Test Program (Y^hynyya) - Yamaha SPX50D Service Manual

SPX50D
SPX50D
TEST PROGRAM
• Test Program
Entry
(1)
While pressing the
"BYPASS"
and
"ME-
MORY
"
switches, turn the
POWER
sw-
itch
on.
The
Test
Program
will
be activated.
The message
will
appear
in
the
LCD
as
shown
below,
TEST ACIA
and
the
7-segments LED
will
indicate
"0"
The
ROM, RAM, DEO
and
DSP
checks
are
performed
automatically.
(2)
On
normal operation,
when
the
power
switch
is
turned on, the
ROM
and
RAM
checks
will
be performed automatically.
And
the
DEO, DSP
check
will
be
per-
formed
too.
(3)
The
test-number
will
be
indicated
in
the
7-segments LED.
Select
a
test-number
with following
operation.
First,
press the
"MEMORY"
switch.
Pressing the
"
t
"
switch
will
increase
the
test-number and
pressing the
"
i
"
sw-
itch will
decrease
it.
Press the
"RECALL"
switch
to
initiate
the
test.
(4)
When
the test
6
is
activated
after
com-
pletion of
the tests
1
through
5,
normal
operation
will
be
restored
.
When
the
test
100
is
activated,
normal operation
will
be restored regardless of the
completion
of the
tests.
1
.
TEST1
:
LCD
Check
(1)
Select the
test-number
"1",
and
press
the
"RECALL"
switch
to
initiate
the
test.
(2)
The
entire
LCD
is
turned
"ON
and
OFF"
five
times.
(3)
Verify
proper lighting
of
all
dots
in
the
LCD.
2.
TEST
2
-.LED
Check
(1)
Select the test-number
"2"
,
and
press
the
"RECALL"
switch to
initiate
the
test.
(2)
The 7-segments LED
will
indicate figures
of
"0"
to
"99"
in
sequence.
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•
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LED
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0|
(2)
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MEMORY
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[
RECALL]
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LED
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(1)
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.
TEST1
LCD
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^
(1)
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RECALL]
(2)
LCD
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lEyo
(3)
LCD
gtlC:
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2
.
TEST2 LED
(1)
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RECALL]
(2)
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MEMORY
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PARAMETER
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4-
19