Question about Marantz SR6001
Arrived home and turned tv, marantz amp and foxtel on to watch a good night's viewing. There was a loud noise then everything switched off. I checked all the plugs, wall switch okay, power board with trip switch does not seem to be working anymore. Changed power adaptors and turned everything on again and everything seemed to be working fine, tv, amp, speakers, foxtel. A few minutes later the amp switched off and went to standby. It keeps flashing on standby and there no display on the amp window. Couple of times turned amp off and few minutes later turned it on again, then turned the input selector dial, there is a short display on the amp window then everything goes blank and just keeps flashing standby again. What is wrong and what can I do to fix this problem?
This unit went into protect either due to overcurrent or dc detect. There is no way to disable protection that Marantz or Authorized servicers are allowed to give out. The early versions of this model all you had to do was unplug for a few minutes then plug back in and unit if it did not have blown amp unit would powerup and work fine. But if amp had failure it may cause more parts to fail so they changed software to not allow users ability to disable protection. Send to Marantz Authorized servicer for them to check for amp failure or mayby they just have to disable Protect Mode.
Posted on May 28, 2009
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Posted on Jan 02, 2017
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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.
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