The output tray is not a customer replaceable part. Due to the age of the printer, support options are limited. You will have to take it to a local repair store. The user guide for the printer can be found here.
If you have an HP authorized service center nearby, you should be able to take it to them and have it checked.
Here is a link to HP Service Centers, by Country/Region: Click here
Hope this helps! Keep me posted.
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