Unweighted (Synth-Action) Keys

Common on this catalog’s 61-key keyboards, unweighted keys use a simple spring return with no simulated hammer resistance — lighter, easier to press quickly, appropriate for casual play or younger beginners, but not representative of real piano touch, a distinction worth explaining clearly (echoing the sales consultant course’s coverage of this same trade-off).

Weighted and Hammer-Action Keys

Digital pianos in this catalog typically use weighted, hammer-action keys — a mechanism simulating the resistance and rebound feel of an acoustic piano’s hammer mechanism, using actual weighted components or graduated spring/mechanical resistance, so finger technique developed on the instrument transfers to real piano playing.

Diagnosing an Unresponsive or Sticking Key

A key that doesn’t respond, responds inconsistently, or feels physically stuck could be a mechanical action problem (debris under the key, a broken action component) or an electronic sensing problem (the key’s sensor not registering the press correctly) — correctly distinguishing mechanical from electronic cause determines the entire repair approach.

Velocity Sensitivity and Its Common Failure Modes

Velocity sensitivity (the keyboard detecting how hard a key is struck, affecting volume/tone dynamically) relies on sensors under each key — a key that always plays at the same volume regardless of touch force, while still physically pressing normally, points toward a velocity sensor issue specifically, not a general key mechanism problem.