HP DesignJet T730 User guide - Page 165
Vertical black band 30 cm wide, The scanner damages some originals
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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 D, K and L 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 30 cm wide Your scanner contains various scanner scanbars, each of which covers an area 30 cm (12 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 scanbar, in your scanned image or copy. Here is an example (on the right). NOTE: The black arrow indicates the scanning direction. Original Scan affected by a failing scanbar Actions 1. 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. 2. If the problem persists, try to calibrate the scanner as indicated in Calibrate the scanner on page 111. If this operation fails, call HP support with the error code given on the front panel. If no error code appears, try to repeat your scan. 3. If the problem persists, call HP support and report a "vertical black band 30 cm wide". The scanner damages some originals This scanner may cause vertical scratches on thick glossy paper printed on by inkjet printers. Old prints or very thin tracing paper may also be damaged. This is because CIS technology requires the original to be held down with high pressure to obtain accurate results and avoid blurring and defocus problems. ENWW Vertical black band 30 cm wide 161