CT Power Amplifiers

15 Troubleshooting

FLASHING

15.1 Power Indicator

 

CONDITION: Thermal indicator is flashing

 

POSSIBLE REASON

OFF

 

 

• Amplifier has become too hot to operate. Allow amplifier

 

 

 

CONDITION: Power indicator is OFF.

 

to cool. Amplifier will not pass audio if amplifier has

POSSIBLE REASON

 

become too hot

 

 

• The amplifier has lost AC power.

 

 

• The amplifier’s Power switch is off.

15.4 Clip Indicator

• The amplifier is not plugged into the power receptacle.

ON or FLASHING

• The amplifier output level is so high that the power supply

 

 

 

 

circuit breaker has tripped. Allow the unit to cool. Turn

 

CONDITION: Clip indicator is ON or FLASHING.

down the Level controls. Press the Reset Switch on the

 

POSSIBLE REASON

back panel.

 

 

 

• input level or output level is distorting

FLASHING

 

 

 

 

CONDITION: Power indicator is FLASHING.

POSSIBLE REASON

• The AC line voltage has dropped below +15/-25 or has risen above +15/-25% of the nominal­ line voltage of the power supply.

• Amp is in Deep Sleep Mode.

15.2Fault Indicator

FLASHING

CONDITION: Fault indicator is FLASHING.

POSSIBLE REASON

• The amplifier channel has stopped operating­. Refer the unit to an authorized Crown Service Center.

• Check for shorted outputs

15.3Thermal Indicator

ON

CONDITION:Thermal indicator is ON.

POSSIBLE REASON

• The amplifier is becoming too hot for safe operation. Allow amplifier to cool. Check for loads less than 4 ohms, and for excessive input levels. Check for proper ventilation and proper mode-switch setting­.

15.5Signal Indicator

OFF

CONDITION: Signal indicator is flashing even though audio is applied, and the channel is ready.

POSSIBLE REASON

Input signal level is very low

Level controls are turned down

15.6Ready Indicator

OFF

CONDITION: Ready indicator is OFF.

POSSIBLE REASON

• Amplifier may be in deep sleep

FLASHING

CONDITION: Ready Indicator flashing

POSSIBLE REASON

• Amplifier is in Standby mode. Flashing will stop once there is an input signal.

Operation Manual

page 15

Page 15
Image 15
Crown CT 475, CT 8150, CT 875, CT 4150 operation manual Troubleshooting