Front Panel Controls And Indicators - Crown CTs 1200 Operation Manual

4 Operation
4.2 Front Panel Controls
and Indicators
A. Fault Indicator
Red LED, one per channel, fl ashes when
the amplifi er output channel has stopped
operating. Usually this means that the
amplifi er must be serviced.
B. Thermal Indicator
Red LED, one per channel, illuminates
when the channel has shut down, or is very
near shutting down, due to thermal stress
or overload.
C. Ready Indicator
Green LED, one per channel, illuminates
when the channel is initialized and ready to
produce audio output. Indicator is off when
the channel is set to standby mode via the
System Architect or IQ Control Software
packages.
page 16
Signal Indicators
Three green LEDS per channel indicate the
amplifi er's input and output signal levels.
From bottom to top the LEDs are:
D. Signal: input signal is above –40 dBu.
E. –20 dB: amplifi er output is within 20 dB of
clipping.
F. –10 dB: amplifi er output is within 10 dB of
clipping.
G. Clip Indicator
Red LED, one per channel, illuminates
when the channel's output signal reaches
the onset of audible clipping. The Clip
Indicator also will illuminate during
Ther mal Level Control (TLC) limiting or
when the input compressor/limiter is
protecting the amplifi er from input
overload.
H. Cooling Vents
Front-to-rear forced airfl ow.
Figure 4.1 CTs 600 front panel.
CTs Power Amplifi ers
I. Power Indicator
Blue LED indicates AC power has been
applied and is within the safe operating
range of the power supply. The LED will
fl ash when the AC line voltage is
approxi mately 15% above or 25% below
the nom inal rated value.
J. Data Indicator
Yellow LED indicates control activity This
LED is driven by the IQ-PIP2 module via
the PIP2 interface. Note: Data indicator
fl ashes only when the installed PIP module
is polled for data, or is polled to see
whether it is online.
K. Bridge Mode Indicator
Yellow LED illuminates when the rear-
panel Mode Switch is set to the "Bridge"
position
L. Power Switch
Push-on / push-off switch.
Operation Manual