Actually i had SC500 on a 1515 a couple of weeks ago, the customer had ignored the "replace drum" message for a long time, i replaced it with a new pcu, still SC 500, it was the main motor, had to replace it too. Probably gone broken after thousands of copies with overload from the old pcu.
And about MP161 and MP171, we have a lot of these machines, i do not recall having SC500 on none of these.
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