13Clip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerON/OFF MUTINGSHORTED LOADCLIPPINGOVERHEATINGTHERMAL MUTINGNot IlluminatedFull BrightnessVariable orOccasional FlashingFlashingFull Bright& FlashingKey to LED representations:OperationCLIP is illuminated at full bright-ness when the output is muted(PROTECT LED is on, too).If CLIP is illuminated at less thanfull LEVEL display, the load isshorted or abnormal. PROTECTmay flash, too.CLIP flashing at full LEVELdisplay indicates the amp hasreached full power (clipping)and the limiter is acting toprevent severe overdrive.A steady CLIP glow after theflashing PROTECT display hasstarted indicates the onset ofthermal limiting.PROTECT flashes as the amplifi-er approaches max temperature.Full brightness plus flashingindicates thermal muting.Figure 14. LED DisplaysDuring Normal OperationClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerClip-10dB-20dBSignal PresentProtectPowerNO SIGNALSIGNAL PRESENT (-30 dB)LEVEL -20 dBLEVEL -10 dBCLIPPINGFigure 15. LED Displays During Abnormal Operating Conditions