Minolta EP4000 - Image Stabilization System

Interleaf EP5000/EP4000 GENERAL, MECHANICAL/ELECTRICAL
97.04.01
M-11
1149SBM0700A
IMAGE STABILIZATION SYSTEM7
z The following image stabilization controls are provided to ensure stabilized copy
image.
Item Quality Purpose Control
Initial Setting Image density,
gradation
To make initial settings of
grid voltage (Vg), optimum
Exposure Lamp voltage, and
AE Sensor gain.
Sets the initial values for grid
voltage correction, optimum
Exposure Lamp voltage
correction, and AE Sensor
gain adjustment.
Regular correction Image density To compensate for any drop
in image density due to a
deteriorating PC Drum.
Corrects the grid voltage
through AIDC Sensor
control.
Gradation To compensate for any drop
in the intensity of LA1 light
due to a contaminated
optical system.
Corrects the optimum
Exposure Lamp voltage
through AIDC control.
Foggy
background
To keep a given
toner-to-carrier ratio of the
developer in the Developer
Mixing Chamber.
Provides toner replenishing
control by means of the
ATDC Sensor. (For details,
see 13. DEVELOPMENT.)
Correction made
immediately after
Power Switch is
turned ON
Image density,
gradation
To compensate for any drop
in PC Drum surface potential
when the copier is cool
immediately after the Power
switch is turned ON.
Corrects the grid voltage and
optimum Exposure Lamp
voltage through AIDC
Sensor control.
Correction for
Faulty AIDC
Sensor
Image density,
gradation
To compensate for image
density and gradation
aggravated by a faulty AIDC
Sensor.
Corrects the grid voltage and
optimum Exposure Lamp
voltage according to the time
through which the PC Drum
has turned and the copier
has run.
z The following is the block diagram of the image stabilization system.
1136M003AA
AIDC
ATDC
CPU
PWB-A
HV1
PU2
EE
Toner
Replenishing
Image Erase
Lamp LA3
Exposure
Lamp LA1
Original Width Scale
Original Glass
Halftone Patch