Yamaha TP-5020H Benutzerhandbuch - Seite 11

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Replacing The Head

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.

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

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.

Adjust the timpani as described on pages 4 and

5, "Before Using The Pedal Timpani", starting

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.