Ricoh FT4227 Manual page 279

DRUM CHARGE
3.3.7 Total Grid Bias Voltage
The total grid bias voltage for each mode is determined by the CPU as
follows:
(1) ADS Mode
Vgi(–745 V) + V
ADS Density(SP34)
(2) Manual ID Mode
Vgi(–745 V) + Manual ID Correction + V
Correction + V
(3) ID Sensor Pattern Detection
Vgp(–500 V) + V
(4) V Pattern Detection
R
Vgp(–500 V) + V
(5) V Pattern Detection
L
Vgi(–745 V) + V
(6) Non-Image Area
0 V
Correction + V
R R
Correction
G
Correction
G
Correction
G
Correction + V
R R
2-24
Data Correction + V
Correction + V
R
Data Correction + V
12 February 1992
Correction +
G
Data
R
Correction
G