Printer Repair Questions? Ask IT Technicians for Answers ASAP
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What that red error light means, depend upon which light it is.
If it is the toner light, you have a toner system problem, possibly low toner sensed. (How long ago did you change out the toner, and how many pages have been printed since then? if very high-density or graphics-rich pages, count them as 2 (two) pages each.)
If it is some other light, it means something else... if so, please let me know in Reply To Expert, in order that I may help you further with this case and offer more advice.