The "switch matrix" contains 55 pushbutton switches, used to
enter numbers and predefined commands into the machine.
Of these
switches, 38 contain
"light emitting diodes" (LED's) which form the
"lamp array". These lamps are lit for various purposes such as a
confirmation of actions or
an
indication of nexf possible actions.
The Control Panel board receives power and signals from the
CPU
through its connector. Power comes in on multiple wires to
allow more current to
flow. This also provides redundant contacts,
increasing reliability. Most
signals have either power or ground
lines between them to reduce crosstalk.
Slider
Board
The Slider. board contains seven slide potentiometers which
affect
the
instrument's
tuning and
other
characteristics.
It
conditions and passes on signals from two "special-effects" levers,
the two piano-type foot pedals
in
the POD, and two (optional) special
effects pedals that plug into the back panel.
The
Slider board provides analog signals:
1.
to the Control Panel board for control of playing parameters
(pitch, vibrato, etc.)
2. for the audio mixer on the Channel board, for controlling the
audio output (loudness and balance)
3. for the two pots used
to
trim the Mod Lever
The
Slider board is mounted
on
the left (bass) side of the front
panel.
It connects to three places:
1.
through P51, carrying power from the signals to the Channel
board
2. through
P50 delivering power and signals to the Front
Panel
3.
through
P41
from the
Mod
Levers
Kurzwell
250
Service Manual, Chapter 3
3-
36
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