Ricoh FT6645 Manual page 41

PROCESS CONTROL
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 data initial setting as follows:
Apply charge while grid voltage is –700 V to create the ID sensor pattern.
Check the drum potential (V
–700 V grid.
Adjust the ID sensor bias (V
V = V
IDB
= V
Change the bias to the calculated V
V adjustment sequence in the process control data initial setting and V
SG
are used to determine V
V is not changed until the next process control data initial setting is done.
IDB
<V correction timing>
REF
After the series of copies is completed in the case that 10 or more copies
have been made, V
V , V and the current TD sensor output (V
SG SP
Since this V data updating is under fuzzy control, the relationship among
REF
V , V ', V
REF REF SG
formula.
V is updated not only at the above case. But also during developer initial
REF
setting and during process control data initial setting.
V
P
P
–300
V
SP
) of the latent image created by the charge with
P
) so that it satisfies the following formula.
IDB
– (–300) (V)
P
+ 300 (V)
P
data at process control data initial setting.
REF
is updated by referring to the previous V
REF
, V and V cannot be expressed by a simple algebraic
SP TD
V = V +300 (V)
IDB P
and detect V
IDB SP
).
TD
2-16
23 April 1993
–700 V
. V detected during
SG
(V
REF REF
SP
'),