2-14 Phaser 6300/6350 Color Laser Printer Service Manual
Toner Control
Toner Cartridge presence is detected by a combination of the Toner Sensor Actuator
and CRUM Reader. Presence of toner in the cartridge is detected by the No Toner
Sensor. These sensors are provided for each toner color (CMYK), and detection is
made for each individually.
No Toner Sensor
The No Toner Sensor located on each Toner Cartridge Holder checks one color every
3.5 seconds, requiring 14 seconds to detect all four colors. The sensor detects toner as
it’s dispensed from the toner cartridge into the auger tube.
To prevent false errors resulting from toner obscuring the sensor, a film attached near
the auger in the Toner Cartridge Holder cleans the sensor surface whenever toner is
dispensed. False errors related to toner detection are avoided by the printer’s internal
Toner Presence Control.
Toner Presence Control
1. Checks for toner presence when the power is turned on, or after a door is opened
and closed. Checks every 14 seconds when printing.
2. The "Replace [CMYK] Toner Cartridge" error displays when the counter on the
Customer Replaceable Unit Monitor (CRUM) indicates that the toner is empty.
3. The "Replace Toner Cartridge” error displays when the No Toner Sensor detects
that a cartridge is empty.
4. When a new Toner Cartridge is installed prior to receipt of a "Replace Toner
Cartridge” error, toner is dispensed for 1.7 seconds. At the next toner presence
control sampling, if the No Toner Sensor detects toner present, all Toner
“Warnings", and "Errors" are reset. When toner is dispensed and the No Toner
Sensor detects toner present three or more times consecutively, the controller
regards this status as "Toner Present".
5. If the No Toner Sensor does not detect toner, toner is dispensed for 1.7 seconds
again 5 seconds later. If toner present is not detected after executing toner
dispense three times and if Toner Cartridge dispense time is 0, the “Remove
Ribbon From ‘x’ Cartridge” error displays.
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