Question about Xerox Phaser 7750DN Laser Printer
The Black ATC sensor detects an insufficient amount of developer. Remove fuser and visualy check black developer housing. Does developer even on magnetic roll?
If this failure reoccurs three times successively, you will need to clear Tech Rep Fault in service mode.
Posted on Nov 20, 2013
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Posted on Jan 02, 2017
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The Yellow ATC Sensor detects a low TC (toner concentration).
- Check that Toner/Developer is present.
- Check the Yellow ATC Sensor for contamination. Ensure that the sensor is seated correctly.
To clear this fault, enter Component Control and set the value of NVM location 752-109 to 0.
This can be caused by many things. I've seen broken Drum contacts from improper drum installation causing Developer bead carryover. Toner dispense motor assy's failing. Developer Housing failure. DVHVPS failure.
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