Yamaha SPX990 Service Manual page 20

SPX990
SPX990
TEST
r
LCD
DISPLAY
CHECK
Checks
the operation of the
LCD
display
The LCD
display
changes
to
the following.
The
marks
appear, and
the display blinks
three times.
DIAG, V1.0
TEST LCD
END
CHECKING
METHOD
Check by
sight
TEST
2.
LED LIGHTING
CHECK
Checks
to
see
that
all
of the
LEDs
light
(1)
The
memory
LEDs
light in
the order of
00,
11,
22
(2)
PRESET, USER, CARD, STEREO,
MONO
and MIDI
light
in
succession
(3)
The LEDs
Inside
the keys
light
in
succession.
(4)
Ail
LEDs
light
{Except
for the
level
meter LED)
(5)
The LEDs go
out,
and
the
memory
LED
displays 2
and
stops.
CHECKING
METHOD
Check by sight
TEST
3.
SWITCH OPERATION CHECK
Checks whether
or
not
normal
receiving
is
obtained
by
pressing the
KEY PAD
switch
(1
)
The
following display
appears on
the LCD.
diagTWo
TEST SWITCH
SI
{2)
When
the
first
key on
the
left
below
the
LCD
is
pressed, the blinking "SI"
becomes
"S2".
(3)
When
the
second key from
the
left
below
the
LCD
is
pressed, the blinking "S2"
becomes
"S3".
Thereafter,
in
the
same
way,
if
the
third,
fourth,
fifth
and
sixth
keys,
and
the
PAGE
f
,
PAGE
i
,
MEMORY,
STORE, EDIT
AND
BYPASS
keys
are
pressed
in
succession and they are
OK,
the following display
appears,
TEST SWITCH OK
When
a
mistake has
been
made
in
the pressing order,
the display
will
stand by
in
its
present
mode
until
the
correct
key
is
pressed
Press the
BYPASS
key
if
would
like
to quit
during the
test.
TEST
4.
REAR FOOT SWITCH CHECK
Checks
to
see
that the
REAR FOOT
switch
is
operating normally
(1)
The
following display
appears on
the
LCD
DIAG.
V1.0
TEST REAR
SW
TG
(2)
"TG"
is
blinking,
so
when
the
FOOT
switch which
is
connected
to
the
TRIGGER
jack
is
turned
on,
"BP" begins
to blink.
When
the
FOOT
switch
which
is
connected
to
the
BYPASS
jack
is
turned
on, the following display appears
DIAG,
V1.0
TEST REAR
SW
OK
TEST
5.
RAM
CARD CHECK
Checks
to
see that the
exchange
of
data with the card
is
correct
Check according
to
the following
procedures
(1)
When
it
is
possible to write to
and read
from
the
card,
the following display
appears
DIAG. VI
0
TEST
CARD
W/R
(2)
Remove
the card
If
OK, the following display
appears.
DIAG.
vro
TEST
CARD
NON
{3)
Turn
the
card's protect switch on,
and
insert
the
card
once more.
If
OK,
the
following display
appears.
DIAG, VI
.0
TEST
CARD
PRO
When
a
procedural
error
has been made,
the
result
will
be "NG," so
you
will
need
to restart
and do
it
over
again.
Also,
when
writing to
and reading
from the card
is
not possible
in
step
{1),
the following display appears
on
the LCD,
DIAG.
VI 0
TEST
CARD NG
27