Convert&Restoration project of IBM 3742 beamspring keyboard

Heikkonen

06 Oct 2019, 23:29

I just recently picked up this beamer from being recycled, sadly the other parts of the system it was built for were long gone according the contact i got it from :(
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The case itself was in pretty good shape but aluminium parts had some minor damage as seen below
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I was surprised how good of a shape it was and it was been clearly kept well considering its age. I proceeded to open it and check the condition inside to figure out what kind of restoration it needed. I saw there was spots of rust but evaporust will take care of them soon.

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Old documentation found inside:
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First look after removing barrel:
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Its time to remove the keycaps and see hows the springs, the old dirtshield(?) was crispy and overall in a horrible condition and couldnt be saved. Dont worry about that small document found on the dirtshield,it was saved ;)
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Closeup of the keycap:
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First look at the springs:
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I proceed to open the backplate to see hows the pcb and rubber mat doing after all these years. Turns out backplate has some minor dmg to it and will be dealt with evaporust,rubber mat was in pristine condition. And the PCB,what a beauty.
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PCB stored temporarily :lol:

Now when the backplate and the pcb was removed i got my first look at the modules and the infamous sticky foam(will be replaced after):
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I then removed each module and tryed to get rid of sticky foam. After many tedious hours removing the foam,double sided tape and the glue i was finally able to evaporust the barrel,it got rid of the small spots of red rust and small corrosion i founded early:


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After this i went to evaporust the backplate and spacebar that had rust spots aswell:

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Aluminium parts were cleaned but couldnt get rid of all the damage they have taken, the frontside was fully restored tho:

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Cleaned the case and the keycaps with warm water and soap:

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Modules ready to be cleaned:
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I will keep uploading more pics as more restoration takes part(upcoming foam replace and possible evaporusting the springs of the modules)

If anyone of you guys have ideas how to convert that thing into modern pc´s,im happy to take all your suggestions and have a talk about this project overall,hit me with private message or send a msg on discord Heikkonen#3771

Ps. Thanks to you who already are helping me with the converting!

- Heikkonen

kmnov2017

06 Oct 2019, 23:34

Now that's a find! Where's the rest of the table?

Heikkonen

06 Oct 2019, 23:37

The lady who i got from said that the rest of the system were recycled years and years ago,what a shame.

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SneakyRobb

07 Oct 2019, 01:40

Honestly the mechanism for the switches is like 8/10.

You will easily be able to repair this beamspring mechanically...

I am unsure about converting the pcb.

DMA

07 Oct 2019, 03:35

As your attorney, I advise you to remake the PCB, it shows signs of copper corrosion.

Heikkonen

07 Oct 2019, 21:54

Im now ordering replacement pcb and controller for it. Thanks for the tip DMA! Is there any proper way to remove the corrosion without damaging the old pcb?

SneakyRobb: I had a talk with few members of DT that were kind enough to give me exact details of what kind of pcb and controller i need to proceed.

One of the members contacted me about the foam and will be getting replacement for it.

Ill keep updating the post when the packages arrive.

Atlantic

07 Oct 2019, 23:24

Very nice find!

DMA

09 Oct 2019, 06:29

Usually weak acid is used to remove oxides - but it doesn't worth it nowadays, PCBs are very cheap.

Heikkonen

17 Oct 2019, 19:11

PCB has arrived along with controller.
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Thanks to manisteinn for providing replacement foam for this project!
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I managed to build firmware and bootloader well but when im trying to port acquire,ill get this
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I checked PSoc Programmer side and it tells me this:

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I followed forum member snackcats guide other than i didnt solder everything up until i went for firmware side as shown below(Could this cause it?)

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(Metallic pins wont touch eachother)

Any help will be appreciated! You can reply to this post,send me a dm on discord Heikkonen#3771 or send a private msg.

I will be assembling beamer back to original form with new pcb and foam soon,pics inc

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