Ricoh FT8680 Service Manual page 39

31 July 1995
1.4.2 V Measuring
02
Start key
Charge
Corona
Exposure
Lamp
Scanner F
R
Drum
Potential
V
Sensor
02
During the process control data initialization, V
the development bias for the ID sensor pattern in continuous copy runs. This
bias cannot be used for the initial part of the copy run (less than 10 copies)
due to the different drum potential after the charge corona is applied.
Whenever the Start key is pressed, the drum potential after the charge
corona is measured at the beginning of the copy run (V
V is used to determine the development bias voltage for the ID sensor
02
pattern which is made at the first copy.
The details will be explained in the Image Density Control section.
V V V V
L2 L2 L2 L2
V V V
L2 L2 L2
is measured to determine
01
02
2-15
PROCESS CONTROL
V
L2
A171D523.wmf
).