Reattaching Scanner cover on Samsung M2675FN laser printer

[Izamrud]

Hello,

I would like some advice on reattaching the scanner cover of a Samsung M2675FN laser printer. The two uploaded photos show (1) an external shot of the scanner cover/lid (2) a shot of the detached fixing which secures the lid to the main body of the printer. There are two of these fixings, both became detached at the same time. Many thanks in advance!View of detached fixingExternal view of Lid

[BeemerBiker · Accepted solution]

Unless I'm mistaken I believe you have to replace it as  parts of it seem missing from your photos

https://www.ebay.com/itm/275035909727

Go to the below site and enter your serial number
https://partsurfer.hp.com

Look for the part you need 

For more information read this article on how to find parts.

Let me know if this was helpful

[Repairatrooper]

@BeemerBiker is correct in my opinion. Scanner hinges have powerful springs in them to keep the lid open and over time the plastic just breaks off.

[Izamrud]

Thank you Beemerbiker & Repairatrooper for your helpful replies.

I initially also thought that the hinges were broken. But if they were, then the same coloured plastic would be attached to both parts of the hinge, on either side of the break. However, if you examine the photo in the original post, as well as those attached to this current post you will

 

find that one part has a white plastic part and the other is black. Neither has any rough edges to indicate a break. Instead both the white and black parts are completely smooth.

As I mentioned above, if there was a breakage then either both parts will have a bit of white (if the white plastic part broke), or of black (if the black plastic part broke). But this is not the case.

The white plastic part is attached to the cover/lid.

The black part, which is attached to the body of the printer, can be lifted out, with a magnet, as it has an attached steel spring.

The last of the images attached to this post shows this removed part.

If you compare these images to the hinge displayed on the EBay page, you will notice that the EBay hinge is upside down compared to the ones in my photos, but they are otherwise the same.

In view of the above (particularly the absence of breaks) I suspect that there must be some way of re-assembling the hinge back to its original condition.

[Izamrud]

I finally figured out what happened - the clue was in the different coloured plastics (white & black) and in the smooth surfaces of the detached parts of the hinges.

The white and black parts of each hinge are GLUED together with cynoacrylate superglue. Over the course of years, this glue degrades and the bond weakens. The reason the black part (with the spring, as shown in the last image of my previous post) comes out of its hole - is because this piece moving up and down in its hole will allow for thicker items such as books etc to be placed into the scanner/copier and still be covered by the lid. The spring is simply to cushion the weight of the lid.

So the solution to the problem, is to remove the black 'pillars' from their holes, use supports to keep the lid open and upright, apply superglue to the white and black parts (which are the removable 'pillars') of the hinges, and press them together for a few seconds to bond them. We are then back to where we were before the detachment.

Very shoddy hinge design, but it serves its purpose and satisfies the low cost requirement of the manufacturer.

[Repairatrooper]

No nothing is glued together. If you look closely at the top of the post and the part screwed into the lid you will see that there is fractures where those parts were molded as one piece. Below is your picture with the area circled I am talking about and a picture of a similar hinge that is intact. With the pressure of the spring, I highly doubt that superglue, especially on the small surface area you have to glue is going to work. 

[Izamrud]

Hello Beamer & Repaira,

First of all, many thanks to both of you for your helpful & exhaustive replies, complete with links for the replacement parts!

This was a very interesting and a completely unfamiliar problem for me. But I have at last managed to make some progress in solving it. The parts removed and laid outGlue OptionsStuck to magnetSupergluedClose FitClean SurfacesEpoxied Hinges

The following account of my progress refers to the uploaded photos above.

Image "Stuck to magnet" (third photo), shows one of the hinge inserts which I referred to and included in the last photo of my previous post. As its attached spring is magnetic, using a strong magnet is a good way to pull it out of its recess.

Image "Glue Options" (second photo), show both the superglue originally used by Samsung as well as Araldite Metal Epoxy cement. You can also see the 50x3mm stainless steel flatbars which I used to support the cover/lid whilst pottering around with the hinges. The flatbars work very well as supports. Note particularly that 'plastic' is conspicious by its absence is the various gluable materials listed on the Superglue packaging - superglue provides only a weak bond if used between plastic surfaces.

Image "Parts removed and laid out" (first photo)  shows the two main parts of each hinge, the black part which is screwed onto the lid and the black plastic inserts with attached springs.

Image "Clean Surfaces" (sixth photo), is a closeup of the white part of the screwable hinge potion and the top of the black plastic inserts. Note how clean, smooth and unbroken they look. The white plastic part is stuck onto the top of the black plastic insert to complete the hinge.

Image "Close Fit" (fifth photo), show how closely the above mentioned white and black parts fit together. I then applied superglue to the surfaces which fit together, see the next image.

Image "Superglued" (fourth photo), is a photo of the superglued parts. Notice how well they fit together. I put these hinges back in the copier/scanner and lifted the lid once more. The hinges separated along the glued joints with the same loud snap which I heard when the cover first became detached.

Image "Epoxied together" (seventh photo), shows the same parts stuck together but now with the epoxy cement. This gives a very strong bond, much stronger  than superglue. The hinges are shown at their maximum open and closed angles, one of each. The angular difference is around 70 degrees. Open the scanner cover beyond this angle and the superglued bonds are 'designed to fail', producing the loud telltail snap of superglue bond failure .

What a poorly engineered shoddy design! There is no warning label on the scanner to warn of this opening angle  limitation.

The epoxied bond should resist debonding much more strongly than the poorly conceived superglue. But now that I am aware of the lid opening angle limitation, I will print out a warning label and stick it inside the scanner to remind myself if I ever forget.

[Izamrud]

Problem Solved!

As you can see from the above photo, with the newly epoxied hinges put back in their slots, the lid is now once again serviceable.

I have added printing off a Lid Opening Angle Warning label, to my "To Do" list. In fact, I'll print off two of 'em, one for the inside and one for the outside.

Thanks again Repaira & Beamer!

[Izamrud]

After all that palaver, messing with glues etc, I discovered that both Beemer & Repaira were RIGHT all along!

Here's the link to the replacement hinge:

https://www.aliexpress.com/item/1005005667007291.html

A very cheap and easy to install part indeed. I ordered a couple of spares, given how shoddy and breakable the hinge design is. I have also upvoted both Beemer & Repaira for their advice. My apologies gentlemen for doubting you.