Yamaha Tubas Owner's Manual - Page 16

Troubleshooting Tone is not clear and pitch is poor. • The valve felt or cork is damaged. ➞ Replace the felt or cork with a new one. • A large amount of dirt has accumulated inside the instrument. ➞ Wash it out. • There is a large dent in the tubing or air is leaking. Or the mouthpiece is loose and air is leaking from around the mouthpiece. ➞ Contact the dealer from whom you purchased the instrument. No sound. • The holes in the pistons are not aligned with the holes in the valve casings. ➞ Make sure that the number stamped on the piston matches the number stamped on the valve casing. The valves are sluggish. • Dirt has accumulated between the pistons and valve casings. ➞ Clean the inside of the valves. • Dust has scratched the inside of the valve casings. ➞ Wash out the dust as soon as possible. • Dropping or hitting the piston has damaged it. ➞ Never use the instrument with a damaged piston. Contact the dealer from whom you purchased the instrument. • The pistons or valve casings are corroded. ➞ Contact the dealer from whom you purchased the instrument. The rotors are sluggish. • Dirt has accumulated between the rotors and valve casings. ➞ Oil the lever mechanisms with lever oil. ➞ Contact the dealer from whom you purchased the instrument. 32 The valve slide is stuck and cannot be removed. The slide is sluggish. • There is dirt or dust inside the slide. ➞ Thoroughly remove dirt and apply some slide grease that matches the type of slide. Or apply some tuning slide oil to the slide. • 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. • Hitting the instrument has damaged the screw. ➞ Contact the dealer from whom you purchased the instrument. Air does not pass through the instrument. • The piston is in the wrong valve casing. ➞ Set the piston into its proper valve casing. The mouthpiece cannot be removed. • The instrument was dropped or hit with the mouthpiece attached. Or, the mouthpiece was inserted with too much 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 an abnormal sound when played. • Solder on the instrument has come loose, or a foreign object is in the pipe. ➞ Contact the dealer from whom you purchased the instrument.