Question about Audio Players & Recorders
There are many different types of "protection" that are meant to protect the amplifier. One is DC Protect, which means a damaged amplifier, Overload, which means the output stage is running too hot, etc. Think of this. All the amplifiers are basically the same, and here's the important part, there is one lead from each channel, that ties to the same line going into the microprocessor(computer inside, or a more simple protection circuit). Therefore, anyone of the amplifiers that has one of the issues above, will cause the entire amp to shut down. Another issue, it's very unlikely for the amplifier would overheat within 5 minutes. you may have yet another issue mimicing an overload issue.
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Posted on Aug 09, 2015
Hi try to unplugged your speakers directly to the ampli to test if you don't have a short circuit with the lines or the speakers. If the problem persist you have to go to a repair/shop.
Have a nice day
Posted on Nov 19, 2014
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Posted on Jan 02, 2017
You have basically the same problem as a chap with another amp on this site. So here's what I told him:
"You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good. "
Posted on Nov 24, 2009
SOURCE: Tecnics SU-G95 stereo overloaded
Power down,disconnect the speakers and power back up. If it still say's overload, it needs to go to service. If not, check your wires, connections, and speakers one by one to hunt down the problem and correct. Hope this helps
Posted on May 25, 2009
Are these resistors near or linked to whatever is on the heat sink? If they are then they are bais resistors and they have burned up due to a fault on the devices on the heat sink.
Resistors are cheap, all you need to do is find out what value they are. This is part of the colour code. However if they are burned then you might not be able to read the code! So you will need the circuit diagram or someone to tell you the value.
The problem however will be if whatever on the heatsink has gone!
It could be an IC since you have lost both channels, unless you have shorted the speaker wires of both channels somehow and blown both right and left amps!
Posted on Nov 27, 2009
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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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