Crown Audio CTs Series (Multi-Channel USP_CN) - Manual (Page 13)

Operation Manual
CTs Multi-Channel Power Amplifiers
page 24 page 25
CTs Multi-Channel Power Amplifiers
Operation Manual
CONDITION: Power indicator is off .
POSSIBLE REASON
• The amplifier has lost AC power.
• The amplifier’s Power switch is off.
• The amplifier is not plugged into the
power receptacle.
• The amplifier output level is so high that
the power supply fuse has blown. Verify
that input levels and output impedances
are within safe ranges. Refer the unit to
an authorized Crown service center for
fuse replacement.
CONDITION: Power indicator is
flashing
.
POSSIBLE REASON:
• The AC line voltage has dropped below
10% or has risen above 10% of the
nominal line voltage of the power supply.
Refer to section 5.1.6 for specific voltage
requirements.
CONDITION: Fault indicator is on.
POSSIBLE REASON:
• The amplifier channel has stopped
oper ating. Return the unit to an
authorized Crown Service Center.
CONDITION: Distorted sound
.
POSSIBLE REASON:
• Load is wired incorrectly or Dual/Bridge
mode switch is set incorrectly. Check
both.
• Input is overloaded by a signal level that is
too high. Turn down your amplifier level
controls, or turn down the input sig nal,
until the clip light goes out.
• Thermal Level Control (TLC) is active.
Note: If the signal sounds distorted even
though the Clip LED is off, the input signal is
distorted. Check gain staging and output
lev els of the mixer or preamp.
5 Troubleshooting
CONDITION: No sound, even though
the amp has power.
Power LED is on
without flashing and the amp is receiving an
input signal. Signal indicator is flashing.
• Speakers not connected.
• Open circuit due to speaker failure.
• Level control is down.
CONDITION: No input signal.
(Signal indicator is not flashing even though
audio is applied and channel is ready).
POSSIBLE REASON:
• Input signal level is very low.
• Input cables have become disconnected.
• There is a short on the amplifier
output. First disconnect your speakers
from the affected channel(s) one by one
to determine if one of the loads is
shorted.
5 Troubleshooting
(continued)
CONDITION: Thermal indicator is
flashing.
POSSIBLE REASON:
• The amplifier has become too hot for
safe operation. Check for loads less than
2 ohms, and for excessive input levels.
Check for proper ventilation and proper
mode-switch setting. Driving low-
impedance loads while in high-voltage
mode can cause overheating.
CONDITION: All channel thermal
indicators are flashing.
POSSIBLE REASON:
• Power supply thermal overload.
• DC or excessive low-frequency signal at
the amplifier’s output has enabled
speaker protection.
CONDITION: Bridge LED is flashing .
POSSIBLE REASON :
• The mode switch was switched while the
power was on.