By July 14, 2010

How to Fix a Jumpy Rosewill 8500 Wireless Mouse Scroll Wheel

I love my Rosewill 8500 wireless mouse from I like it so much I bought an extra for work, and one for my desktop machine.

I’ve used the mouse quite a bit over the last three months. Two things have happened since then:

1) I killed the battery that came with the mouse.
2) The scroll wheel started to “jump” down about half a click when I used it.

The latter was a big deal. Sometimes I would scroll down a particularly long Web page and then the screen would move about two paragraphs. This was distracting and I often lost my place.

Even more annoying was that the problem with the scroll wheel didn’t happen all the time. At first it was every one out of ten spins. Then it was one in four. Then it was a 50/50 crap shoot for random scrolling insanity.

The Rosewill 8500 comes with a 30 day replacement guarantee from NewEgg, and then a year warranty from Rosewill. I didn’t want to mail in my $30 mouse and then be charged for a repair, so I decided to crack open the mouse myself to see what I could do.

If I succeeded, I’d have my favorite mouse back. If I failed, I had several others to replace it — and it’d make for an interesting Gibberish entry.

Step 1: Don’t be a donkey.

There is a laser on the bottom of the mouse. Don’t be a knuckledragger and work on this thing while it still has juice. Turn the mouse off with the ON/OFF switch on the bottom. Remove the battery and set it aside.

Step 2: Remove the slider stickers on the bottom of the mouse.

I used a small standard screwdriver to gently pry the sliders off.

Step 3: Remove the body screws

There are three, short screws that hold the mouse together. I used a small Philips head screwdriver for this.

Step 4: Remove the upper mouse shell

I expected the bottom of the mouse to be flat, like a base plate. I had a hard time taking the mouse apart until I realized the bottom is the biggest piece of the body. The sides of the 8500 are attached to the bottom — so I was prying and prying without realizing that I was holding one big piece of plastic.

An easier way to look at it is remove the upper shell of the mouse. Set the mouse flat and then lift the top off.

Step 5: Remove the mouse wheel

The scroll wheel is attached by a single plastic peg to a single plastic hole in the mouse. If you are looking at the rear of the mouse, you have to pull the wheel to your right. It’ll be obvious to you once you disassemble the mouse.

Step 6: Clean the mouse wheel and mouse wheel slot

I didn’t need to do this, but I did anyway. If you’ve had your mouse for awhile, or use it in a dirty environment, you may benefit from cleaning the mouse wheel and the slot in the upper shell. I used Krud Kutter, but rubbing alcohol or whatever will do.

Step 7: Reassemble and test

I noticed that the scroll wheel was a little loose when I removed it (step 5), so I figured that was my problem. I put the mouse back together and gave the scroll wheel a quick little test on Ars Technica. Everything was back to normal, and the mouse wheel has stopped jumping around.

Give this a try if you’re having a problem with your Rosewill 8500 wireless mouse. I remember reading someone’s review on NewEgg about how the scroll wheel crapped out on them; maybe if they’d tried this quick fix they would be back in business.

Posted in: technology

6 Comments on "How to Fix a Jumpy Rosewill 8500 Wireless Mouse Scroll Wheel"

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  1. Tim says:

    Awsome. I have 2 Rosewill Rf 800 mice and both have started the jumpy scrolling. Followed your technique and even though they didn’t look dirty – this worked !!!. Maybe it was an alignment thing. MANY THANKS

  2. DrFaulken says:

    Hi Tim, glad it worked for you. My fix lasted about two weeks before it got too loose again. I switched over to Logitech mice.

  3. Thank you so much for these instructions.
    I had exactly the same problem; in our case it was fine cat fur under the scroll wheel!

  4. Johan says:

    Thanks for the instructions. My wheel got better, but still not a 100%. I only use mine as a spare so it will do until I can buy a new mouse.

  5. Marc says:

    Thanks for the info, this helped me return my mouse to 95% or so. I don’t think the dust is on the wheel itself or the slot shown in step 6 (since those surfaces don’t “sense” anything), but rather in the black switch that the clear wheel peg plugs into…to the left of wheel in step 5 photo. That’s the place to concentrate cleaning with a solvent and compressed air.

  6. Martin says:

    Thanks for the guide. Worked and 100% fixed my scroll. The tricky part is not to press too much the wheel back in it’s hole. Too much and it’s stuck not turning, too less and it’s back jumpy. on the third time I got it right.