deskthority

Hi,

I bought an IBM Model M 42H1292 manufactured in IBM UK (Greenock, Scotland) about a year ago from Clickykeyboards. However a few days ago some of its keys stopped working (specifically Esc, ~, 1, Tab, Q, A, Z). There was no spillage or physical damage. I am guessing the membrane is old and has possibly worn out somehow.

This is the EXACT keyboard that I bought:
http://clickykeyboards.com/product/1997 ... -15-09-97/

So I contacted Unicomp for a replacement membrane but they said that a 42H1292 can have one of three possible logic cards/boards and that I will need to send them a picture. The problem is I don't have the 7/32" screw opener handy to open up the keyboard and I live in Pakistan. I will be getting the membrane shipped to the UK and a relative will bring it along therefore time is of the essence!

Can someone please help me identify which logic card/board my keyboard has? A picture that I can send to Unicomp will be even better!

I'm not sure but you should contact clickykeyboards to ask - he can almost certainly tell you.

You can use melted pen trick to make 5.5mm nut driver.

P.S. Take a look at the Model M's matrix here. Your failing keys sit on a single column, so it maybe not necessary to replace the membrane sheets, you just need to carefully remove ribbon connectors from the controller and clear the conact pads with alcohol.

Ah, you've got one of the lower cost UK ones with the controller that the membrane doesn't exactly plug into, rather is pressed against the PCB for contact. Chances are that your controller still works but you have to clean the interface where the membrane meets the controller. You could use a paper towel and alcohol to do the initial cleaning and retest and that might do it by itself, or if it doesn't, you can put some deoxit on the controller side and that should do it and probably prevent re-occurance.