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(Optical system dirt correction)
This model perform dirt correction by changing the copy lamp inten-
sity according to the dirt degree in the optical system (the copy lamp
unit, No. 1 mirror, No.2 mirror, No.3 mirror) to prevent against remark-
able degrading of copy quality.
The reference value is the AE sensor output value which is obtained
when the reference plate is exposed with the copy lamp voltage of
67.0V (134.0V) at power ON.
This value is checked with sim 44-08, 09.
CLV
Sim46
(1) Setting the reference value for optical system correction.
Reference plate (Glass holder)
CPU reference value
setting
1 Clean the optical system at every maintenance.
2 Perform Simulation 46-1.
(The previous data are cleared.)
3 After completion of Simulation 46-1, when performing the first
mirror initialization, measure light quantity of the copy lamp.
Obtain the average value from the four measurement values and
use the average value as the reference value for correction.
800ms
CL
Light quantity
measurement
Obtain the average value of four AE sensor values, and store it.
100
200
CLV + (0.7)
Table glass
Automatic exposure
sensor
1234
Reference plate (Glass holder)
CPU
Reference value
>Measured value
Correction data output
300
400
(2) Dirt correction
Reference plate (Glass holder)
CPU
Reference value
>Measured value
Correction data output
1 Measure light quantity when performing mirror initialization.
2 Store the correction data into memory.
3 Reset the register inside the CPU.
5 – 7
Table glass
Copy lamp light quantity "UP"
Automatic exposure
sensor
79.8K
80K
Table glass
Copy lamp light quantity "UP"
Automatic exposure
sensor
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