Question about Yamaha DSP-A1 Receiver

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DSP-A1 Power Off

My DSP-A1 is powered off when I put the volume up (between 1/4 and 1/2) after many years, having the same configuration, including wires, speakers and units attached. Configuration: B&W Front, effect and center speakers (large). Niles as rear speakers. I have attached: DVD Audio unit, CDRW recorder, LD/DVD Player, MD Player, Phono turnover, VCR, TIVO, DIRECTV. All wires are MONSTER CABLES.

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The A1 has an internal self diagnostic program which you can go through to find the fault. You can access the diagnostic program by simultaneously pushing some buttons on the front panel. The Yamaha service manual for the A1 tells how to do it and what the diagnostic codes mean. You can get a copy of the service manual on the web from several suppliers for a small fee.

Posted on Jan 20, 2008

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I am no expert but i had simmilar problems and it turned out that some capacitors needed replacing

Posted on Nov 18, 2007

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All you have to do, check all your speaker terminal and tighten it

Posted on Sep 26, 2008

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Posted on Jan 02, 2017

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Popped power supply hi sorry if you can't get it on trying to do a diagnostic won't matter if you can open the back check where the power is going into you will c a power supply board a cap has carrots on it check if any of them is popped up

May 20, 2012 | Yamaha DSP-A1 Receiver

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You had a post that said you had fixed faulty power relays on DSP-a1 - how do you identify the relays that need cleaning?


That your amp does not go into the second stage of powering up indicates a fault which is causing it to sit in non-active mode. This could be due to blown output audio module or transistors or a fault in the safety circuit itself. It is not a fault the non-technician can repair and it would need to be sent to an authorized workshop.
I have seen situations where users unknowingly leave frayed ends of wire shorting across the speaker output terminals which can lead to this sort of fault. You could check this out also.

Oct 28, 2011 | Yamaha DSP-A1 Receiver

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My Yamaha DSP A1 after switching ON goes OF itself after 2-3 seconds! Please give me advice what to do Thanks, Alex


Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Yamaha-DSP-A1-Amps-manual/id/319ag811/t/2/

See Page 73 Troubleshooting.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Mar 06, 2011 | Yamaha DSP-A1 Receiver

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Have Problem With Yamaha DSP A 1. power does not come on...after repeatedly pressing the on switch it comes on and then works fine ..most of the PSU cold solder prob solved...what could be the possible...


Either the power switch is shorting out, or you could have a faulty or somewhat faulty resistor or capacitor on the power board. You can test them with an anlalog meter. Each component has an imprinted number on it to determine it voltage and ohm rating. That number should match the number on your tester.
Some units also have relays in them. The little square plastic boxes. You can test these with an ohmmeter but you would likely have to pull the circuit board to test the relay from the solder joints on the bottom.

Jul 29, 2010 | Yamaha DSP-A1 Receiver

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No sound from center channel


If you have checked the speaker and wiring. Check the setup, the center channel could be off or it's not in a surround mode.
When playing a DVD through the receiver are the voices heard clearly in the front speakers? if so the center channel is turned off.

Oct 21, 2009 | Yamaha DSP-A1 Receiver

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In the manual it says switch off leave for 30 seconds and switch back on .

Aug 07, 2009 | Yamaha DSP-A1 Receiver

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Pop from speakers when using dolby digital mode, works fine when not using any processing mode


Over 10 years old? Could be bad capacitors... if you have the expertise, you can try taking it apart and checking them with capacitance and ESR (equivalent series resistance) meters. Otherwise, you can try to see if any capacitors are exhibiting any "bowing" or leaking; if the top of the capacitor is bowed or puffed out - even slightly - or if there is a brown or white residue around the base of the capacitor, you can guarantee the capacitor is bad. Note that not all bad capacitors exhibit these physical attributes... but you can be sure a good capacitor won't.

If all of this sounds too complex, your only recourse will be to take it to a reputable electronics service shop.

May 26, 2009 | Yamaha DSP-A1 Receiver

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