Troubleshooting - Crown 140MPA Operation Manual

4 Troubleshooting

page 14
CONDITION: No power to the
mixer-amplifier.
POSSIBLE REASON:
• The mixer-amplifier's Power switch is off.
• The mixer-amplifier is not plugged into the
power receptacle.
• The mixer-amplifier's high-voltage power sup-
ply circuit breaker has tripped. Verify that the
AC mains voltage is correct, then press the
Reset button on the back panel.
CONDITION: Distorted sound.
POSSIBLE REASON:
• Input signal level is too high. Turn down your
input volume controls. NOTE: Your mixer-
amplifier should never be operated at a level
which causes the Clip LEDS to illuminate con-
stantly.
• Master volume level is too high. Turn it down
to about 3/4 of maximum level.
Commercial Audio Series Mixer-Amplifiers
CONDITION: No sound.
POSSIBLE REASON:
• The amplifier is in "fault" mode. A Fault status
can be triggered when one of the amplifier's
[NO GRAPHIC IS NEEDED protection circuits is activated. First disconnect
HERE] your speakers from the affected channel(s) one
by one to determine if one of the loads is
shorted. If an amplifier channel has a thermal
fault, there will be no indication on the front
panel, but the amp will recover after cooling. If
operation does not return to normal after
restarting your amp, press the Reset button on
the back of the unit. If that does not work, return
the unit to Crown or an authorized Crown Ser-
vice Center for servicing.
• No input signal.
• Input signal level is very low.
KEY
LED OFF
LED ON
Operation Manual