Ricoh C211 Service Manual page 427

Corrected Waveform
Peak Hold of Background
1
V
PH
Corrected waveform x 92% (830)
Corrected waveform x 80% (950)
/
1.7V
(Black Level)
2) Photo Mode --(Selector 2Switch2 ON)
The
VH
of the A/D converter is set to 80°/0 (92°/0 : 830) of the potential difference
between 1.7 volts and the output from the D/A converter (converted shading
distortion data). This corrects for shading distortion as well as matching the output
level to the original background because the reference level of the D/A converter is
set to the original peak hold level.
Also, VL is set to 6°/0 of the potential difference between 1.7 volts and the peak hold
level of the original.
2-1 5B
Rev. 8/89