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How to Fix Microsoft Mouse 3500 Wheel Scrolling Issue - Jump or Random Movement

 It is hard to deny the fact that a mouse is one of most important peripheral devices of a desktop or laptop computer - inexpensive and portable input device. Personally I don't want to replace it with other alternatives such as trackpad, trackball or trackpoint. 

 Microsoft 3500 is one of reasonably priced wireless mouse products available in the market. You may experience small or large troubles while using any mouse products. I experienced jumping or random movement while scrolling the web pages or zooming a object in and out in 3D software such as Solidworks or Blender. The quick and easy actions we can take is to replace battery, check other software, restart the computer, reinstall the mouse driver, switch USB port, and so on. Since my gut told me it would be a physical issue, I decided to open the mouse and check the wheel. 

 First I thought simply cleaning dust around the wheel would be sufficient. According to previous experiences of other mouse product, the dust collected around the scroll wheel could block the optical sensor and cause the abnormal operation. I realized that Microsoft 3500 uses the rotary encoder as shown below. The size may be different but the shape looks identical to that of mine. 

https://www.kailhswitch.com/mouse-encoder/rotary-encoder/11mm-encoder-used-in-mouse186.html


 All right. Time to open the mouse and look into it. Let's get started. 
  • Step 1: Prepare 6mm torx driver bits and loosen 3 screws hidden under 2 mouse feet pads. 2 screws at front and 1 screw at rear.
  • Step 2: Hold and push the rotary encoder toward the mouse wheel to improve hex shaft engagement. 
  • Step 3: See if the rotary wheel encoder is vertically aligned with the mouse wheel. You may check jumping or random movement is gone during the scroll operation before closing the mouse. 


 Since the mouse is cheap and easy to buy from any nearby electronics store, we can quickly decide to throw away the troubled one and buy a new one. However you can get its breath back with a little effort, extend the product life aaaand save the earth. Money saving is extra benefit, of course :)  
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