How to clean glass platen inside scanner

Canon / Fr636u
December 12, 2009 at 09:35:45
Specs: Windows XP
I can't find a way to open the scanner canoscan FB636U to clean inside the glass, any "how to" ?

I have looked around for 2 days in google but found amost nothing to resolve this question

Many thanks

See More: How to clean glass platen inside scanner

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December 12, 2009 at 11:51:02
I found this about CanoScan FB630U which is quite the same model :

It says :
Re: Hardware details for Canon FB630U

"After running out of options for trying to understand the interface,
> > I decided to pull my scanner to pieces earlier this evening. Canon had
> > done a good job with one-piece moulded plastic and unnecessary amounts
> > of glue, but I got the glass off and removed the PCB cover without
> > breaking anything."
> Do you have any advice on how to remove the glass... non-destructively? My
> glass could do with a bit of cleaning inside.
> Were you able to put the scanner back together again? :^)

Apologies for the late reply - I've moved house and started a new job!

It took a certain amount of cunning to get the scanner apart in such a way
that I didn't cause any permanent damage. I'll tell you what I remember.

There are two plastic strips at each edge of the scanner. One end of each
of these is engaged in a hold to secure it, and the other end is held in a
slightly less secured slot. Essentially, you want to carefully peel up the
middle of each strip (they're glued, but not too strongly) until you can
pull out one end (should be the end nearest the front of the scanner).
When all the glue has been lifted, pivot each strip vertically through 90
degrees about the other slot and it should come out.

Once the strips are removed, the glass will come out fairly easily, but be
careful not to damage the scan head whilst sliding the glass back and

When re-assembling, the glue marks should help you get the glass in the
right place - it has a calibration thing at the scan head end.

- --
Simon Heywood
Hope this Helps

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December 12, 2009 at 17:10:38
I am puzzled as to why you find it necessary to clean the inside of the glass unless the scanner has been pulled apart previously and not put back together again properly.

It is a sealed unit and there should be no need to clean the inside of the glass as there is nothing in there that can contaminate it.


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December 12, 2009 at 19:42:11
Hi Stuarts ,

Example of an helpful answer related to the problem exposed :

"why you find it necessary to clean the inside of the glass" :
Because the glass's inside side is awfully dirty.

Even a sealed waterproof 250 meters diving watch get dirty inside, as the scanner is full of holes everywhere ... it gets dirty inside after a while.

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Related Solutions

December 13, 2009 at 05:31:12
Well having spent come considerable time underwater wearing as diving watch and uses many different scanners I have never found th need to clean the inside of either. Indeed if the inside of a diving watch got dirty I would be getting worried. If dirt can get in, so can water.

You will be wanting to dismantle a hard disk need to clean the inside to that next.


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December 13, 2009 at 08:53:13

I don't know how the underside of the scanner glass gets dirty but I have the same situation. I guarantee the unit has never been opened.

I am guessing the cause is heat from the intense light either is causing out gassing from the materials or the expansion of the air inside is reversed when the unit is off. This would cause indoor air and any pollutants in the air to be drawn in.

I haven't seen the need to clean mine because the scans appear to be OK.


Have you looked at the underside of the scanner for screws? They may be concealed by stickers, bumpers or plugs.

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December 13, 2009 at 09:07:29

I just looked at an old Canon Canoscan D646U.

No apparent means to disassemble.

However, there is a seam near the top of the base that goes most of the way around the unit. I used a pocket knife to separate the two halves partially. I didn't go any further than that but it looks like it just snaps together. I could see at least one set of interlocks that were exposed.

The lid hinges will separate if you gently insert a flat blade screw driver below the movable portion and pry upward.

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December 15, 2009 at 07:43:25
Hi everyone, I followed the instructions given in the 2nd post about CanoScan FB630U and it worked.
On this unit CanoScan FB636U there is no screw to open the scan, 2 plastic strips at each edge of the scanner are strongly glued. I carefully slided a cutter in between the glass and the sritps.

About the inside of the glass being dirty : I saw a lot of scanners and all in one having this problem.
I can say that, until now, none of the manufacturers booklets I read gives an ounce of explanation about how to clean it ...

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February 5, 2010 at 01:21:49
Not the best solution, but something: you can pull out front panel with buttons. Then using long ruler with wipe on it get inside and clean under the glass.
Try not to lose wipe inside :)

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