Question about Canon CanoScan 9900F Flatbed Scanner

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Canon 9900f scanner glass removal

I have a canon 9900f scanner, works fine, but the underside of the glass is dirty. I cannot see any obvious way of removing the glass ( no screws visible). How do I get to the underside of the glass?

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I would not worry about the underside of the glass unless you are having problems. The focal length of the ccd that captures the image is very specific and probably will not pick up anything under the glass. It is normal for the underside to look foggy but it will not hurt anything.

Posted on Jul 28, 2008

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To be clear, it is quite easy to remove the glass, but you shouldn't need to even if you can see the odd bit of dust. However, if you do want to (voiding warranty etc.) here's how:

  1. unplug and remove lid
  2. use philips screwdriver, remove screws in the two recesses of the main scanner body that the lid hinges slot into
  3. gently pry the black plastic part away from the grey plastic body, starting near the glass until it tilts up and away. be careful of the clips at the back end of the scanner
  4. the glass panel and grey surround can then be lifted and slid towards the back of the scanner and pulled free.

Posted on Aug 03, 2009

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Hi jjheller

http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=BoxContentsTabAct&fcategoryid=235&modelid=8743

This site tells you only about the AC Adapter which you probably have unless you bought it secondhand.

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How on earth did the underside of the glass get dirty?

Ok, never mind that... in the end, it's NOT worth it. In the old days, you could have since scanners were as big as printers are today... but now they are definitely NOT designed for the consumer to service. The scanner is designed for accuracy, even if you were to get it all apart, the odds that you maintain the precision and integrity of the bulb, the track on which the bulb moves, etc, are very slim.

Suggestion... How is the printer you have holding up? If it's getting on in age, it may be a wise investment to purchase a dual scanner/printer (as long as you are spending the money).

Hope that helps :)

-- RT

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Cleaning Canoscan 9900F glass


To be clear, it is quite easy to remove the glass, but you shouldn't need to even if you can see the odd bit of dust. However, if you do want to (voiding warranty etc.) here's how:
  1. unplug and remove lid
  2. use philips screwdriver, remove screws in the two recesses of the main scanner body that the lid hinges slot into
  3. gently pry the black plastic part away from the grey plastic body, starting near the glass until it tilts up and away. be careful of the clips at the back end of the scanner
  4. the glass panel and grey surround can then be lifted and slid towards the back of the scanner and pulled free.

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Possible causes, CCD failure, smudges or marks that can only be picked up by the CCD if the underside of the scanner glass is dirty. Uninstalling/reinstalling your scanner driver will eliminate if its software related or not. From the looks of it, could be with the CCD if the lines are in the same area with every scan attempted.

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