Ricoh K-C3.5L Service Training page 65

The ID sensor detects the following voltages.
In this way, the reflectivity of both the drum surface and the
pattern on the drum are checked, compensating for any
variations in the reflectivity of the ID sensor pattern or the
reflectivity of the drum surface.
The ID sensor pattern is made on the drum by the charge roller
and laser diode.
Vsp/Vsg is not detected every page or job; it is detected during
warm-up at power on to decide Vref. This is done if the machine
starts warming up when the fusing temperature is 30C or less
(default) after entering night mode or low power mode (SP 2994
specifies the temperature setting).
Slide 65
No additional notes.
Toner Density Control – 3
Vsp/Vsg Detection
Vsg: The ID sensor output when checking the drum surface
Vsp: The ID sensor output when checking the ID sensor
pattern
65
Model K-C3.5L