Laserjet 3100 false jam error

[geo]

Hello: my usually trusty 3100 is reporting a paper jam condition. When attempting to print or copy, the page appears to print normally, but does not completely exit the printer; a couple of inches are still in the rollers. Pull that (intact) sheet out, paper jam error condition remains. Any suggestions?

Thanks,
Geo

[Brian]

It could be that a paper detection flag is sticking somewhere.

[geo]

Hi Brian--can you describe or point me to a description of flag/sensor locations? I pulled all the plastic covers off the housing, but (although I'm an engineer) I'm a bit reluctant to start random disassembly of the structural innards.

Thanks,
Geo

[Brian]

The 3100 has same enigine as the 5L and 6L, perhaps that helps.
Here you can find diagrams of this machine: http://www.printerworks.com/Catalogs/3100-Catalog/3100-AssblyContents.html

[geo]

Thanks very much for the assistance!

Geo