Toner Supply Control - Ricoh Ch-C1 Series Service Training

 If toner supply is calculated based on the amount of toner
used in covered areas only, errors can increase, especially
when changes occur in ambient temperature and drum
characteristics.
 This makes it difficult to control toner supply only with
pixel counts to maintain constant image density.
 Rather than depend on pixel counts in covered areas,
several ID sensor patterns (Default: 10 patterns) are
created on the drum and ITB between sheets.
 The machine uses two readings to calculate Vtref
 Vsg (reflectivity of the bare surface of the ITB)
 Vsp (reflectivity of the pattern areas covered with toner).
 The value of Vtref is then used to set the toner reference
voltage for the TD sensor.
 This reference voltage is frequently updated with fresh
readings of the patterns to stabilize the amount of toner in
the development unit.
Slide 352
No additional notes

Toner Supply Control

352
Ch-C1 Training