Crown Audio CH Series Troubleshooting, Amplifier output wires have developed a short circuit

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CH and CL Series Power Amplifiers

6 Troubleshooting

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 power supply circuit breaker has tripped. Verify that input levels and out- put impedances are within safe ranges. Turn off the Power switch and reset the circuit breaker. Then, turn the Power switch back on. If it trips again or the unit fails to operate properly, contact an authorized Crown Service Center.

CONDITION: Fault indicator is flash- ing.

POSSIBLE REASONS:

• The amplifier has just been powered up and is not ready for operation yet.

• The heatsinks are too hot. Ensure ade- quate cooling. Remove excessive loads.

• The transformer (high-voltage power sup- ply) thermal protection is activated. Turn down the Level controls or the input sig- nal. Remove excessive loads.

• The amplifier output wires have developed a short circuit.

• The amplifier output stage has stopped operating. If so, return the unit to a Crown Authorized Service Center.

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.

CONDITION: Fault indicator is on.

POSSIBLE REASON:

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

CONDITION: Distorted sound.

POSSIBLE REASON:

•Load is wired incorrectly or Dual/Bridge 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 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.

CONDITION: No sound, even though the amp has power. Power LED is on without flashing 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.

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Operation Manual

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Contents CH and CL Series Some models may be exported under the name AmcronImportant Safety Instructions Use only with a cart, stand, tripod, bracket, orSafety Standard Crown International, IncEuropean Representatives Name and Address EMC StandardsTable of Contents How to Use This Manual FeaturesWelcome Setup Unpack Your Amplifier Install Your AmplifierChoose Output Wire and Connectors Choose Input Wire and ConnectorsReinstall no-touch cover to maintain safety Switch Settings Model CH4 Models CH1 and CH2Refer to .5 for output connector pin assign- ments Wire Your System Models CH1 & CH2 Stereo ModeModels CH1 & CH2 140V Bridge Mode Model CH4 Bridge Mode Model CH4 Stereo ModeInputs Connect input wiring to Channel Models CL1 & CL2 Bridge Mode Models CL1 & CL2 StereoModel CL4 Bridge Mode Model CL4 Stereo ModeInputs Connect input wiring to CH1 All Models How to Parallel the Inputs in Stereo Mode Startup ProcedureScrew terminal Connect to AC MainsPrecautions OperationCH and CL Series Front Panel Controls and Indicators Operation Speed Fan-On-Demand If the amplifier output stage stops operating IndicatorsControls Advanced Features Options SST-3632 SST-4622SST-4632 Fault Monitoring Location of Fault JackPrecision Detented Level Controls Attenuation in dBPrinciples of Operation CH1, CH2, CL1 and CL2Power Indicator LED is driven from the low-voltage supply Models CL1 & CL2 Circuit Block DiagramCH4 and CL4 Audio Signal Path Model CH4 Circuit Block DiagramModel CL4 Circuit Block Diagram Power Supply Operation Amplifier output wires have developed a short circuit TroubleshootingFlashing Specifications 120V/60 Hz Units, Bridge mono modeKHz at rated THD Ohms 560W Ohms 450WOhms 275W 600WModel CL1 & CL2 CH and CL Series Power Amplifiers Models CH4 & CL4 Damping Factor Typical Output Impedance AC Power Draw Thermal Dissipation Following equation is used to calculate thermal dissipationAC Power Draw Thermal Dissipation AC Power Draw Thermal Dissipation CL2 Service Warranty 12/01Worldwide Except USA & Canada Fax Mo/day/yrThis page Intentionally Left Blank Individual or Business Name Phone # Fax # Model‰ Personal/Consumer ‰ Business/Corporate
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