Replacing The Head - Yamaha TP-4000 Owner's Manual

Replacing The Head

1
To prevent the pedal from being pulled down by
the spring force, the heel of the pedal must be
kept down (this can easily be accomplished by
placing a piece of wood or a softball between
the base and the pedal) while the tuning bolts
are loosened alternately in the proper sequence.
Softball etc.
Never put your hands etc. under the
Caution
pedal.
2
After removing all tuning bolts, mark the pedal
side of the hoop with cellophane tape etc. and
then remove the head together with the hoop. At
this time, be careful not to lose any of the tuning
bolts and prevent dust from adhering.
Also, avoid touching the tuning bolt threads, as
they are greased.
Pedal
* Be careful not to make any scratches in the tape
attached to the kettle edge. If the tape is peeling or
badly damaged, it must be replaced with timpani
edge tape (Teflon™ tape).
Hoop
Cellophane tape
3
Place the new head with the hoop on the kettle.
When using a Yamaha timpani head, its YAMAHA
logo must be on the side opposite the pedal.
The hoop must be re-mounted in the same po-
sition as marked with cellophane tape in step
Tighten the tuning bolts alternately by hand until
the head is tensioned slightly. At this time, make
sure that head and hoop are centered on the
kettle.
Tighten each tuning bolt an additional 1/4 of a
turn using the timpani key. Repeat at least 4
times.
4
Adjust the timpani as described on pages 4 and
5, "Before Using The Pedal Timpani", starting
5
with step . For precise tuning, refer to the section
"Adjusting The Sound Of Your Timpani" on
page 6.
G Interval For Head Replacement
The maximum head life normally is approxi-
mately 2 years and depends on the frequency
and duration of use. However, the head should
always be replaced before the sound quality
deteriorates dramatically. If a head is left on
and used more than two years, the following
problems may occur:
• It may become impossible to tune the
head to the proper pitch range.
• It may become impossible to balance
the pedal.
• The main unit mechanisms themselves
may become damaged.
When the head is slightly tensioned and its
surface looks wavy or shows dents, it is time to
replace the head with a new one.
2
.
11