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OK> only when doing Glass/ The original is exposed to light and read using the contact image sensor (CIS) to read the image on a line-by-line basis.
The flow of analog image processing performed by the contact image sensor (CIS) is as follows:
The light reflected by the original is collected by the rod lens array.
- The light is received by the CMOS sensor array.
- The CMOS sensor array converts the received light to an electric signal and outputs it.
The CMOS sensor array consists of four channels (units).
Each channel is provided with an output correction table to output an image signal after performing gain correction for the input brightness signal.
Contact Image Sensor (CIS)
1) Enter the service mode.
Sequentially press the Additional functions key, 2 key, 8 key, and Additional functions key on the operation panel.
2) Press the arrow key on the touch panel to display "TEST MODE".
3) Press [OK].
4) Press the [2] key to display "SCAN TEST".
5) Press the [1] key to display "SHADING".
6) Press [OK].
After completion of the above procedure, the contact sensor output is compensated and parameters are set automatically.
After completion of automatic adjustment, "OK" is displayed.
did u clean OPTICS ?
- Check whether the optical system is free from dew condensation
- Check whether the optical system (contact sensor/white panel/copyboard glass) is free from scratches, stain, foreign objects.
You can also adjust the Density scale if differences between the image on the original
and the print occur.
Printer Density
NOTE:
The default setting is in the middle ‘5’, on a scale of 1 to 9.
Press (Additional Functions) ➞ [Common Settings]
Press [▼] or [▲] until [Printer Density] appears ➞ press [Printer Density].
Press [Light] or [Dark] to adjust the print density ➞ press [OK].
Press [Done] repeatedly until the Basic Features screen appears.
Adjusting the Contrast (Sharpness)
Place your originals ➞ press [Special Features].
Press [Sharpness].
Low
If you make copies of an original containing halftones, such as a printed photograph,
using the Photo mode, the moire effect (a shimmering, wavy pattern) may occur. In this
case, you can lessen this moire effect by using [Low] as the setting to produce a clearer
copy.
High
This setting enhances the edges of original images so that faint or fine text is reproduced
with a sharper contrast. This setting is particularly suited for copying blueprints and faint
pencil drawn images.
NOTE
• To cancel this setting, press [Special Features] ➞ [Sharpness] ➞ [Cancel].
• To cancel all settings and return the machine to the Standard mode, press
(Reset).
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