Run the check
Press Space in the dedicated spacebar test and note press and release.
Compare a plain text editor and the original application.
Try another connection and inspect only accessible debris without dismantling the keyboard.
Read the result
A Space event in the test but no inserted space in one app points to its shortcut or text layer.
Limits and next step
The page cannot inspect a stabilizer or measure switch travel.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.