Calibrating The Multifeed Sensor - Lexmark 6500E Service Manual

c
Inspect the white level calibration by comparing the copy to the original test page. Ensure that the lightest visible
shaded squares of the original have similar lightness to the same lightest visible shaded squares in the copy. If
the original and copy pages match, the white level calibration is correct and needs no adjustment. Otherwise,
navigate to: Adjust Calibration Values > Flatbed White.
Note: A small amount of background is normal and acceptable in the copy. Disregard the background when
comparing the lightness level between the original and the copy.
d
Adjust the values, and then touch Submit to save your changes. Increasing the value makes the white level
darker.
e
To check the changes, reload the original test page, and then repeat the Copy Quick Test. Repeat the steps as
needed until you are satisfied with the flatbed white level.
Black Level:
a
Remove all pages from the ADF, then load the printed test page facedown onto the flatbed.
b
From the Diagnostics menu, navigate to: Scanner Calibration > Copy Quick Test.
c
Inspect the black level calibration by assessing the toner saturation of the darkest square of the copy. The
objective of the black level calibration is to find the minimum numeric setting that provides the maximum toner
saturation of the darkest square. Too high of a setting will cause other dark squares to become fully black. Too
low of a setting will result in the darkest square not being as dark as possible.
Note: A small amount of background is normal and acceptable in the copy. Disregard the background when
comparing the lightness level between the original and the copy.
d
Navigate to: Adjust Calibration Values > Flatbed Black. If the darkest square of the copy page does not appear
fully saturated, then increase the value. If several of the darkest squares look equally saturated, then decrease
the value. Select Submit to save your changes, reload the original test page, and repeat the Copy Quick Test.
Inspect the copy page again and repeat this step until the single darkest square is fully saturated, and none of
the other dark squares are as dark as the darkest square.

Calibrating the multifeed sensor

In order for the multifeed sensor to function properly and to detect the presence of multifeed media, the sensor must
be properly calibrated. Any time a new multifeed sensor is replaced, this procedure must be followed:
1
Open the ADF, and remove the separator pad. Close the ADF.
2
Obtain a multifeed sensor calibration sheet (included with the multifeed sensor FRU), and fold it in half such that
the short edges overlap each other.
3
Load the multifeed sensor calibration sheet into the ADF with the folded edge first.
4
Enter the Diagnostic Mode and select Scanner Tests > Ultrasonic Multifeed Sensor Calibration.
5
Press the Submit button to begin the calibration procedure. The calibration sheet will be fed into the ADF.
The test will report if the calibration procedure passed or failed. If the test reports "Passed," then the calibration process
is successfully complete. If the test reports "Failed," then the calibration process failed to complete. If the calibration
test fails, then check the following:
•
Make sure the separator pad is removed.
•
Make sure the calibration page is folded over and feeding into the ADF as two sheets.
• If the problem continues, then make sure the multifeed sensor is properly installed and the cables are connected.
if the problem continues, then replace the multifeed sensor. See "Multifeed sensor removal" on page
Service menus
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4036
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