Yamaha YFL-24S Owners Manual - Page 7

■ Putting the instrument in its case First, wipe off moisture and dirt from the joints, then place the headjoint into the case. Fit it into the case snugly, without forcing. 21 When closing the case, make sure there are no objects such as a gauze or cloth on top of the instrument. Doing so may put unnecessary pressure on the keys causing damage. Also, never leave a damp cloth or gauze, etc., in the case. For instruments with ring key caps, take care not to loosen the caps. These can be freely removed or replaced to change the instrument's tonal character as you please. Key cap Ointments or creams containing sulfur (for acne, etc.) coming in contact with the metal on the instrument can cause discoloration (the metal turns black or brown) of the silver or silver plate. To prevent this, make sure that both hands and face are clean before playing.