Key Bounce?

Hi, just to throw my recent post in too. I've had the bounce a few times but it's usually more than one leeeeeeeetter. My main problem is key "slip". One or two letters not appearing, often the first one I type. I think it coincides with the caps lock light blinking on. Has anyone noticed that?

just another dual core iMac user with the same issue. i've been using computers since thhe 80s and never experienced this before. i would gguess it is a hardware issue, not a software issue. as you can see, i can type a paragraph and it will only throw up 1-2 errors -- my problems are mostly with thhe "h" key and "g" key, as above

I am experiencing this also on my month old iBook. Both Mac mini's work fine with the USB keyboard I bought at the same time from the Apple Store.

De-bouncing of keys (switches in general) is one of the most basic things one learns to do in electronics. Seems sad to see that this is an issue on Apple hardware.

I have noted that this happens when I type hard. If I use a softer touch it is not an issue but then that is what one would expect mechanically. A bounce happens when the the key activates in rapid succession due to bouncing on the spring between the bottom stop and the finger. That is what key latching is supposed to hhelp prevent. (there it goes)

I don't actually think it's an electromechanical problem, but something more specific to the USB controller in the Mac. I've plugged the same ("key bounce" Apple) USB keyboard into other Macs and haven't experienced the problem in that scenario. Switch back to my iMac and the keys start bouncing again. Of course, a couple posts above has somebody using a different keyboard with a Mac that was previously "bouncy", and seems to have solved the problem... odd.



20" intel iMac Mac OS X (10.4.6) 1.5GB RAM

I bought a Mac Mini recently (Intel Dual Core 1.66) and am having the "double letter" problem occur approximately once per couple of sentences typed, which has gotten really annoying. I bought the standard Mac keyboard with the Mac Mini. Speed of typing doesn't seem to matter, since typing "very slowly and carefully" does not keep the problem from occurring. The problem happens with different letters and is not limited to one specific letter.

This is the only "glitch" I've encountered.

When having the RAM in the Mac Mini upped from 512MB to 2GB, I took that keyboard in (to Mac Resource here in Huntsville, AL, where I bought the machine) and told them what it was doing. They hooked it to a Mac Mini on display and when I typed the first sentence "Now is the time for all good men...", I got a double "f". The person working there typed a similar sentence multiple times and never got the problem. I then tried typing "The quick brown fox jumps over the lazy dog." (since it uses every letter) 10 times and never got it to happen. Of course, there may be a difference in typing standing and typing while sitting if sensitivity to a certain style is an issue.

The guy in Mac Resource recommended I do a "repair disc permissions" since it sounded like a software issue. I did, and that did not help. When I type English text or variable names in C++ programs, the double stuff happens often, which really slows me down.

All I can do now is either get the keyboard replaced under warranty, but from what I've read, people who get replacements still have the problem, or buy a different keyboard to use with the machine.

I am interested to see if a definite resolution appears for this problem.

The "double letter" problem never appears on my Macbook with its built-in keyboard. I'll have to try using the suspicious keyboard with other machines to see if the problem follows it.


Mac Mini, MacBook Mac OS X (10.4.7)

After more investigation on my "double letter" problem that is the same as others are describing here, I found that the problem followed the keyboard. Today at lunch, I hooked the problematic keyboard into a Windows desktop machine's USB port and it seemed to work fine for the first paragraph I typed, but in the second and third paragraphs, it started the "double letter" stuff again, and it happened 5 times within a couple of minutes. That tells me it's the keyboard and not the computer.

I then returned the keyboard to Mac Resource here in town and got the "Matias tactilepro" keyboard and have had no "double letter" problems with it while testing it out in the office, so hopefully, this will resolve the problem.

I went ahead and got the expensive keyboard since it has a 5 year warranty and I'll be using it for both code-writing and doing English (LJ posts, email, chat). It was maddening having to backspace constantly to correct double letters in C++ variable names while programming. It's the first keyboard I've ever used that behaved that way, and I've been programming since 1984.


Mac Mini, MacBook Mac OS X (10.4.7)

I have an iMac G3 that I use a Kensington wireless keyboard and mouse with. That keyboard has this problem when it needs the batteries changed.

Don't notice this at all on my Core Duo.

Guys

Just to let you know I have a key bounce problem on a bluetooth keyboard.

I get the same problem on my iMac 20 inch. I've always assumed that I was hitting the keys too hard, so all I've done is to type softer.

Not sure if it's really made any difference though.

I thought I'd give this thread a 'bump' as I am still experiencing this problem. I have changed keyboards, using an older keyboard that works perfectly on other Macs, but thee problem remains.

Did you try testing for a faulty usb port? Try plugging the keyboard into another port on the iMac