I have also purchased an 8200N with only 700 pages on it and I have now purchased a defunct 8200DP so that I can use the duplex/hard disk elements. This has a clogged printhead, not sure why the owner didn't just replace it.
The printhead can be very expencive if you have to actually pay for it. If you are using 3rd party, Non-Xerox ink, most will come with a warranty that will cover printhead replacement. Be warned though, the NonXerox ink can be BAD for these printers. We have an older Phaser 850, and have had no problems with it. We were low on ink, and rather than wait for the Xerox brand ink, we had some ink from a 3rd party who I will not name here, and about 1 week after using the nonXerox ink, we now have some clogged jets.
Is the duplex mechanism common to both machines or is there a mechanical element apart from the prom and memory which needs to be transferred.
The duplex unit is the same in both printers, and is installed in even the base model, it's just disabled by way of the ROM chip on the main board. The ROM chip is how the printer determines if its got the duplexer, or Hard drive, or network, etc... You'll need to change this little 8 pin ROM chip off the main board, when you bring over the HDD and whatever else.
Timothy N. Couch
A1 Printech, LLC
Anchorage, AK