Yamaha CP2000 Owner's Manual - Page 17

Troubleshooting 13 Troubleshooting The following table explains the operation of the CLIP, TEMP, and PROTECTION indicators, typical situations in which they may light up, and what action to take if and when they do. Symptom POWER indicator not lit No sound Stereo sources sound odd CLIP indicator lit TEMP indicator lit PROTECTION indicator lit Possible Cause Power cable disconnected or amplfier turned off. Input signal not connected or LEVEL controls turned down. Incorrect speaker polarity. The input signal is too high. The speaker impedance is too low. There is a short at the speaker terminals, amplifier terminals, or in the speaker cable. The heatsink temperature has exceeded 85˚C. The heatsink temperature has exceeded 90˚C. A DC offset of ±2 V or more was detected at the amplifier's outputs. Remedy Protection System Make sure the power cable is connected properly and the POWER switch is in the ON position. Check the input connections and LEVEL control settings. Check the polaity of the speaker connections and correct if necessary. Reduce the input signal level, or turn down the LEVEL control. Ensure that the total speaker impedance is not less that 2Ω (STEREO/PARALLEL) or 4Ω (BRIDGE). - - - The limiter circuit prevents further clipping distortion. Locate and remove the short. Make sure that the air vents are not blocked and improve the airflow around the amplifier. Make sure that the air vents are not blocked and improve the airflow around the amplifier. Contact your Yamaha dealer or service center. The heatsink temperature warning circuit activates. The protection circuit activates, opening the output relay and disconnecting the speakers. The output relay closes automatically when the heatsink has cooled down, or the DC fault is removed. CP2000-Owner's Manual