge as the long edge (11.69 inches), then I suggest you remove all paper from tray 2 and set the side and backstops to A3 size and push the empty tray back into the printer.  The menu should now tell you to load A3 paper.  Now open the tray, move the switches back to A4 positon, load paper in the tray and close the tray.  The menu should now say A4 paper is loaded and give you the choice to change the size.  Do nothing and wait for the message to go away and all should be good.  If it still says A3 then you have an issue with the paper tray switches or the sensors that read the switch settings and you will need to call hp customer care to get service on the printer.

[RadekZ]

Guys, thanks a lot for help. Finally I downloaded Service Manual and checked all sensors (on printer display go to Administration\Troubleshooting\Diagnoistic Tests\Tray/Bin Manual Sensor Tests).

It showed Tray2/SW7 and Tray3/SR3 as faulty.

[SHThompson]

Two bad sensors in an HP printer is highly unusual.

You have said you are running the sensor test but what are you doing to verify that the sensors change state when activated?