Develop ineo+ 6500 Service Manual page 144

Theory of Operation Ver1.0 Sep.2006
E. Maximum density correction control
(1) Purpose
• To keep the maximum density constant regardless of the ambient condition and the number of printed
pages.
(2) Operation
• The maximum density correction method differs in each color of Y, M, C, and K.
• The correction of Y, M, and C.
The target value of each toner adhesion stored in the NVRAM board (NRB) is used for the correction.
A patch image is created on the transfer belt using the maximum exposure level, to be read by the PGC
sensor (PS11).
According to the detected density, a target range of developing bias is calculated and determined for devel-
opment.
• The correction of K.
A gradation patch image is created on the transfer belt using the intermediate exposure level, to be read by
the PS11.
According to the detected density, a target range of developing bias is calculated and determined for devel-
opment.
(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.
F. V0 adjustment
(1) Purpose
• To charge the drums appropriately compensating for deterioration of related parts, and the effects of ambi-
ent conditions.
(2) Operation
• A voltage applied to the grid is adjusted so that a target electric potential is obtained. The target potential is
determined according to the developing bias calculated at the maximum density correction control.
• The electric potential on the drums are detected by the drum potential sensors; /Y (DPRS/Y), /M (DPRS/M),
/C (DPRS/C), and /K (DPRS/K).
(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.
23. IMAGE STABILIZATION CONTROL
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