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【B】Overview of Hammer Sensor
The GP-ATX2 Hammer Sensing System is composed of three optical sensors to detect the hammer's
movement.The system adopted before AT II was sensinng the keys movements and detecting only two
points in the keys passage.
The New GP-ATX2 Hammer Sensing System remarkably improves the capability of detecting the subtle
key touch and the repeated strokes, and greatly enhances the playability multiplied by the new sound
source.
【B-1】Structure of detector
Figure 4 shows a simplified cross-section view of the GP-ATX2 Hammer Sensing detector.
All 88 keys are equipped with three pair of light emitter/receiver and are deployed as P1, P2 and P3
from the keyboard side.The PS1 unit detects the key being depressed, the PS2 unit detects the auxiliary
signal of the hammer, and the PS3 detects the velocity of the hammer movement.
【B-2】Explanation of Behavior
① Before key is depressed
String All the sensors are conducted.
② Detecting key being depressed
PS1 sensor is blocked.
③ Starting to detect the velocity
PS3 sensor is blocked.
④
PS2 sensor is blocked.
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All manuals and user guides at all-guides.com
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(Strings side)
⑤ Once detection of velocity is completed,
the PS3 sensor is conducted,
and an electronic sound
comes out.
⑥ Hammer being stopped
The hammer shank collides
against the stop rail.
⑦ Starting releasing key
The hammer shank starts
going down.
PS2, and the PS3 sensors
are blocked.
⑧ Detected key being released
PS1 sensor is conducted,
and determines that
the key is released.
The electronic sound ceases.
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– 5 –
Key being
Velocity
Auxiliary
depressed
Sensor Mount Rail
PS3
PS2
PS1
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(Keyboard side)
Sensor PWB A-D Assy.
Sensor Cover
Shutter
Hammer Shank
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