How to output bin empty ?

There must be a problem with the output sensor, dirty, bent or clogged. Check all the paper paths and if possible reset the error code. Regards, Mike

Probably just a bad sensor or dirty sensor causing the issue.

Stacker or stacker/stapler output bins

For the 3,000-sheet stacker or 3,000-sheet stacker/stapler, the output bins are the upper bin (face-up) and the lower bin (face-down).

The upper bin (face-up) is the top bin on the stacker or stacker/stapler. This bin holds up to 100 sheets of paper in face-up order as they exit the printer. A sensor causes the product to stop when the bin is full. Product operation continues when you empty or reduce the amount of paper in the bin.

Lower bin (face-down) is the lower bin on the stacker or stacker/stapler. This bin holds up to 500 sheets of paper and can stack or staple jobs. This bin is the default output bin.

There are plastic flags in the output bin that may be stuck.

Hello,

This error is cause by either having your output paper bin full of paper or the flag sensor out of alignment where the paper comes out of the top. Look at the top f the printer where the paper comes out and you should see a black plastic sensor flag, it should move freely. If it is stuck remove the top cover above it and try to free it so it can move. Below is a picture of the printer with the output sensor flag circled.

After print paper reaches upper bin, you can observe a flag moving while paper coming out. once this flag is stopped moving printer treates bin full..check the flag is moving freely. open top cover clean this sensor.

Hi, Remove all the papers from out put bin & check if not solved remove both side and top covers absorve right side of the out put bin flag sensor clean it with high pressure air or clean with dry cloth gently. Best of luck...Vinay

I have to assume that it is empty.
Stand at the back of the printer.
At the very top, facing you is the output bin.
It's black.
There is a plastic rod that goes across the bin. It has 'fingers' attached to it that direct the paper to lay flat. It should move up and down using your finger. Make sure that it isn't jammed in the up state.
If it is free moving and you still get the error, the sensor is probably bad

HP says: 1) remove all printed pages from output bin 2) "flick" the output bin lever with your finger
If fault continues, contact HP.

In the middle of the paper path at the output bin is a plastic tab that can hang up. Push it down to see if this enables printing to resume.
That tab is connected to a lever that you can see when the top cover is open.
Good luck.