Transfer Roller Assembly Control - Xerox phaser 6250 Service Manual

Transfer Roller Assembly Control

Detecting the Installation of the Transfer Roller Assembly
Although there is no seperate sensor for this, the output of the CTD Sensor is used to
detect installation or absence of the Transfer Roller when power to the printer is
turned on, or the front cover is opened and closed.
Light emits from the LED of the CTD sensor with the specified intensity and if the
output of the CTD Sensor is greater than the specified value the controller signals that
the Transfer Roller is present (installed).
If printing is stopped by a jam, the toner image will be placed on the Transfer Roller.
In this case the sensor output result is low, causing the controller to report the Transfer
Roller as missing. To prevent this, the Transfer Roller is rotated a half turn if output is
lower than the specified value. If the output of the CTD sensor is than greater than the
specified value, the controller reports installation of the Transfer Roller. If the output
remains less than the specified value, the controller reports that the Transfer Roller is
not installed.
Detecting the Life of the Transfer Roller Assembly
The Transfer Roller Assembly consists of a bias transfer roller and a waste toner
recovery space. End of life of the Transfer Roller is detected when the waste toner
recovery space becomes full.
The full waste toner recovery space is detected by the Toner Full Sensor.
1.
Status of the waste toner recovery space is checked:
■
When the power is turned on.
■
When the front cover is opened and closed.
■
When paper exits the print engine.
2.
"Transfer Roller is at End of Life" error message is generated when the toner full
sensor detects the waste toner recovery space is full.
3.
"Replace Transfer Roller " warning message is generated if the print count and
the toner dispense time are counted and the total count exceeds 15,000 prints.
4.
"Transfer Roller is at End of Life" error/ "Replace Transfer Roller " warning
messages are reset if the toner full sensor does not detect a full waste toner
recovery space when power is turned on, or the front cover is opened and closed.
Theory of Operation
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