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23. IMAGE STABILIZATION CONTROL
G. Vm adjustment
(1) Purpose
•
To achieve stabilized intermediate exposure potential regardless of a drop in sensitivity of photosensitive
materials or the stain of the writing system.
(2) Operation
•
While the drums are irradiated with a PWM128 intensity laser beam, the electric potential on the drums are
detected by the drum potential sensor /Y (DPRS/Y), /M (DPRS/M), /C (DPRS/C), and /K (DPRS/K). Accord-
ing to the detected results, the laser MPC value is corrected.
(3) Execution timing
•
When printing has not been performed for 6 hours or longer.
•
Every 1,000 prints.
•
When a change in humidity exceeds 20% from the last time the adjustment is performed.
•
When turning on the sub power switch (SW2) after replacing the materials.
H. Gamma correction control
(1) Purpose
•
In order to correct print density with respect to the original density according to gamma characteristic of
toner images formed on each drum and the transfer belt in relation to the exposure level.
(2) Operation
•
Patch images are created on the transfer belt, and read by the PGC sensor (PS11).
•
The PS11 output level is checked against a predetermined output level with respect to print density, and the
gamma is corrected according to the result.
(3) Execution timing
•
When printing has not been performed for 6 hours or longer.
•
Every 1,000 prints
•
When a change in humidity exceeds 20% from the last time the control is performed.
•
When turning on the sub power switch (SW2) after replacing the materials.
114
Theory of Operation Ver1.0 Sep.2006
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