Ricoh FT6645 Manual page 77

DEVELOPMENT
4.4.4 ID Sensor Pattern Bias
Potential
Sensor Detection
V
ID Sensor
Bias Level
4.0 V
ID Sensor Output
While developing the ID sensor pattern, ID sensor bias is applied. ID sensor
bias is determined during process control initial setting as follows:
A charge is applied while grid voltage is –700 V to create the ID sensor
pattern.
The drum potential (V
The ID sensor bias (V
V = V – (–300)
IDB P
= V + 300 (V)
P
V
P
P
–300
V
SG
V
SP
) of the ID sensor pattern is checked.
P
) is adjusted so that it satisfies the following formula:
IDB
V = V +300 (V)
IDB P
2-52
23 April 1993
–700 V