My amp turns on for like 2 seconds and then turns off. When i plug it in the wall, the fault and two temp displays blinks 5 times while the AC mains display stays on the whole time. When i go to turn the switch on the Fault display stays lit and the channel 2 Clip display turns on.
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First confirmed if your speaker and wire are not shorted.
Once it is in good condition then it has a big chances that you have a faulty output IC.
This is quite technical and I've advice to send it to qualified service center to isolate the problem.
This is fixable.
Thanks for using fixya.
Most 640As suffer from this sensitive issue. It is not a fault, but a protection mechanism that is too sensitive. In some cases, it could be due to the open ground earth issue or Left & Neutral reversed at the wall plug. Check your wall plug's connection and if they are perfect, then it could be because of a electrical issue inside the amp. In that case, get the technical support from CA to fix this.
hi, may be ur amplifiers any of the output channel have some problem. that's why it goes off after power on, protecting ur speakers. disconnect all the speakers and inputs and then power on it if works check ur speakers and inputs. if not there is fault inside ur amplifier. ok
Looks like the fuse blown.. or the classic symptom of electrical fault inside the amp. 640A uses a sensitive protection circuit often ends up in this irritating situation. Normally, there is nothing much you can do, but just check your wall plug connection for Open Ground or Left & Neutral reversed issues. If the wall plug is free of error, then you should better contact CA technical support.
If the amp is going into protect without audio passing it could very well be an internal short. In this case audio typically won't pass at line level. Have you tried turning the input gain stage knobs all the way down as well as the source material and slowly creep the volumes up? If it takes some audio before it faults you may want to double check the load you are placing on the amp's outputs. I'm assuming at this point it doesn't matter what speakers you are hooking it up too, it still crashed on you. Remember that Audio can be measured in voltage as well so you can measure the outputs of the amp with a volt-ohm meter.
replace all the electrolytic capacitors in the power supply. i had the exact same problem with mine and once i replaced the capacitors it powered up and stayed on and worked perfect. these capacitors tend to fail as they're of poor quality. this fault is very common on denon receivers, especially the later models.
The unit is going into protection mode. It has an internal fault that is forcing the unit to shut down to protect your speakers, and the amps internals to a degree. It is not something that can be easily diagnosed here. If it is a decent amp. then you may want to get a tech to take a look at it for you. If it is more than half the replacement cost of another amp, then it is not an economic repair job to do. UNLESS it is collectable/ What make and model is it? I could advise you. :)