Image Control - Ricoh FT8680 Service Manual

31 July 1995

1.2 IMAGE CONTROL

1.2.1 Latent Image Control
Q
The figure shows the changes of the drum potential during the copy process.
V :
0
Vd (Dark Potential):
V (Light Potential):
L
Vr (Residual Voltage):
Charge
L
V
0
The drum potential just after charging the drum.
The drum potential just after exposing the black
pattern (Vd pattern)
The drum potential just after exposing the white
pattern (V
The drum potential just after the exposure of the
erase lamp.
Exposure
Black White
Vd
V
pattern)
L
2-3
PROCESS CONTROL
Erase
Potential
Sensor
Vr
L
Drum
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