Yamaha Cornets Owner's Manual - Page 9

Maintenance ■ After playing After playing, make sure that moisture or dirt is removed from the instrument using the method described below. ● Valve slide maintenance 1. Depress the piston that corresponds to the valve slide you want to clean, and remove the slide. ● Other maintenance Apply some valve oil to the pistons and move the piston up and down a few times, the same as you do before playing the instrument. Likewise, apply some rotor oil to the rotors on rotary trumpets and move the levers a few times. Valve oil 3rd valve slide 3rd valve slide stopper screw * If you remove the valve slide without holding the piston down, air pressure in the pipe drops creating a suction that can cause poor piston function or damage to the inside of the pipe. * If the instrument is equipped with a slide stopper screw, loosen the screw before removing the slide. 2. Remove moisture from the slide. Also, re- move moisture from the water key. Main tuning slide * Do not apply too much oil. ● Body maintenance Gently wipe the surface of the instrument with a polishing cloth. If dirt or tarnish is obvious, the following products can be used. For lacquer finishes Polishing cloth + lacquer polish For silver plate Silver cloth + silver polish For a beautiful shine, polish the instrument with a silicone cloth. Water key * Valve slides are made of brass or nickel silver that is excellent at resisting corrosion however, corrosion may appear if moisture is left in the instrument for an extended period of time. Please use caution. 21