Key Solenoid Rail Assembly - Solenoid To Key Alignment - QRS Music Technologies QRS PNO3 Installation Manual

Installa on Procedure
Key Solenoid Rail Assembly ‐ Solenoid to Key Alignment
With the piano ac on on your workbench and the fronts of the keys facing away from you. Place the solenoid rail on
the workbench in front of the keytails and put the plungers inside the solenoids. Turn the solenoid rail assembly on its
side, so that the plungers are now parallel to the workbench surface and the felt plunger ps are touching the back
ends of the piano keys. The first plunger should start all the way to the le side of the rail. Secure the rail and ac on
with the two clamps so they will not move during the alignment process. Mark which side is bass and treble. Make
sure all the solenoid plates are free moving. If they are not, use an 11/32" nut driver to loosen them.
The spacing between sec ons has been held in check by the introduc on of solenoid assembly pairs adjacent to the
breaks. Because not all sec ons on a piano will have an even number of notes played in them, those which have an
odd number will require a modified solenoid assembly to provide the addi onal note required, and this modified note
will be placed adjacent to a sec on break or at either end.
Count the number of keys to be played in each sec on. If there is an even number, align the solenoids with plungers
already on the rail with the centers of their respec ve key tails. If the number of keys to be played is odd, simply re‐
move one of the solenoids from the double moun ng bracket and con nue to the alignment of the next sec on.
If necessary, cut away the unused por on of the rail ends with a hack saw and file off all burrs with a metal file. Be
careful not to cut away the rail bracket moun ng holes, or cut any solenoid wires.
Mount all 8 rail support brackets to the rail with the 10‐32 X 7/16" screws and #10 external star washers.
Note: The distance from the bo om of the keybed to the bo om of the keytail felt should be equal to the distance
from the top of the solenoid plunger to the top of the rail moun ng brackets.
At this stage, the key solenoids have been matched up with their corresponding keytails. The rail has been cut to
length, and the rail brackets a ached in place. Put the rail aside for future installa on in the piano.
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