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 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. The treatment should not affect the scan quality or output of the 8600F.
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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.
1. Unplug the power cord. 2. Clean the outer case with a cloth dampened with a mild detergent and water. 3. If the document table glass gets dirty, clean it with a soft dry cloth. If the glass is stained with grease or some other hard-to-remove material, use a small amount of glass cleaner and a soft cloth to remove it. Wipe off all remaining liquid. 4. Ensure that there is no dust on the glass of the document table. Dust can cause white spots in your scanned images.
*** CAUTION: Do not press on the document table glass too hard.
5. Be careful not to scratch or damage the document table glass, and do not use a hard or abrasive brush to clean it. A damaged glass surface can decrease the scanning quality. 6. Never use alcohol, paint thinner or corrosive solvent to clean the scanner. These chemicals can damage the scanner components as well as the case. 7. Be careful not to spill liquid into the scanner mechanism or electronic components. This could permanently damage the mechanism and circuitry. 8. Do not spray lubricants inside the scanner. 9. Never open the scanner case.
***NOTE: Wipe the inside of the document cover and the scanner's document table before scanning transparencies.
This is acutally easier than it looks. I just had the same problem with a cloudy film starting to form underneath the glass on my older HP 4400C scanner.
First completely remove the hinged top lid by lifting straight up on both long ends of the lid - notice the 2 hinges on the back end of the lid will come straight up and out of the body of the scanner, still attached to the lid.
Next look down inside the 2 hinge holes (on the main body of the scanner where the lid hinges just came out of) and you will see a screw in each hole. Remove both screws using a phillips screwdriver. This will allow the rear end of the scanner to come apart enough so you can now lift it up a few inches to separate it and get your hand inside there to clean the underside of the glass with a soft cloth - BUT JUST REMEMBER THE FRONT END OF THE SCANNER WILL STILL BE CONNECTED, so don't pull it too far apart because it could snap and break something that is still holding the front end together. (I could not figure out how to separate the front end piece, and then I realized I didn't have to).
So on the rear end of the scanner, now carefully pull the light upper colored plastic apart from the lower dark plastic just enough so you can get your hand inside the compartment and use a soft cloth to clean the underside of the glass. I just used a small piece of an old cotton t-shirt with a couple little dabs of water on it and then just kept rubbing the dirty areas on the underside of the glass over and over until all the dust film/streaks disappeared and the glass was once again clean and all clear.
Then gently lower the glass back down and line up the plastic pieces together on the rear end and put the 2 screws back in the hinge holes, and then reinsert the hinges in their slots and lower the lid back on top of the scanner glass and it is ready to go again !!
note where the dirt is located,unplug all wires from back, remove top hinged cover, undo 2 screws at the top, remove cover plate by gently tipping toward top, slide glass with plastic sides up and out, clean with approved cleaner, reverse to reinstall glass (plug in power cord prior to replacing top cover plate to check for any missed fingerprints or dirt on underside of glass), once your happy with cleaning complete the reassembally.
To open the Canoscan 8600 to clean the inside of the glass: Gently pry off the silver "c-shaped" trim piece on the front of the scanner. Slide the silver trim pieces on each side of the scanner forward and remove them. Gently pry off the remaining black trim piece on the front of the unit. This exposes 3 phillips head screws at the front of the scanner. Remove them.Pull straight up on the rear lid of scanner (where the 2 hinges are) to remove the top. This exposes 2 screws at the bottoms of the wells that secure the hinges. Remove them.Now the top is held by only 2 clips - 1 on each side.Pull up gently on the left side of the panel, front and back, and slide the panel back towards the rear. That should free the clip.Repeat for the right side.Take it easy, and you won't break anything.
Found this question on-line as I also wanted to know the answer. Couldnt find an answer so I just decided to have a go myself. It was quite easy really.
Lift the lid upwards and gently push it backwards from the hinged end and it will unclip.
With the scanner facing away from you, undo the only 2 screws visible at the back. Then gently lift up and push forward towards the front. You can see thru the glass 3 plasic lugs holding the front down. With a little wiggle the cover with the glass attached will come away from the slotted holes where the plastic lugs go. Clean glass an carefully replace lid in the reverse order.
1st step. Remove the lid. It just pulls out at the hinge end by lifting straight up, horizontal if you like. Where the two lid posts insert in the scanner body you will find 2 screws, undo them, no need to remove at this point, too hard. Rememeber you left them in there though.
2nd step. Around the 4 buttons at the control end is a striped trim panel that is the full width of the scanner. Locate the join between this trim and the light grey underside of the scanner body and just left and right of the COPY & EMAIL buttons, Using your fingernails lift with some gentle force. This edge will pop up. Note, the trim panel has 3 location tabs that insert under the grey border edge around the glass. So pop the front edge first and pull towards yourself.
3rd step. Once this trim is removed you will note 4 little grey plugs equally spaced under this area. remove the plugs and you will find 4 screws. Unscrew them, no need to remove, remember point above.
4th step. Time for CAUTION. You will be able to lift the upper part of the scanner up in which the glass is mounted. ***There is a lead with little play connected to the 4 buttons PCB which is attached to the upper panel. To ensure you don't damage it accidently when cleaning the glass you can remove the 2 screws attaching it to the upper panel.
5th step. See if you can wipe it, with a VERY SOFT LINT FREE cloth, without putting you finger on it somewhere......................
6th step. reassembly is the same in reverse
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.
Have you tried these possible solutions;
1.Clean the surface of scanner bed.
2.Uninstalled/reinstall scanner driver/software.
3.Check scanner manufacture web site for driver/firmware updates.
4.checked the underside of the scanner glass for lint, dust that may cause a bad calibration.