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That service code SC550 normaly is a fuser web end error, you must replace the web and reset the % in 1.902 to "0". But i dont think the Ricoh aficio 450 have a fuser web. does this SC550 coming from your Aficio 450?
Clean the fuser thermistors.For reset enter in the service mode : press total clear (yellow)key-107-clear(red)key,touch SP mode,open the front door and turn OFF the power switch.Unplugged the machine,wait 10 sec.,plugged the cords,close the front door amd turn ON the power switch.