Keyboards
Portable keyboards and weighted action keyboards can be repaired, but not something as large as a full size Hammond organ (some of these beast had speakers and need more than one person to even move!).
Common repairs for the lightweight portable keyboards are power socket repairs, after the lead from the power adaptor has taken too much strain. For pro synths longer in the tooth, maybe cleaning the keyboard contacts (when they get dirty, the touch sensitivity varies from key to key).
Some times with keyboards, there has to be an inspection charge at least, as the time taken to get the device apart and back together is considerable even if it is then decided the repair is not viable. This is especially true with some 88 note keyboards.
Contact us for more information if you have a keyboard needing repair.