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[Preparation]
・Phillips Screwdriver Large
・Phillips Screwdriver No.2 (longer shaft)
・8 mm Wrench
・Capstan Pliers
・Let-off measuring jig (if the jig for 4 mm is not available, use the one for 3 mm)
In the GP-ATX2, the hammer shank stops just before the string using the stop rail (let-off is 4 mm) in order to
enhance the pianist's key touch feel and expression, and to keep the same touch feel even when in silent mode.
For this reason, it is very important to adjust the let-off and the height of the stop rail not only for the key
touch feel but also for the mute function.
These two have mutual relationship, so that you need to adjust them both at one time.
These adjustments also influence the sensing efficiency of the musical performance by the sensor. After
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check and adjust)
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 entire stop rail height －
Follow these procedures for adjusting the stop rail height across the board in case the muting functionality
becomes lower throughout all keys.
【B-1】 Pull the mute lever located under the keybed (at the treble side) to switch to the Silent Mode.
【B-2】 Adjust the let-off of No.1 key (or any other keys) by 4 mm using the jig.
＊ If the 4 mm jig is not available, adjust it by 4 mm by visual judgment using the 3 mm jig
instead.
【B-3】
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using the 8 mm wrench. After loosening the lock nut, put the action back into the piano and set back the
set lever, then place the keyblock at the bass side. (It is recommended not to tighten the screw fully)
【B-4】 Adjust the height of the stop rail aligning it to the let-off position of the hammer shank for No.1
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＊ Depress the key slowly several times, rotate the adjust screw (Figure 1), and move the stop
rail as close as possible to the let-off position of the hammer shank.
Rotate clockwise : stop rail lowers, Rotate counterclockwise : stop rail lifts.
＊ Using a longer Phillips screwdriver No.2 it is possible to perform the adjustment while keeping
the action inside the piano.
＊ Looking through the interspace of the shank flange makes the work easier.
＊ In this situation, when the action comes forward, the stop rail lifts and it becomes ready to
emit sound (i.e. to strike the string). In such a case, it is better to work on it while holding
down the reed end of the bass section by hand (For this reason, the keyblock is placed first.)
Caution : Never perform any adjustment using a wire at the mute lever side.
Changing the tension of the wire may produce abnormal noise due to interposition of
the internal parts.
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【B-5】 Check the muting state.
＊ Criteria for judging
・ Hit strongly each section of the keyboard five times in a row with three fingers of your
dominant hand, and make sure that the hammer does not strike the string.
・ If the string was hit during the above, repeat the procedure from 【B-2】 for re-adjusting.
【B-6】 After finishing the adjustment, pull out the action and tighten the lock nut without changing the
adjust screw position.
【B-7】 Put the action back into the piano and re-install keyslip, keyblock and fallboard.
Set back the mute lever if needed.
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Lock nut
– 9 –
Stop rail
goes up
goes down
Adjust screw
Figure 1
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