Synths and keyboards
Hardware revisions, replaced components, membranes, displays, memory and maintenance on older electronic instruments.
On vintage synths and keyboards, identify hardware revision, installed boards and significant replaced components when documentation is available.
Models with the same name may contain meaningful production changes. A replacement board may be correct and fully functional without being original to the unit.
Keep invoices and workshop notes, especially when scarce components are replaced.
Avoid irreversible updates or modifications before understanding compatibility, backup options and the possibility of returning to the previous configuration.
Keybeds, membranes, displays, encoders, sliders and buttons are wear-prone parts. Replacement may make the instrument far more usable without necessarily changing its primary sonic identity.
Record which components were replaced, whether replacements are original, compatible or modern, and whether the original parts remain.
Also check key consistency, display readability and control response, because good cosmetics do not guarantee full functionality.
For collectors, documented maintenance and transparency are often more useful than a generic “never opened” claim.
On digital or hybrid instruments, configuration is not limited to visible hardware. Firmware, ROMs, memory expansions, storage and internal modifications can change features and compatibility.
Before buying or selling, record the software version where verifiable, installed expansions and differences from standard configuration.
If an update is irreversible or requires specific hardware, treat it as a significant modification.
Keep legitimate backups and maintenance files where appropriate, without confusing installed content with the physical originality of the instrument.