DRUM UNIT
SM 6-63 B064 Series/B140 Series/G126
Detailed
Descriptions
ID Sensor Calibration (Vsg)
After power-on, Vsg (the ID sensor output from reading the bare drum) is set to
4.00±0.2 V by changing the intensity of the light from the sensor shining on the
drum. This can also be done at any time with SP3001-002 (ID Initial Setting – Vsg).
The calibrated ID sensor output will be used for calibrating the TD sensor
(described below).
NOTE: If the ID sensor output cannot be adjusted to the standard, then after 20
seconds SC353 or SC354 is issued. Toner supply during copying will then
be controlled using the TD sensor only, until the machine is repaired.
TD Sensor Calibration (Vref)
Next, Vref (TD sensor reference voltage) is updated using the latest calibration
values from the ID sensor.
Vref is updated to stabilize the concentration of toner in the development unit. By
shifting the value of Vref, the density of the ID sensor pattern image is controlled.
Toner supply control is covered in the Development and Toner Supply section.
Vref is determined from a table in the machine software, using the following values:
• Vsp/Vsg
Vsp: ID sensor output when checking the ID sensor pattern.
Vsg: ID sensor output when checking the bare drum.
• Vref-Vt:
Vref is the TD sensor reference voltage
Vt is the current output voltage of the TD sensor.
NOTE: If the ID sensor could not be calibrated during the latest process control
(when measuring Vsg), then the previous ID sensor value is used.
If the ID sensor output is abnormal when measuring Vsp, SC350, 351, or
352 is issued, and Vref is not updated (the machine uses the previous
value).
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