I've bought a second-hand Laserjet 5000DN which, as the suffix suggests, comes with a Duplexer and also a 500-sheet Tray 3. Unfortunately, I can't seem to get the Laserjet to recognise that either are attached.
I think I've ruled it out as a software issue, and I've sent jobs to the printer which I've specified as duplexed and/or tray 3; but it ignores that and just uses Tray 2 (or Tray 1 if there's anything in it). The control panel on the printer doesn't offer any options for Duplex or Tray 3 media types, so I'm assuming it just can't see it, and the problem lies in the printer itself.
I've taken a look at the connections between the base of the LJ and the duplexer, and that seems ok. I've also tried removing the duplexer and just seeing if the LJ will recognise Tray 3 alone. No joy.
Is there anything else I can try or I should look at? Or is this just flogging a dead horse? Apart from this problem of not seeing any additional peripherals, the printer works just fine.