Crown I-T12000 HD, Руководство по эксплуатации

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Operation Manual
I-Tech HD Series Power Amplifiers
page 38
I-Tech HD Series Power Amplifiers
Operation Manual page 39
Maximum analog
input
Low +21 dBu (0 dB)
High +15 dBu (+6 dB)
Analog
input
AES
input
Cobranet
input
Analog
input
sensitivity
Source
select
AES input trim
Cobranet input trim
Output
attenuator
Fixed
gain
compensation
Limiters Amplifier
Low +21 26/32 dB
Hi +15 32/38 dB
Fixed gain
4 Advanced Operation
Figure 4.4 The Various Gain Settings in the I-Tech HD
4.8.19 Fixed-Gain Mode in the I-Tech HD
Fixed-gain mode makes any I-Tech HD model have the same gain, regardless
of output power.
To do that, fixed-gain mode sets the Analog Input Sensitivity to 0 dB gain,
then adjusts the Fixed gain Compensation fader, and the Maximum
Analog Input , to achieve 26 or 32 dB of gain (if the Maximum Analog Input
is set Low), or to achieve 32 or 38 dB of gain (if the Maximum Analog Input
is set High), no matter what model the amplifier is.
However, In fixed-gain mode, the input trims (Analog, AES, CobraNet) can
still be adjusted.
5 Troubleshooting
“Off/Flashing/On” means that the
LED can be off, or flashing, or on.
CONDITION: Power indicator is
off
and power switch is not illu­
minated.
POSSIBLE REASON:
• The amplifier has lost AC power.
• The amplifier is not plugged into the
power receptacle.
• Rear-panel breaker is off.
CONDITION: Power indicator
is off
and power switch is illu­
minated.
POSSIBLE REASON:
• The amplifier’s power switch is off.
CONDITION: Power indicator is
flashing.
POSSIBLE REASON
• The AC line voltage has dropped below
15% or has risen above 15% of the
rated range.
CONDITION: Thermal indicator is
on.
POSSIBLE REASON:
• The amplifier is becoming too hot for safe
operation. Allow amplifier to cool. Check for
loads less than 2 ohms, and for excessive
input levels. Check for proper ventilation.
CONDITION: Fault indicator is
flashing.
POSSIBLE REASON:
• The amplifier channel has stopped
operating. Refer the unit to an authorized
Crown Service Center.
CONDITION: Power indicator is
off
and power switch is not illu­
minated.
POSSIBLE REASON:
• Load is wired incorrectly or Output Mode
switch in LCD-screen menu is set incor-
rectly. Check both.
• Input is overloaded by a signal level that
is too high. Turn down your amplifier level
controls (Encoders), or turn down the
input signal, until the clip light goes out.
Note: If the signal sounds distorted even
though the Clip LED is off, the input signal
may be distorted before it reaches the
amplifier input. Check gain staging and
output levels of the mixer or preamp.