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【D】
Adjusting the Pedal Sensor
[Preparation]
・Phillips Screwdriver No.2
In the GP-ATX2, the sensors sensing the movement of pedals are housed in the box located over the pedal
rods. A type of guard called "push nut" is fixed on the pedal rod, and this drives functionally the volume
(for Loud pedal) and the limit switches (for Soft sensor and Sostenuto sensor) linked with the movement
of the pedal. If the timing of pedal effect for the electronic sound seems odd or it does not work, adjust
these sensors by moving them upwards or downwards.
[Work Procedure]
【D-1】 Loosen and remove the set screws (total 4) from both sides of the cover.
【D-2】 Moving the pedal, check if the positional relationship of push nut, switch and volume is correct.
【D-3】 Loosen the set screws that are fastening the sensor stay on the case, then adjust the sensor by
moving it upwards and downwards.
※ While listening to the sound through the headphone, press down the damper pedal and check
the timing of disengagement of the damper from the string and the effect of the damper on
the electronic sound; then adjust the switch positions accordingly.
【D-4】 If the sensor looks normal but it does not work properly, one of its parts could be faulty.Replace
it accordingly.
Loosen four screws on both
sides and remove the cover.
Adjust by tightening
the screw
Loud Pedal Rod
All manuals and user guides at all-guides.com
When pressed down
Soft Pedal Rod
Sostenuto Pedal Rod
– 12 –
【E】Adjusting the Actuator (Transducer)
[Preparation]
・Phillips Screwdriver No.2
・10 mm Wrench
The GP-ATX2-f is equipped with a soundboard speaker.
The actuator (transducer) must be pushed down with proper force on the soundboard, so that the
soundboard can vibrate efficiently and emit the sound properly.
The adjustments are always rigorously performed at the factory before shipping. If re-adjustment is
needed due to age deterioration or malfunction, please implement the following procedure.
[Work Procedure] － Adjusting the Transducer －
This procedure should be done in case the soundboard speaker emits clipping noise etc.
【E-1】 Turn the power off.
【E-2】 Loosen the four screws ④ that fasten
the transducer (actuator) cover ① to
remove the cover.
【E-3】 Loosen nut ③ using the 10 mm wrench.
【E-4】 Looking at adjust screw ④ from
underneath, rotate it clockwise to
loosen once. Again, looking at adjust
screw ④ from underneath, rotate
it counterclockwise and adjust the
position so that the actuator cushion
⑥ comes in touch with the soundboard
(the torque for ④ becomes heavier).
【E-5】 Rotate adjust screw ④ counterclockwise
one more time (always looking up
from underneath) and push actuator
(transducer) ⑤ down on the soundboard
underface.
【E-6】 Tighten nut ③ to fasten the actuator.
Check if nut ⑦ is not loose. If it is
loose, tighten it up using the wrench.
【E-7】 Reinstall the cover of the transducer
with four screws.
Speaker relay 2
Cable (L)
KPBB-0806
＊Pass through the
notching of the
②
actuator cover.
Soundboard
Support
⑤
⑦
④
③
①
②
⑥
⑤
④
③
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