7 Troubleshooting; Operation Manual; Micro-Tech Series - Page 18

Micro-Tech Series 

Power Amplifiers

page 18

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.

7 Troubleshooting

OTHER POSSIBLE CONDITIONS 
TO BE AWARE OF: