Gregmidi

Relocation of keybed from main board not working

16 posts in this topic

Hi everyone, what a wonderful forum you guys have here and such smart people too. So... I have a CME UF80 and decided to (stupidly) relocate the keybed to under my desk and was hoping to have the main controller part on top of my desk (things I do when I get bored)... So i went ahead and mounted the keybed under my Desk and purchased some ribbon extension cables (130cm) from China. This is where it all went wrong. I did not realise that ribbon cables won't work if they are longer than 45cm :( So now I don't know what to do, Is it even possible to still use my keyboard this way? I haven't been able to find any alternative wire that would work either. Is there a kit available on here that would do the trick?. Sorry for the long post, hope you guys can help me. I can upload pics if you need me too also... I'm sorry If I have posted this in the wrong area too...Thanks so much :)

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Posted (edited)

Hi and welcome to the forum!

Well, to be honest I can not believe, that a ribbon cable with this length stops working completely. 

Are you sure that the ribbon cable has the correct orientation? I made this mistake often in the past. In general it's a twisted cable (one connector looks up, one connector looks down, cable straight).

Pictures might help!

Edited by FantomXR

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Thanks for replying, I dont think there is a twist. Can you confirm please

39118996_486219961805512_7154726752705576960_n.jpg

39153093_1837484969692764_2379415820469010432_n.jpg

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I had to use male to male connectors so I could join, cause you cant buy male to female

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Here you can see the main controller behind the RM1X thus the need for the long length :)

38404416_462665720867672_3475040524316966912_n.jpg

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Welcome to the forums!

Two suggestions/remarks:

a) take photos of the end connectors of the original cable, there is a mark on every IDC connector, marking "pin 1". It is usally an arrow. When building a clone cable, make sure you replicate it in a way, that the orientation of the new connectors is identical, with the connector "arrow" marks being on the identical wire strands.

b) unfortunately, cable length can be an issue. We ran into a cable length problem with an OLED recently, that was triggered by just adding 20cm of ribbon wire length. Yes, we would not have believed it earlier on :). So, if it still does not work after step a), try to reduce your cable length and see when it works.

Good luck,
Peter

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Thanks and Hi Peter, yes I am aware of the arrow marking pin1 thanks. Maybe its not possible to join 2 females using a male to male? maybe I need to chop off the ends and solder. What are your thoughts please?

Not sure if these photos will help, 2nd photo is the original cables from the keybed

39136569_261665511112468_8683091642376257536_n.jpg

39167201_660708374297304_7082703024484777984_n.jpg

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Oops, I think I finally see the problem, these cables cant be joined this way. Am I right? Up till now Iv'e been thinking as long as the red is on the same side it would work but no I see now that doing that puts pin1 on the bottom row instead of the top. Does this make sense at all? :) I think I should solder, what do you think guys?

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Yes it makes sense, one side of your ribbon seems to be wrong (left connector on your picture)

4 hours ago, Gregmidi said:

 

39153093_1837484969692764_2379415820469010432_n.jpg

Welcome here...
Best regards
Bruno

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Thanks Bruno, I'll let you guys know if it works tomorrow... going to bed now :)

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Hi guys, about to do some soldering and just want to check the configuration on a 20 pin IDC. Is it correct that pin 2 is directly underneath pin 1? thanks :)

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Yes it seems I found out the hard way lol... thanks for the links also... but good news anyway guys its all working now that I have soldered it... seems ribbon can work over longer lengths after all :) Thanks for all your help guys, take care :)

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