Question about Marantz PM7200 2-Channel Amplifier

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Marantz PM7200 Amplifier, wont switch on, no power light. Changed the plug fuse, checked the fuse inside, looks ok but not got a spare to change it.

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You can check the fuse with a battery and a bulb. Take the fuse out and use it to make a circuit with some wire, the battery and bulb. If the bulb doesn't light it has gone.
Apart from that other things to check are the power switch, to see if it works and the transformer.
It might be worth buying a cheap Ohm meter, if you haven't got one. You can check most of the parts in the power supply with it. By the way if the fuse has blown, buy a few as you might find it could blow again when you try it again. If it does you are looking at a device (such as a transistor) that as shorted and acting like it was a piece of wire. Which is easily found with an Ohm Meter!

Posted on Sep 28, 2010

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Posted on Jan 02, 2017

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1 Answer

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


http://www.retrevo.com/support/Marantz-PM7200-manual/id/511bh847/t/2/
http://www.fixya.com/support/t409652-marantz_pm_7200
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.
http://livesupport.maybenow.com/Marantz
The above link is a support link for Marantz. Hope this helps.

Mar 10, 2011 | Marantz PM7200 2-Channel Amplifier

1 Answer

Hi, I have a Marantz PM7200 KI Signature, This morning sadly realised that the amp is gone, There is no light on, something like no power. Firstly, I look for the fuse socket but there is no socket on...


hi,
First of all check the power at the socket to which you have connected the amp.If you are not aware of electronics, then do not go for a test with an amp like KI signature.
it will have a fuse in its inside. its only blow off if there is some fault inside the its circuitry. consult someone who is well equipped for the same.
ok

Feb 06, 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

NO DSPLAY LIGHT OR OUTPUT


it sounds like your power surged maybe and it fried it check on the circut boards and see if you see any black spots like burns

Apr 27, 2010 | Marantz PM7200 2-Channel Amplifier

1 Answer

Marantz pm 7200


Could be a power supply failure or a Power "On" switch failure.

Kev

Feb 23, 2008 | Marantz PM7200 2-Channel Amplifier

1 Answer

PM7200 cannot turnon


Pull cover check for fuses on the bord and replace with exact rating on the fuse.

Nov 18, 2007 | Marantz PM7200 2-Channel Amplifier

1 Answer

Marantz PM7200


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

Sep 23, 2007 | Marantz PM7200 2-Channel Amplifier

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