Question about Marantz PM7200 2-Channel Amplifier

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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 the problem is not with the speakers as I tried using a different set of speakers. I took the amplifier to the shop for repair but they said they found no problem with it. So I brought the amplifier back home, set it up, ckecked all the connexions but I still experience the problem. What can I do? Thanks in advance.

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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!

Posted on Mar 15, 2011

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Marantz pm7200 makes loud crackles and cuts out for 1st 30mins and then is ok!


One common explanation is the capacitors fail after a number of years. The lineage of these electrolytic caps usually last about 10 years or so with regular operation.

This is a disappointment and many PC's, top of the line receivers such as yours 10-15 years old are plagued with these failing capacitors.

Suggest if you are DIY replace all electrolytic. If not look for a electronics repair local and get an estimate.

the repair manuals are available.
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The capacitors does not have to leak to fail. Also check for open/cracked solder joints around the power supply and power amps.

I have repaired several PC's and receivers for these defects with only an inspection lamp and multi-meter.

Purchasing a used replacement of the same age will likely require similar repair. Some older units are more reliable?

Good solder skills are critical and if you DIY practice on scrap boards before attempting.
hope this helps?

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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.

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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.

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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

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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

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

Kev

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

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

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