Xerox WorkCentre 5687 Series Service Manual page 2216

dC905 TC Sensor Calibration
Purpose
To calibrate and setup the Toner Concentration Sensor. This setup is required at manufacture
and after installing a new developer module, (32-55 ppm) PL 9.17 Item 2 or (65-87 ppm) PL
9.15 Item 2.
Description
WARNING
Switch off the electricity to the machine, GP 14. Disconnect the power cord from the
customer supply while performing tasks that do not need electricity. Electricity can
cause death or injury. Moving parts can cause injury.
The TC sensor, located in the bottom of the developer housing, is used in the process control
loop to help maintain the concentration of toner in the developer tank at the optimal level.
The TC sensor needs to be calibrated by adjusting the sensor output to the required target
value for a new developer toner concentration. The sensor output voltage can be adjusted to
the correct level by varying the control voltage applied to the sensor.
The output of the sensor depends on the:
• Magnetic properties of the developer material (this is a fixed value).
• Applied control voltage.
• Developer temperature.
• Humidity.
Procedure
1. Enter diagnostics, GP 1.
2. Select Diagnostics Routines, Copier Routines, dC905 TC Sensor Calibration.
3. Touch the Start button to start the routine, and follow the on screen instructions.
• Message displayed "Only run this routine when a new developer package has been
installed"
• Message displayed "Make sure you have cammed on the developer before starting
this routine."
• The components listed will energize:
– Photoreceptor drive motor.
– Photoreceptor erase lamp.
– Charge scorotron and charge grid.
– Developer bias voltage.
– Main drive motor (to rotate the developer).
4. If the setup fails, a 'TC Sensor Setup Routine Failed' message appears, go to 09-360, 09-
361, 09-362, 09-363 TC Sensor Failure RAP.
General Procedures & Information
dC905
August 2007
6-324 WorkCentre 5687 Family