Auto Density Control - KIP 9000 Service Manual

3. 5. 1. 2

Auto Density Control

The Auto Density Control is a process to adjust the actual density to the same level with "Target
Density" in any temperature condition by increasing or decreasing the Developer Bias flexibly.
The Auto Density Control can work when it is set to ON (ON1 or ON2) in the Service Mode 5-AA
(or User Mode E). The Auto Density Control takes Bias adjustment when;
•
the Fuser is colder than 50 degrees centigrade at power on.
•
the inside temperature changes more than 3 degrees since the last Auto Density Control.
•
24 hours has passed with the machine turned on since the last Auto Density Control.
•
any parameter concerned with the Auto Density Control is changed.
•
the Auto Density Control is newly activated or inactivated.
•
the Target Density is changed.
And the Bias adjustment is performed as follows.
1. Some calibration target images (solid black) are created on the Drum, and the Density Sensor
detects the density of these images.
2. KIP9000 takes average for the densities of those calibration target images, and converts it into
a hexadecimal data (Actual Density).
3. The above "Actual Density" is compared with the "Target Density".
4. If the difference between "Actual Density" and "Target Density" is not within the acceptable
range, the Auto Density Control sets another Developer Bias and starts from the procedure 1
again. (Refer to the following [Reference] for the acceptable range.)
5. The adjustment will be finished if the difference of them comes to be within the acceptable
range. If not within the acceptable range, Auto Density Control will try the above procedures
1 to 4 several times.
6. If the density still can not be adjusted to within the acceptable range even after 6 time trials,
KIP9000 will show the Service Call Error E-28.
Reference
Acceptable range depends on the setting on User Mode E (or Service Mode 5-AA).
•
When User Mode E (or Service Mode 5-AA) is set to "ON1", error check is performed
with 5 times of "strict check level" then 1 time of "normal check level".
•
When User Mode E (or Service Mode 5-AA) is set to "ON2", error check is performed
with 6 times of "strict check level".
Error check level
Normal check level
Strict check level
Calibration target images
Drum Density Sensor
Acceptable range (Unit : Hex.)
+/-20
+/-1
3-23
Densitometer value
+/-0.3
+/-0.05
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