Marantz 8400 Shutdown Issue

[hawkeye43]

Any ideas as to why my Marantz 8400 reciever will momentarily shut off and display PROTECT. I cannot find anything in the owner's manual. The volume is not turned on loud. If I go anything past -24 on the volume it will shut down. This was not an issue the past month and it just started to do this.

 

[Buckeyefan 1]

Any ideas as to why my Marantz 8400 reciever will momentarily shut off and display PROTECT. I cannot find anything in the owner's manual. The volume is not turned on loud. If I go anything past -24 on the volume it will shut down. This was not an issue the past month and it just started to do this.

Welcome to the forum.

Disconnect all your speaker wires from the receiver, and see if it still shuts down when you go past -24. If it does, there's a short in the receiver. If not, it's either a speaker wire or speaker itself. Usually it ends up being a stray speaker wire touching the opposite polarity.

 

[hawkeye43]

Thanks Buckeye. I will try it out. You should have taken it to Penn State like you did to us Hawkeyes!

 

[Buckeyefan 1]

Thanks Buckeye. I will try it out. You should have taken it to Penn State like you did to us Hawkeyes!

I'm through a half a bottle of wine right now. We $uck. Paterno may have the team this year. We definitely don't have the offense. I'd take your QB over ours any day!

 

[j_garcia]

What speakers are you running?

 

[patnshan]

I'm through a half a bottle of wine right now. We $uck. Paterno may have the team this year. We definitely don't have the offense. I'd take your QB over ours any day!

Maybe your defense can get together with our (Wisconsin) offense. Maybe we could make a good team out of the two?

Pat

 

[patnshan]

Welcome to the forum.

Disconnect all your speaker wires from the receiver, and see if it still shuts down when you go past -24. If it does, there's a short in the receiver. If not, it's either a speaker wire or speaker itself. Usually it ends up being a stray speaker wire touching the opposite polarity.

I agree totally! It's gotta be something like that. I can turn all seven speakers up to deafening levels and CANNOT get my SR8400 to go into protect mode.

Are you running 4 ohm speakers? If so, it could be that. I think the 8400 is designed to go down to 6, not 4. 4 ohm speakers often get even lower than that sporadically.

Good luck,

Pat

 

[j_garcia]

Are you running 4 ohm speakers? If so, it could be that. I think the 8400 is designed to go down to 6, not 4. 4 ohm speakers often get even lower than that sporadically.

4 Ohm speakers will unquestionably drop low, since they start at 4 nominal. Mine are 2.6 Ohms minimum. All my speakers are 4 Ohms and the 8300 doesn't like it, which is why I added the monoblocks for the mains. It seems to be doing fine with just three 4 Ohm speakers on there, and that's how I've been running for months.

 

[hawkeye43]

What speakers are you running?

I am running Infinity Towers for the front speakers with an Infininty Center Channel. The surround and rears are Cambridge Soundworks and all of them are 8 ohm speakers. I could turn up these speakers with no issue about a month ago when I just played the tuner. I hooked it up to the TV and DVD and now it goes into protect mode if a sudden loud noise kicks on like thunder etc.....I turned it back on to just the tuner and the same thing happens. I do not have anything plugged into the receiver on the switched or unswitched outlets.

 

[porksoda]

Faulty Speaker Wire.

I would disconnect ALL speaker wires from the unit and see if it goes into protect mode. If it does not then there might be cable shavings on the speaker terminals... clean em up... try again if still goes to protect send it in for service.

Most likely its faulty speaker wire and/or shavings on the terminal.

Then try one speaker at a time to eliminate which one has a bad cable.

I am running Infinity Towers for the front speakers with an Infininty Center Channel. The surround and rears are Cambridge Soundworks and all of them are 8 ohm speakers. I could turn up these speakers with no issue about a month ago when I just played the tuner. I hooked it up to the TV and DVD and now it goes into protect mode if a sudden loud noise kicks on like thunder etc.....I turned it back on to just the tuner and the same thing happens. I do not have anything plugged into the receiver on the switched or unswitched outlets.

 

[j_garcia]

Faulty Speaker Wire.

I would disconnect ALL speaker wires from the unit and see if it goes into protect mode. If it does not then there might be cable shavings on the speaker terminals... clean em up... try again if still goes to protect send it in for service.

Most likely its faulty speaker wire and/or shavings on the terminal.

Then try one speaker at a time to eliminate which one has a bad cable.

Excellent advice, and exactly what I recommend also. A SINGLE strand of wire grounding to the chassis or another terminal can cause this, so start with the connections at the receiver.

 

[hawkeye43]

Excellent advice, and exactly what I recommend also. A SINGLE strand of wire grounding to the chassis or another terminal can cause this, so start with the connections at the receiver.

And all of you are so excellently correct. Must have been a grounded wire on the front right speaker. All is working awesome. It was a bummer after just connecting the 73" new Mits and could not crank it up. Thanks to all!