Question about Audio Players & Recorders
Amp gone into "safety operation" mode - flashing amber light+no output.
Amp is connected to 1pr. 8ohm KEFS + 1pr. 8ohm CELESTIONS(correct impedance selected on amp). I had it on 3 of 10 ( loud amp - 65wpc ) and the output suddenly stopped and amp went to above mode. i switched it off and noticed the transformer was hot - although well ventilated. ive taken cover off and checked the 2 fuses i could see ( both ok ) + can see no toasted components.Do you think ive cooked the transformer or possibly the output IC?. As the unit will power up i dont think the Transf. is the problem - hopefully it could be other components that are standard service items - cheaper ones??!. Thank you if you can help me. A fellow Biker !!!!!!.
Quick check... If the amp still stays in safety mode with the vol turned down and the speakers disconnected, it will have failed in some way. Since you have the safety operation light ON, you can expect that the power transformer is OK. I would expect that you have a DC offset condition on one channel. The most common problems you may have are
Posted on Sep 06, 2008
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Posted on Jan 02, 2017
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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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