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PAC adjustment bolt
The PAC (Pedal Adjustment Clutch) is an original
Yamaha mechanism that enables you to adjust the
pedal’s rotational torque (the force required to move
the pedal) by altering the amount of friction within the
pedal balance spring mechanism.
Using the PAC, you can adjust the rotational torque
of the pedal to a comfortable pedal force without
degrading the smooth pedal action. In addition, the
PAC is useful in preventing undesirable happenings
such as slight movement of the pedal when the head
is struck strongly causing a small change in pitch.
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PAC Adjustment
Use the timpani key to turn the PAC adjustment bolt
as follows:
Turn the PAC adjustment bolt to the right (clockwise)
to tighten the pedal movement.
To return the tightened pedal movement to the initial
rotational torque setting, turn the PAC adjustment
bolt to the left (counterclockwise).
* Be sure to turn the timpani key using one hand
only.
* Do not use both hands or an additional tool.
The TP-50xx (H/G) / TP-70xx (H) series use a
wing bolt on the PAC adjustment system.
Note on PAC Usage
• The pedal cannot be locked with the PAC,
even at its tightest position.
(Do not try to use the PAC for locking the
pedal, for example to prevent the toe of the
pedal from jumping up when the head is re-
moved.)
• The PAC adjustment bolt has limit positions in
both turning directions. If the bolt is hard to
turn, do not force to overtighten it because this
may cause damage to the mechanism.
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Pedal Adjustment Clutch
Other Features
2002TIMPANI̲E
02.12.5, 6:27 PM
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