Xerox Phaser 6200B, Service Manual

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312 Phaser 6200 Color Laser Printer - Service Manual
Toner Control
Toner Cartridge installation is detected by the Toner Present (CTG-In) Switch, and
the presence of toner is detected by the Toner Low Sensor. These switches and
sensors are provided for each respective color (CMYK), and detection is made for
each individually.
Toner Low Sensor
The toner low sensor checks one color every 3.5 seconds, requiring 14 seconds to
detect all four colors.
The toner low sensor is attached to the Toner Cartridge Holder Assembly and detects
the presence of toner dispensed by the toner motor from the toner cartridge into the
auger tube.
The toner low sensor can make a false detection if toner has stuck to the sensors
surface. To prevent this, a film attached near the auger in the toner cartridge holder
assembly cleans the sensor surface whenever toner is dispensed. This film rotates
with the auger as toner dispenses scraping toner off the toner low sensor surface.
The toner low sensor may detect toner even if toner is not present or may not detect
the toner even if toner is present, depending on the film position when the toner motor
stops. This is avoided by the printer’s internal toner presence control.
Toner Presence Control
1.
Checks toner presence when the power is turned on, or after the front cover is
opened and closed. Every 14 seconds
2.
The "Toner Empty” warning is displayed when the toner low sensor detects the
toner is empty two or more times consecutively and if toner is dispensed during
the time of detection.
3. The "Replace Toner Cartridge" error is displayed when the toner dispense time
count exceeds the specified value.
4. “Reseat or Replace Toner Cartridge [C] [Y] [M] [K]” error or warning displays
when the toner is dispensed for 1.5 seconds after toner cartridge installation is
detected. At the next toner control timing, if the toner low sensor detects toner
present, the "Toner Empty Warning" and "Toner Empty Error" are reset. When
toner is dispensed and the toner low sensor detects toner present three or more
times consecutively, the controller regards this status as "toner presenct".