Yamaha XP7000 Owner's Manual - Page 12

Troubleshooting The following table lists the main causes of abnormal operation and the corrective measures required as well as the protective circuit operation in each case. Indicator(s) Possible Cause Remedy Protection Circuit CLIP indicator lights. There is a short at a speaker terminal, amplifier terminal, or wire. The amplifier load is excessive. Locate and correct the cause of the short. Use a speaker system with an impedance of at least 4 Ω (STEREO/PARALLEL mode) or 8 Ω (BRIDGE mode). The PC limiter circuit operates to protect the power transistors. TEMP indicator lights. The heat sink temperature has exceeded 85°C (185°F). Check the ventilation slots, and provide better airflow around the amplifier. The TEMP indicator lights up to indicate temperature warning. PROTECTION indica- The heat sink temperature has tor lights. exceeded 90°C (194°F). Check the amplifier ventilation conditions and take appropriate measures to improve the airflow around the amplifier. The thermal protection circuit operates to protect the power transistors. ● XP3500, XP2500 Indicator(s) Possible Cause PROTECTION indicator lights. A DC voltage of +2 V/-2 V or greater was generated in the power amplifier's output circuit. Remedy Protection Circuit Consult your dealer or the nearest Yamaha service center. The relay operates to protect the speaker system. ● XP7000, XP5000 Indicator(s) Possible Cause Power has been shut down. (All indicators are off.) A DC voltage of +2 V/-2 V or greater was generated in the power amplifier's output circuit. Remedy Protection Circuit Consult your dealer or the nearest Yamaha service center. The protection circuitry shut off the power to protect the speaker system. 12 XP7000/XP5000/XP3500/XP2500/XP1000 Owner's Manual