YORKVILLE PSA1S Manuel De Service page 48

PSA1s Service Bulletin: Limiter Update
There is a simple change that can be implemented in any PSA1s having a serial
number beginning with a 1. This bulletin will illustrate how to easily make this
change, which will lead to greater long-term reliability and which will also improve
the sound of the PSA1s when the inputs are excessively overdriven.
1. Lay down the PSA1s with the
grille-side down.
2. Remove the 18 black bolts that
are along the perimeter of the
metal chassis on the back.
3. To remove the chassis, use a
flathead screwdriver (or other
similar prying device) and pry up
the chassis from the side with the
XLR jacks.
4. Carefully tilt up the side of the
chassis you've lifted, raising it
about four or five inches. If you
look beneath the chassis, you'll
see two pairs of black and red
twisted wires running into the
cabinet.
5. At the end of these wires is a
locking header. If you pinch the
clip on the header it will unlock
and the wires can be easily
disconnected from the amplifier
boards.
6. After the wires are disconnected,
you can remove the chassis from
the box and set it on your work
surface.