Roland HP 2700 - Parameter Address Map

HP-3700/2700
ADJUSTMENT
An ADC
adjustment
is
provided on the HP- 2700 and
HP-2700>
HP-3700
SmSpird:
LT
0
HP- 3700.
Perform
this
adjustment in the following
situations.
(1)
When
you have exchanged ICs.
(2)
If
as
the
sound decays,
noise is
heard immediately
before
the
sound disappears.
There
are
two ways to make adjustments
;
while watching
the
waveform on
an oscilloscope,
and aurally
while
listening
to the
sound.
(I).
Making adjustments while
watching
the
oscilloscope
waveform
1.
In
test mode, select test
item
1.
(For
the procedure,
refer to
the
Test Mode page.)
2.
Make
panel settings
as follows.
VOLUME
:
MAX
BRILLIANCE
: CENTER
3.
Connect the test point TP2
or TP3 on the
jack
board
to
the oscilloscope, and
make the
following settings.
5
mV/div
2 mS/div
4.
Rotate
the
potentiometer VR1
on the jack board
so
that
the
waveform is as shown below.
(I)
1.
-f
X
h
•
VOLUME :
MAX
BRILLIANCE
: Center
3.
JACK.-Jt'-
K±®xX
h
•
-tt'O
t'TP2*^TP3iC;l->X
5
mV
/
div.
2
mS/div.
4. JACK4<'- K±®¥@^dOJ
^-AVRl^lHlL-r.
MW
TH®
J;
0 9
9.2
mS
incorrect
CORRECT
/ISS
INCORRECT/^liH
Dec.
1990
(n)Making
adjustments
while listening to the
sound
1. Turn
the
power
on, and
make
the following panel
settings.
VOLUME
MAX
BRILLIANCE
BRIGHT
E.PIANO
ON
CHORUS
OFF
TREMOLO
OFF
REVERB
OFF
2.
Softly
play
any
key
in
the
octave
above
the
middle
of
the
keyboard.
3.
While
listening
to
the
sound from
the
speaker,
adjust
the
potentiometer
(VRl)
on
the
jack board.
Rotate
VR1
so
that
the
sound
is the
clearest
(i.e., so
that
high
frequency
elements
are
minimized,
and the
sound
is
close
to a
sine
wave).
NOTE
:
In
the
case
of
the HP-
2700,
you
can
rotate
VR1
directly
from
the
jack
board.
In
the
case
of the
HP-
3700,
there is
a
hole in
the jack
board
under
VRl,
allowing
you to
insert
a
minus
screwdriver
from
the
solder
side to
make
adjustments.
(n)
VOLUME : MAX
BRILLIANCE : BRIGHT
E.PIANO
: ON
CHORUS :
OFF
TREMOLO
:
OFF
REVERB
:
OFF
<3i<o
3.
JACK
A-
K±®it^ll
(VRl)
VRl
LTAt,
C
A ^ i
C
-5
;±
: HP-2700
®Ji^t4. JACKd^-
K®±;i'b'E®i S
VRl
^
Hlf
HP-3700
®Ii^(4, JACKd^'-
K®VRl®T#ltdA4i<PI>.'
lAAPSI-r-Bo
(OUTPUT
R)
TP1
(GND)
(OUTPUT
L)
30