The next
CPU
test is the keyboard
interfac~
test.
TEST
KEYBOARD? Press
YES
KEYBOARD TEST
PRESS
ANY KEY
The first key
on
the left is numbered zero. The last key
on
the
right is numbered 87. The keyboard is divided into two keyswitch
boards. The
left half
of
the keyboard contains keys 0 through 43.
The right
half
of
the keyboard contains keys 44 through 87. The
keyboard
split occurs between E4 and
F4
in
the center of the
keyboard.
Pressing and
holding down the
E4
key
on
the keyboard will NOT
sound
an
audible note, but will cause the front panel
LCD
to show:
EXAMPLE:
ATTACK
TOF:
FO
KEV43
COUNT:
1
. Releasing the
E4
key will cause the front panel display
to
show:
RELEASE
TOF:
93
KEY:
43
COUNT: 2
NOTE:
The
Time-Of-Flight
(TOF)
indicated
will vary
depending upon how fast the key is pressed or
released. A fast
key stroke will show a
larger number (hexadecimal). A very
slow key stroke will show 00 for the Time-Of-Flight. The key
number and count are
in
decimal. The count should always
be
even when
no
keys are pressed down.
Press SELECT
to
exit the keyboard test.
The next four tests require the
loopback connectors provided
with the Diagnostic
~it.
TEST MIDI? Press
YES
Kurzwell 250 Service Manual, Chapter 4
4·
1 6
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