I have in my home a Microsoft wireless keyboard which uses 3 AA batteries.
It transmits to a nearby receiver which is connected to a USB port on the
computer. When the keyboard was new, the batteries would last for 7 or 8
months. For some strange reason, I'm now changing them monthly.
Recently, I was away for a week and the system was completely shut down.
When I returned and booted up, the keyboard was lifeless. I tested the
batteries, and they tested completely and totally drained on my meter.
That's unusual, because they usually test just weak when I replace them.
So, while I was gone and the system was off, something drained the batteries
At first, I assumed it was the keyboard, so I replaced it with another one
of the same model, an older one that I still had on hand. Same result, one
month. Does this make sense to anyone? Thanks.
maybe a stuck key that causes the keyboard to constantly emit the IR
signal? Or something pressing a key.... something laying on the KB?
Or dirt/crud causing leakage that makes the KB emit the IR signal
Idea;try using a digital camera to view the IR emitter to see if it's on
when there's no keys depressed. Press a key to see what happens that
Maybe you should switch to those pre-charged NiMH rechargeables.
They hold their charge much better than ordinary NiMH cells.
Then you can recharge them every so often and not buy so many alkaline
as a last resort,you could clean your KB in the auto dishwasher(alone,not
with dishes..) and dry -thoroughly- with a hair dryer.
use a gel detergent,not the abrasive powder detergents.
Many of them are RF (radio). There is no IR to see. All I can think
of that would affect both your current as well as the older
replacement keyboard are leaky capacitors that cause more current
drain than the design called for. If that's it, it would be age
related rather than usage related. Or, as others said, someone places
something on your keyboard that presses a key continuously. You
probalby would have noticed that. Good luck.
It is old, maybe 7-8 years, and you're right, it is RF. I should have
realized that. I should probably get a new one, but I've yet to see one
with a special key assortment/selection that I like as much. Plus, the
Windows 7 drivers work well.
you have to find where the IR port is.
Should be a dark plastic window somewhere,most likely on the back edge of
You can check your camera's IR response with a TV remote.
If you can't see the TV remote's LED with your camera,then the
camera has a filter that blocks IR,and will not work for the keyboard test.
You can buy an ir detector for a few dollars at any electronics parts
store. It's basically a business card with a little ir sensitive patch
in the middle that glows red when IR hits it.
You can probably find it cheaper than this example. Maybe try ebay...
Rechargeable batteries are not a good choice for his keyboard
because it uses three cells. If he leaves the rechargeable cells in
the keyboard until it no longer works, one of the three cells will
be reversed and ruined most of the time.
Some devices are designed to use rechargeable cells. They shut off
when the voltage drops to around 1.0 to 1.1 volts per cell. Devices
that use just one or two cells can not reverse cells.
I don't understand why they make gourmet cat foods. I have
known many cats in my life and none of them were gourmets.
They were all gourmands!
If no keys have been pressed after a while, it should be asleep.
Leave it to microsoft to design a keyboard whose sleep timer is
disfunctional. You can set it next to your windows PC whose monitor
fails to shut off 20% of the time. Creating a timer and reliably
counting down to turn off a monitor is beyond microsoft's technical
skills. I wouldn't expect them to be able to do it on a keyboard
Yup... Your computer fails to "shut off" by going into the sleep
mode because some update is processing and interrupting that
process midstream would corrupt files and settings on your system
that you would not be able to recover from without a wipe and
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