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How can I fix my Sigma PCC 500C shredder?

My shrerdder comes up with "Overload" sign even when I have only put 2 sheets through.
Arlene, August 2019
Yes the cutters are crusted up with matted paper which goes rock hard. I've just taken mine apart & spent 2 hours working the cutters clean using boiling water to soften the hard scale, it now works as new.

Dennis, January 2020
link Click here to see other fixes for Sigma.