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Marantz SR-8200 standby power problem - Marantz Audio & Video Receivers

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  • boogiesnake Oct 20, 2008

    When the amp is switched on, the standby LED is green although the unit remains dead. The standby 5v is present but the CPU does not feed the required 5v supply to the main PSU relay which switches power through to the main transformer.

    The CPU does, however, pass a 5v supply to the standby led's 'on' transistor which makes the LED green instead of red - strange. I would have thought the CPU would force a red stanby led on detecting a fault. Any thoughts before I force the PSU on and see what smokes - a method I used to use in TV design but I'm not keen on testing it out on anything I've paid for myself.

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6 Suggested Answers

Duncan
  • 218 Answers

SOURCE: Marantz SR 7200

Sounds like it is zapped (fried outputs). Time for a trip to the repair shop. Good luck.

Posted on Jan 29, 2007

SOURCE: Marantz sr 500 going to "protect" mode when on.

Change the audio amplifiers IC´s because are on short circuit

Posted on Oct 02, 2008

Duncan
  • 218 Answers

SOURCE: marantz SR 7200

Most often it is due to improper speaker loading. In other words, it needs to have from 4 to 8 ohms speaker load and you wired your speakers in parallel when they should have been wired in series. What would have been an 8 ohm speaker load in series, turns into a 2 ohm load when in parallel. And with dual voice coil speakers you just compound the problem. And don't even get me started on bridged outputs.
Anyway that is what usually causes an amp to fry. Good luck.

Posted on Nov 11, 2008

killer_clown
  • 86 Answers

SOURCE: NO POWER - MARANTZ SR-5000

you mite not have to reset it, try checking ur fuses, it could of triped the cicrut when the power went out, normaly thats what happens unless it was a direct contact then, u mite wanna go get a nother receiver, and what i mean by direct contact, i mean like directly pluged into the wall
hope that helps

Posted on Feb 13, 2009

  • 1 Answer

SOURCE: Marantz SR 7200

It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault.
I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage.
Good luck.

Posted on Mar 29, 2009

  • 169 Answers

SOURCE: Marantz SR-18EX Loses Memory and Has Distortion on Center Ch.

take the case off (Carefully of course) and look for the watch battery, replace it, and unless something is gone in the memory itself, enjoy!

Posted on Aug 17, 2009

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Marantz SR 7200


Most often it is due to improper speaker loading. In other words, it needs to have from 4 to 8 ohms speaker load and you wired your speakers in parallel when they should have been wired in series. What would have been an 8 ohm speaker load in series, turns into a 2 ohm load when in parallel. And with dual voice coil speakers you just compound the problem. And don't even get me started on bridged outputs.
Anyway that is what usually causes an amp to fry. Good luck.

Aug 03, 2008 | Marantz SR-7000 Receiver

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Marantz SR 7200


It is likely that the PA stage has developed an offset voltage in the output stage. The faulty amplifier channel can be found by progressively disconnecting the collectors of the of the power transistors until the protection fault disappears. Once the faulty channel is found the the cause of the offset has to be traced to the faulty transistor or resistor. Don't forget that if you can smell smoke or burning then there are likely to be components(esp transistors) that have been damaged by the fault.
I had a Luxman unit that destroyed 5 transistors in the output stage that was due to an open .5W resistor in the driver stage.
Good luck.

Jan 29, 2007 | Marantz SR-7200 Receiver

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