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How to do the work to fix it

This is a safety feature and can not be shut off. The system is detecting a problem in the last output stage of the amplifier and is shutting down to prevent further damage. I suspect a bad coupling capacitor in the pre-amp stage. This is a relatively simple repair for an experienced servicer. Figure on $10 or so for parts plus the local labor rate.
Dan
you said that but where is all this stuff. i dunno how to do any of that is there anywhere that i could take it or tell someone that can fix it

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Any service shop should be able to repair your machine. I don't know where you are located and am prevented by Fixya rules from pointing you to a specific referring you to a specific servicer. This type of problem is common and should not be difficult for anyone with experience. If you can provide me with the specific model, I should be able to list the probable defective parts.
Dan

Posted on Jun 04, 2008

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I can not open my aiwa digital 40


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Jul 03, 2012 | Aiwa Audio Shelf Systems

1 Answer

Philips MCD702 Shelf System no sound


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

Jun 26, 2012 | Philips MCD702 Shelf System

2 Answers

My stereo says protect


The audio output stage is shorted, the microprocessor ic is locked up, you have at least two problems, I suggest you get it checked out before any money is spent.

Apr 16, 2012 | Sony MHC-EC98Pi Shelf System

1 Answer

It's not coming out of stand-by mode.display shows only stand by mode. non of its function is working.


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition.ALSO if there is no action the processor should be checked for the parameters.

The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 22, 2011 | Aiwa JAX-S5 CD Shelf System

1 Answer

Wont turn on


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 13, 2011 | Sony LBT-D670AV Shelf System

1 Answer

No adio out


It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Jul 11, 2011 | Sharp CD-BA250 CD Shelf System

1 Answer

I HAVE AN XLMP60 SHARP SYSTEM, ITS IN PROTECT MODE, WHAT CAN I DO?


Hi

If the unit is going into a protect mode, the first thing to do is test the unit with no speakers connected, if it still goes into protect this means that Dc is being detected on the output stage, usually meaning that there is a short circuit on the output stage, therefore the unit needs to be repaired, if it tests find without any speakers connected then either the speaker/s are short circuit or the speaker wiring is short circuit either positive to negitive or positive down to earth, i.e frayed copper wire touching the units casing.

regards

TechSupp12

Dec 11, 2010 | Sharp Multi-System Mini Component System...

1 Answer

Stereo goes into protect mode


Protect is a safety feature so that you do not blow your speakers. However with it hooked up with the computer you may have surpassed the max output. If it still does this with out going through the computer, it has been damaged.

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1 Answer

Power shuts off


The unit is in "protect" mode. Basically a problem is detected in the last output stage of the amplifier section and the unit shuts down to prevent further damage. I suspect that you connected too many speakers to the system. The impedence load was too low for the amp section to handle and one or more output transistors have failed. This should be a straightforward repair for any local repair shop. Figure on $20-$40 for parts plus the local labor rate for the repair. I am not familiar with your specific model, but these shelf units are all similar in design. I will try to locate the service manual for this one to get you more details.
Dan

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1 Answer

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This is a safety feature and can not be shut off. The system is detecting a problem in the last output stage of the amplifier and is shutting down to prevent further damage. I suspect a bad coupling capacitor in the pre-amp stage. This is a relatively simple repair for an experienced servicer. Figure on $10 or so for parts plus the local labor rate.
Dan

May 22, 2008 | Audio Shelf Systems

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