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geekhack Projects => Making Stuff Together! => Topic started by: gustavQ on Fri, 20 June 2014, 17:20:09

Title: Help to diagnosticate problem on Unitek k-156
Post by: gustavQ on Fri, 20 June 2014, 17:20:09

Hi everyone,

I found this UNITEK k-156 with Cherry MX black switches a few days ago and I want to use it. Today I managed to try the keyboard using a DIN to PS/2 connector, and PS/2 to USB, this one to be more precise:
 http://www.clickykeyboard.com/_ebay/modelm_usb/modelm_usb-001.jpg (http://www.clickykeyboard.com/_ebay/modelm_usb/modelm_usb-001.jpg) .

What happens is when I connect the keyboard the caps lock, num lock, scroll lock lights turn on and immediately after they stay constantly with a slight light, the following video shows the effect:
https://www.dropbox.com/s/f4ds0qnrer9hmv9/WP_20140620_005.mp4 (https://www.dropbox.com/s/f4ds0qnrer9hmv9/WP_20140620_005.mp4)

After this the keyboard doesn't detect any key action.

I measured the voltage at the entry of the keyboard and appears to be with normal values, ~4.85V.
What could it be? It is something related with the connection I made with the DIN and the USB adapter?

Any suggestion?
Thanks.

Title: Re: Help to diagnosticate problem on Unitek k-156
Post by: IvanIvanovich on Sat, 21 June 2014, 07:08:08

I had one of those once. It work fine on modern PC just need to make sure it switch is on AT mode not XT.

Title: Re: Help to diagnosticate problem on Unitek k-156
Post by: gustavQ on Sat, 21 June 2014, 07:21:24

It was the cable, for some reason the original cable is broken somewhere. The strange thing is that, I get signal in the correspondent ends of the wires, but when I connect the cable I just have the behavior that I demonstrate in the video above. I changed to another DIN cable and now works like a charm.

Title: Re: Help to diagnosticate problem on Unitek k-156
Post by: IvanIvanovich on Sat, 21 June 2014, 13:54:02

Way to go.  :thumb: