Audio Mute Select
The audio output from the Channel board
to
the Audio board can
be
enabled or disabled by a relay which ·resides
on
the Channel board.
f
After selecting the Channel test, the diagnostic will ask?
MUTE
AUDIO OUTPUT?
If you press the YES switch the relay will be closed, disabling
the audio output. If you press the
NO
switch the relay will be open,
enabling the audio output.
NOTE:
the audio mute relay will not be opened or closed until
the
channels have been selected (test begins).
Sinewave Select
One
of three sinewaves stored
in
Sound File
ROM
may be
selected. The sinewaves will be output to the selected channels
continuously
to provide oscilloscope signals. These sinewaves
correspond
to
the keys
on
the keyboard and are therefore named
accordingly. The sinewave names are:
C2
SINEWAVE sampled at 5
KHZ
rate,
frequency
65
HZ
C5
SINEWAVE sampled at
10
KHZ
rate, frequency
523
HZ
C8
SINEWAVE sampled at
15
KHZ
rate,
frequency 4186
HZ
By
selecting one of the three sinewaves, and selecting the
same
sampling rate as
that
used
for
originally
storing the
sinewaves, the frequency
will be the same
as
that shown above. The
diagnostic
will ask:
C2
SINEWAVE? if
you
press the
NO
switch then it asks
C5
SINEWAVE? if
you
press the
NO
switch then it asks
C8
SINEWAVE? if
you
press
the
NO
switch the questions
are asked again. This
will continue until you press the YES
switch
for one of the choices.
Kurzwell 250 Service Manual, Chapter 4
4 - 6 1
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