Question about Marantz ZS5300 6-Channel Amplifier

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Marantz PM4000 amp keeps cutting out

My amp works perfectly but when it starts to reach above average volume it cuts out to mute and will only work when i turn it off and on again before cutting again when reaching that same volume. My speakers and CD player both work prefectly when tested with another amp. Is this repairable?

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There is a fairly simple fix to this problem here:

Posted on Mar 22, 2010



This is a known problem with the Marantz PM4000 amplifier and is present on certain models only. If you contact Marantz, they will repair this for you free of charge if your amp is affected.

Posted on Jul 05, 2007

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Ref our live chat: The user manual is here; and your nearest service centre is here; Unit 7 Bentinck Court, Bentinck Road UB7 7RQ West Drayton, Middlesex E-mail : Hope this helps :)

Posted on Apr 22, 2007

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Posted on Jan 02, 2017

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Some amps have a button which you press to mute the speakers when the headphones are plugged in. Sometimes marked "Speakers on off". If it hasn't then a new headphone socket would not be expensive to fit. As long as the amp producers sound I don't see any future problems. The previous owner may have used the headphone socket a lot, and simply wore it out!

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What's probably happening is that the amplifier is shutting down or cutting back the volume as protection from damage. You may have a partial short in the speaker wiring that is not a problem at lower levels, but at higher ones causes the amp to see too low a load. There may a problem with a speaker or crossover component that is breaking down at higher volumes. Or something in the amp's output stage is unable to handle the load.

Test the system with a known good speaker system and length of wire and see if the trouble continues. If it does, you'll know it's the amplifier that needs to be checked. If the test speakers can reach normal volume, you can start checking the wiring and other speakers for the source of the trouble.

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Mute function on the amp

A couple of questions to try and narrow this down:

1) What is the impedence rating for the speakers?

2) When the unit shuts down, will it recover on its own after a little while or do you need to power cycle it to get it to work again?

3) When the unit shuts down, is it hot?

Possible causes of this behavior:

1) Impedence rating too low causing the amp to work too hard and shutdown.

2) Excessive heat (caused by #1?) will shutdown the unit to prevent damage.

3) Possible intermittant short in the speaker wires somewhere? Loose connection?

A little more investigation will be required to find this. A repair shop would run this unit under load and monitor the outputs for heat and any spikes in the signal that could kick in the protection circuits.

Keep us posted on what you find.


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May be the problem solved here :

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I figured out the problem, the front right tweeter wire was pinched behind the mounting bracket. everything is now working perfectly.

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not enough power to amp and or amps location is too hot might want to invest in a couple cooling fans from computer store and attach where needed

an amp should take up to 3/4 load but when not enough air to it to cool it off it will shut down

try this turn gain all the way down and slowly work up too desired amp volume setting

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Checa las bocinas puede que no soporten la potencia del amplificador y por eso se protege.

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