Ricoh Aficio AP-4510 G065, Service Manual, Page: 224 / 278

DRUM CHARGE
G065 6-20 SM
6.6.3 ID SENSOR PATTERN PRODUCTION TIMING
At certain times, an ID sensor pattern is created on the drum. The ID sensor reads
the sensor pattern and outputs this reading as Vsp and sends it to the CPU where
it is used to calculate Vref (Vsp/Vsg = Vref).
These times are as follows:
Every time the system is powered up
After every 10 prints
•
This number of prints can be adjusted with SP2210-01 (Pattern Interval – ID
Sensor).
•
When the number of prints exceeds 10 during a print job, the ID sensor pattern is
not created and read until after the print job completes.
After every 100 prints
•
This number of prints can be adjusted with SP2973-01.
•
When the number of prints exceeds 100 during a print job, the ID sensor pattern
is not created and read until after the print job completes.
•
At this time, a halftone pattern is added to the standard ID sensor pattern. The
reading from this pattern, Vsm, is used with Vsg (Vsm/Vsg) to calculate the value
to be used to determine the amount of LD (laser diode) power adjustment
required. This method improves consistent greyscale reproduction, slows the
deterioration of the OPC drum, and reduces scatter.
After every 200 prints
•
The halftone pattern is added to the standard ID sensor pattern every 200 prints.
This interval can be changed with SP2210-02 (Large Job).
•
When 200 prints is reached, even if in the middle of a job, the ID sensor pattern
will be made. For example, if the job contains 1,100 sheets, the ID sensor
patterns will be made every 200 sheets, and at the end of the job.
When the front door of the machine is opened and closed
•
The halftone pattern is added to the standard ID sensor pattern at this time also.
The following SP codes are also used for grayscale control. Refer to the SP code
table for full details.
SP Code Name What It Does
2973-01
Grayscale Copy Interval Check Determines how often the halftone pattern
is added to the standard ID sensor pattern.
Default setting: 100
2972-01
Grayscale Upper Limit Sets the upper limit for LD adjustment
based on the Vsm/Vsg calculation.
2972-02
Grayscale Lower Limit Sets the lower limit for LD adjustment
based on the Vsm/Vsg calculation.
3103-04
Vsm/Vsg (Immediate Grayscale
Post-Pattern Output) Displays value used to determine the LD
power adjustment (Normally, Vsm/Vsg =
65% ~ 85%)
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