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7.6 BTR UNIT ASSY Control
7.6.1 Detecting the Installation of BTR UNIT ASSY
Whether the BTR UNIT ASSY is installed is detected when the power is turned on, or the front cover is
opened and closed. The sensor for detecting the installation is not provided, but judgment is made from the
output of the SENSOR ADC ASSY.
The light is emitted from the LED of SENSOR ADC ASSY with the specified light quantity, and if the output
of the SENSOR ADC ASSY is larger than the specified value, the controller judges as installation. If the
operation stops by a jam, the toner image could be put on the BTR and in such a case, the sensor output is
reduced, causing the controller to judge as uninstallation. To prevent this wrong detection, the BTR is
rotated by a half turn if the output is less than the specified value. Then, when the output of the SENSOR
ADC ASSY is larger than the specified value, the controller judges as installation, or if less than the
specified value, the controller judges as uninstallation.
7.6.2 Detecting the Life of BTR UNIT ASSY
The BTR UNIT ASSY consists of a BTR and a waste toner recovery system. The life of the BTR UNIT
ASSY is detected when the toner recovery space has become full.
The full toner recovery space is detected by the SENSOR TNR FULL.
1) Check timing of full waste toner recovery space
• When the power is turned on, or the front cover is opened and closed
• When paper is outputted
2) Output of "BTR Life Warning"
The "BTR Life Warning" is outputted when the SENSOR TNR FULL detects the full toner recovery
space.
3) Output of "BTR Life Error"
After the output of "BTR Life Warning", the print count and the toner dispense time are counted up, and
if total counts exceed the specified value, the "BTR Life Error" is outputted.
4) Reset of "BTR Life Warning"/"BTR Life Error"
The "BTR Life Warning" and "BTR Life Error" are reset, if the SENSOR TNR FULL does not detect the
full toner recovery space when the power is turned on, or the front cover is opened and closed.