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.
After selecting the Channel test, the r 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
SINEW AVE 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
SINEW AVE? 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
4·23
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