P N O s c a n
P N O s c a n
P N O s c a n
I I
I I
I I
I n s t a l l a t i o n M a n u a l
I n s t a l l a t i o n M a n u a l
I n s t a l l a t i o n M a n u a l
Manual Rev. 1.18
17
QRS Music Technologies, Inc. / Technical Support - 800-247-6557 / www.qrsmusic.com
This circuit board has two functions. It actually contains the sensors that read the soft shift movement of
the action and provides a single point for all cable connections.
1. Mount the Soft Pedal Circuit Board to the plastic Soft Pedal Chassis using the 4-24
X
3/16” screw.
See Figure 22
.
J ] Soft Pedal Circuit Board Installation
This is a good time to connect all cables to the soft pedal board. Making these connections prior to
mounting the soft pedal board makes cable connection easier.
2. From Figure 20, connect the 12" 6-pin cable [20” for Upright pianos] to the Key Scan port.
3. Connect a 20" 6-pin cable [60” for Upright pianos] to the Sust (Sustain) port.
4. Connect the 38” 10-pin (wide) cable to the IN port.
The working distance for the sensors on the Soft Pedal Circuit Board is about 1/2". In most cases you can
find a place on the side wall of the piano where the movement of the main action frame can be captured. A
grand key/action generally moves about 1/4" or less.
5. Put the action back into the piano.
6.
Locate a place to mount the Soft Pedal Chassis where it will face a flat area of the action frame.
See Figure 23A for Grand pianos and Figure 23B for Uprights.
Check that the return spring does not rub the Soft Pedal Chassis when the action is shifted.
You may need to add a block of wood to space the sensor out to achieve a distance of 1/2" to 5/8" with
the action in it's rest position.
The 10-pin (wide) cable from the “IN” port of the Soft Pedal Circuit Board MUST reach to the TUSB
box. There are NO extensions or longer 10-pin cables available.
Choose a location for the Soft Pedal Board so that the cables will reach to the TUSB Interface and
the Sustain Pedal Board. See sections K & L on the following pages.
7.
Once you have selected a location based on the said parameters, remove the action from the piano and
proceed to install the soft pedal assembly.
=
Figure 22
To the Key Scan Assembly
To the Sustain Pedal
Circuit Board.
Optical Sensors
To the TUSB box
Figure 23A
USB MINI B to USB Type A Cable
Flex Cable Coupler
Grand Piano Installation
