IBM 107 FMK - IBM 107 472X-41-53951 - Lot of pictures

[seebart]

Yesterday I got a little electric shock from the keyboard. In the morning and in the afternoon.

oh I had not thought about that at all. All that exposed metal.

[snoopy]

that's not a big problem. here's the solution:

[chzel]

I'd think it's because you have well grounded bare metal, so any static build-up will discharge through the chassis to ground!

[0100010]

No shocks from mine, static or otherwise. Did you ground the case to the USB cable braided shield (like the original cable was)?

[idollar]

I will check today the keyboard with the tester and report what is happening.
The controller is connected to the barrels board using a screw. This is contact with the case. It could be that this is not sufficient. The tester will tell us.

[chzel]

My guess is that it is plenty sufficient. If the case was not grounded correctly, you wouldn't get shocks. You get them because you get discharged through the
case to the cable, to the psu, to electrical earth.

[ramnes]

My name proposal: Hartman, as in reference to Full Metal Jacket.

[idollar]

My name proposal: Hartman, as in reference to Full Metal Jacket.

Added !

[seebart]

my name proposal:

IBM 107 FMK


FMK = Full Metal Keyboard

[LLRnR]

Not sure if you've noticed it, my name proposal is Hulk. As in full o' muscles.

[idollar]

my name proposal:

IBM 107 FMK


FMK = Full Metal Keyboard

Added

[idollar]

Not sure if you've noticed it, my name proposal is Hulk. As in full o' muscles.

[webwit]

Margaret.

[LLRnR]

Margaret.

The Wild Duck can be such a troll sometimes...

[webwit]

The iron lady!

[seebart]

The iron lady!

good one! Forget Margaret.

[Redmaus]

Buckling Steel?
(or aluminum, whatever)

[idollar]

All,

I have changed the entries on the pool for you to vote.

I am typing with the finished keyboard that I will open again to show you the pictures.

There are news, errors, patches, and recommendations to come with regards to the xwhatsit controller. I broke and repaired one of my keyboards ! I will try to post some more information today.

[idollar]

added section 17

[idollar]

... and 18

[ramnes]

My name proposal: Hartman, as in reference to Full Metal Jacket.

Added !

You added Full Metal Jacket, not Hartman.

[idollar]

I am not sure if this can be repaired without loosing the votes
Let me see.

[idollar]

My name proposal: Hartman, as in reference to Full Metal Jacket.

Added !

You added Full Metal Jacket, not Hartman.

Done ... it took the risk. It did not reset the voting

[idollar]

Added section 19 !

[idollar]

Added section 20

[Redmaus]

As far as the voting goes, will there be anything like an elimination round? To take the names that have no votes out and then have everyone vote on the highest voted names?

[LLRnR]

Very clever way of fixing the broken xwhatsit controller! How did you manage to find out which cable goes where? Was everything documented in the xwhatsit manual? Anyhow, it's really impressive what you did. Others would have simply given up and bought a new controller.

[idollar]

As far as the voting goes, will there be anything like an elimination round? To take the names that have no votes out and then have everyone vote on the highest voted names?

Good idea. I will eliminate the options that are not voted or with 1 vote after Wednesday !

[idollar]

Very clever way of fixing the broken xwhatsit controller! How did you manage to find out which cable goes where? Was everything documented in the xwhatsit manual? Anyhow, it's really impressive what you did. Others would have simply given up and bought a new controller.

You know ... never give up





Finding where to get the cables was not really complicated. I could have asked, but reverse engineering is fun:

1.- Get the usb pinout. For instance.

https://forum.sparkfun.com/viewtopic.php?f=19&t=33227

2.- Get the PCB layout

http://uploads.oshpark.com/uploads/proj ... 58GJ/i.png

3.- Get the pinout of the atmel. This will help to find out the resistors from the other side

http://www.atmel.com/images/doc7799.pdf

Figure 1-1. Pinout

The rest is a matter of testing the resistance between the pins.

[LLRnR]

Finding where to get the cables was not really complicated. I could have asked, but reverse engineering is fun:
[...]
The rest is a matter of testing the resistance between the pins.

Great detective work! I hope no one else gets in this sort of situation, but your approach shows that there is a fix to this mistake. Thanks for the insight!