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Reseating the additional memory took care of this one.

Thanks,

FS4200 with a F20C error-can't find anything in the manual about this error. Anyone seen this one?

We had one similar to this and the ROM on the MCU board was the issue.

Yes there are Tech Bulletins to updated DV units and Transfer units. Also we found that roller 6 wears down allowing the paper to rub against the guide and build up the toner. Replace roller 6.