QRS Music Technologies PMII Installation Manual - Installa On Procedure
Installa on Procedure
24
July 2013
...Installing the Universal Sostenuto Assembly...
Install the push lever which consists of the Push Block, the Main Sha , the Sha Bearings and the Swing Arm.
Determine placement of the push lever by first installing the pedal lyre on the piano. Place the push lever so that
the end of the lyre’s Sostenuto rod is on the outer edge of the push block when the pedal is not depressed. Make
sure that there is clearance as the push block travels through its arc as the pedal is depressed. The push block posi‐
on is adjustable by loosening the set‐screw. There are several indents in the sha for posi oning. Also note the
posi on of the sha bearing and bushing has been placed as close to the bend in the sha as possible to prevent
the bushing from working its way out during opera on. Only this sha bearing should be fastened in place at this
me. It is OK for the sha bearings to slightly overhang the slot.
The assembly may need inset into the keybed to accommodate the key solenoid rail and rail cover.
Insert the second Sha Bearing and the Swing Arm to the Main Sha . Screw the first lock‐nut onto the thread‐rod
and then a washer. Push the thread‐rod through the oval hole in the Swing Arm and then add the second washer
and lock‐nut. Do not ghten the lock nuts.
Center the thread rod/Swing Lever assembly in the slot being mindful of where the piano keys and solenoid rail
will be located. The Sostenuto parts can touch neither when the installa on is completed. Once the ac vator as‐
sembly is centered properly you can screw the second sha bearing in place.
Push Block & Felt Pad
Shaft Bushing
Shaft Bearings
Main Shaft
“L” Shaped Thread-Rod
Swing Arm
Lock Nut
Washer
Swing Arm
Washer
Lock Nut