HP CP4025n Printer Reports Out of Paper but tray is full

We have a two year old HP CP4025n printer that reports it is out of paper, but the tray is full. After various physical manipulations (opening and closing the tray) it will recognize the paper is there and start printing.

Is there a field-replaceable sensor or some repair kit that might resolve this issue?
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Sean ReeseExecutive Support ManagerCommented:
Try installing the Universal print driver from HP to see if that fixes it. It has worked on several of our HP printers having various issues.
IronsideSecurityAuthor Commented:
Sean - thanks, we are running the UPD PCL6, originally v5, but when this issue started occurring I upgraded to v6 and the issue remained.
Sean ReeseExecutive Support ManagerCommented:
Is this a MS box? If it is, have you tried running the MS fix it tool? It could also be something related to the print spooler service in windows.
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Danny ChildIT ManagerCommented:
There's probably a drop-down finger inside the paper tray that senses whether the tray's empty.  Can you see if this is sticking?

I would be surprised if this was part of a maint kit though.  

See p43 of the Service Manual

Looks like an engineer job to me though.  Either the tray's not lifting to hit the sensor, or the sensor's dead.

Does your printer have multiple trays?  If you remove one, is it fine on the other?

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IronsideSecurityAuthor Commented:
Sean - we had actually moved the printer from a Server 2008 host to a Server 2012 host and the problem has persisted. Nonetheless, I will give the FixIt tool a shot tonight (its running on an RD Server, and I don't want to risk impacting other users).

Dan - the printer is unfortunately at a different location than I am, so I have been limited to what the end users are telling me. I will probably have an opportunity to be onsite with the printer tomorrow and will check the drop-down finger.
Sean ReeseExecutive Support ManagerCommented:
I forgot to ask, is this affecting multiple users or just one since it is a networked printer?
IronsideSecurityAuthor Commented:
Sean - It's affecting all users.
wyliecoyoteukIT directorCommented:
most likely a hardware fault, as suggested above.
Either the lift mechanism is slipping, or the sensor is sticking, probably the former if it is solved by removing and replacing the tray.
IronsideSecurityAuthor Commented:
Thanks guys for all of your input. It looks like it was the drop down finger, there was not a maintenance kit that included it, but some manipulation seems to have freed it up.
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