Roland TR-909 - TR-909 System Block Diagram; Voicing Board Circuit Blocks; Control and Interface Board Connections; CPU and Power Supply Integration

RHYTHM COMPOSER
TAR-903
The Roland TR-909 rhythm composer is
a fully programmable rhythm machine
with various attractive functions.
Features
eBy using up to 48 kinds of Rhythm
Patterns, you can program 4 Rhythm
Tracks (altogether 896 measures) in a
Bank, and there are two separate Banks,
which doubles the capacity of the TR-
909.
e|t is possible to write accent data indi-
pendently to Bass Drum, Snare Drum,
Low, Mid, and Hi Toms and Closed Hi-
hat, as well as Total accent to all the
voices within each step.
eEach sound source includes Control
knobs of Level, Decay, Tune, etc, allow-
ing spontaneous timber setting accord-
ing to the tempo of the rhythm.
@Flam and Shuffle functions are featured
enabling richer expressing of rhythms.
eThe Tape Interface makes it possible to
save the programmed data in the TR-
909's Memory onto an ordinary audio
tape.
eThe Memory Cartridge is optional for
instantaneous saving and loading.
eThe Display Window allows quick visual
grasp of the tempo, measure number,
etc.
eMIDI BUS Interface on the back panel
enables setting up with other- MIDI
devices, therefore, external sound
source and Sync with external devices
are now available.
Important Notes
e
Using
the
TR-909
near
a
neon
or
fluorescent
lamp
may
cause
noise
interference.
If
so,
change
the
angle
or
posi-
tion
of
the
TR-909.
eAvoid
using
the
TR-909
in
extreme
heat
or
humidity
or
where
it
may
be
affected
by
dust.
e
Use
a
soft
cloth
and
clean
only
with
mild
detergent.
eDo
not
use
solvents
such
as
paint
thinner.
= Memory Back-up
The
TR-909
features
memory
back-up
system
that
retains
Rhythm
Patterns
and
Track
compositions
even
when
switched
off.
The
TR-909
relies
on
its
batteries
for
its
back-up
circuit.
Be
sure
to
keep
the
battery
securely
connected
even
while
using
the
AC
Adaptor.
Also,
al-
ways
replace
with
a
complete
set
of
the
new
batteries
once
a
year.
If
you
have
changed
the
batteries
with
the
TR-909
switched
on,
the
memory
can
retain
the
data.
eif
the
TR-909
is
not
to
be
used
for
long
periods
of
time,
please
be
sure
to
switch
the
power
off
and
re-
move
the
batteries,
or
various
troubles
may
be
caused
by battery leakage.
ePlease
observe
"Battery
Replacement"
on
the
next
page.
ePlease
be
sure
that
the
polarities
of
the
batteries
are
correct.
= Battery Replacement
Use two 1.5V (UM-3) batteries.
© Remove the battery cover оп the bottom of the unit.
© Take out the battery case.
©
Remove
the
batteries
from
the
battery
case.
€ Place a new set of batteries taking care of the polari-
ties.
© Return the battery case into the housing.
© Return the battery cover.
ePlease be sure to do the entire battery replacing pro-
cedure with the unit switched on. Then the data in
memory will be retained.
ePlease do not pull the cord hard.
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