Troubleshooting
Main
Troubleshooting
1. Run
the
instrument
self
test.
a.
Press
the
4
SPCL
5
key
.
b.
Press
4
5
5
on
the
numeric
keypad.
c.
T
erminate
the
entry
by
pressing
4
Hz
5
(ENTER)
When
4
SPCL
5
,
4
5
5
,
4
Hz
5
(ENTER)
is
pressed,
the
text
SELF
TEST?,
PRESS
ENTER
will
be
shown
on
the
synthesizer
display
.
Pressing
4
Hz
5
(ENTER)
will
then
cause
all
self
test
segments
to
be
run.
Pressing
any
key
other
than
4
Hz
5
will
cause
the
self
test
not
to
run.
As
the
self
test
is
running,
the
messages
PRESETTING
INSTRUMENT
and
SELF TESTING!
will
appear
on
the
display
.
If
the
self
test
does
not
detect a
failure,
the message
Self Test
passed
will
appear
on
the
display
.
If
the
self
test
does
detect
a
failure,
the display
will show
numbers in
the
form
\X
=
Y"
momentarily
,
and
then
the
self
test
will stop
.At
this point,
the
MSG
LED
will
be
lit.
Press
the
4
MSG
5
key
,
and
a
message
will
be displayed
in the
form of
\40XX". \40"
represents
the
self
test,
and
\XX"
represents
the
failed
group
. Rerun
the self
test.
As
you
monitor
the
display
,
be
prepared
to
write
down
the
error
code
\X
=
Y",
as
this
will
be
used
for
troubleshooting
purposes.
\X" references
atest
group
.
Each
test
within
a
test
group
is
given
a
unique number
. \Y"
is the
hexadecimal sum
of
all
test
numbers
within
a
test
group
that
failed.
The self
test aborts
upon completion
of a
test
group
that
reports
test
failures
.
If
no
failure
is detected,
go to
the
procedure
entitled
\Symptom
Troubleshooting"
to
continue
.
If
a failure
is detected,
continue
with
the
next
step
.
2.
Decode
the
numerical
self
test
result
to
determine
the
component
error
messages
indicated
by
the
result.
Note
It is
not
necessary
to
decode
the
error
messages
if
doing
so
provides
no
further
information.
F
or
example
,
if
multiple
errors
in
error
group
8
are
decoded,
the
resultant
error
text
for
all
error
numbers
would
be
identical
(\Data
Readback
from
LO
Assembly").
a.
Search through
the tables
titled \Error
Groups
Covered"
that
are
at
the
beginning
of
the
procedures on
the following
pages to
nd
the
rst
number
of
the
error
display
(\X"
in
\X
=
Y").
F
or
example
,
if
22
=
fc
is
displayed
as
the
result
of
running
the
self
test,
search through
the
tables in
the following
procedures
and
nd
the
error
messages
that
begin
with
22.
b.
If
the
second
number
of
the
error
display
matches
any
of
the
error
numbers
in
the
error
lists included in the procedure
, that is the only error message reported. If the second
number does not
match, it must be decoded.
c. T
o decode
the error display
, nd the number in the list of error messages that is the
largest number that can be
subtracted from the displayed number and subtract it. F
or
example,if22=fc
is displayed, subtract 80 from fc (80 is the largest hexadecimal
number from the list of \22
= Y" errors that can be subtracted from fc). One of the
errors is 22 = 80 and the result of the subtraction leaves 7c
.
d. Continue this subtraction process until the result is zero
.F
or example
, the result
22 = fc
,
when fully decoded, will yield 22 = 80, 22 = 40, 22 = 20, 22 = 10, 22 = 8, and 22 = 4.
If the message returned was 36 = 550, 550 would have to be decoded in order to
determine the failure conditions.To decode 36 = 550, review the list of codes for table
36. Find the largest number from the list that can be subtracted from 550. In table 36,
this number would be 400. 36 = 400 is one of the tests that failed. Take the remainder
from the rst subtraction and once again subtract the largest number from the list that is
Troubleshooting 1-7
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