Theory of Operation 2-25
â– There is a developer problem either with the housing or the amount of beads
in the developer.
ADC Sensor
The sensor in this figure is the Automatic Density Control (ADC) sensor. It is located
on the MOB Sensor Assembly.
To control image quality, this sensor looks at patches that are developed onto the
accumulator belt at various times.
Data from the ADC sensor is used to:
â– Adjust the intensity of each laser in the ROS.
â– Set the look up table for Tone Reproduction Curve (TRC).
â– Determine amount of toner to add to developer (triggered by ATC sensor).
Tone Up/Down Messages
Front Panel Message Typical Values
[CMYK] Sens Warn 0
Pages = XX Number of pages since last check
ATC Control = XXX 565
ATC Corr = XXX 604-606
Ave ATC = XXX 593-615
ATC Vol = XXX 320-428
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