Yamaha SPX990 Service Manual page 21

SPX990
TEST
6.
ROTARY ENCODER CHECK
Checks
to
see
that correct rotary
encoder
data
is
being sent
{ 1
)
Rotate the
encoder one
revolution or
more
to
the
right (clockwise).
If
OK, the following display
appears
DiAG. V1.0
TESTR-ENC
R
OK
(2)
Rotate the
encoder one
revolution or
more
to the
left
(counterclockwise)
If
OK,
the following
display appears.
DIAG
V1.0
TESTR-ENC
OK
TEST
7.
MIDI
INPUT/OUTPUT CHECK
The
MIDI
IN
and MIDI
OUT
signal
systems
are
automatically checked.
Note: Set the
MIDI switch on
the
MIDI
OUT
side.
Connect MIDI
IN
and
MIDI
OUT
with
a
MIDI cable
(1)
When
OK, the following display appears
DIAG.
V1.0
TEST
MIDI
OK
(2)
When
the signals
which have been
output
to
MID!
OUT
do
not
return to
the
CPU
through MIDI
IN,
or
when
the signals return
but
are
not normal,
the following display appears.
DIAG
V1
0
TEST
MIDI
NG
TEST
a
USER
RAM
INITIAL
SETTINGS
Copies
the factory preset values
to
user
RAM
and
performs the other
initial
settings
( 1 )
The
following display appears
on
the
LCD-
DIAG
V1.0
RAM
INITIAL
?
(2)
Press the
STORE
key.
(3)
The
following display
appears on
the LCD,
and
initial
setting
is
completed.
DIAG. VI-0
RAM
INITIAL
OK
TEST
9
RETURN
FROM
TEST
PROGRAM
TO
NORMAL
OPERATION
Used
when
you have performed
the
checks
in test
1
through
8,
and you would
like
to return to
normal
operation.
If
the
checks
In test
1
through
8
have been performed,
It
will
return to normal
operation.
If
the checks have not been
completed,
"CHECK
NOT
END"
will
appear on
the
LCD
TEST
10.
PRE
DEQ CHECK
Generates
a sine
wave
from PRE
DEQ
(1C 19}
inside
the
AD
circuit
board,
and
determines whether
LSI
is
normal
(1)
A
sine
wave
of approximately 960
Hz,
+13
±
15
dBm
is
output
to the
OUTPUT
terminals
(L,R).
(2)
The
following display appears
on
the
LCD.
DIAG
V1..0
TEST
PRE
DEQ
TEST
11.
POS DEQ CHECK
Generates
a
sine
wave
from
POS DEQ
(IC17),
and
determines whether
LSI
is
normal
(1)
A
sine
wave
of
approximately 960
Hz,
+13
±1.5
dBm
is
output
to the
OUTPUT
terminals
(L,R).
(2)
The
following display appears on
the LCD.
DIAG.
V1.0
TEST POS
DEQ
TEST
12.
DSP2-LSI
CHECK
Generates
a
sine
wave
from DSP2, and
determines
whether
LSI
is
correct
(1)
A
sine
wave
of
approximately 960
Hz,
+13
±
1
5
dBm
is
output
to
the
OUTPUT
terminals
(L,R).
(2)
The
following display
appears on
the
LCD.
DIAG.
VI
0
TEST DSP2
TEST
13.
DSP2 TRIGGER CHECK
Checks
to
see
that the
output
of the
terminal
can be handled by
the
CPU
In this
way,
a
determination can be
whether
the threshold data during the
gate
system and
the
intelligent
system
by
the
CPU.
DSP2
TRGO
made
as to
effect
of the
can be
read
28
SPX990