Yamaha SPX990 Service Manual page 19

SPX990
PROGRAM
A test ITEMS
TEST
1:
LCD DISPLAY OPERATION
CHECK
TEST
2:
LED LIGHTING
CHECK
TEST
3:
SWITCH OPERATION CHECK
TEST
4:
REAR FOOT SWITCH CHECK
TEST
5:
RAM
CARD CHECK
TEST
6:
ROTARY ENCODER CHECK
TEST
7:
MIDI
INPUT/OUTPUT CHECK
TEST
8:
USER
RAM
INITIAL
SETTINGS
TEST
9:
RETURN FROM
TEST
PROGRAM
TO
NORMAL
OPERATION
TESTIO: PRE
DEQ CHECK
TESTll:
POS DEQ CHECK
TEST12: DSP2-LSI
CHECK
TEST13:
DSP2 TRIGGER
CHECK
TEST14:
D-RAM CHECK
TESTIS:
AD
CIRCUIT
BOARD CHECK
B.
PREPARATION
1
Connect
MIDI
IN
and
MIDI
OUT
with a MIDI
cable.
2.
Connect
the
FOOT
switch
to
the
TRIGGER
jack
and
the
BYPASS
jack.
3 Insert
YAMAHA
MCD32 (RAM
card 32K}
into
the
front
panel
slot,
Turn
the card's write protect switch
off.
C.
STARTING THE TEST
PROGRAM
While
pressing the
PAGE
t
key,
MEMORY
key
and
EDIT
key, turn
on the
POWER
switch
After starting
the
test
program, the
DEQ
and
DSP
circuits
output only
direct
signals to
OUTPUT
L,R.
When
the
test
program
is
started,
an
LSI control
circuit
check,
a
ROM
page
check,
and
a battery
check
are automatically
performed, and the
results are
displayed as follows
L
When
normal:
DIAG
VI 0
TEST
INITIAL
OK
2
When
the LSI control
circuit
is
faulty:
DIAG- V1.0
TESTACIA NG
3.
When
ROM
page
is
faulty:
DIAG
VI
0
TEST PAGE
NG
4.
When
battery
is
faulty:
DIAG
VI,
0
TEST BATTERY
NG
(The
S-RAM
check
is
performed
when
the
power
is
on
during
normal
operation.)
*
Display
when
faulty during
normal operation
In a
case
where
the
power
is
turned
on
during
normal operation,
when
the battery
is
not
in
the
battery socket or
when
the voltage
is
low, the
following display
appears
»«•****
WARNING
******
BATTERY ERROR
In
a
case
where
the
power has been
cut
during use
of the
RAM
card,
when
the card
is
removed and
power
is
supplied, the following display
appears
******
WARNING
******
NO RAM CARD
When
used
in a
condition
where
the battery voltage
has dropped,
the internal
RAM
data
will
be erased.
In
such
a
case,
one
of the following displays
will
appear.
******
WARNING
******
MEMORY
DATA ERROR
******
WARNING
******
MEMORY
NO.
ERROR
D.
PROCEEDING
THROUGH
THE TESTS
Through
the
PAGE
t
key
and
the
PAGE
1
key,
the
desired test
number
is
displayed on
the
memory
LED,
and
the
test
is
implemented by
pressing the
first
key
on
the
right
below
the
LCD.
When
Test 9
Is
implemented
after
Test
1
through
Test
8
have
all
been completed,
it
returns
to
normal
operation.
In
the case
where
the
checks through
Test
8
have not
been
completed,
"CHECK
NOT
END"
is
displayed
on
the LCD, Moreover,
when
Test 99
is
Implemented,
it
returns
to
normal
operation
even
when
there are
unimplemented
tests.
E.
"OK"
or
"NG"
RESPONSE
"OK"
or
"NG"
will
be displayed on
the
LCD
26
SPX990