Question about HP Scanjet 7400c Flatbed Scanner

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Hp 7400c haze on INSIDE of scanner glass

I would like to know if it is possible to clean the inside of the scanner glass--it is causing a bluish haze on scans

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I figured this one out.

There is a language panel on the front (that tells you what each button does). The original instructions mentioned putting the panel on but not taking it off. If you use a small, thin screwdriver or thin, dull knife from underneath, you can work your way across the bottom edge, popping off the language panel. When you remove the panel you reveal three screws, one rather tiny one in the center toward the bottom, and two medium sized ones to the sides closer to the top. Slide the glass cover up and off. There are two more medium sized screws near the slots for the cover. Remove all five screws. The assembly with the glass comes right off, allowing you to clean both sides.

Posted on Aug 11, 2009

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The scanner glass inside is cloudy


I recommend you do not take off the glass. I have done it and was never able to get rid of the dust, which really shows up on every scan. The fogging has something to do with an optical coating on the underside of the glass. If I knew then what I know now, I would let it be. If the fogging doesn't show up in scans, leave it. If it really does show up, the glass itself is often held down by simple double stick tape. You try to keep the tape intact so you can put it back down. It may be strong enough that the plastic frame on top of it could snap. Do it in as clean (not dusty) environment as possible so dust does not drift down inside the scanner. Never touch the lamp or move the scan mechanism. Again, don't do it unless it's showing up on scan results. Sadly, nobody "fixes" scanners, they are disposable, like coffee pots, even if they cost 300.00.

Mar 12, 2014 | Epson Perfection 1650 Photo Flatbed...

Tip

Cleaning your inside scanner glass


Actually it's a very simple procedure!

Read this entire comment first...then start your procedures!

Disconnect the power cord, disconnect the USB cable, remove the top cover cable from the base by unscrewing the two plastic knobs, lift the top cover straight up. Place the top cover in a safe place.

On a clean, flat surface, turn the base upside down. On both ends you will find a total of four (4) black phillips head screws. Carefully unscrew these four screws and place aside. Carefully lift up the base and the top glass will separate from the base. Set the base aside. You have now exposed the inside glass for cleaning! It's that simple!!! Clean the glass by using a streak-free glass cleaner. Don't spray the glass, rather, lightly spray a clean soft lint free glass cleaning cloth, then wipe the glass. Don't press hard! Use good common sense1 There, you've now cleaned the interior glass. Reverse the procedure and you are finished. Wasn't that simple??

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there is no consumer serviceable parts inside, these are "disposable" scanners and never intended to be repaired or serviced inside.

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Hello,
For sure there are drivers for HP 7400c Scanner.
Kindly look the link below and when you reach the page please select your configuration and you are done.
After installing the driver, kindly re-start the system .
http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?prodNameId=28407&lang=en&cc=us&taskId=135&prodTypeId=15179&prodSeriesId=28404
I hope it helps.
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WE HAVE 8 CANON DR-2050C SCANNERS IN OUR X-RAY DEPARTMENT, ALL OF WHICH HAVE STUBBORN ARTIFACT LINES IN VARIOUS PLACES.... WE TRIED CLEANING THE GLASS SURFACES WITH ALCOHOL WIPES, BUT STILL HAVE THOSE...


It might be that you have dust on the inside of the glass that is causing the problem. It might be possible to replace the scanning elements. You might try some compressed air to see if you can get enough pressure below the glass to dislodge whatever is causing the problem.

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Got this from Canon.com: The foggy haze on the glass is actually an anti-glare treatment that has been intentionally applied to the underside of the scanner glass. This treatment lessens the glare from the lamp under the glass and provides better image quality. This haze may not appear uniform because of the shape of the scanner base and the components under the glass. However, the anti-glare treatment has been uniformly applied and the haze is as expected.

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I made contact with cannon and received this reply. I was satisfied with the answer but the question still remained on how to remove the glass should i wish to do so. Also after there answer... would there then be a problem if i did clean the reverse side. Their answer was initialy this...
The foggy haze on the glass is actually an anti-glare treatment that has
been intentionally applied to the underside of the scanner glass.  This 
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1 Answer

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