Ricoh V-C3 Technical Training Manual page 407

When is Toner Supply Adjusted? - 2
! Every 10 pages using an ID sensor pattern; Vtref adjustment
" An ID sensor pattern is made on the ITB (see below)
" If the pattern is too dark, Vtref is increased. As a result, toner
supply will be decreased, because toner supply is based on Vt –
Vtref.
" If the pattern is too pale, Vtref is decreased. As a result, toner
supply will be increased, because toner supply is based on Vt –
Vtref.
Slide 407
# There is a TD sensor for each colour, but only one ID sensor for C M and Y. This
Vtref adjustment gives an independent adjustment for each colour
# The same Vtref is used for 10 pages. Then the process is done again.
# The 10-page interval can be changed with SP 3102.
# This feature can be switched off with SP 3042 001
Rear of Machine
Belt Rotation Direction
407
V-C3 Training
ID
Sensor