Image Processing
SM 6-25 D017/D018/D019/D020
Detailed
Descriptions
Also, before lens block replacement, enter the SP mode and note the settings of
SP4-688-001 (DF density adjustments). After lens block replacement, do some copy
samples with the DF, then check the copies, If the copies have background, change
SP4-688-001 to their previous settings, or adjust until the background is acceptable. This
SP code is also used to adjust the DF scanning density, if the scanning densities of the DF
and the platen mode is not the same.
SBU Test Mode
There are two SP codes to create a test pattern which can be used as a diagnostic tool to
troubleshoot problems in the SBU:
SP4907 001 SBU Pattern - Test Pattern change
To print the pattern:
Select the pattern to print.
Touch "Copy Window" then press the Start key twice.
6.5.3 AUTO IMAGE DENSITY
ADS prevents the background of an original from appearing on copies.
The copier scans the auto image density detection area [A] as shown in the diagram. This
corresponds to a few mm at one end of the main scan line. As the scanner scans down the
page, the SBU detects the peak white level for each scan line. The IPU performs the ADS
function in accordance with the peak white level.
When an original with a gray background is scanned, the density of the gray area is the
peak white level density. Therefore, the original background will not appear on copies.
Because peak level data is taken for each scan line, ADS corrects for any changes in
To Next Page
Loading...
