Hooked up some speakers after not using for a while and when I turn unit on after a few seconds the display reads PROTECT. I did find a speaker wire that shorted, corrected, unplugged and replugged everything hoping to reset, but same condition. I only see 3 fuses in the box and they look fine. The users manual says to contact service center, but given the age of the box and can't find a local place to work on, hoping someone can help me here. It's a great unit, but I don't want to spend a lot given the age and just using at this stage to drive some in house speakers.
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pls. check speaker wires for any open cracks. try the speakers to another amplifier and if it works from there your onkyo must be in trouble. open the unit and check for any blown fuse, if found any replace it w/ the same value, do not replace fuses w/ higher value.
The protect message appears when the current powering an amplifier inside the receiver goes beyond the safety limit or the amplifiers overheat. So just check the wiring and the speakers impedance with an ohmmeter - each should be above 6 ohms
If they are lower then you have a short in one of the actual drivers of the Bose 901 speaker . If the impedance is OK then the Onkyo overheats, place it in a better position to increase the airflow thru it.
This indicates that the system is going into protect mode. First disconnect all speaker wires (with the power cable disconnected). Then turn the unit on and see if it sill shuts aff ofter a few seconds. If it does not, then you have a problem with the speakers or speaker wires. inspect the wires at both ends for frayed strands that may touch. If that all lookd good, plu the speakers in, one at a time, until the problem reappears. Be sure to turn the sytem off before plugging in any speaker just to prevent any accidental short which could be catastrophic. If the system goes into protect mode with all speakers disconnected, you probably have a shorted output transistor.
Just check your speaker cabling again. Make sure that all of them are seated properly, none is touching each other or the body of receiver. Rewire if necessary..
Are you using banana plugs for connecting speaker or just directly. Some times even a little tiny wire touching the receiver could trigger the protect mode. Be careful, since protect mode is sometimes not fast enough and it could blown a few trasistors in the power circuit.
Otherwise, do your bose speakers play out load on other systems?
Is there an indication of protect mode on the front display? Have you checked to see if the tape monitor switch is on? Did you hear a click when you first turn on the receiver followed by a second click?
The protect mode is a built in safety message, indicating that theres a fault somewhere with-in the unit, and it wont let the unit come on fully or more damage will occour. This unit is a solid state device, and you should not attempt to use it or open it or try any self repair as it will cause more damage. If this unit is more then a few years old , it might just be the time to start looking around at all the back to school sales on electronics, as to have this unit serviced will cost an estimate fee as well as parts and labor. If you want to invest a few bucks into this machince , then go for it, but its most likly will cost 1/2 or more then the cost of the entire unit did when it was new to have it repaired. It is up to you. Good Luck