Marantz SR-7200 Goes to pure static and volume spikes
While watching a DVD or listening to music, the receiver will spontaneously lose the correct audio and instead spit out pure noise at very high volume.... it sends my toddler running for the other room.
I believe it maybe related to the Optical inputs but hard to say since that is all I typically use. Have tried replacing Toslink cables. Bought a Cheap Sony and no more issues, so I am pretty sure I have isolated it to the Marantz. Would like to use it in another application, but wondering if it is worth the $ to fix, or maybe I spend $400 on an Onkyo... Thoughts ?
Re: Marantz SR-7200 Goes to pure static and volume spikes
If the noise is not present in Direct or Pure Direct mode it is definitely associated with digital circuits.
I assume, the unit is not under warranty. Open it and inspect connections to and from digital board. If this does not help it might be faulty connection on the board and it is better leaveing this to a specialist. I hope you did not fiddle with the service menu?!
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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.
The video switching on your receiver is bad. This is a sore spot in an otherwise excellent unit. IFfit is out of it's 3 year warr. the repair will be prohibitive so I suggest getting a video switcher and use it instead. Some of them can be programmed to work with the Marantz remote so you don't have to switch with 2 remotes.