Minolta Di620, Manual, Page: 30 / 466

M-11
1155SBM0500A
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The following table outlines the controls measures taken to maintain stable imaging.
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The following is a block diagram of the image stabilizing system.
Item Purpose Method
Initial Setup First correct for AIDC sensor disparity
and contamination. Then use
∆
V con-
trol to set initial values for grid voltage
(Vg) and developer bias (Vb).
Set initial values for grid voltage (Vg)
and developer bias (Vb).
Short-Term
Correction Correct for ID drop caused by change
in drum sensitivity. Perform
∆
V control after every 100
copies.
Long-Term
Correction Correct for drop in surface potential
(surface fogging) caused by drum
deterioration. Correct Vg based on cumulative hours
of drum rotation.
Morning Cor-
rection (first
run each
morning) Correct for ID drop caused by low
drum sensitivity when copier is first
power switch is turned ON (before
copier is fully warmed up). AIDC sensor contamination, use
∆
V
control to correct the grid voltage (Vg)
and developer bias (Vb).
Correction
After Pro-
longed Non-
Use Correct for ID change caused by
change in drum sensitivity due to non-
usage for at least two hours in the
standby state. When START key is pressed, use
∆
V
control to correct Vg and Vb before
making the copy.
T/C Correction Maintain the developing unit's T/C ratio
at a constant level.
Use ATDC to control the toner resup-
ply
1155M080CA
IN
γ
Table
V Setting
CPU
OUT
LD
Toner Replenishing Motor
ATDC Sensor
Developer bias (Vb)
AIDC Sensor
PC Drum
Grid Voltage Vg
Rotation Counter
Control Panel
• Settings Control Panel
• Service Mode
Vg Adjustment
ID Setting
γ
Table
• User Mode
Print Density
Forced Toner Resupply
Toner Resupply Timer
5
IMAGE STABILIZING SYSTEM