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What type of set up do you have ....an old zenith that was a turn table,radio in a cabinet or independent units, such as separate receiver, tape/CD /DVD Playing Recording unit? Also check connections in back of speakers (if they are separate from unit. It can be a number of things from bad Volume pot to a "magnetic' device to close to speaker system,to a bare connection to accidentally shorting against another connection. Check all your connections first. Hope this helps, Best Regards,Steve
Do you mean you want to connect 2 pairs of speakers, or just 2 speakers like you say in your question? There are 4 pairs of screws on the back of your amplifier on the upper right side of the rear panel near the fuse cap and the AC outlets. Each pair of screws will be connected to one speaker. Your Onkyo can be connected to 4 speakers. If you want to connect only 2 speakers, use the screws labeled "SPEAKER A" and connect the speakers to the left and right channels, and make sure you connect the + speaker wire to the screw with the red marking around it. Connect your other speakers the same way, one speaker per pair of screws.
YOU ARE GOING TOO FAR IN VOLUME CONTROL AND YOUR AMPLIFIER TRY TO PROTECT ITSELF BY MUTING-MAKE YOUR VOLUME LITTLE BIT DOWN.IF THE PROBLEM REPEATED WITH LOWER VOLUME SETTING YOU WILL HAVE INTERNAL PROBLEM.ANYWAY CHECK YOUR CABLES FOR GOOD CONDITION.
Since the unit recovers once it has powered down. I suspect that the internal protection circuit is kicking in. Check the wiring and be sure that there are no crossed wires anywhere. These amps are designed to work with 2 ohm loads and can take a direct short for a short period of time. If the wires appear ok, measure the speakers with an ohm meter. If the speakers are 4 ohm rated, they should measure just under 3 ohms with the meter, If they measure less than 2 ohms, there is a problem with the speakers.
Also, does the amp shutdown regardless of the volume level or just when played loud?
After about 100 CD-DVD units, I've found that most problems are from debris/film on the laser lens. If taking the cover off the unit doesnt scare you, unplug it and blow out the CD assembly with a can of compressed CO2 and VERY lightly clean the laser lens with 91% or better alcohol on a cotton swab. If that doesnt work , contact Cambridge Audio for a repair service.
As that unit is well over 5+ years old, I seriously doubt the part is available any longer. I doubt that you will even find a used part, and even if you do, it will probably be as bad as your switch. As I have worked on audio for over40 years, I would use LPS 2. It is a lubricant. Do not try this with WD40 or similar. Just spray the LPS on the wafers, or through any open holes in the switch. You just need a little. If you just squeeze the button, you will see just a little bit of foam. That is all you need. No more; no less. Rotate the switch from from left to right and back again multiple times. Try that. BTW, no manufacture uses these mechanical switches any more.The controls are now called Rotary Encoders, which basically are inputs to a display microprocessor IC(a computer within the new product) which in turn controls the inputs of a switching IC. It's the same as your old switch, just electronic, and much more complicated. If you need more information, or would like to inquire about repairing your unit, please visit my website at audioserviceclinic.com. You may contact me there. Thank you.