Image Stabilizing System - Minolta Di 620 Manual

1155SBM0500A

IMAGE STABILIZING SYSTEM

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