Yamaha XM4180 Owner's Manual - Page 12

■ Speaker Connection 1 Turn off the POWER switch. 2 Remove the cover attachment screws and remove the protective cover from the speaker terminals. Screw When using barrier strip terminals (XH200) Wrap the wire around the terminal as shown in the illustration, and tighten the screw to securely clamp the wire. Refer to 10 page for speaker polarities. Be sure that the bare wire ends do not jut out from the terminal and touch the chassis. 3 Remove about 15 mm of insulation from the end of each speaker cable. 4 When using 5-way binding posts (XM4180, XM4080) Pass the bare wire through the holes in the appropriate speaker terminals. Tighten the terminals to securely clamp the wires. Refer to 9 page for speaker polarities. Be sure that the bare wire ends do not jut out from the terminals and touch the chassis. Chassis Bare wire * Actual size Speaker cable Wire should not touch the chassis. 5 Reattach the protective cover over the speaker terminals. 15mm* Speaker cable * Actual size 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 Possible Cause Remedy Protection Circuit CLIP/LIMIT indicator lights up There is a short at the amplifier's speaker outputs, the speaker's inputs, or in the wiring. The impedance of the connected speaker is too low. PROTECT/ MUTE indicator lights up The temperature of amplifier is too high. A DC voltage of ±2 V or greater was detected in the amplifier's output circuit. Locate and remove the short. Check the impedance rating of the connected speaker and make sure that it conforms to the impedance indicated at the speaker terminals on the amplifier. The PC limiter circuit activates to protect the power transistors. Let the amplifier cool and check that ventilation around the amplifier is appropriate for operation, as suggested in the Precautions section. The thermal protection circuit activates to protect the power transistors. Consult your dealer or a Yamaha service center. The output relay activates to protect the speaker system. 12 XM4180/XM4080/XH200 Owner's Manual 10