U707B
LM339
Notes
DISPLAY
Amplifierfront
panel indication
includes
a
total
of 7
LED's.
These
include
Enable,
ODER,
SPI/IOC,
and
ILOAD/ILIMIT.
The
Enable indicator
is an
amber
light
which indicates presence
of the
low
voltage supply.
It
is
powered
by the
unregulated +24VDC supply.
It
will
be on any
time
the
power switch
is
depressed
(unless
the low
voltage
fuse
blows).
ODER
indicators provide
an
on-line
indication
of
amplifier thermal
reserve.
The
LED's
are
amber (although they
may
have
a
reddish
appearance)
and are
normally
on.
They
dim
and/or
extinguish
in the
eventthattheamplifier'sthermal
reserve
¡sexhausted.
ODER
indicators
will also extinguish whenever
the
main
supply relays
are
open (such
as
a
protection action being activated,
or
during
Soft-start
time-out).
Green
SPI/IOC
LED's show signal presence
(SPl)
and any
form
of
distortion
(IOC)
They flash
dimlywith
the
audioto
show signal.
Inthe
event
of an
IOC
condition (output waveform
differs
from
input
by
>0.05%)
the
light
will
be on
brightly.
An
occasional flash
of !OC
usually
indicates
clipping.
If
the IOC
light
locks
in it
usually
¡ndicates
a
protective
action,
including
ODER
limiting.
MA-5000VZ
- 29
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