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NOTE
If
the
oscillator
is
switched
off
instead
of
faded
off, a
state
change
may
occur.
In
the instructions below,
always
"suppress" the
oscillator
by fading
it
quickly off instead
of
switching
it
off.
This
simulates
the
envelopes found
in
normal program
material.
Restore
the
oscillator.
d.
Now
start turning
the
panpot very
slowly
towards
center.
Observe
that as
you
do
so,
the
BYPASS
lamp
will
slowly fade
in.
When
this
happens,
stop.
Suppress
the
oscillator;
verify
no
change
of state;
restore
oscillator.
Continue
to
pan towards center
until
the
SYNTH
FROM
LEFT
lamp
comes
on
and
the
BYPASS
lamp
slowly fades
out.
Stop;
suppress
oscillator;
verify no
change
of state; restore
oscillator.
Continue
to
pan
away from
center towards
right.
Verify that the
BYPASS
lamp
fades
in
slowly,
and
that the
SYNTH FROM
LEFT
lamp
stays on
until
the
BYPASS
lamp
has
reached
full
brightness. Stop;
suppress
oscillator;
verify no
change
of state; restore
oscillator.
Continue
to
pan
right.
Verify
that
at
almost
full
right,
the
SYNTH
FROM
RIGHT
lamp
comes
on and
the
BYPASS
lamp
turns off quickly. Stop; suppress
oscillator;
verify
no
change
of state;
restore
oscillator.
e.
Set the rear-panel
RECOGNITION
switch
to
1CH ONLY.
Pan
full
left;
verify
that the
SYNTH
FROM
LEFT
lamp
comes
on
quickly.
Suppress
oscillator;
verify
no change
of state; restore
oscillator.
Pan
towards
center. Verify that the
BYPASS
lamp
comes
on
quickly
when
you
pan
slightly
off
full left.
Stop; suppress
oscillator;
verify
no
change
of state;
restore
oscillator.
Pan
through center
to
full
right.
Verify that
very
slightly
before
full
right
the
SYNTHESIZE
FROM
RIGHT
lamp comes
on
and
the
BYPASS
lamp
turns off
quickly. Stop;
suppress
oscillator;
verify
no change
of state.
4)
Optional
275A/RC Remote
Control Interface Tests
If
you have
not
installed
the optional
Orban
Remote
Control Panel
275A/RC,
then
these
tests are
not relevant
to
you.
However,
they are included
for
completeness.
Reposition
the 16-pin
DIP
plug
from
J5
to
J4
(on
the rear
of
the
main
circuit
board)
and
plug the
275A/RC Remote
Control Panel
into
its
rear-panel connector.
Press
all
buttons on the
Remote
Control,
and
verify that
the
lamps respond
as
they
would
if
the
unit
were
being controlled
from
the front panel.
If
you do
the
tests
below
to
verify
operation
of
the
User Control
Interface, leave
the
Remote
Control connected.
When
the
User
Control
Interface
tests
cause
the
5-6
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