having same issue...power immediately switches back to standby everytime I turn power on. It works for many months, had to take system out and put it back in correct ( hopefully...) and now this. Zapped huh? What could I have done to fry the outputs? Jim
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Re: marantz SR 7200
Most often it is due to improper speaker loading. In other words,
it needs to have from 4 to 8 ohms speaker load and you wired your
speakers in parallel when they should have been wired in series.
What would have been an 8 ohm speaker load in series, turns into a 2
ohm load when in parallel. And with dual voice coil speakers you
just compound the problem. And don't even get me started on
Anyway that is what usually causes an amp to fry. Good luck.
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If you don't use the remote control is it okay? If so, tear apart your remote control, use a Q-tip to clean all the lines in the circuit board where the rubber contacts touch. Then make sure that the rubber buttons don't have any 'gunk' on them that are making them stick. Clean the rubber pad with a qtip with dishsoap. Dry well, put back together and see if she works. Report back on your success. Good luck.
Press AMP then OK on your remote. If the menue does not appear press 9 on the remote. You must have your monitor connected through composit Monitor Out or S-VHS. Also check your multiroom settings. Maybe your OSD signal is diverted through to other room. I do not have SR-7200 any more, unfortunately.
It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault. I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage. Good luck.