Roland TD-20K Owner's Manual page 12

PD-125/PD-105 (V-Pad)
Adjusting the Head
Adjusting the Head Tension
When adjusting, use the included tuning key.
On the PD-125/105, adjusting the head tension affects only the head response, and not the pitch of the sound, as it would on
an acoustic drum. To adjust the pitch, edit the sound parameters of the TD-20. For details refer to the owner's manual.
Heads MUST BE TUNED BEFORE PLAYING.
Like with an acoustic drum, accurate and equal head tension is needed for correct triggering response.
* Head tension that is too loose may not only cause incorrect operation, but may even damage the sensor.
1. Loosen the tuning bolts until a slight gap is produced.
2. Tighten all tuning bolts by fingers, as tightly as you can.
Head tension may change over a period of time, so readjust when necessary.
fig.17.e
3. Using the tuning key, turn the tuning bolts two full revolutions each, thus tightening them.
Tighten each tuning bolt one by one, observing the numerical order shown in the figure.
fig.18
12
Tuning bolt
Washer
1
6
4
Slight gap
Hoop
3
5
2