Synths and keyboards
Keys, controls, displays, ports, memory, internal batteries and updates.
Keys and mechanical controls can change gradually before they stop working.
Notice noisier keys, slow return, inconsistent velocity, encoders that skip values or irregular sliders. Clean externally without allowing liquids into gaps.
If a problem affects several keys or controls together, document the pattern; this can be more useful diagnostically than a simple list of “faulty” components.
Displays, USB, MIDI, audio and power ports can be mechanically vulnerable.
Avoid tight cables or connectors that lever against a socket. During transport, disconnect anything that does not need to remain fitted and protect protruding controls.
For display cleaning, use only methods compatible with the surface; some coatings scratch or react with common cleaners.
Some instruments use internal batteries or other systems to retain data, clock settings or configuration.
Before replacing an internal battery, verify the specified procedure, whether a backup is required and whether access involves disassembly or soldering. On older instruments a leaking battery can become a serious problem, so do not ignore warning signs or manufacturer service intervals.
If access requires technical skills, save available data first and use a professional technician.