Question about Audio Players & Recorders
Hi and welcome to FixYa,
Initially, based on your description, an internal electronic failure most likely in the preamp and/or the amplifier stage. this is of course assuming that you have tested and eliminated that the speaker and its wiring maybe at fault. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.
Posted on Dec 04, 2008
The fact it only occurs when you put audio through it at any level from the mic would tend to indicate that the output stage of the amplifier is faulty. There may also be a fault with the speaker system that could also produce the same symptoms. The protection circuits work in up to 7 different ways relating to current draw, DC offset, Thermal conditions present, or inaccuracies between input and output from the power amp stages.
Checking the speaker system/cables with an ohms meter will give you a quick test to see if there is a problem there with a short circuit. Try another speaker connected to the amp may also help you to eliminate that end of it.
Otherwise, most probably when audio from the mic is amplified, there is an electronic fault is producing a DC voltage in the output stage,and firing the protection circuit. This problem is often caused by failing solder or cracked/dry solder joints in and about the output stage. This is where I would start to look for problems. Happy to talk to you further about the problem.
Posted on Dec 04, 2008
If an amp protection circuit kicks in at volume level changes, the problem is usually in the pre-amp stage. What is happening here is that there is DC voltage being presented to the output stage. That is detected by the protection circuitry and is causing the shutdown. Normally, these amps are designed as cap coupled to filter out any lingering or transistional DC from stage to stage. If the coupling cap has shorted or is leaky, this type of symptom can occur.
Any service shop that works on audio gear should be able to trace this problem with a scope and resolve it quickly and cheaply. Expect a parts cost in the $10-$15 range.
Posted on Dec 04, 2008
Sir, did you try to check your settings of your device?
Posted on Dec 03, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
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(North American and Taiwan models) You can connect speakers with an impedance of between 6 and 16 ohms. If you use speakers with a lower impedance, and use the amplifier at high volume levels for a long period of time, the built-in amp protection circuit may be activated.
The STANDBY indicator flashes red
The protection circuit has been activated. Remove the power cord from the wall outlet immediately.
Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and set the volume to maximum. If the AV receiver stays on, set the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your Onkyo dealer.
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.
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