Yamaha receivers have a built in computerized protection circuit, which will activate in certain over-current conditions. This means that the unit is drawing too much current through the amplifier or power supply, and the built in computer turns the receiver off. This is designed to protect your receiver and speaker systems. There can be several different reasons that the receiver will shut off prematurely. In many cases, premature shutoff of your unit can be caused by a problem with the speaker wiring between the receiver and speakers. A single strand of wire in the wrong place (causing a short circuit condition) will cause the unit to shut off at anything but very low volume levels. To see if this might be the problem, please follow the simple troubleshooting steps outlined below.
- Disconnect all of the speaker wires from the back of the receiver.
- Turn the receiver on, and turn the volume control up to about half way. If the receiver stays on, please go to Step 3. If the receiver shuts off right away, the unit will require service. Please consult with your dealer for further assistance.
- Carefully inspect all of the speaker wiring and the connections at the back of each speaker. Remove and reconnect the wiring at the back of each speaker if necessary.
- Re-connect the main speakers only, and test the system. If operation appears normal, turn the power off and re-connect the surround speakers. If it shuts down prematurely, you should have your main speaker system checked.
- Test the system after the surround speakers have been re-connected. If operation appears normal, turn off the power and re-connect the center speaker. If it shuts down prematurely, you should have your surround speakers checked.
- Test the system after the center channel speaker has been re-connected. If operation is normal, you have located and fixed the over-current condition. If the receiver shuts off prematurely, you should have the center channel speaker checked.
Other problems which might cause premature shut off can include using speakers with impedance of less than 4 ohms, speaker selector boxes with multiple pairs of speakers connected to one terminal, an internal problem with the receiver, or a problem with a source component.