HP Designjet T3500 Production eMFP - Manual (Page 238)

5. If the colors are still wrong, analyze the whole diagnostic sheet. Check that you find completely wrong
colors in the area corresponding to just one of the CIS modules, as in the following figure. If so, call HP
support and report “completely wrong colors after calibration”, and report the letter of the CIS module
that is failing (module A at the example).
If all the modules are failing, call HP support and report that.
Vertical distortion
If the lid sensor of the scanner fails, the scanner cannot detect when the lid is open. Hence, you can start a
scan, and at some point find that the pressure rolls do not move the original through the scanner paper path.
You may see images like the following when this happens (original on the left, scanned image on the right).
Please note the black arrow indicating the scanning direction in these examples.
Actions
1. Check that the scanner lid sensor is working by opening the scanner lid and checking that the five CIS
modules show blinking red, green and blue lights alternately. If not, call HP support and report “scanner
lid sensor failure”.
2. If all the modules lit up correctly in the previous step, close the scanner lid by pushing it down until you
hear a click. Then repeat your scan and visually check that the original advances correctly through the
scanner path. If not, call HP support and report an “incorrect paper advance” error. Remember that your
scanner is not intended to work with originals thicker than 0.75 mm (29 mil).
Object replication (ghosting)
This error very rarely appears in CIS scanners. However, you can occasionally find image defects like the
following: original on the left, scanned image on the right.
228 Chapter 22 Troubleshooting scan-quality issues ENWW