Lets fire this thread up again as the problem is still hanging around and won't go away, I'm even seeing it on the latest MP 7502's.
We've made all the suggested changes to the SP setting, updated firmware, put shims behind the fuser plug and still getting random shut downs due to SC 54X.
One thing I did discover was that thermisters are a PM item and should be changed every 350K, I'm deeply ashamed that I didn't know that, you work on the same generation of box for years and think you know it all so sometimes it pays to reread the manual.
The only thing I've found that does decrease the incidence is to go to the customers once a month and go around their fleet of copiers and manually clean the thermistors. Not a very cost/time effective way of doing things but it does stop the Sales manager giving me a hard time cos their trying to upgrade the fleet.
Last edited by Lagonda; 07-17-2014 at 11:32 PM.
At least 50% of IT is a solution looking for a problem.
Thermistors are not per say a PM item, but they need to be replaced from time to time and this is account dependent. As all of us know, toner is still collected under the thermistors, even the design was changed and the bracket angle was modified. Toner tends to attach faster if the thermal resistant plastic coating the thermistor terminal presents fine scratches on the surface. You will observe that new thermistors have a longer cleaning interval and after the toner builds up, this interval will be shorter and shorter...that is the moment when you should replace them. The problem is pure mechanical, and all the attempts to correct it trough firmware or settings failed. A better thermistor design is present in Aficio Pro 906/907 and older 1060 or 1100 series but the got the same problem in time accumulating toner under the thermistor...anyway their lifespan was way better.
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