Question about Yamaha DSP-AX1 10-Channel Amplifier

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Loss of sound and memory settings

I have a Yamaha DSP-AX1 Amp purchased Aug.2000 with the following problems

 When I first switch on the amp the memory settings are lost and defaults loaded ie all speaker levels set to 0db etc. The display shows a volume level of 60db, LD selected as the input, Concert Hall 1 selected, and no main speakers are on. I have to press the 'SPEAKER A' button on front of amp and go through the menus to set up all user options (speaker size,levels,graphic eq, DTS settings etc),also have to select 'LEVEL' button on remote to adjust volume level of each speaker as required.After these are re-entered I need to select the 'TEST' button on remote to check actual volume level of each speaker by using the test signal, and usually the rear left surround is low or no volume, the main right could be the same and one or both of front effect speakers could be low or no volume. I then swtch the amp off/on a few times by the remote and test each speaker again. This I keep doing until all volume levels are OK. If the volume levels are low just by leaving the amp 'on' and checking the volume levels they will correct themselves. Othertimes when I switch the amp on for the first time the memory settings are OK but the speaker volume level problem is still there and I go through the process of switching amp off/on by remote and checking. Dont know if I have 1 or 2 problems with amp or if they are related.Have changed the remote batteries and pressed reset as described in manual. Any advice would be appreciated. Thanks in advance.

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Re: loss of sound and memory settings - Yamaha DSP-AX1 10-Channel Amplifier Amplifiers & Preamps

Just throw it away and buy a new one.

Posted on Oct 19, 2007

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The sound of the LEFT MAIN Cannel disappears on my YAMAHA DSP AX-1

The fact that sound appears at max volume means that it is getting past and through the pre-amp stage. So it would appear to be in the main power amp stage the problem. It would depend what drives the channel, but if it's transistor driven I would suspect one of them.

Oct 31, 2012 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

Yamaha DSP-AX1 ,. When turning on it only stays on about 4-5 sec. then shut off. Bob

Is this new equipment or a new problem on working equipment?

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See Troubleshooting Page 79

Impedance Selector in between settings

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.

Apr 07, 2011 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

Fails to switch on but a clicking noise is heard when power button is pressed.

Sounds like the protection relay for the speakers constantly activating,indicating either a short circuit or high bias current on the amp power supply. A qualified tech would be able to say easily with the right gear

Jan 02, 2011 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

Hi my amp when i switch it on within 3 seconds it automatically switches off?

That's the protect circuit kicking in.
The rec'r will require service. Either a couple of power supply capacitors have gone bad or one of the power amp modules has quit.

Nov 02, 2010 | Yamaha DSP-AX1 10-Channel Amplifier

2 Answers

My yamaha DSP AX1 amp does not work when audio is connected via optical or coaxial any suggestions how to correct this. no sound comes from any speaker except the subwoofer.

Are all the speakers turned off (set to None) in the speaker menu.(except the sub)?

2 channel direct analog stereo may still work, but any surround modes will use the speaker settings and the full DSP digital section.

Check also the input mode isn't incorrect - although if the sub is wired correctly and gives sound this can't be whats wrong.

Aug 26, 2010 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

The relay switch clicks but does not power up my yamaha emx300 pa amp/mixer.

I have one like it in my shop

The main power transformer has gone bad

Yamaha has them in stock

Aug 04, 2010 | Yamaha DSP-AX1 10-Channel Amplifier

1 Answer

Audio thump on changing any parameter

My bet is a faulty electrolytic capacitor! Don't know which. but would look around the circuit of those stages.

May 30, 2009 | Yamaha DSP-AX1 10-Channel Amplifier

2 Answers

B speaker doesnot get on.

apply a good contact cleaner in this button and press it many times.confirm good connection between amplifier output and speaker b.connect speaker A insted of speaker B if it is working the problem will be in cabel and speaker B if not the problem in your amp output stage.

Mar 08, 2008 | Yamaha DSP-AX1 10-Channel Amplifier

2 Answers

Very low sound in main left chennel.

disconnect the cabel of left channel from your amp disconnect the cabel of right channel and put it in place of left channel if the problem goen your problem is in left speaker itself (cabel or speaker).if the problem excit the problem will be in amplifier output stage

Jan 28, 2008 | Yamaha DSP-AX1 10-Channel Amplifier

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