Front Panel Controls And Indicators - Crown I-T4000 Operation Manual

3 Operation
3.4 Front Panel Controls
and Indicators
A. Cooling Vents
Front-to-rear forced airflow through foam dust filter.
LCD Control Screen and Controls
B. LCD Control Screen
Integrated LCD with white backlight, controls ampli-
fier setup and operation.
The LCD Control Screen and its controls let the user
adjust the amplifier's attenuation and muting, con-
figure the amp, set up and view error monitoring
(such as temperature and load supervision), and
recall DSP presets. The presets allow the user to
quickly reconfigure the amp for various applica-
tions.
C. Level Controls (Encoders)
Speed-sensitive, 0.5 dB steps, range 0 to –90 dB.
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These two knobs affect the Channel-1 and
Channel-2 output levels. They also select Menu
items and adjust parameter values that are displayed
on the LCD control screen.
D. Menu/Exit Button
"Menu" enters the main menu. "Exit" leaves the
menu.
E. Prev Button
Selects the previous item in the menu.
F. Next Button
Selects the next item in the menu.
Thermal and Fault Indicators
G. 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.
Figure 3.1 Front Panel Controls and Indicators
H. Fault Indicator
Red LED, one per channel, flashes when the ampli-
fier output channel has stopped operating. Usually
this means that the amplifier must be serviced.
I. 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 dur-
ing Thermal Level Control (TLC) limiting.
Signal Indicators
Three green LEDS per channel indicate the ampli-
fier's input and output signal levels. From top to bot-
tom the LEDs are:
J. –10 dB: amplifier output is 10 dB below clipping.
K. –20 dB: amplifier output is 20 dB below clipping.
L. Signal: input signal is above –40 dBu.
M. Ready Indicator
Green LED, one per channel, illuminates when the
I-Tech Series Power Amplifiers
channel is initialized and ready to produce audio
output. Indicator is off when the channel is set to
standby mode via the IQ system.
N. Power Indicator
Blue LED indicates amplifier has been turned on and
AC power is available. The LED will flash when the
AC line voltage is 15% above or below the nominal
rated range.
O. Bridge Mode Indicator
Yellow LED illuminates when the amplifier is set to
Bridge-Mono mode.
P. Data Indicator
Yellow LED indicates IQ Network data activity. Data
indicator flashes only when the amplifier is polled
for data, or is polled to see whether it is online.
Q. Power Switch
Push-on/push-off switch glows green when AC
power is present at the power cord and the amplifier
circuit breaker is in the "on" position.
Operation Manual