6-14 Phaser 7750 Printer Service Manual
ATC Sensor Setup
The automatic toner concentration (ATC) sensor measures the toner to bead ratio in
each developer. These sensors have an intrinsic gain and output value that are stored
in printer NVRAM. New values must be entered when a new developer housing is
installed. Incorrect values have color balance effects.
On the side of each developer housing assembly is a small tag with a bold-faced
three-digit number printed near the bottom. The first digit is always "0." The other
digits range between 0 and 99.
To set the new values:
1. Enter Service Diagnostics.
2. Highlight Adjustments/Calibrations menu and press OK.
3. Highlight ATC Sensor Setup Test and press OK.
4. Note the current values for the tag numbers on the front panel display. They
should correspond to the tag numbers of the developers actually installed.
5. Select the color of the developer you installed.
6. Enter the tag number. Use the Back and Info buttons to select which digit you
want to change. Use the Up and Down buttons to actually modify the digit.
7. Press OK to enter the data in engine NVRAM.
8. Press any button to abort the test.
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