Density sensor out of range?

[browolf]

Our hp colourlaserjet 4500n has recently started saying "density sensor out of range"
and then something about cleaning it.

it seems to be something to do with the paper tray. cos it's not recognising when there is paper in.

anyone know what this sensor looks like, where it is?

cheers
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[browolf]

i found my answer, when i was looking for something else entirely.

This page details solutions for error messages on the hp colour 4k series

http://www.hp.com/cposupport/printers/support_doc/bpl08401.html#P178_5929

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