PIXEL COUNTING TO DETERMINE WASTE TONER SUMP END-OF-LIFE
Original Publication Date: 1999-Aug-31
Included in the Prior Art Database: 2004-Apr-09
Xerox Disclosure Journal
Disclosed is a method of pixel counting used in electrophotographic printing machines to prevent overfilling of the waste toner sump in the copy cartridge. The customer adds toner to the copy cartridge. Depending on area coverage used, it is possible for the waste sump to fill up before the cartridge reaches end-of-life. When this happens, toner contamination, noise, machine damage, and customer annoyance will result. Using the pixel counter, however, allows for calculation of waste toner consumption on each copy. After each copy, the pixel equivalent of 35,000 six-percent area coverage copies is subtracted from a waste toner pixel bank. When the pixel bank reaches an equivalent of 4,000 copies, a Customer Replaceable Unit (CRU) reorder mimic is displayed on the User Interface (UI). At zero copies, an error code is displayed and the machine is inhibited to prevent damage.