Crown Audio D-75A - Manual (Page 14)

D Series Power Amplifiers
page 14 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: Distorted sound.
POSSIBLE REASON:
• Load is wired incorrectly.
• Input signal level is too high. Turn down
your amplifier level controls, 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 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 and
the amp is receiving an input signal. Signal
indicator is flashing.
POSSIBLE REASON:
• Speakers not connected.
• Open circuit due to speaker failure.
• 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.
CONDITION: No input signal.
(Signal indicator is not flashing even though
audio is applied).
POSSIBLE REASON:
• Input signal level is very low.
• Level controls are turned down.