Xerox Phaser 6360, Service Manual, Page: 57 / 564

Phaser 6300/6350/6360 Color Laser Printer Service Manual 2-13
Theory of Operation
Transfer Roller Control
Detecting the Transfer Roller
The CTD (ADC) Sensor is used to detect the presence of the Transfer Roller.
This determination is made whenever power is turned on, or a door is opened
and closed.
If the output of the CTD (ADC) Sensor is greater than the reference value the
controller signals that the Transfer Roller is present. If the sensor output is
lower than the reference, a Fatal Error indicates that the Transfer Roller is not
installed.
If printing is stopped by a jam, a latent image remains on the Transfer Roller.
To prevent a false error, the controller rotates the Transfer Roller a half turn. If
the sensor output remains below the reference, a Transfer Roller missing error
is generated. Otherwise, the sensor output indicates that the Transfer Roller is
present and no additional error is reported.
Detecting Transfer Roller Life
The Transfer Roller consists of a bias transfer roller and a waste toner
recovery space. Transfer Roller end of life occurs when the Toner Full Sensor
detects that the waste toner recovery space is full.
1. Status of the waste toner reservoir is checked:
a. When the power is turned on.
b. When a door is opened and closed.
c. When paper exits the print engine.
2. Transfer Roller is at End of Life warning message is generated when the
Toner Full Sensor detects the waste toner reservoir is full.
3. Replace Transfer Roller error 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 warning and Replace Transfer Roller error
messages are reset if the Toner Full Sensor does not detect a full waste
toner reservoir when power is turned on, or a door is opened and closed.