Question about Marantz Audio Players & Recorders

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Loud distorted noise from the output

Only on one side, sometimes loud hiss kinda sound sometimes really loud almost thunder like. Cables in good condition, source in good condition. If i only touch the amp it's enough to give a good noise. And when i turn it on it starts slowly building up. like there is something not getting warm? after a while it sounds ok but don't touch the amp. It's an old pm8000, have it for years now.

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  • Contributor
  • 40 Answers

Well it sounds like a solder pin is getting lose. does it happen when you rattle the vol knob gently? Maybe the potentiometer does also have to be cleaned

Posted on Nov 25, 2014

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Losing sound, hearing scratchy noise from the speakers

My yamaha tuner does this every few months. POwering down the receiver and rapidly turning it to full volume then no volume a dozen times clears the contacts on the volume potentiometer. The problem always goes away for another couple of months.

Posted on Apr 27, 2007

robotek
  • 1512 Answers

SOURCE: sony TA-540E TWIN DRIVE AMPLIFIER

Hi Jimbob. Sounds like you have dirty/dry controls/switches. The contact lubricant dries out on them producing intermittent and scratchiness when you operate them. Clean any offending controls or signal switches with CRC2-26 by squirting(to flood then internals) each control/switch. you will have to do this from the inside of the amp. You may also have a dirty speaker protection relay, sound may return to a dead channel when you turn the vol up points to that. Good Luck. If you need more info feel free to get back to me here. Happy to talk you through more if you cant sort it out.

regards
Graeme

Posted on Mar 22, 2008

robotek
  • 1512 Answers

SOURCE: Technics SUV4X new class A Amp - 20 odd years old but lovely sound !!

Hi guys

Quick check... If the amp still stays in safety mode with the vol turned down and the speakers disconnected, it will have failed in some way. Since you have the safety operation light ON, you can expect that the power transformer is OK. I would expect that you have a DC offset condition on one channel. The most common problems you may have are

  1. dry solder joints about the power stages such as regulators, and output/driver transistors/IC's.
  2. blown output transistors/output IC with possible fusible resistor failures, and or sometimes burnt up printed circuit tracks.
  3. a voltage rail failure from a burnt fusible or power supply component.
If you are up with electronic fault finding, soldering and have the tools, have a go yourself, I could talk you through it. If not, I would suggest you contact you local HiFi specialist and find who can repair it or at least check to see what has failed for you. Good Luck. If you cannot find someone, hit me back and I will try to find someone for you. Cheers

regards
robotek

Posted on Sep 06, 2008

  • 130 Answers

SOURCE: Hello I have a Technics SU-V45A amp, it's about 18

See there is a problem with the volume conroller as it is 18 years old the controller has worn out replace the volume controller with a new one and you will be able to enjoy great sound again

Posted on Dec 05, 2010

richroth
  • 9472 Answers

SOURCE: BACKGROUND I have a NAD 306

While capacitors may last decades on a circuit board, they're subject to age, manufacturing defects and damage from voltage spikes. Sometimes a bad capacitor will give visual clues you can spot with a careful look. If it appears to be good, you must still test it both in and out of the circuit. A defective or damaged capacitor will reveal itself when you check it with an oscilloscope or multimeter
.
Examine the capacitors on the circuit board. Normally, they should have a smooth, symmetric shape. If you notice cracking, bulging or dark streaks on the capacitor.

Examine the circuit schematic to find the power supply paths. Connect the oscilloscope to the circuit board's DC power by first connecting the grounding clip to power supply ground, then hooking the probe onto a point that has positive or negative DC power. Set the oscilloscope to DC coupling. If the oscilloscope shows excessive AC ripple or reads a below-normal DC voltage, an electrolytic filter capacitor probably needs replacing.

Disconnect all power from the circuit board. If the power has been on, give the capacitors a few minutes to discharge.

Posted on Jan 29, 2011

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The distortion you are experiencing could be due to a few things,

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The source from where you original sound signals came from,
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OR

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