n»7 special EDITIO
N
ROM
TNSTRIQMJN
BUIP£
EDITION ROM require.
a
particular
l.v.l
of
gii
or
make
a
copy
of
the Voices befors installing ths
ROM.
Also,
if
you find that your DX7 ham 2 SYSTEM
RDM
1C»
lidentifled by
XC
damlgnationm
ICI4 l 1CIS
"
board
>
than your unit naadm furthar •edification bsf
ore
jntttl
ling
the SPECIAL EDITION
ROM.
This •odi
f i
cation
will allow
leZ Vo
u«
a
single RDM
IC
in.ta.d
of
2
RDM
1
C.
-nd it^i. only
necessary
for a
faw vary marly production
R^alm.
In
*l«omt
all
camae this modification
will not
ba nacammary.
Sarial numb
ar
a of
^pUcl^
DX7 unit. ar. giv.n
in
APPENDIX
A,
how.
var.
omasum
t.
m.v hava alraady baan modified.
When you gain accamm tD the
Tntarn^
circuitry
of
the DX7, you will ba able to v.r
*«*•*•*£'
Dr
not you need to hava thta modification dona.
If
your
wit
hi*
only ona ROM
1C,
which
is
insertad into tha IC14 sockat, and
IC15
is NOT
present than tha modification
ia
NOT necessary
Clnot
words,
NO
IC1S
- NO MODIFICATION).
If
there are two ROM
ICs,
on.
in
tha
1C
1
4
sockat and ona
in the
IC15 sockat
ln
th
_
modification
Is required.
If
you
do not
have experience
In th.
area
of
soldering and handling electronic components
then this
modification
and the SPECIAL
EDITION ROM installation shou
d
be
performed by
a
Qualified Service Technician.
Once
again,
if
your
unit requires this modification REFER TO
APPENDIX
A,
Pag.
29.
In
order to prepare th- DX7 for the SPECIAL EDITION
ROM
installation, the
only tools you
will
head
are,
(DA
PHILLIPS TYPE SCREW DRIVER
..and...
(2)
A
SMALL FLAT-BLADE SCREW
DRIVER.
If
your DX7 naads furthar modification as
previously
mentioned, you will read additional tool,
and
thay
ar.,
11)
A
SOLDERING
IRON
12)
A
SOLDER VACUUM
OR SOLDER WICK
C3)
SOLDER
•
.and.
a
C4>
NEEDLE-NOBE
PLIERS.
Aft-r obtaining th. proper tool, and p.rf
orming.nyoth.r
modification preparations, you can
than
proceed with the SPECIAL
EDITION RDM installation by following the STEPS
given
belowi
11
)
In
order to avoid th. possibility
of
electrical shock
and any accidental damage to the unit,
make sure that
"
4 -
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