I have had the FK7200 ever since they came out with them. I now have my 3rd and final keyboard with the same problem. The pin rollers under the track ball have worn down, causing the track ball to slow down and skip. That is the only problem with the 3 keyboards. Where can I find parts for these boards? who might have the correct pin rollers?
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If you do have a mouse with a track-ball, then rotate the "ring" that holds the track-ball inside the mouse, to "unlock" the ring. Remove the ring. Look inside the mouse. You'll see two rollers.
Look for accumulated "gunk" in a ring at the center of each roller. Gently scrape each roller, to clean it. Re-insert the mouse. Re-insert the ring. Rotate it, to "lock" the ring into place.
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after the idler is pushed all the way back into the frame.try to put some wood blocks under the track to remove all the slack.use the bucket to push as much of the bottom section under the bottom rollers.use a heavy chain and pull up and over the top of the roller.when you get close you can use the drive to walk it the rest of the way.if it still doesnt go you may have to break the track at the master pin. this is usually marked with a small hole drilled in the end of the pin.heat and beat the pin out,break the track.pull track over top rollers and make ends meet on top of the srocket.use a chainfall to pull two halfs together and line them up.drive pin back in and your all set.
It might be a case where the track ball has some dirt or debris underneath it. First, turn the device off. Next, press down firmly on the track ball while at the same time rolling it in every direction. Hopefully that will knock loose any debris. Another tip to try is to wet your thumb with a little water and do the same thing.
If those two options don't work, you may try taking out the track ball and blowing out the slot with some compressed air. Below is a link that shows how to remove and clean the track ball:
Same problem, wouldn't scroll down. Lifted the ring pulled out the rollerball and cleaned it with alchohol. Used a cotton swab, soaked it pretty good and rolled it around a bit. Set it back in and it worked like new. Watch how you take it out so you can put it back in the same way.