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Needs little bit technical skill level to do this activity:Open adf unit, remove flat bed glass, take out CCD unit, open bonnet of CCD, clean reflcted gasses with smooth cotton cloth or ear buds(no solvents requited) fix it back, clean glass both side, fix back all, try it..best of luck..Pl see the snaps for help:
Sounds like the scanner bulb is burnt out or it's not able to move the scanner sled. It should be saying "scanner error" as well. (and I think you meant unable to scan, copy or send fax) No fix unfortunately other than getting a replacement unit (which I believe now is the 8500 premiere)
If you need a replacement, your timing is good, they are $200 off right now, and selling for $299.
Your unit as it stands still makes a good printer and will receive faxes, and you CAN send a fax as long as you do it from the computer.
1st step : Turn on your *HP Deskjet F4185*. 2nd step : Click the Start menu. 3rd step : Click Devices and printers. A new window will appear. 4th step : Then, click the "Fax button ".The window Fax and Scan window will appear. 5th step : On the lower left corner , click "Scan" below the "Fax" button.Scanned documents (if there's any) will appear. 6th step : Click "New scan" button below the "File" button. And your printer will start! Glad to help..
completely uninstall all software realated to this printer. disconnect your pc from the web. disable your anti virus and firewall then run your fresh install. if you are getting the diver/software from the web save it to your desktop and follow the first dsirections this should solve your problem
1 Scan using Windows Fax and Scan
Click the Windows icon ( ), click Programs , and then click Windows Fax and Scan .
The Windows Fax and Scan option is available in the Business, Ultimate, and Enterprise editions of Windows Vista. If you have the Home Basic or Home Premium edition of Windows Vista, skip to Option two: Scan using Paint .
Click New scan .
Click File , and then click Scan .
Option two: Scan using Paint
Click the Windows icon ( ), click Programs , and then click Accessories .
Click Paint .
Click File , and then click From Scanner or Camera .
Pressing of scan button feature is no longer supported by hp drivers, if installed correctly one scans using scanners and fax
When the scan button is pressed on the printer, nothing happens. The scan button does not work correctly.
Scan documents using Windows Fax and Scanning or Paint.
Scanning with Windows Fax and Scanning
Click the Start ( ) icon.
Click All Programs .
Click Windows Fax and Scanning .
Click New Scan .
Click File and then click Scan .
Scanning with Paint
Click Windows .
Click All Programs .
Click Accessories .
Click Paint .
Click File and then click From Scanner or Camera .
Click Scan .
The drivers in the Windows Vista operating system do not support button press functionality on the printer.
link to above info from HP