SC548 AND SC990 - Ricoh Aficio 2022 All-In-One Laser Printer

Common error code on them. Reset is normally by power cycling.

https://www.google.com/search?q=Ricoh+MPC2051.+How+to+solve+SC990+error

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Question edited for clarity.

I cleared the SC548 error code on my Ricoh 5000 according to

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Oct 14, 2014 - this sc 548 usually happens when paper jam occurs and user does not properly fit the fuser... also not fiitted properly due to some foreign ...

The Ricoh error code 548 / SC548 is a fusing unit error code. If you are getting this error: Check the fuser unit to see if it is set properly. There are some connections on the fuser unit not making good contact.
Oct 9, 2012

Ricoh Error Code 548, SC548 Fix - Printer, Copier, Fax Machine

https://www.google.com/search?q=Xante+Impress+error+code+SC548

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SC990 means that the hard drive has failed..... It needs to be replaced with a new one or a hard drive from another copier of the same model. Or you can disconnect the finisher.

this is software performance error.but this in most cases will appear on life over of either drum or developer.

sc990 has many reasons first drum unit defeactive and software on machine sluggish

clean PCU and ID sensor
Replace Drum

sc990 is the software problem. replace the HDD of the machine and it should be fine. don't format the hard drive as it might result in laser error code.

The light copies and overtoning is probably caused by the developer going bad. Do you have a service contract on your copier? It's likely time for a whole PM (preventive maintenance) procedure.

The sc990 is probably caused by the copier's condition as well. Once you have the PM done (or at least replace the developer, rebuild the photoconductor unit, and clean or rebuild the transfer unit) the sc990 codes should go away along with the poor copy quality.

sc990 is a non-specific software error. Many times a firmware update will fix it. In the meantime, turning the machine off and back on should reset the code.

If your machine is very dirty or hasn't been serviced in a long time, that could cause the sc990 code as well.

fuser problem . danger . call tech