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Did it go into its place formerly?
If so, check as to whether
A. too much paper is in the tray
B. the guides or other appendages and parts of the tray are wrongly positioned
C. are you sure you are not trying to put the upper tray into the lower tray's place, or vice-versa?
If not, are you sure you have the right tray for this model?
And tell me how far the tray goes into its place.