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This is a fuser fault code. First need to check and repair fuser. Buy a new or rebuilt fuser or replace items that cause problem could be thermistor needs to be replace to over temp sensor is bad and needs to be replace or lamp. Once replace then you can clear code. You can buy. Service Manual will explain how to get into service mode and reset fault code. Or post how to reset code on web
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?
This error is power related... their are two possibilities either... your fuser is blown or your machine needs a reset... here is a link to try the reset...
go to service program 5-810 ( sc reset) press on, turn off the machine an the turn on again. The service code should be gone, if it come back again check for a paper jammeed or wrapping the upper
fusing roller if this is not the case replace the thermistor;
Good luck
Vittorio
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