Holycrap's Dell 1600n experience is worrisomely familiar to ours.
Our company ordered two 1600n's from Dell in November 2004. Both were deployed, one in medium duty and one in light duty environments. Initially office staff praised the switch to all-in-one units that replaced their cumbersome printers, faxes, and photocopiers.
Subsequently we replaced the medium duty printer three times. We replaced the light duty unit four times. The two common issues experienced with these units are:
-Unit reports "Paper Out" and stops functioning though plenty of paper is in the tray.
(Dell tech support may recommend entering diagnostic mode on printer to check
the status of the paper tray sensor. Ours always reports finding paper.) Power-
cycling unit may temporarily restore printing functions (though usually not.)
Replacing paper trays does not correct the issue,
Changing brands of paper is also recommended and also does not help.
-Unit dies without warning. Unit is completely dead, no display, no response, though
power verified good and unit switched on. Power-cycling does nothing but give your
index finger a reasonable work out.
Dell replaces with refurbished units, and has failed twice to update information in their system, hence we, too, have experienced the "incorrect service tag" issue. The last replacement printer took an additional two days to process while Dell Tech Support waited for Dell Customer Service to correct the service tag information (with supervisor involvement.)
All fun and games until you have multiple offices rioting with pitchforks and torches demanding blood when they are down five (or more) days while you wait for Dell to ship another replacement. Fortunately your staffs' opinion of you changes completely when the Dell replacement unit arrives and dies in less than twenty-four hours (once for us so far.)
If you have a choice, I highly encourage you to avoid this unit.
If you have already purchased or inherited one or more of these and experience multiple problems, deal directly with Dell technical support supervisors when you call. We received two new (revision A04) replacement units this way, and though one just failed, they lasted longer than any others thus far.