Ricoh V-C3 Technical Training Manual page 404

What Methods are there?
! PID control: this is the default setting
" Uses pixel count
" Uses the ID sensor
" Uses the TD sensor
! Fixed control
" Toner is supplied at a fixed rate each page
" Used only for machine testing, and in certain
troubleshooting procedures. Do not use in the field
for other purposes.
! Do not use SP 3301 to change to fixed supply
mode if the TD and/or ID sensor is broken
" The machine will continue to use PID but with
pixel count only.
Slide 404
# SP 3301 has three settings. But settings 1 and 2 are the same.
# PID: Proportional Integral Differentiation – a type of feedback control
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V-C3 Training