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Keyboard Dead? ADB beeps

3695 Views 8 Replies Latest reply: Apr 8, 2008 3:50 PM by taerchen RSS
taerchen Level 5 Level 5 (5,430 points)
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Apr 1, 2008 12:15 PM
My regularly used PM 9600 suddenly started emitting a "plunk-beep" sound whenever a key on the keyboard was pressed AND the key stroke would not register what it was supposed to do. The power key continued a bit still to initiate shutdown, but that now beeps, too. I tried a second keyboard with the same result. I've replugged in the keyboard and checked that all other cables are tight. I've restarted. I think the battery may be getting tired, as the clock is losing a little time, but otherwise the computer works fine using a Gyration wireless USB keyboard. Any ideas about the ADB keyboard problem, please?
PM9600/233 (OS 8.6;9.1); G3 white iBook (OS X 10.4.10); G4 MacMini (10.4.10), Performa 6320 (OS 8.1); MacPlus (OS 6.0.8)
  • Grant Bennet-Alder Level 8 Level 8 (48,145 points)
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    Apr 1, 2008 5:39 PM (in response to taerchen)
    Under 8 or 9, Pull up the key caps desk accessory and see if there is a stuck key, and that the shift, control, and apple keys (on each side) do as expected.

    Message was edited by: Grant Bennet-Alder
    Q840AV,5500,G3 AIO,G3 B+W,G4/867, Mac OS 8.6 or Earlier, and 9.2, 10.3 and Server - LW IIg, LW 4/600, ATalk ImageWriter LQ
  • Jeff Level 6 Level 6 (11,160 points)
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    Apr 3, 2008 7:25 AM (in response to taerchen)
    Unless you had spilled a liquid into the keyboard, I wouldn't try something as drastic as the dishwasher. The heated domestic water that the dishwasher uses contains chemicals that could be corrosive. If I were to try cleaning a keyboard after a spill, I'd immerse it in a tray of distilled water and have a compressor at hand (not a can of compressed air) to blow out the moisture after draining. I'd still want to disassemble it and completely dry it out. If there are any thrift stores in your area, I'd suggest buying a used ADB keyboard to try. If it works, then you'd know whether you should bother opening up the old one, to look for obvious damage. If it beeps like the original keyboard, then the problem lies elsewhere. At the risk of asking the obvious, are all 4 pins present in the end of the keyboard cable's plug? Does the ADB keyboard make the beeping sound when the wireless keyboard's transceiver is unplugged from the USB port?
  • Jeff Level 6 Level 6 (11,160 points)
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    Apr 4, 2008 10:53 AM (in response to taerchen)
    From the results of your troubleshooting, I'm beginning to think that the ADB port has electrical issues. The ADB port should supply 5 volts, with a maximum current draw of 500 mA. An ADB mouse uses much less current than the keyboard, so your 9600's ADB port may be providing too little voltage or too little power. Using a voltmeter, you'd need to check pins 3 and 4. Looking at the back of the 8600/9600 chassis with its vertically-oriented motherboard, the ADB port has (2) pairs of vertically-aligned holes. The pair of vertically-aligned holes to the right (closest to the A/V module mounting recess) are pins 3 & 4. The upper hole corresponds to pin 4 (ground) and the lower hole corresponds to pin 3 (+5 volts). I'd check that first, before looking elsewhere for the cause(s).

    I referred to using a compressor, because I have one and know that it would provide a significantly stronger blast of air, to force out the residual moisture in the keyboard shell.

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