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First step would be to clean the sensor inside the ball housing. Remove the ball (turn retaining ring on bottom or simply pull out) and clean the sensor area free of debris or dust using cotton swabs or klenex. Next step would be to ensure that you have have no wireless devices such as a cordless phone or wireless routers in close proximity that may interfere with the signal. Finally, test on another computer to see if you gain functionality else it may be time to find a new mouse.
You might have a dirty ball-holder. Reverse the trackman and hit with it your cupped hand, so that the ball gets out. You'll see a cavity with three round metal prongs and a square dark window. Clean the window with a cotton earbud and the prongs with a toothpick, then push gently the ball in place.
If this does not work, verify the area is free of radio interference and the trackman batteries are fully charged. Also try placing the transmitter at different distances and positions; sometimes the handshake between the units is quirky.
Lastly, verify your PC isn't overloaded and that's the cause of the sluggish mouse movements. Of course, if you "feel" a sticky mouse with your fingers, the cause will be mechanical - the first one. But just in case...
Here is a link for the Logitech company. There is a place on the page where you can order your replacement ball. Looks like they cost about $2. Copy and paste the link below in a new window and it should bring up the page you need. Hope this helps.
Background: I have a total of six Logitech trackballs; four of the newer Trackman Wheel model, and two of the older Trackman Marble+ model (as pictured). All but one of them suffer from the problem described by dave48. The fifth, for some mysterious reason, never has this problem.
Solution: The solution I came up with is to light a candle and let melted wax drip onto the red thumb ball. A single drip falling on three random places on the ball usually does the trick. (The wax should dry as soon as it contacts the ball.) I then start moving the ball around to work the wax onto the teflon points. The movement will be VERY rough initially, but will gradually smooth out the more you use it. Sometimes the initial three drips aren't enough and the ball starts getting rough again, so I will melt three more drips of wax onto the ball and work them in as well.
Conclusion: This really seems to do the trick and for some reason the points don't seem to need cleaning as often either. You do have to be careful not to remove the wax when performing a cleaning, however. But if you do happen to remove some wax all you need to do is melt some additional wax onto the ball and work it in like before.
try and contact logitech, but they aregoing to charge you and it may cost more than a new mouse, because they dont really want anyone to have that documation about there new product.
go on line and type the following information:
logitech optical cordless trackman wheel mouse layout and or schematics
Dust has a tendancy to collect under the ball at the 3 contact tips (you should look under the ball)and it is possible enough dust collected when the ball was removed, that the dust particles became a large dust ball and lodged under the ball making it impossible to move!
Remove the ball and clean the area and replace the ball and it should work fine.
it's not really a spring -- it's just a twisted piece of wire. actually, it's what makes your little scroll wheel click when you turn it. place the scrool wheel in the little plastic bracket that holds it with the longest piece of axel (hollow side of wheel) in. then TURN THE BRACKET OVER. the wire goes on the BOTTOM, which is quite counterintuitive. you'll see how it goes -- the smallest end of the wire goes INSIDE the scroll wheel and the kinda squared end of the wire goes into a little hole in the bracket. you'll understand when you look closely at it. once the wire is installed, hold it in place when you turn the bracket/ball/wire assembly over. fit the legs on the bracket into the groves on the base of the trackball -- that's the side where the ball sits and the circuit board is. make sure the scroll wheel passes through the trackball cover when putting it all back together. VOILA! problem solved.