HP Designjet T3500 Production eMFP - Manual (Page 236)

Actions
1. Turn your original 90 degrees and repeat your scan.
2. If the problem persists, open the scanner lid. Clean the motor wheels (small black rubber) and the
pressure rolls (wide white plastic). Check that all the pressure rolls can move freely. If you find dust
particles or objects that obstruct the movement of the rollers, try to remove them, then close the
scanner lid and repeat your scan.
3. If the problem persists, restart the scanner by turning it off and on again. If you find an error message
on the front panel during this operation, call HP support and report the error message. If no error
message appears, try repeating your scan.
4. If the problem persists, analyze patterns 4, 13 and 14 of the diagnostic plot. The plot should look like
this:
If you see an image resembling the incorrect examples below, call HP support and report an “incorrect
paper advance” problem.
Vertical black band 20 cm wide
Your scanner contains various different CIS modules, each of which covers an area 20 cm (7.9 in) wide. If one
of the modules fails, and the scanner hardware check does not detect the failure, you may see a black
vertical band, corresponding to the area covered by a single CIS module, in your scanned image or copy. Here
is an example (on the right). Please note the black arrow indicating the scanning direction in this example.
Original Scan affected by a CIS failing module
Actions
1. Open the lid of the scanner and check that the five CIS modules show blinking red, green and blue lights
alternately. If a module is failing, call HP support and report a “CIS module illumination” error.
2. If all the modules lit up correctly in the previous step, restart the scanner by turning it off and on again.
If you find an error message on the front panel during this operation, call HP support and report the
error message. If no error message appears, try repeating your scan.
226 Chapter 22 Troubleshooting scan-quality issues ENWW