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Phaser 7700 Color Laser Printer Service Manual
3-101
Checking the Developer ATC Sensor
1.
Power-up the printer in Service Diagnostics mode.
2.
Scroll to the Adjustment Calibration: Tone Up/Down menu item. Press
OK. The test displays information regarding the Developer ATC Sensors.
Press OK to read the values for each Developer.
3.
Examine the ATC values for primary color Developer you are
troubleshooting. For a properly operating ATC Sensor, you should look at
the values (yellow shown here) similar to these:
<Tone Up/Down>
Y: SensWarn=0 Pages=34
ATC Control=470
ATC Corr=459
Ave ATC=472
ATC Vol=214
4.
Record the ATC values and then exit Service Diagnostics.
5.
Remove the Toner Cartridge of the color you are troubleshooting.
6.
Print 15 A-size pages of 100% Solid Fills of the primary color you are
troubleshooting.
7.
Turn Off the printer and then power-up the printer in Service Diagnostics
mode.
8.
Re-run the Adjustment Calibration: Tone Up/Down menu item.
9.
Examine the ATC values for the color you are testing. As toner is
consumed but no fresh toner is augered into the Developer Housing, the
toner concentration will fall. In a properly working Developer Housing, the
values Ave ATC and ATC Vol should rise (about 20 points) to reflect this
concentration change. (A change of about 30 points should trigger a
Replace Toner Cartridge message.) ATC Control and ATC Corr should
remain unchanged.
10.
If the ATC values do not change as expected as toner is consumed in the
Developer, replace the ATC Sensor.
Note
For ATC Sensor errors 12, 13, 14, and 15, be sure to
clear the Tech-Rep Faults 09-380 to 09-383 using the
Service Diagnostic’s NVRAM Access: Clear Tech Rep
Fault.
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