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I disassembled my Microsoft Wireless Mobile Mouse 4000.
You need a set of precision screwdrivers to do this.
1. Peel up the teflon pad on the bottom of the mouse with a flat head screwdriver. Leave the other (the one under your fingertips) alone. 2. That will reveal a tiny silver screw. Remove that and then lift the gray upper section up from the back, then pull it free by moving it toward the back. The clips up at the front go in a forward direction, but they are not clipped in. You could just shake it free. 3. There are 4 tiny black screws. 2 at the front and 2 at the back. Remove them. 4. Use a flathead screwdriver to pry the retainer clip from the back of the mouse. It's just held on by a couple of little nubs. Don't break it. Be gentle with this part. 5. Now, the mouse can come apart. You need to pull the bottom of it free at the back and then slide the entire bottom section back. There is a little piece of circuit board that sticks out underneath the right-click area that will get hung up on the upper shell if you try to pull it straight down. This will take a little bit of prying since it's all clipped together, but it will come loose.
That's it. I didn't take any of the inner parts apart after that. I will say that my sticky scroll wheel was scraping against the upper shell. By loosening the two screws at the front, it relieved some pressure and let it run more smoothly. I didn't actually have to take it all apart after step 2 in order to fix that issue.
The Spring goes on the right side of the mouse wheel as it would be pointing at your computer. It supports the wheel to make it spring back when preasure is applied. Place the spring on the axle with the spring forming an spread out "A" (not a "V"). You will see that it falls nicely into the 2 little tower mounts. my real problem was with the other little piece of bent wire that fell out. This is the part that makes the snaping fealing as you scroll the wheel. This connects directly on the plastic part that is mounted on the scroll wheel. If you look at that plastic part you will see a small hole. One end goes in that hole & the other rounded end goes to the splines on the wheel itself. I hope this helps, it better that just saying go buy another.
From underneath you can unscrew the piece holding in the trackball; from here my tool of choice is a pencil eraser. Rub away at the gummed up rollers until you are sure they are clean.
Unscrew the mouse and take it apart. You will find the rollers will "pop" out of their clips (be careful not to apply too much pressure or you can break a clip). Once out, it's very easy to clean the rollers thoroughly. One of the rollers will usually be spring loaded so keep an eye on the spring when disassembling. The process for putting the rollers back is just as they came out with the spring loaded roller put back last (easier to place other rollers first as they don't move once they are in. Once the rollers are in, re-assemble the mouse, replace the trackball and you're in business.
I've been doing this with my old USB mouse for years, still working great after 5 years!
Hope this answers your question and best of luck to you!
I bit the bullet and peeled up the two bottom corners of that sticker and sure enough, there were two short Phillips screws there holding the assembly together. With those removed, it came apart nicely (be careful and don't lose the little idler roller when you dissect the assembly) and the rollers and their shafts can be thoroughly cleaned using tweezers and alcohol. Works perfectly again.
I put together what I knew where it went, the put the whole thing together and looked at it before putting in the screws. I saw a hole and remembered a "button" there that moved sideways with a spring pushing it back into the original place. I reopened and after examining the part put it in that slot. I then put it together and it worked. I put the screws back in then and all is well Thank you for the reply. Glad I found your site. I will keep it if I ever need any help. Kathryn
Peel up the lower corners of the serial number sticker on the bottom side of the trackball to expose the two Phillips screws that hold the assembly together. Remove those and take the top off. Lift out the circuit board and be careful not to lose the little idler roller that sits thereon. Unplug the cable and you can then access the rollers with ease. Clean them with alcohol and remove any fuzz or dirt with tweezers, and it all goes back together the way it disassembled and should work fine again. Takes less than ten minutes.
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.
Well I did it. It's not exactly easy to describe. I accidently took mine apart trying to clean the roller ball and out popped the 2 springs. I sort of put it back together in "reverse". In other words, I put it together without the scroll device and then looked through the hole. By doing this, I figured it out -- when you know it's simple but to describe it without pictures is almost impossible. Mine works fine now but I don't know how to help you.