[10] OPERATIONAL DESCRIPTION
Correcting operation in the image forming section (Process correction operation)
1. Outline and purpose
The operations of the image forming section are corrected in order to maintain stable and high-quality print even when changes occur in the
temperature, humidity, consumable parts characteristics, engine conditions, or other environmental conditions.
The correction is performed by controlling various parameters related to the image forming section (process) operations.
With the above correction operations, stable print quality is always provided, reducing service calls and service time.
2. Image forming section correction operation (Process correction operation)
The following are items of the image forming section correction operations (process correction operations).
a. List
Image forming section correction operations (process correction operations) list
Item No.
Correction operations
Purpose, effect
Execution conditions, operating timing
1
Image density sensor sensitivity
correction (Calibration) (Gain
adjustment)
Allows the image density sensor to always
detect the correct image patch density.
Before process correction operation
2
OPC drum marking sensor sensitivity
correction
Allows the OPC drum marking sensor to
always detect the OPC drum marking
normally.
*
1
3
Developing bias voltage correction
Prevents against density change and
background copy.
*
1
4
Laser beam power correction 1
Prevent against a decrease in print density
due to OPC drum membrane decrease.
Specified rotating time of the OPC drum:
AR-250/280/281/285/286/335/336:
Every 20,000 sec
AR-405: Every 16,600
AR-501/505: Every 15,000
Laser beam power correction 2
Outputs the laser beam power
corresponding to the main charger grid
voltage (to maintain the constant voltage).
Immediately after correction of the main
charger grid voltage (
*
1)
5
Main charger grid voltage correction 1
Corrects a decrease in the charging voltage
due to the OPC drum membrane decrease,
maintains the correct density of print and
prevent against background copy.
Specified rotating time of the OPC drum:
AR-250/280/281/285/286/335/336:
Every 20,000 sec
AR-405: Every 16,600
AR-501/505: Every 15,000
Main charger grid voltage correction 2
Maintains the relations between the
developing bias voltage and the main
charger grid voltage at constant (to prevent
against background copy).
Immediately after correction of the
developing bias voltage (
*
1)
6
Toner concentration correction
Maintains the normal toner concentration to
maintain the proper density of print and
prevent against background copy.
When the developing bias voltage correction
is performed for the voltage higher than the
specified level is made immediately after the
developing bias voltage correction. (
*
1)
*
1 During warm-up after turning on the power.
During warm-up after cancelling SIM 7-1, 24-7, 25-2, 44-2.
After completion of printing when the accumulated print time reaches 30 min from the previous correction.
When the next print is made after the unit is idle for one hour.
3. Details
A. Operating conditions and timing of the image forming section correction operation
(Process correction operation)
The image forming section correction operation (process correction operation) is performed under the following conditions and timing.
1) During warm-up after turning on the power.
2) During warm-up after cancelling SIM 7-1, 24-7, 25-2, 44-2.
3) After completion of printing when the accumulated print time reaches 30 min from the previous correction.
4) When the next print is made after the unit is idle for one hour.
10 – 1
7/13/2000
Содержание AR-250
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