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JUL. 1986
(1)
TUNE DATA
( 1
)
A
tuning data updated
by
TUNE
button and
the alpha
TUNE
4^'
^
y
i:
0^
^
—
^'y
dial
is
stored
into
the
backed up
RAM
(IC26)
on
CPU-A
board.
The
setting
is
non-volatile,
that
is, it is
retained
in
—
CPU—
ASI^CD
RAM
I
C
2
65Cs5'fi:^ TL^
memory
even
after
the unit
is
turned
off.
RiD-IOOO
With
Ver.
1.3
On
power-up
the tuning data
is
not
transferred
from
the
RAM
to
CPU-B
board
which
controls voice
reproduction
including
pitch, resulting
in
the following
phenomena
to
appear.
1
.
The
pitch of
the
A
above middle
C
is
442Hz when
the
unit
is
switched
on
—
regardless
of
the
previous
tuning.
2.
Pressing
TUNE
will
display
the previous
pitch,
e.g.
438.0Hz.
3.
Rotating the alpha
dial will
cause
the pitch to
jump
from
442Hz
(on the
A)
to
438.0Hz
+
a Hz
(pro-
portional to the
dial
turning).
Ver.
-y
^
T
-yy°^
nr
o
§
f-
^
^
y
^ u.
S
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^
^
-
y r'M
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b
T
i
^
^
ti-b
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1.
h°-;;
^(d:A4
=4
4 2.0
Hz
2.
TUNE
y
AA
y
AyT
(d:iU0cDi^^{ii
im-
4 3
8.0
Hz
)
3.
a
T
CCD|aS{jtA7
AT T
A
^
-
y
Ax
-
^
CPU-B
$n^
C-;/
A«
4 4 2
HzA^C®(ji(
fij.
4 3 8.0
Hz
yf-f^o
With
Ver.
1.4
The
RAM-stored
tuning data
is
delivered to the
CPU-B
board
upon
power-up.
The
modules
are
ready
to
sound
at
the pitch
set
before the previous
power
off
—
no
descrepancy between
the display reading
(TUNE
pres-
sed)
and
the
actual pitch.
(2)
KEYBOARD
SWITCH
For
more
positive
contact
of
the
keyboard
switch,
change
its
contact
combination
as
shown
in
the
table
above.
Sensitivity
to
a
key touch
differs
between
the
two
types.
This
leads
to
a
revision
of
ROM
A
to
change
key
touch
response of the
subsequent
stages.
When
a
key(s)
needs
replacing, replace
a
group(s) of
switches with
a
keyboard
matrix
board(s)
having the
new
type
switches.
Exchanging
old
type
switches with the
new
ones
requires
ROM
A
of Ver.
2.1
or up.
When
ordering, specify
whether
the
existing
switches
are
old type
by
giving
the
serial
number
of
the
RD-1000.
Also
refer
to
KEYBOARD
PARTS
LIST
on
page 4
for
the Matrix Board
part
numbers.
BATTERY BACKUP
CIRCUIT
EFFSN
660855-671199
Add
a
current
limiting resistor
10K ohms
(R69)
in
the
battery
backup
circuit
on
the
CPU-A
board
—
between
the
battery
and
D6
anode.
Ver.
1
A
^
-
y
Ax
-
^
CPU-B
-5
®
xA
^
A
y
T
Aa:
t
®
A
b
A
o
y.4
-7
A
y
AtMl^A®
f:
Mo
A
-
^
7
A
{C
^
ROM A®7"d
A7
A
(
A-^
h
y
)o
7
ij
7. h
#Mo
ROM
-A
3
y
2.1
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it^^bTT^Ao
/\
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T^)
'
n
-j
OT
"j
7°Ii]S§
HSS^S6G0855-G71199
CPU-
yr
y 7°0g§®zs'.;;
X
IJ
b
D
6
P^(C
m-MJPMKR
6 9,
1
0
KAjIiDo
EFFSN
6841200-UP
Change
R69
from
10K ohms
to
1.5K
ohms
to
prevent
the
battery
backup
circuit
from
failing.
H]56i!^#8841200<t
U
R
6
9
A
1.5
RAM
I
C2
6
A'®
x -
^
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AA
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5
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