Ricoh MPc3500 & MPc4500 SC548/SC549

This problem seems to have been cropping up more and more of late, mostly leading to some of our engineers doing full fuser services or simply making up excuses for what is causing the fault.


The technical bulletin attached explains what to do, namely replacing the two sensors which register that the fuser unit is turning, plus the encoders which trigger said sensors. However, the most important procedure is to update the firmware, something which our lot seem to be loath to do.


Additionally, and this was in a much earlier bulletin, these sensors were modified to try to prevent the user from knocking them out of their housing brackets should the fuser be slammed into position.


SC548 & SC549 Technical Bulletin


There’s an inherent problem with the MPc4501 and 5501 type machines which, in some instances, remains unsolved by Ricoh.


Firstly, the error code is not in the service manual so there’s no help there, however there are two technical bulletins to describe this error code.


The code will be triggered by one of a┬ámyriad of things, but it is first necessary to determine whether or not the machine has been accessed via the Web Image Monitor after having recieved an IP fax at the time of the code appearing. If it has, this is fixed by simply updating the network support firmware. If it hasn’t though, things become rather more difficult.


The technical bulletin for a simple SC899 error simply states that “a software error occurred in the GW controller” and this is obviously of little or no use to anyone. It then goes on to say that to fix this you should update the firmware or replace the controller board, however neither of these actions seem to remedy the fault. It has been suggested that disabling unnecessary protocols on the machine could also help; this was equally unsuccessful for me.


Having investigated what the machine was doing when the code first appeared, it seems that a particular print job was triggering the code. This was a report of some length generated by a bespoke software package but, according to Ricoh, these models have an issue when printing jobs with a significant number of pages, normally in the region of 100 or so. Unfortunately there is no fix for this so these reports should be divided up and sent as separate jobs until such time as Ricoh release firmware to rectify this. Once this job was deleted from the print queue, the remaining jobs in the queue were printed without a problem.


Finally, it’s worth mentioning that both SC899 and SC991 are all-encompassing error codes which do not point to anything in particular other than there being a problem in a very general region. This has also been escalated to Ricoh Japan for investigation.





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