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Micro-Tech Series Power Amplifiers
Operation Manual
CONDITION: Normal operation.
The Enable (Power) LED is on, and the ODEP LEDs
are on or flickering.
ODEP LEDs on indicates a high energy
reserve. An ODEP LED flickering means that
the energy reserve for the affected channel is dip-
ping.
CONDITION: Normal LED display but
distorted sound.
POSSIBLE REASON:
• Load is wired incorrectly or
Stereo/Mono mode switch is set incorrectly.
Check both.
• Input signal level is too high. Turn down your
amplifier level controls, or turn down the input
signal, until the clip LED goes out.
Check mixer levels and gain staging, mixer clip
lights, and pads built into microphones.
CONDITION: Normal LED display but
no sound.
POSSIBLE REASON:
• Input signal level is very low.
• Level controls are turned down.
• Input cable broken or not plugged in.
• Speakers not connected.
• The amplifier output level is so high that the
breaker has tripped. Try to identify and correct
the problem before resetting the breaker. If the
problem persists, refer the unit to an autho-
rized Crown Service Center.
• The amplifier output is shorted. First discon-
nect your speakers from the affected chan-
nel(s) one by one to determine if one of the
loads is shorted.
CONDITION: Enable LED on, ODEP
LEDs off, no sound. Low-voltage power
supply and fan are still working.
POSSIBLE REASON:
• Transformer thermal protection has activated.
Amplifier will come back on automatically
when it cools.
• ODEP reserves have been depleted and the
amplifier is about to activate protection.
• High-voltage power supply fuse or breaker has
blown.
Check for shorts in the speaker lines. Avoid loads of
1 ohm or less. Let the amplifier cool down, then
reset the breaker (Micro-Tech 2400 only).
CONDITION: All LEDs off.
POSSIBLE REASON:
• The amplifier has lost power.
• The amplifier is not plugged into the power
receptacle.
• The amplifier’s circuit breaker has tripped.
Allow the amplifier to cool; check for shorts in
the speaker lines; remove excessive loads.
Then reset the breaker.
• The amplifier has blown its internal fuse for the
low-voltage power.
supply. Refer the unit to a qualified technician.
• The power switch is off.
7 Troubleshooting
OTHER POSSIBLE CONDITIONS
TO BE AWARE OF: