Yamaha Cornets Owner's Manual - Page 13

Troubleshooting Tone is not clear and pitch is poor. • The valves are dirty. ➞ Clean the valves. • There is a large dent or air is leaking from the trumpet. • The mouthpiece doesn't fit the mouthpiece receiver and air is leaking. ➞ Contact the dealer from whom you purchased the instrument. • The felt or cork is damaged. ➞ Contact the dealer from whom you purchased the instrument. No sound. • The holes in the piston are not aligned with the holes in the valve casing. ➞ Make sure the number stamped on the piston matches the number stamped on the valve casing. The pistons are sluggish. • Dirt has accumulated between the pistons and valve casings. ➞ Clean the inside of the valve casing. • Dropping or hitting the piston has damaged it. ➞ Do not use the instrument with a damaged piston. Contact the dealer from whom you purchased the instrument. • The piston or valve casing is corroded. ➞ Contact the dealer from whom you purchased the instrument. The valve slide is stuck and cannot be removed. The slide is sluggish. • Dirt has accumulated between the valve slide and inner tube. ➞ Thoroughly remove dirt and apply some slide grease that matches the type of slide, or apply some tuning slide oil. • Dropping or hitting the slide has caused a dent, or the slide was bent while cleaning. ➞ Contact the dealer from whom you purchased the instrument. The screw is too tight and cannot be removed. • The screw is corroded. • Dropping or hitting the instrument has damaged the screw. ➞ Contact the dealer from whom you purchased the instrument. Air does not pass thorough the instrument. • The piston is in the wrong valve casing. ➞ Set the piston into the proper valve casing. The mouthpiece cannot be removed. • The instrument was dropped or hit with the mouthpiece attached. Or, the mouthpiece was inserted with force. • The instrument has been left for a long period of time with the mouthpiece inserted in the instrument. ➞ Contact the dealer from whom you purchased the instrument. The instrument makes a strange sound when played. • Solder on the instrument has come loose, or a foreign object is inside it. ➞ Contact the dealer from whom you purchased the instrument. The piston makes a metallic noise when pressed. • The felt is torn or lost. ➞ Please contact the dealer from whom you purchased the instrument. • The cover on the piston valve or valve casing is loose. ➞ Firmly tighten the covers. • The piston's shaft is bent. ➞ Please contact the dealer from whom you purchased the instrument. 25