Density Lock - KIP 9000 Service Manual

3. 5. 1. 1

Density Lock

Density Lock is a process to provide "Target Density" to KIP9000, which is performed in the factory
in most of cases. (This may have to be done in the field very rarely.) This process is very important
as the Target Density specified here will continue to be the expected density applied on all
print/copy afterward.
Density Lock is performed in the factory in the following method. (Do as the same if you will set the
Target Density again in the field.)
1. Set the Auto Density Control to OFF on the Service Mode 5-AA to get rid of any effect by the
variation of temperature during the Density Lock process.
2. Print out any solid black image (Test Pattern #2 for example), and measure its density with a
densitometer.
3. If the solid black needs to be much darker, increase the value of Developer Bias in the Service
Mode 4-19. (Or decrease the value if the solid black needs to be much lighter.)
4. When the density of solid black is successfully adjusted to "expected density" level, perform the
Density Lock immediately in the Service Mode 9-0b.
NOTE
The Developer Bias adjusted in the former procedure 3 can produce the "expected
density" only in the limited temperature situation. If time passes and the room
temperature changes, this Bias may no more be able to produce "expected density".
Therefore the Density Lock must be performed immediately after the adjustment of
Developer Bias before the room temperature changes.
5. When Density Lock is started, the LED of Density Sensors
throw light onto the bare Drum surface, and the reflection from
the Drum is detected. If the reflection does not satisfy the
specified level, the light intensity of LED is automatically
calibrated. The Density Sensor is initialized by this process.
6. After the initialization of LED, some calibration target images (solid black) are created on the
Drum with the current Developer Bias setting, and the Density Sensors detect the density of
these images.
Calibration target images
Drum
7. KIP9000 takes average for the densities of those calibration target images and converts it into
a hexadecimal data. This is hexadecimal data is memorized as "Target Density" in the Service
Mode 5-Ab.
Density Sensor
3-22
Density Sensor
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