Troubleshooting - Yamaha Cornets Owner's Manual

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 mouth-
piece 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.
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