Question about Marantz PM7200 2-Channel Amplifier

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Marantz PM7200 after turning the unit on it starts to emit a buzzing sound from the right hand side of the amp which i havn't noticed this normal?

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Re: marantz PM7200

No! you got shorted or leak capacitors, and change value resistors.

Posted on Sep 25, 2007

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Distorted sound / fuse blows off when changing amp class.

The class A switch adjusts, via an optocoupler, the bias on the output transistors.
I would check the standard bias and class A bias adjustments.

Mar 22, 2014 | Marantz PM7200 2-Channel Amplifier

1 Answer

Hello, I have a Marantz PM7200 and for several months now I've been having a the following problem. Every now and then the sound crackles or disappears on the left, right or both speakers. I'm quite sure...

Try wiggling the speaker cables where they connect into the PM7200. If it crackles get the shop to check for 'dry joints' in the unit. It is quite normal for things to look ok and to work perfectly in the workshop, but that is not a good test. Dry joints are quite difficult to spot and any soldered joint 'looks' ok, but if the soldering temperature is a bit off, usually on the low side where the solder is only just about hot enough to melt, it will result in a what we call 'dry joint'. It is not unfrequent to get this problem with production line processes as there are many factors on the assembly line that can effect the tip of the soldering unit. It can be as simple as someone getting up out of a seat and changing the air flow that then causes the soldering tip to cool slightly. We are taking 'parts' of a degree temperature changes. The shop should have equipment to test the conductivity of soldered joints. A light hand during testing is a prerequisite!

Mar 15, 2011 | Marantz PM7200 2-Channel Amplifier

1 Answer

Where is the internal fuse of marantz pm7200
The top link is for a manual for your model. The second link is a Fixya link concerning "no power". I'm not sure why you are looking for fuse but, have to assume it's a no power issue.
The above link is a support link for Marantz. Hope this helps.

Mar 10, 2011 | Marantz PM7200 2-Channel Amplifier

1 Answer

Marantz PM7200 in classA mode make a hum ( not through speakers)

So something is making a hum inside the unit? Well the answer is to listen to what is making the hum, with your ear (a drinking straw held to your ear will help locate where it's coming from). Once you have found the part "huming" replace it. See if that cures it.

Jan 19, 2011 | Marantz PM7200 2-Channel Amplifier

1 Answer

Marantz pm7200 hdam, will not power up, checked internal fuses all ok, over rid the internal power-on rely and power amp powers up but pre amp circuit still dead, any idea, power panel look fine but...

The preamp stage might be dead. Not much you can do but to bring it in. Make sure the input selector is on the right input.
Sometimes there's a "Monitor input" usually Tape2 input that overrides everything

Sep 01, 2010 | Marantz PM7200 2-Channel Amplifier

1 Answer

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...

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

Aug 20, 2010 | Marantz PM7200 2-Channel Amplifier

2 Answers

Marantz dedicated amplifier squeals

The symptom sounds like a feeback loop. As long as that indicator is showing near maximum output on one channel AVOID ATTACHING ANY SPEAKERS TO IT!!!! You'll cook the tweeters.

Turn it off and manually operate every control, knob and pushbutton throughout its range many times to wipe oxides away from their conductors.

Set all EQ controls to their midpoints and re-evaluate.

We don't know if it's an input or output problem yet. Does it do that with all inputs?

Jan 19, 2010 | Marantz PM7200 2-Channel Amplifier

2 Answers

How do i connect my ipod to my marantz PM7200

As dunnbiker said, get a headphone to RCA adapter. After that you may find that you still need a bit more gain out of your ipod. There are lots of solutions. Google preamp or check out Sound Shocker by PHP Audio.

Nov 29, 2009 | Marantz PM7200 2-Channel Amplifier

2 Answers

Marantz pm 7200 lost sound, only works when volume is up high, still looks like there are no high or medium frequencies.

You have either lost the pre-amp stage or the Main Amp stage. Since you have a problem on both channels it most be a part that is common to both channels. Something like an IC I would suspect.

Oct 31, 2009 | Marantz PM7200 2-Channel Amplifier

1 Answer

Marantz Pm-7200 left channel weak compared to the right

hmmm. Let's start by swapping the wires you are using for your speakers. Double check the wire connections first, then take the left and place iton the right and vice versa.

May 05, 2009 | Marantz PM7200 2-Channel Amplifier

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