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Author Topic: IBM Model M2 Shift Key doesn't work  (Read 3492 times)

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Offline itzzspencer

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IBM Model M2 Shift Key doesn't work
« on: Tue, 29 March 2011, 16:18:42 »
sorry if im posting in the wrong place. hi i've been lurking around the site for a long time now and recently found a ibm model m2 buckling spring keyboard outside. i took the baby in and followed a m2 repair guide somewhere on this site. i followed the instructions and it was fixed due to faulty capacitors, but now i have a strange problem where my shift keys dont work at all. ive tried on a pc and a mac. both dont work and i tried aqua's key test and no response from there either. neither of the 2 shift keys work. do any of you guys know what could be the problem? thanks in advance

Spencer
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Offline ch_123

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IBM Model M2 Shift Key doesn't work
« Reply #1 on: Tue, 29 March 2011, 17:03:12 »
Dead membrane trace.

Fortunately, due to the construction of the M2, it's easy to get access to the membrane. Determine which membrane traces correlate to the Shift keys (both are usually on the same row trace IIRC) and use a multimeter to find where the failure is. Then get a silver conductive gel pen and use it to draw a new trace over the dead patch.
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Offline itzzspencer

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IBM Model M2 Shift Key doesn't work
« Reply #2 on: Tue, 29 March 2011, 17:34:58 »
sorry, im pretty newbie. by membrane, do you mean the board thats all black that the springs sit on or the motherboard?
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Offline Findecanor

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IBM Model M2 Shift Key doesn't work
« Reply #3 on: Wed, 30 March 2011, 03:54:47 »
The black rubber sheet covers the membrane.
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Offline itzzspencer

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IBM Model M2 Shift Key doesn't work
« Reply #4 on: Wed, 30 March 2011, 12:10:45 »
okay so i just pull off the rubber sheet and look for the faulty trace?
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Offline theferenc

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IBM Model M2 Shift Key doesn't work
« Reply #5 on: Wed, 30 March 2011, 13:54:08 »
Yup. Definitely easier to get at the guts of an M2 than an M, isn't it?
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HHKB Pro 2 -- Custom UNIX layout Unicomp Customizer 101 -- IBM Model M 1391401 (modded to UNIX layout) -- IBM 1397000 (also UNIX layout) -- SSK in UNIX layout -- Model F 122 key in UNIX layout (Soarer USB "native")
 
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Offline ch_123

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IBM Model M2 Shift Key doesn't work
« Reply #6 on: Wed, 30 March 2011, 14:48:55 »
On the other hand, the M2's membrane is more awkward to service than a standard Model M one. Whereas the Model M's one consists of three separate sheets of plastic, the M2 is basically the one sheet of plastic folded into three. Also, instead of connecting into sockets on the controller with a ribbon cable, the controller card has contacts on the underside and is pressed down onto contacts on the membrane. The controller is held in place by some very flimsy plastic latches that are hella easy to break. You've been warned.
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Offline itzzspencer

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IBM Model M2 Shift Key doesn't work
« Reply #7 on: Wed, 30 March 2011, 15:20:23 »
O_O thanks ch_123, hopefully i wont destroy this one
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