Canon Color imageRUNNER LBP5280, Service Manual, Page: 29 / 284

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Technical Reference > Image Formation System > Image Stabilization Control > Image gradation correction control (D-half control)
Technical Reference > Image Formation System > Image Stabilization Control > Image gradation correction control (D-half control)
Conditions for execution Execution timing
When 5 hours have passed since the execution of the last
density control
(However, the count of the elapsed time is reset when the power
is turned OFF or the machine enters deep sleep, and the count
starts again when density control has been executed after that.) When shifting to idle state
(*2, *3)
When the environment (temperature and humidity) has changed
by a specified value or more When shifting to idle state
(*2)
When requested by the user After completion of the jobs
in wait
(*4)
*1: This item is used to control the execution timing by executing the following setting: Setup
> User Maintenance > First Calibration > Density Control. There are 3 types of execution
timing.
Off: Not executed (default)
After Jobs: Executed when shifting to idle state (immediately after the machine has completed
all the jobs to be executed)
Immediately: Executed during initialization of the engine
*2: Executed immediately after the machine has completed all the jobs to be executed after
the execution conditions have been achieved. (In some cases, density control is executed
after a job received after achievement of the execution conditions has been completed.)
*3: When the machine is in panel off mode, density control is executed when the execution
conditions have been achieved. Density control is not executed during deep sleep. However,
if the execution conditions are satisfied when recovering from deep sleep mode, density
control is executed when shifting to idle state.
*4: When the execution conditions have been achieved, density control is executed
immediately after the machine has completed all the jobs to be executed (before executing
jobs received after the execution conditions have been achieved).
■ Image gradation correction control (D-half control)
This is a control that main controller PCB executes the gradation correction based on result
of the halftone density measurement that is executed by DC controller PCB.
After D-max control, DC controller PCB and main controller PCB execute the D-half control in
the following procedure.
The conditions and timing for executing D-half control are shown below.
Conditions for execution Execution timing
At power-on Not executed by default
(*1)
Conditions for execution Execution timing
When recovering from deep sleep after 8 hours or more have
passed Not executed by default
(*1)
When the door is closed after replacing the Toner Cartridge Immediately (right after
replacement)
After every 500 pages of printing since the execution of the last
density control
(However, the count of the number of printed pages is reset when
the power is turned OFF or the machine enters deep sleep, and the
count starts again when density control has been executed after
that.) When shifting to idle
state
(*2)
When 5 hours have passed since the execution of the last density
control
(However, the count of the elapsed time is reset when the power is
turned OFF or the machine enters deep sleep, and the count starts
again when density control has been executed after that.) When shifting to idle
state
(*2, *3)
When the environment (temperature and humidity) has changed by
a specified value or more When shifting to idle
state
(*2)
When requested by the user After completion of the
jobs in wait
(*4)
*1: This item is used to control the execution timing by executing the following setting: Setup
> User Maintenance > First Calibration > Density Control. There are 3 types of execution
timing.
Off: Not executed (default)
After Jobs: Executed when shifting to idle state (immediately after the machine has completed
all the jobs to be executed)
Immediately: Executed during initialization of the engine
*2: Executed immediately after the machine has completed all the jobs to be executed after
the execution conditions have been achieved. (In some cases, density control is executed
after a job received after achievement of the execution conditions has been completed.)
*3: When the machine is in panel off mode, density control is executed when the execution
conditions have been achieved. Density control is not executed during deep sleep. However,
if the execution conditions are satisfied when recovering from deep sleep mode, density
control is executed when shifting to idle state.
*4: When the execution conditions have been achieved, density control is executed
immediately after the machine has completed all the jobs to be executed (before executing
jobs received after the execution conditions have been achieved).