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Crown MARCO-TECH 5000VZ - Page 20

Crown MARCO-TECH 5000VZ
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Notes
Error
Amp
The
Error
Amp (U
105)
input comes from
the
Variable Gain Stage with
or
wiíhout Loudspeaker Offset Integration
(LOI),
and is
summed
with
ampüfier
output
in a
negative
feedback (NFb) configuration. Output
of
the
Error
Amp
drives
the
Voltage
Translators
and
provides error signal
information.
An
error signal (spike)
is
produced
any
time
the
shape
of
the
output waveform
differs
from
the
output
of the
Variable Gain Stage
and LOI by
more than 0.05%.
This
error signal drives
the
error
signal
(ES)
input
to the
P.I.P.
connector,
the
error signal sense test
point,
and
the
compression
control circuií.
Error
Amp. Amplifier feedback
¡s
summed with
input
audio
and
fixes
gain from
the
input
to
this
stage
to the
output
of the
amplifier
at
26dB
(a
factor
of
approxímately
20).
From
LOI
To
Ch 2
for
Parallel
Mono
Compressor
The
compression
circuitry
senses error signal
and BGS
level.
If
the
BGS
overloads,
or an
error
signal
is
present,
the
compression
control
circuit
(U101)
produces
a
compression drive pulse.
A
switch
on the
rear
panel selects speed
of the
¡ntegrator circuit
to
follow,
and
may
shut
off
the
compressor
all
together.
The
compression drive pulse
also
drives
the IOC
Integrator
(U
102).
The
IOC
integrator
not
only
tells
the IOC
18-MA-5000VZ

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