QRS Music Technologies PMII Installation Manual - page 33
33
July 2013
Moun ng & Connec ng the Electronic Components
Mount the Key Solenoid Rail
At this point, the rail has solenoid assembly pairs corresponding to ac ve keys at either end
of each ac on sec on and the rail has been previously cut to length. The piano is standing
on its side; all of the electronics, moun ng hardware and trapwork are in place and func‐
oning.
Since the piano is res ng on its le side, you can install the key solenoid rail easily by
res ng the bass‐most (that is, the lowest) por on of the rail on the lowest end of the lowest
slot and then bringing the treble‐most part of the solenoid rail into the higher slots. The
external parts of the rail assembly will take the brunt of the weight of the key solenoid rail
and spare the more fragile internal structures. You can use a heavy‐duty screwdriver in‐
serted between the bass‐most aspect of the lowest slot and the lowest part of the rail assembly as a simple wedge‐
lever to fine‐tune the rail's precise alignment within the slot‐system. Look inside the keyboard compartment to ob‐
serve the alignment of the solenoid plungers alignment with their respec ve key‐tails. If these are not sa sfactory, you
will have to remove the key solenoid rail assembly and place it back on the workbench in front of the keyframe‐with‐
keys to correct any misalignment.
Once you are sa sfied with these adjustments and the rail is properly aligned within the keybed slots, take a spring‐
loaded center punch or a sharp awl and carefully mark the centers of the four corner brackets, in the larger of the two
holes in each bracket.
Next, fasten the four alignment screws with the large washers. This will allow you to move the solenoid rail 1/4" in all
direc ons for fine alignment.
NOTE: The solenoid rail can be installed easily and more accurately when the piano is on its legs and the ac on is in
place. However, an assistant may be required to hold the rail while it is being fastened to the keybed for this step.
In the case of uneven keytails, a lost mo on adjustment can be made for each individual key. Each solenoid has a 5/8"
nylon cap at the bo om of the solenoid. With the 5/8" socket wrench turn the nylon cap clockwise to raise the plunger
p or counter clockwise to lower the plunger p.
Mount and Connect the Driver Boards
Now it is me to turn your a en on to the installa on of the five printed circuit
driver board chassis and note driver boards. There have been five Note Driver
Moun ng Brackets, 5 Lock washers & 5 Truss head screws provided in the kit.
These brackets are mounted in the center hole of each chassis. The lock wash‐
ers are to be placed between the Note Driver Moun ng Bracket and the Note
driver Chassis. The note driver board chassis will be mounted to the Key Sole‐
noid Locking nuts. Upon placement of each chassis be sure that all solenoid con‐
nectors will reach their respec ve header pins on the driver board.
Each 16‐note driver board has 16 pairs of header pins, one header pair for every
note. Start with the lowest key solenoid plug and plug it onto the lowest (that
is, the le most) header pair. The next key solenoid plug should be the opposite
wire color and it goes onto the next higher header pair. Con nue this process
for all 16 pair‐posi ons on each board (Note: if there is a single solenoid at a
break, there may be a wire color change.).
At this point, all boards have been mounted and connected to their respec ve key solenoid. Also, all electronic compo‐
nents, solenoid rail, and trap work have been mounted to the piano.
Mount toward the
back of the piano