Cleaning Scanner Glass (Inside) hp3970

[JackShephard]

The duct tape helps but is not 100%.
That's why I suggested also turning the scanner upside down and then
cracking the glass enough such that it can be pulled away.

I did a very brief search for replacement glass.
http://www.anchoroptics.com/catalog/product.cfm?id=273

Great prices. I was impressed, and thought the numbers would be much
higher.

If you don't like the duct tape idea then how about this EVEN crazier
idea!!

Take a circular saw and cut off the entire top of the scanner.
Clean the glass and then glue the top back on.....

You're nuts. You should have, at the very least, said "dremel tool".

 

[D from BC]

Great prices. I was impressed, and thought the numbers would be much
higher.

You're nuts. You should have, at the very least, said "dremel tool".

Oh! oh! ..I gotta add an improvement..
A table saw!!!
Yeah...
The blade can be adjusted just enough to through the plastic..
The fence will make nice parallel cuts.
Just treat the whole scanner like a log at the saw mill..
Keep rotating the scanner until all sides are cut.
Clean the glass..
Then find a rubber molding to join the top back on.

A dremel will wander all over and make crooked/melted cuts..
D from BC

 

[JackShephard]

Oh! oh! ..I gotta add an improvement..
A table saw!!!
Yeah...
The blade can be adjusted just enough to through the plastic..
The fence will make nice parallel cuts.
Just treat the whole scanner like a log at the saw mill..
Keep rotating the scanner until all sides are cut.
Clean the glass..
Then find a rubber molding to join the top back on.

A dremel will wander all over and make crooked/melted cuts..
D from BC

Not if you use the sawtooth bit, and a guide jig.

 

[Lionel]

[sci.electronics.repair added]

Anyone know how to dismantle and clean an hp3970?

I've developed a foggy looking coating on the _inside_ :-(

Never worked on HP scanners, but I've fixed Canons & various other
brands plenty of times, & the usual steps to dissasemble go something
like this:

* Hold lid by sides & lift until the supports pop out of the slots.

* Look for a retaining strip in the area that was covered by the hinge
of the lid.

* If present, unscrew / unclip to reveal one end of the glass lid.
CAREFULLY lift open end above case & slide out.
* Goto: CLEANING.

* Otherwise, place scanner upside down on SOFT SURFACE, grab a torch,
& look under unit for round screw slots or square/rectangular
retaining-clip slots. Remove screws or 'pop' clips with long,
flatblade screwdriver.

* If it uses clips, it's usually neccessary to apply a little tension
between the halves of the shell while 'popping' the clips/hooks to
keep them released. I use tongue-depressers or similar to keep the
halves from 'clicking' back together while I'm doing the other clips.

When the case is split, it should be easy to figure out how the cover
glass is being retained. Wearing clean gloves, remove glass
*CAREFULLY*.

CLEANING:

* Put on a pair of lint-free white cotton gloves, or a pair of clean
rubber gloves.
* Place glass on clean towel, folded several times.
* Spray Windex or similar ammonia-based glass cleaner on a clean lens
cloth or similar soft, *lint-free* cloth.
* Clean top side with damp cloth, dry with a *different* cloth.
* Flip glass, touching only the sides.
* Clean this side, as above.

* Slide glass slowly & carefully back into the case, in exactly the
reverse of the way you removed it. With some cases, it can be useful
to tie a ribbon or similar around the glass first, so you can support
it with your other hand, so it can't fall inside the case if you slip,
etc. Using your gloved finger, make sure the glass is seated solidly,
& flat, as it's not always obvious, & a bad fit will give you poorly
focussed/blurred scans.

* Without removing your gloves, reassemble the unit.

* Test. (Duh.)

 

[Lionel]

Wow, you don't care how many people see how truely stupid you are. I
know a guy that tried 'standard double strength glass' instead of the
optical grade glass. It caused so much distortion in the scanned images
that it was useless, just like you.

Replacement glass for scanners, copiers, etc must be:

1) Optical grade float glass, or you'll get distortion of various
sorts - window glass is unlikely to be flat & even enough.

2) The same thickness as the original, or the optics won't focus
correctly, plus the retaining slot/clips probably won't hold it
securely, or might bow it or crack it during installation.

3) The same (or similar) refractive index as the original, or you risk
getting any - or all - of: poor contrast, lamp flare, or 'ghost'
images, due to internal reflections in the glass.

And yes, Prongy / JackShephard is a useless idiot, but of course you
already knew that. ;^)

--
\___ Proud Cog #1 in the AUK Hate Machine
_(AUK)====:: Do *you* think that you have the Right Stuff?
/='='='='-, Apply TODAY by addressing a gratuitously cruel
(O+O+O+O+O) flame to: "Uncle Fester", C/O soc.singles & AUK.
~^^^^^^^^^~~~^~^^~'~~^'^~~~"~~'"~^~'"~~^~"~'~^'^~^~^^~^~"~^~"'~'"~^~~

 

[Homer J Simpson]

* Otherwise, place scanner upside down on SOFT SURFACE, grab a torch,

Flashlight. A propane torch is too extreme.

 

[whit3rd]

Anyone know how to dismantle and clean an hp3970? [flatbed scanner]

You'll need to clean FOUR surfaces; the glass (platen), the
calibration
strip, the lamp, and the optics.

The glass and the lamp will be OK with windex. The calibration strip
is
a black or black/white region that is used to calibrate at power-on
(maybe
a Q-tip with isoporopanol). And the optics (usually a visible mirror)
can
be tricky; either spray/drip dry or use a low-residue cleaner (Freon
TF).
It's possible to gently use a Kimwipe (lint-free wiper) without
damaging
the front-surface mirror, but try to avoid touching.

If there really is smoke residue, the whole plastic case might benefit
from a wipedown; I've found a pinch of lye in a cup of distilled water
cuts through smokestains. Don't try this on anything but glass and
plastic, and DO rinse.

 

[Jim Thompson]

[snip]

If there really is smoke residue,

[snip]

Can't be, I haven't smoked since 1993, and NEVER in this house ;-)

...Jim Thompson

 

[D from BC]

[snip]

If there really is smoke residue,

[snip]

Can't be, I haven't smoked since 1993, and NEVER in this house ;-)

...Jim Thompson

I have one more razz idea for fixing that foggy on the inside scanner
problem...
Ghee

Put the whole thing in a bath of alcohol (or some electronics safe
solvent).
Let it fill up with fluid but not all the way..some air inside the
scanner will be needed for the next step..
Step 2: Shake the scanner like a making a Martini. Hopefully the
solvent will remove the stuff from inside the glass.

Spoiler: This will most likely degrease all the mechanics and spread
lubricants everywhere..making the glass more icky..

However...here's a spin off idea
Step 1: Drill a hole into the side of the scanner near the glass
Step 2: Turn the scanner upside down
Step 3: Inject cleaning solvent so it only makes contact with the
glass
Step 4: Swish the solvent around. Do not let the solvent make contact
with anything else.
Step 5: On the final swish...Have all the fluid run to one end and
then prop the scanner so the fluid can evaporate..

Spin Off Idea 2
Drill a hole big enough to insert a magnet with a cleaning pad on it..
Use another padded magnet to drag it around.
I think a similar method is used to clean aquariums.

D from BC

 

[Michael A. Terrell]

[snip]

If there really is smoke residue,

[snip]

Can't be, I haven't smoked since 1993, and NEVER in this house ;-)

...Jim Thompson

I have one more razz idea for fixing that foggy on the inside scanner
problem...
Ghee

Put the whole thing in a bath of alcohol (or some electronics safe
solvent).
Let it fill up with fluid but not all the way..some air inside the
scanner will be needed for the next step..
Step 2: Shake the scanner like a making a Martini. Hopefully the
solvent will remove the stuff from inside the glass.

Spoiler: This will most likely degrease all the mechanics and spread
lubricants everywhere..making the glass more icky..

However...here's a spin off idea
Step 1: Drill a hole into the side of the scanner near the glass
Step 2: Turn the scanner upside down
Step 3: Inject cleaning solvent so it only makes contact with the
glass
Step 4: Swish the solvent around. Do not let the solvent make contact
with anything else.
Step 5: On the final swish...Have all the fluid run to one end and
then prop the scanner so the fluid can evaporate..

Spin Off Idea 2
Drill a hole big enough to insert a magnet with a cleaning pad on it..
Use another padded magnet to drag it around.
I think a similar method is used to clean aquariums.

D from BC

You're still a "Not ready for prime time player".


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[JackShephard]

You're still a "Not ready for prime time player".

You're *still* a retard.

 

[Brandon D Cartwright]

You're *still* a retard.

He is no such thing and is worth a thousand times more than an
potty mouthed mentally diseased psycho such as yourself.

 

[Homer J Simpson]

Can't be, I haven't smoked since 1993, and NEVER in this house ;-)

IME some scanners outgas internally for whatever reason.


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[Michael Kennedy]

Flashlight. A propane torch is too extreme.

That was what first came to my mind as well. I thought he was going to melt
the clips apart.