Xerox 7700DX Service Manual - Page 131
Checking the Developer ATC Sensor, Adjustment Calibration: Tone Up/Down, Ave ATC, ATC Vol, ATC Control
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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: 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. Phaser 7700 Color Laser Printer Service Manual 3-101
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