Question about Marantz PM7200 2-Channel Amplifier

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Hi, i have a marantz pm720 amp, when i switch it on, straight away it starts to make loud cracks through the speakers like spikes,then it will cut sound all together for a few seconds then back on, when i push buttons 1 & 2 speakers the spikes sounds seems to come from the relays that i can hear clicking in,. Thank You Paul C

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  • 1,175 Answers

Hi Paul;
There are one or more transistors failed in the output circuit
I would have tech look at the amp and see what the power supply is doing without spkrs connected

Posted on Aug 20, 2010

Testimonial: "Hi Petraman7, Cheers for your reply i think your right, i'll have to have a tech guy to look at it, any idea how much it could cost. Cheers Paul C"

  • Scott Frye
    Scott Frye Aug 25, 2010

    I would estimate $90-120 if it were in my shop

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1 Answer

I have a marantz st100 receiver, and everything seems to work well with one exception. There is static in one channel that comes and goes, and sometimes gets quite loud. The problem follows the channel...


It could be a burned out resistor in the main power amp. Follow the channel wires from the speaker that is playing up till you get to the power amp. Look around for anything odd. Compare it with the other channels, as they are good.

Oct 03, 2017 | Marantz Audio Players & Recorders

1 Answer

My Marantz 4270 receiver makes a loud crack noise over the speckers and cuts out for about 5 seconds and then starts up again. This happens about every 30 min. Any one have the same problem?


You need to resolve it or stop using it as those loud noises are dangerous to your speakers.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Jul 07, 2011 | Marantz Audio Players & Recorders

1 Answer

Hi Strange problem with Marantz pm7001 When ever I turn the volume upto around 1/3 and 1/2 of the way, the amp cuts out and reset it self down to minimum volume. It seems like the amp ins't enough power...


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.

Mar 13, 2011 | Marantz Audio Players & Recorders

1 Answer

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.

Dan

Jun 07, 2010 | Marantz Audio Players & Recorders

1 Answer

Marantz SR9200 shuts off intermittently while watching or listining.


Check all speaker connections. unplug everything.. start with just L and R speakers. Do a mic calibration..also check all your source inputs to the amp. start from the basics. Is the amp still under factory warranty? I used to install marantz...also make sure unit is well ventilated. IF you are using audio zones in your place..with in wall volume controls..make sure they are impedance matched. VOLUME may be set to high...overdriving the outputs..eventhough audio may not be loud. Set volume to -30...?

May 06, 2010 | Marantz SR-9200 Receiver

1 Answer

All I want to do is run an extra set of speakers for outdoor use. I want to be able to listen to the same music indoors and out. Is this possible without separate amp?


Yes definatly. The speakers farthest away will be a little quiter but will still be plenty loud enough to hear and enjoy.



Jul 01, 2009 | Marantz SR-19 Receiver

1 Answer

My mordaunt-short avant 908i front left speaker aluminum tweeter stopped working... no sound coming out, however two midrange speakers functioning just fine.


I had similar problems my tweeter was blowen and it had to be replaced... I actually blew the speaker many times using a NAD amp as there were spikes coming from the amp. I changed the amp to a Marantz PM7200 and have had no problems since.

May 06, 2009 | Mordaunt Short 908 Main / Stereo Speaker

2 Answers

Wiring diagram Max 2255 Addzest sound system


BE MORE SPECIFIC!

Why do you need to trace them? Is it a stock amp? If you know where the amp is....then tracing the wiring is a cinch....

The amp has to be powered, so there's most likely a power wire from your battery. If it's a stock amp, it's powered from behind your cd player. And be more specific, what speakers? There's like what, six?

They all go to one spot man, right behind the cd player.

What's spiking? The sound? As in it's loud, quiet, loud, quiet, loud? You might have a bad ground somewhere, so check grounds. Those are easy to find, behind the deck the ground is black. If it's an aftermarket amp, then the ground is going to be close by to it. It's most likely screwed to the steel part of your car.

It could be your deck to, it might have just got randomly defective. You do have a 96 after all.

If it's an aftermarket cd player...check your wiring harness. You have to cut the wires from the car to tie them into the harness for your cd player, so jiggle those around to see if you can hear a difference.


Jul 21, 2008 | 1996 Mitsubishi 3000GT

1 Answer

Marantz Sr8500


Check the speakers impedance. it should be greater then 6ohm otherwise you overload the system. Also, if the speaker sytem is rated (in Watts) below the amplifier's power it overloads the amp at higher volumes.

Apr 12, 2008 | Marantz SR8500 Receiver

3 Answers

Marantz PM4000 amp keeps cutting out


There is a fairly simple fix to this problem here: http://www.audiotoolers.com/ubbt/ubbthreads.php/topics/5316/Problems_with_Marantz_PM4000_A.html

Apr 22, 2007 | Marantz ZS5300 6-Channel Amplifier

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