Ricoh Beluga-C1 Training page 181

The ID sensor pattern is created at 100 cm (4 in.) intervals during
the job, and at the end of the job if the job was longer than 100 cm
(4 in.).
The interval (100 cm) can be adjusted with SP3920 or switched off.
Slide 181
ID SENSOR
The main points are on the slide.
For example, if the first copy after an ID sensor pattern check is 90 cm long,
there will be no ID sensor pattern check after the copy (less than 100 cm made).
Then, if the next one is 50 cm long, 140 cm will have been copied since the last
check, so the ID sensor pattern is checked after printing the 50 cm copy.
The interval can be changed with SP 3920.
For example, you may need to reduce this interval if the user copies
originals with a high amount of black, so that the amount of toner in the
developer does not run low.
The ID sensor pattern is used for toner supply control and toner near-end/end
detection, which will be explained later in this section.
ID Sensor
181
Beluga-C1/C1.5 Training