Canon scanner (CanoScan 8000-F)

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 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

"Bob Williams" wrote in message

> You might try putting the scanner in a cardboard box with a pound of
> Silica Gel. Seal the box and let it stay for a day or two.
>
> You can buy Silica gel at the pet shop as Cat Litter.
> It is marketed as Litter Pearls, ExquisiCat Crystals, and TidyCat
> Crystals. Scatter the silica gel on the bottom of the box to increase the
> surface area for adsorption.
> Bob Williams

Thanks Bob, believe it or not, I never thought of that and it's the most
obvious solution!

Thanks! Just after I sent this post I realised it was, really, to the wrong
group - but it appears I was wrong.

Thanks again Bob, thanks very much - I shall certainly try that!

Regards,

John
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

On Apr 5, 1:38 pm, "John Vanini" wrote:
> I have a Canon scanner (CanoScan 8000-F) and, some time ago, marks looking
> exactly like moisture trails (I'm sure that's what they are) appeared all
> over the inside of the glass.
>
> I can't find a way of removing the glass, so that I can wipe the underside
> clean, without risking breaking the plastic casing.
>
> It was just outside the warranty period (isn't it always!) and Canon wanted
> to charge me almost the same price as the cost of a new one.
>
> This 'misting' affects everything I scan in but is worse for photographs
> where they produce dull, flat areas, which I can't find a way of removing.
>
> Does anyone know of how I might get inside the scanner to clean the glass,
> please?
>
> Regards
>
> John

Sorry to differ from the other replies, but my bet is that it is
either 'out-gassing' from the plastics or lubricants used in the
scanner (or perhaps something in your own environment, or possibly
even a bug of some kind. I've had a similar problem that turned out
to be a small caterpillar leaving trails across the glass, presumably
from a household moth..

By all means try the other method, but I think you will need to get
the scanner apart. Look carefully for screw covers, or they may be
under labels, then look for small slots along the joins, and gently
flex the case looking for areas that might hide hidden clips that
might be sprung via a flat bladed knife or similar. Also check
carefully around the glass itself - that may be the way in... If you
have a computer/camera fixit place nearby, why not just go ask them?
Those folks generally know the sort of assembly tricks used and may be
able to do the task quite cheaply.
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

wrote in message

>
> But doesn't this assume it's simple moisture and not a more viscous
> lubricant which might be a more reasonable assumption? I cant see how
> moisture would cause this in conditioned living space. Of course I could
> be
> wrong.


Also, using the scanner, repeatedly, should dry it, if it's water vapour,
given the heat of the lamp.
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

Thanks everybody,

I'll look into all the suggestions but it's obviously easier to try the
silica gel route first.

I did put the scanner in a warm, dry cupboard for a day and that made no
difference so moisture didn't seem likely, however,I couldn't see what else
it could be.

I've tried to open the case but can't see anyway of doing so. There are no
signs of screws or even labels under which screws might be hidden, as you
suggest Mark, but I'll have another good root around to check.

I rang Canon, at least a couple of times, with exactly that in mind - to ask
them how to get into the case but they either couldn't or wouldn't tell me.
I was hoping that they might be able to tell me what the 'trails' might be
but, again, either couldn't or wouldn't.

They said I might damage the interior electronic card (or words to that
effect) and it was best to return the whole unit for servicing, but, to do
so, would have cost me almost as much as a new scanner - and I would have
had to pay carriage charge and insurance both ways.

Anyway, thanks again for all your help and advice. All check into all of
them.

Regards,

John
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

In article ,
"John Vanini" wrote:

> I have a Canon scanner (CanoScan 8000-F) and, some time ago, marks looking
> exactly like moisture trails (I'm sure that's what they are) appeared all
> over the inside of the glass.
>
> I can't find a way of removing the glass, so that I can wipe the underside
> clean, without risking breaking the plastic casing.
>
> It was just outside the warranty period (isn't it always!) and Canon wanted
> to charge me almost the same price as the cost of a new one.
>
> This 'misting' affects everything I scan in but is worse for photographs
> where they produce dull, flat areas, which I can't find a way of removing.
>
> Does anyone know of how I might get inside the scanner to clean the glass,
> please?
>
> Regards
>
> John

You could try turning it upside down and flushing a lot of distilled
water though it. Just don't wet the optics or, even worse, a greased
part. Once the glass is very clean you should be able to gently roll a
large bead of water across the glass so that no drops are left behind.
Use this trick as a final wash even if you do get the case open. A
paper towel's dust and residue will make a total mess of the optics.

A lot of small electronics has screws hidden under the label or under
the rubber feet. You can poke them with a needle to see if there's a
hollow space behind them.

--
Block Google's spam and enjoy Usenet again.
Reply with Google and I won't hear from you.
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

John Vanini wrote:
> I have a Canon scanner (CanoScan 8000-F) and, some time ago, marks looking
> exactly like moisture trails (I'm sure that's what they are) appeared all
> over the inside of the glass.
>
> I can't find a way of removing the glass, so that I can wipe the underside
> clean, without risking breaking the plastic casing.
>
> It was just outside the warranty period (isn't it always!) and Canon wanted
> to charge me almost the same price as the cost of a new one.
>
> This 'misting' affects everything I scan in but is worse for photographs
> where they produce dull, flat areas, which I can't find a way of removing.
>
> Does anyone know of how I might get inside the scanner to clean the glass,
> please?
>
> Regards
>
> John
>
>
I haven't read every post to this thread, so this might already have
been suggested. I would set a hair drier to its lowest temperature and
blow on the surface of the glass just long enough to raise its
temperature a few degrees. If it is indeed humidity condensation it
should disappear. If that works, perhaps you could invest in the
lowest-price hair drier you can find, leave it by the scanner, and use
it just before you scan each time. Incidentally, I have a 8400F, which I
suspect is the same case design, and I can see no easy way (other than
the "bigger hammer" approach) to get into it. I haven't had your
problem, I'm happy to say, and I live in Austin TX, which is neither
excessively humid nor excessively dry most of the time. May I ask where
you live?
Allen
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

<snip>

This problem is very common, particularly with Epson scanners. I've had new
scanners from Epson delivered like this. The problem is condensation forming
under the glass. It won't disappear over time, it will get worse. It is made
worse if the scanner is left in a moist atmosphere The effect is the same as
on a bathroom window. If you leave a windowpane uncleaned in a bathroom it
will start to look exactly the same as your scanner over a period of time.
It's the tiny particles of dust/dirt/grease etc that stick the surface when
the steam is formed and condenses on the glass. It's the same with a
scanner; particles are left on the glass. It is very difficult to remove
without taking the scanner apart and cleaning the glass. I doubt that using
silica gel will remove it. But please do let us know it works.

Every Epson scanner I've owned has developed this problem over time. Someone
once suggested that with Epson its the plasticizers in the plastic that gass
off. This may explain why Epsons seem to be particulary affected
..Fortunately, someone posted disassembly instructions for Epson scanners on
one of the scanner newsgroups a few years ago. I suggest you actually post
to one of the scanner groups in case someone knows how to take a Canon
apart.

pdm
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

<snip>

This problem is very common, particularly with Epson scanners. I've had new
scanners from Epson delivered like this. The problem is condensation forming
under the glass. It won't disappear over time, it will get worse. It is made
worse if the scanner is left in a moist atmosphere The effect is the same as
on a bathroom window. If you leave a windowpane uncleaned in a bathroom it
will start to look exactly the same as your scanner over a period of time.
It's the tiny particles of dust/dirt/grease etc that stick the surface when
the steam is formed and condenses on the glass. It's the same with a
scanner; particles are left on the glass. It is very difficult to remove
without taking the scanner apart and cleaning the glass. I doubt that using
silica gel will remove it. But please do let us know it works.

Every Epson scanner I've owned has developed this problem over time. Someone
once suggested that with Epson its the plasticizers in the plastic that gass
off. This may explain why Epsons seem to be particulary affected
..Fortunately, someone posted disassembly instructions for Epson scanners on
one of the scanner newsgroups a few years ago. I suggest you actually post
to one of the scanner groups in case someone knows how to take a Canon
apart.

pdm
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

"Paul D Moore" wrote in message

> <snip>
>
> This problem is very common, particularly with Epson scanners. I've had
> new scanners from Epson delivered like this. The problem is condensation
> forming under the glass. It won't disappear over time, it will get worse.
> It is made worse if the scanner is left in a moist atmosphere The effect
> is the same as on a bathroom window. If you leave a windowpane uncleaned
> in a bathroom it will start to look exactly the same as your scanner over
> a period of time. It's the tiny particles of dust/dirt/grease etc that
> stick the surface when the steam is formed and condenses on the glass.
> It's the same with a scanner; particles are left on the glass. It is very
> difficult to remove without taking the scanner apart and cleaning the
> glass. I doubt that using silica gel will remove it. But please do let us
> know it works.
>
> Every Epson scanner I've owned has developed this problem over time.
> Someone once suggested that with Epson its the plasticizers in the plastic
> that gass off. This may explain why Epsons seem to be particulary affected
> .Fortunately, someone posted disassembly instructions for Epson scanners
> on one of the scanner newsgroups a few years ago. I suggest you actually
> post to one of the scanner groups in case someone knows how to take a
> Canon apart.
>
> pdm

> Thanks Paul, I understand what you're saying and will see what I can find
> out about disassembling this one. When I rang Epson, I asked if someone in
> their service department could tell me how to get the glass out without
> breaking anything, but they only wanted to discuss sending it back for
> repair.

Strangely enough, I posted to this group by accident so then posted the same
question to a scanner newsgroup but got only one reply from them!

I'll have a look to see what other scanner groups there are but I've had a
lot of good ideas and suggestions from this group (for which I again, thank
everyone) so am pleased I made the error in the first place.

Regards

John
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

"Kevin McMurtrie" wrote in message

> In article ,
> "John Vanini" wrote:
>
>> I have a Canon scanner (CanoScan 8000-F) and, some time ago, marks
>> looking
>> exactly like moisture trails (I'm sure that's what they are) appeared all
>> over the inside of the glass.
>>
>> I can't find a way of removing the glass, so that I can wipe the
>> underside
>> clean, without risking breaking the plastic casing.
>>
>> It was just outside the warranty period (isn't it always!) and Canon
>> wanted
>> to charge me almost the same price as the cost of a new one.
>>
>> This 'misting' affects everything I scan in but is worse for photographs
>> where they produce dull, flat areas, which I can't find a way of
>> removing.
>>
>> Does anyone know of how I might get inside the scanner to clean the
>> glass,
>> please?
>>
>> Regards
>>
>> John
>
> You could try turning it upside down and flushing a lot of distilled
> water though it. Just don't wet the optics or, even worse, a greased
> part. Once the glass is very clean you should be able to gently roll a
> large bead of water across the glass so that no drops are left behind.
> Use this trick as a final wash even if you do get the case open. A
> paper towel's dust and residue will make a total mess of the optics.
>
> A lot of small electronics has screws hidden under the label or under
> the rubber feet. You can poke them with a needle to see if there's a
> hollow space behind them.
>
> --
> Block Google's spam and enjoy Usenet again.
> Reply with Google and I won't hear from you.

When I first tried to take it apart (and looking at it now) I couldn't see
any labels, rubber feet, or anything under which screws could be fitted -
but Epson had to assemble it somehow, in the first place, and their repair
team must be able to get in without breaking anything!

I've removed whatever, I can see is removable but there appears to be no way
in.

Trying to wash it out with water is a little bit frightening as there is
only a small, thin gap down one side of the plastic moulding and it would be
so easy to get water in the wrong place but thanks for your suggestion and
the information.

John
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

I'm sorry! So, sorry! So, very, very, sorry! I meant to say Canon not Epson!

I've also got a problem with an Epson printer and have been discussing this
all morning with the result that I typed the wrong makers name.

Sackcloth and ashes! Woe and thrice woe, I am undone!

John
 >> Stay informed about: Canon scanner (CanoScan 8000-F) 

Lift off the top cover--it has two posts that go into holes in the scanner
body, and you will find the screws that hold the top plate on. Remove them
and IIRC it is a simple matter to lift off the glass for cleaning.

Toby

"John Vanini" wrote in message

>I have a Canon scanner (CanoScan 8000-F) and, some time ago, marks looking
>exactly like moisture trails (I'm sure that's what they are) appeared all
>over the inside of the glass.
>
> I can't find a way of removing the glass, so that I can wipe the underside
> clean, without risking breaking the plastic casing.
>
> It was just outside the warranty period (isn't it always!) and Canon
> wanted to charge me almost the same price as the cost of a new one.
>
> This 'misting' affects everything I scan in but is worse for photographs
> where they produce dull, flat areas, which I can't find a way of removing.
>
> Does anyone know of how I might get inside the scanner to clean the glass,
> please?
>
> Regards
>
> John
>
>
 >> Stay informed about: Canon scanner (CanoScan 8000-F)