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No output from Arcam Alpha A7 amp. Noise at speakers (varies with volume control so assume powerstage ok). Switching to phono input increases hiss so assume phono pre stage ok, but no output from ANY input CD/Phono/tuner/dvd. Power light on. amp has been unused for two months, other than that, no change. Any ideas gratefully received. Mike Blackwood E-mail nimrod2112@talktalk.net...are there any known faults....the unit is around 8 years old. Thanks for any clues!

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Receiver shut down only when using phono preamp

Since the protection circuit trips after 4-5 songs at high volume from LPs, it may be that the infra-sonic rumble common to phonographic recordings is driving your amp stages much harder than it sounds like they are driving. You can check this with watt meters for your speaker outputs, or by filtering such extremely low frequencies on the input. If you have an equalizer--especially an old one--it may have an infrasonic filter, or just cut the very lowest frequency available on the equalizer after running your phono pre-amp into the EQ and the EQ into your VCR2 input. This setup will verify if your problem is the infrasonic rumble, but I wouldn't use it as the solution. There are very quiet infrasonic filters available that would work better for the long term. And if you just cut the lowest EQ frequency out, you'll miss some good bass.

Posted on Nov 07, 2006

  • 3600 Answers

SOURCE: Hi ,Marantz SR7200 , i am getting an audible hiss

if your hooking up a phono input lead to a digital input lead it won't work analog and digital totally different setup. when you connect the leads up it just kills the input amp so there is no noise.

Posted on Jul 10, 2009

  • 4234 Answers

SOURCE: I have bought an used Nakamichi AV1 AVR. The unit

There is a switching IC inside this unit that may be the problem, but without seeing the actual unit and signal tracing, this will be near impossible to diagnose. If you have an oscilloscope, place an input signal on one of the inputs and trace the signal to the IC. It will be a TA9263 or something similar. You should see the signal on 2,4 or 6 pins. If you see the signal only on 2, then the IC is likely to be defective.

That would be my first attempt. Also check the power supply to that IC.

Keep us posted on progress.

Dan

Posted on Aug 17, 2010

  • 1 Answer

SOURCE: I have bought an used Nakamichi AV1. The unit

I also have an AV-1. I suspect you might be missing the pair of bridging pins (looks like a shiny u-shaped stubby nail) inserted between the center of the "Pre-Out" and "Main In" rca connectors on the back of the unit. There are two sets, one set of left and right each for the Front and Rear. Without these, you will get no output from the unit.

Hope this helps.

Posted on Apr 19, 2011

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hi,
I have the service manual of ARCAM AVR 200 with me. send me a mail on my mail id. I will send u the service manual. its a large file having a size of 4.8 mb. I can sent it through fixya.

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There is a switching IC inside this unit that may be the problem, but without seeing the actual unit and signal tracing, this will be near impossible to diagnose. If you have an oscilloscope, place an input signal on one of the inputs and trace the signal to the IC. It will be a TA9263 or something similar. You should see the signal on 2,4 or 6 pins. If you see the signal only on 2, then the IC is likely to be defective.

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