Replacing The Head - Yamaha TP-8300R series Owner's Manual

Replacing the Head

1
To prevent the pedal from suddenly dropping
due to spring tension, hold the heel end of the
pedal all the way down and place a block of
wood between the pedal and the base.
Caution
Never touch the pedal assembly when
loosening the tension rods (when loos-
ening the head). Also, never place your
fingers or feet in the space under the
pedal, around the base, or the moving
parts. Spring tension may cause the
pedal to suddenly move posing a great
danger.
2
Loosen the tension rods on opposite sides of
the timpani and remove the head. We recom-
mend that you mark the pedal side of the hoop
with a piece of tape, etc. so that the hoop can
be reattached to the same position.
* Avoid touching the tension rod threads,
as they are greased.
3
Remove the hoop and head together.
* Do not let the hoop come in contact with
the bearing edge, etc.
24
Block of Wood, etc.
Hoop
Tape
Pedal
4
Edge tape is applied to the bearing edge. The
tape provides a smooth edge, which is very im-
portant to the operation of the timpani. To pre-
vent damage to the tape, please remove any
dust or dirt.
* If the tape is peeling or badly damaged,
it must be replaced with "Timpani Teflon
Tape" .
5
Place the new head with the hoop on the bowl.
When using a Yamaha timpani head, make
sure its YAMAHA logo is on the side opposite
the pedal.
The hoop must be re-mounted in the same
position as marked with a piece of tape in step
2
. In the proper order, tighten the tension rods
alternately by hand until the head is tensioned
slightly. At this time, make sure that the head
and hoop are centered on the bowl.
Tighten each tension rod an additional 1/4 of
a turn using the timpani key. Repeat at least 4
times.
6
Adjust the timpani as described on page 18
"Initial Preparation" starting with step
precise tuning, refer to the section "Adjusting
the Pitch" on page 20.
Interval for head replacement
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.
The maximum head life normally is ap-
proximately 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 difficult to tune the head
to the proper pitch range.
• It may become difficult to balance the
pedal.
• The main unit mechanisms themselves
may become damaged.
Yamaha recommends replacing the head
every year.
2
. For