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The only things I can think of besides a mechanical failure is that
somehow your brightness and contrast settings got messed up or your
scan area has been reduced to a black area of the picture. What size
are the resulting files that come out all black?
Most common cause for a band on copies or sent faxes is debris on the scanner glass. A cotton swab dipped in rubbing alcohol will usually work in cleaning the scan area. After cleaning the area, allow it to completely dry prior to testing the machine.
whee you feed the paper into the machine... their should be a rectangular **** glass... this glass is located in the area that you place your document for scanning... that area usually opens up easily... once open you should see it either at the bottom or on the top cover... thats called a ccd and its broken... it needs to be replaced... contact hp support tell them your machine number and ask them for a price on the part and a part number... then look around online for the same part and get a cheaper price...
It sounds like you have a spot on your image scanner. Open the top of the scanner as you would to place a sheet of paper on the flat surface. You should see a thin strip of glass separate from the main glass. This area is where the page feeder scans pages. Use a paper towel dampened with window cleaner to gently scrub this area and I would bet you will find either dried ink and a clump of dirty on the unit. Let it dry out for just a minute and then try scanning. You should be back with clear images.
I had the same problem and just found the solution.
Solution one: Make sure that the Digital Imaging Monitor is ready
The Digital Imaging Monitor must be running in order for the Scan To function to work. If it is running, the DIM icon ( ) is present in the notification area. The notification area is located in the lower-right corner of the computer by the clock.
Figure 1: Notification area
If the DIM icon is in the system tray, you do not need to complete this procedure. Skip to the next solution.
Follow these steps to set the computer to run the DIM.
On the Windows taskbar, click the Windows icon ( ).
In the Start Search text box, type msconfig , and then press Enter .
On the User Account Control window, click Continue . The System Configuration Utility window appears.
Click the Startup tab.
Select the HP Digital Imaging Monitor check box.
If HP Digital Imaging Monitor is not on the list, the driver was not correctly installed or a custom install was used. Reinstall the software to resolve this issue.
If you lift the scanner cover, you should see an area on the right end of the platen glass marked at the edge with arrows as Read Area. This is the area used when documents are scanned through the auto feed. Make sure that the glass is completely clean in this area, as any dirt will show up as a line on the copied image.
Your scanner’s lock switch may be locking up the carriage unit. Depending on the model you own, your scanner’s lock switch resides in one of two locations. You can find it beneath the scanner itself or in a corner next to the scanner bed after you lift the lid. The switch should be marked with a locked and unlocked padlock symbol; slide the switch to the unlocked padlock to unlock the carriage unit.
It’s also possible that the supplied USB cable is improperly connected to your computer. Connect the cable directly to your PC. Canon’s online documentation indicates that scanners that connect via a USB hub may not work properly. Once you have unlocked your scanner and properly connected it directly to your computer, try to rescan the image.
If you set Automatic brightness/Contrast this happens. Try manual setting. Adjust different settings and select the best suited for a particular type of drawing. The scanner takes couple of milliseconds to judge the best lighting, by then the paper has moved little. This area appears black. This is easily solvable.
Even a single grain of dust or a single strand of hair on the scanning glass will cause the scan head to perceive ink/image where there is none. Deffinetly try cleaning the glass using a good window cleaner, and a cloth that is completely clean, or even a peice of newspaper. If the black line remains, I would suggest taking it into a service center to have the scan head itself cleaned.