Front Panel Controls And Indicators - Crown Macro-Tech 2402 Operation Manual

MA 2402 Power Amplifier
4 Operation
4.2 Front Panel Controls and
Indicators
The diagram below shows the controls and
indicators on the front panel of the Macro-Tech
2402.
A. Dust Filters
The dust filters remove large particles from the
air drawn in by the cooling fan. Check the filters
regularly to prevent clogging. The filter ele-
ments can be easily removed for cleaning by
gently pulling them away from the front panel.
B. Level Controls
The output level for each channel is set with
these convenient Level controls mounted on
the front panel. Each level control has 31
detents for precise adjustment. A security
option is available to prevent tampering (see
Section 5.3.3).
Operation Manual
®
C. Signal/IOC Indicators
These green multifunction indicators show sig-
nal presence and distortion for each channel.
As signal presence indicators, they flash syn-
chronously with the output audio signals to
show their presence. As IOC (Input/Output
Comparator) indicators, they flash brightly with
a 0.1 second hold delay if there is a difference
of 0.05% or more between the input and output
signal waveforms. This provides proof of dis-
tortion-free performance. Note: The Channel 2
IOC indicator stays on in Parallel-Mono mode
(see Section 3.6.3).
D. ODEP Indicators
During normal operation of the ODEP (Output
Device Emulation Protection) circuitry, these
amber indicators glow brightly to show the
presence of reserve thermal-dynamic energy.
Figure 4.1 Front Panel Controls & Indicators
They dim proportionally as energy reserves
decrease. In the rare event that energy reserves
are depleted, the indicators turn off and ODEP
proportionally limits output drive so the ampli-
fier can safely continue operating even under
severe conditions. These indicators can also
help identify more unusual operating condi-
tions (see Section 5.1.1).
E. Enable Indicator
This indicator lights when the amplifier has
been "enabled" or turned on, and AC power is
available.
F. Enable Switch
This push button is used to turn the amplifier
on and off. When turned on, the output is
muted for approximately four seconds to pro-
tect your system from start-up transients. (This
delay can be changed. Contact Crown's Techni-
cal Support Group for details.)
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