Brother International MFC 8890DW Service Manual - Page 60
New toner detection, The high yield toner cartridge only has Rib A on gear 4.
UPC - 012502622673
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3.4.3 New toner detection (1) The main motor will drive gear (4) through the interconnection of other gears. (2) When gear (4) is rotated, rib A on that gear will push against the new toner actuator; the new toner sensor will detect the actuator motion, and the toner sensor detects that a new toner cartridge has been installed. (3) The standard toner cartridge has Rib A and Rib B on gear (4). When the toner actuator is pushed twice, the two signals that are generated by the new toner sensor, tell the machine that a standard toner cartridge has been installed. (4) The high yield toner cartridge only has Rib A on gear (4). When the toner actuator is pushed once, the signal that is generated by the new toner sensor, tell the machine that a high yield toner cartridge has been installed. Toner cartridge New toner actuator Relay front PCB ASSY Gear (4) New toner sensor Gear (1) Gear (2) Fig. 2-21 Rib B Rib A Gear (3) 2-22 Confidential