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I don't have an answer, but I can add some detail since I have the same problem (6250 that suddenly won't duplex).
I have a wired network with multiple Vista machines connected and have been duplexing just fine for YEARS with the same PCs and same drivers. One day my wife complained she couldn't duplex and I messed around, updated drivers, rebooted everything, etc. etc. and finally gave up and sent the print job from my laptop where it duplexed just fine.
About a week or so later I noticed that my laptop would no longer duplex either! Once again I updated the drivers, rebooted, tried different settings, etc. etc. but no luck.
I'm pretty convinced that a Windows patch has caused this issue (which is why there is a timing difference between my machines). I've rolled back my system to remove several patches and things seem to work fine again, however I'm not exactly sure which patch causes the problem AND within a few days Microsoft reinstalls the patch automatically.
Unfortunately I'm not confident that Xerox will put much effort into fixing this driver problem since this is not only an "old" printer, but I don't think many people do much duplexing (so there won't be many people yelling for help).
I'll let you know if I find a better work-around or fix.
That problem is the registration clutch.
You have to order the registration assembly to get the clutch. It is located on assembly with the black and stainless steel roller, you have to pop out the imaging unit to see it.
But that WILL fix your problem. They changed the style of clutch also. It is more reliable now.
TRY FIRST (Solutions without parts): For a continuous RAMError message, try cleaning RAM contacts and reseating RAM.
NOTE: Third-party or generic RAM is not covered by warranty or service contract and should be removed for troubleshooting purposes.
TROUBLESHOOTING TIPS AND HINTS: Replace RAM. If problem is not resolved, replace the Image Processor board.
Please Note: Intermittent 6250 RAMErrors can be resolved by replacing the Print Engine Board and EEPROM, remembering to Save/ Restore in Diagnostics.
Doubt it be the fuser(100 000life), "just magenta dots".... fuser would be "all smudged" or "black marks" , "the print rubs off" , "paper is creasing or jamming"
Can prove it by stopping a print (open door) when paper is1/2 way threw machine, you need to stop it before it goes threw the hot bit, so you can tell if the hot bit (fuser) puts the marks on the paper.
Transfer roller one would expect to effect whole print Smudged/Faint,uneven density
It will be the imaging unit ( 30 000 pagelife Ouch$ ) or possible leaking toner (if aftermarket)
Remove imaging unit and inspect film you should find image of lines, dots are usually chips or sticky stuff on drum surface, carefull no oily human fingers on surface please.
When stopping machine mid print and perfecting your timing, pull out the imaging unit and look at replica of your print notice if marked and where.