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Thi* TROUBLESHOOT
INS
INFORMATION
i*
provided to help you
locate problem* that
M
y occur
if
th. unit
^ojT^
Howvvtr
,
this
IrforMtton
contain* general TROUBLESHOOTING
INFORMATION and
it la
NOT INTENDED
TO SOLVE
AU.
PROBLEMS.Ii
th.
unit la -till nut Functioning proparly aftar oaking th*
folio-
rk.rkt
.
then vou should take
the
unit to • OUALIFIED SERVICE
TECHNICIAN.
Ycxj
say want to refer the TROUBLESHOOTING CHART
that
begin* on Pag* 36 a* you r*»d through thi* auction.
You ah
Du
Id
alao read thla TROUBLESHOOTING INFORMATION thoroughly
before
proceading with any
of
tha chacka
involved.
ft
:
„yjBUAL-.EHEEH
Bef
ora turning tha DX7
"DN"
again, aaka
a
VISUAL CHECK
of
tha
l
tint
or
component*
that ar* ralatad
to any
amplification
of
the
unit.
Maka aura tha SPECIAL EDITION ROM haa baen lnaertad
proparly Into tha aockat and
that
no pin*
Df
th* ROM
hay* bean
bant undar.
Sometimes th* pin*
of
th* ROM can ba bant undarna.th
and
It
will be
difficult to detect thi* problem unlea* you remove
the ROM
to
examine
it.
ftlao.
If
the unit waa modifiad
from,
two
Syatem ROM **t-up
tD
a
aingl* Syatam ROM *#t-up, go back
and
verify each STEP
of
the modification procedur*.
For example,
make aure the two
IB
OHM RESISTORS between IC3B and IC27 have
baen moved and aoldered in the proper location*.
Make
aura
that
IC30 waa
removed and that the circuit pad* where
IC30 wa* removed
have been reaoldered to inaur* proper connection*
of
eny
feed-through
path*.
If
none
of
thaae Viaual Check* result in
fixing the problem then refer to th# SYMPTOM AND PROBABLE
CAUSE
fttrtlDn.
SYHPTQH AND
PROBAJgkE
J&USE.
U*ing the TROUBLESHOOTING CHART, qo through the following
checks
in order
to establish
end correct the problem that the
unit 1. exhibiting.
Make aure that th. 0X7
AC
cord
la
pluOO-d
into
en
AC outlet then turn
"ON* the DX7
end refer
to
the DISPLAY
CHECK.
p-
THE DISPLAY CHECK
on
li
When you turn
•ON" the
DX7
«
doe* the Display come
•ON"?
If
the answer is NO and the Diaplay does NOT come "ON", check
to make
eure that the AC cord
of
the DX7
1>
etill plugged
in
and
the power switch ii "ON".
If there, la
etill no Diepley, you may
«ant to try another AC outlet.
However,
if
none
of
these things
remedy the problem there may
be a
bad power supply fuae
or
the
- 32
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