Scroll Wheel Test & Encoder Diagnostics
Inspect rotary optical and mechanical encoders for jumping, stuttering, or reversed scrolling.
Middle Mouse Click Test & Rotary Scroll Encoder Diagnostics
Testing your scroll wheel requires verifying both the rotating mechanical encoder ticks and the physical center switch. If you are wondering how to test mouse middle click or experiencing erratic page jumping, this middle mouse click test isolates encoder phase signals in real time.
Why Does My Scroll Wheel Jump Up When Scrolling Down?
Almost all mice use a mechanical rotary encoder (TTC, Kailh, or ALPS) with rotating copper wiper arms. Over months of use, dust, lint, and pet hair enter the open wheel slot and insulate one of the contact wipers. The mouse microcontroller misses a phase pulse and misinterprets downward motion as an upward flick.
How to Test Mouse Wheel Click & Clean Encoder
Learn how to test mouse wheel click and clean your encoder: (1) Deliver short, high-pressure bursts of compressed air into the wheel gap while spinning the wheel; (2) Roll the wheel aggressively against a clean mousepad for 30 seconds; or (3) Replace the encoder with a dust-proof TTC Gold encoder.