I would recommend calling in a service call on your Xerox. The issue could be related to the contacts inside the machine or possibly even a defective toner. Your best bet would be to contact an Authorized Service Provider or Xerox Support.
Thank you, Jordan R. Systems Analyst / Consultant Fiery Certified Professional
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I changed the black toner in my printer, but it appears that the black toner is empty... i insert and remove many times to work... sometimes the printer detects my toner (98%) sometimes shows NO BLACK TONNER..