Crown MARCO-TECH 5000VZ User Manual page 20

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