Epson AcuLaser C900 - Page 94

EPSON AcuLaser C1900/AcuLaser C900 Revision B
Operating Principles Image Stabilization Control 94

Laser light adjustment control
Adjusts the quantity of laser light to ensure a constant black and white lines
reproducibility and a constant amount of toner consumed relative to environmental
variations and change with the lapse of time in photoconductor characteristics,
development characteristics or electric change characteristics.
 Gamma correction control
Forms a pattern on the transfer belt, measures the density of the pattern with the
AIDC sensor and sends the measurement result to the controller for correction of
pixel depth.
 Timing for control operation
In the image stabilization control, each control item is executed as required depending on
the circumstances.
Note "*1": When 1000 sheets or more have been printed since the previous processing of A was
executed.
"*2": When 200 sheets or more have been printed since the previous processing of A or B
was executed.
 Temperature/humidity sensor
The output voltage is determined from the value calculated by ATVC control and the value
(environment) detected by the temperature/humidity sensor.
Table 2-6. Operation Timing
Timing for Control Operation Processing
At detection of new intermediate
transfer belt
A
Ds correction control
→ LED light adjustment
control
→ Belt surface level correction control → Solid
color toner adhesion control
→ Laser light adjustment control → Gamma
correction control
At detection of new Photoconductor
Unit/Toner Cartridge
At environmental change
After 1000-sheet printing
*1
After 200-sheet printing
*2
B
Solid color toner adhesion control
→ Laser light
adjustment control
→ Gamma correction control
At indication by controller
C
Gamma correction control
Humidity
data
Temperature
data
Main Board Assy (PWB-A)
Temperature/humidity
sensor (HS1)
High Voltage Unit (HV)
Secondary Transfer Bias
ATVC control