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My amplifier getting protect what shall i do?

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  • Anonymous Mar 19, 2009

    set goes to stand by mode

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  • 105 Answers

You have overloaded it. Check your wiring to make sure you are not shorting anything out. Check your speakers' ratings and make sure they are not less than 8 OHMS or reduce total number or speakers being driven. A 500 Watt receiver should easily drive 6 80-100 WATT peak speakers @ 8 OHMS.

Speakers with less resistance (6 ohms and lower) require more power to drive and therefore increase the load on the amp, which puts it into PROTECT mode so you don't blow the circuitry. Do not drive a subwoofer with the same amp as the main speakers. Be sure you are using home audio and not car audio speakers. Use larger speaker wire (16 gauge or lower).

Posted on Apr 03, 2008

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Hi I have a Sony MHC-EC99i when I plug in the power cord it show "Protect" even I had nothing is connected to the unit,what shall I do now ,thanks.


If it's showing 'Protect' without any Speakers connected then you've got a fault with the Amplifier.

Depending on your Technical ability you could remove the outer case and have a look at it yourself. It could just be blown Capacitors on the Amplifier PCB or could be worse and require complete new PCBs if they are available for this model.

Jun 06, 2011 | Sony MHC-EC99 Audio Shelf System

1 Answer

My reciever keep saying protect and i cant hear nothing


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

May 19, 2011 | Sony STR-DE598 Receiver

1 Answer

Receiver flashes protect on screen


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Mar 08, 2011 | Teac AG-V8060 Receiver

2 Answers

The display just reads "protect"


Protect is bad. It means the amplifier thinks it is overloaded. Check the speaker wires to make sure there are no loose connections or shorts.

Mar 01, 2011 | Sharp CD-BA2600 CD Shelf System

1 Answer

How do i get my Kole audio qx4-720 amp out of protection mode


be sure the master volume is in minimum some amplifier has protect circuit when the volume exceed the maximum sound level to protect circuits from damage. try to disconnect speakers maybe one of them are shorted already

Feb 02, 2011 | Kole audio QX4720 Car Audio Amplifier

1 Answer

How do i remove protect mode


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Noramlly AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Jan 30, 2011 | Sony STR-DB790 Receiver

1 Answer

Protect mode


Protection circuit.
Checek the wiring of the amp and speakers, don' forget to look for shorts at the speakers. Make sure no wires are touching each other

Apr 30, 2010 | Volfenhag 1600 WATT CHROME AMP AMPLIFIER 2...

2 Answers

What shall do if my kenwood show me protect?


Hello. It could be helpful if you would give us the exact model number of the Kenwood product you have. Kenwood has made many products over the years. While it's unlikely, your Kenwood product could be the subject of a recall or repair for this problem.

If it is not, please start out by checking your speaker wiring. If you have a short or bad connection, this can cause the amplifier in your Kenwood product to shut down as a way of protecting itself.

Check your speakers as well. Make sure all of them work. Also check the impedance printed on the back of each speaker. Compare it to the ratings printed in the Kenwood manual.

If none of this helps, and you do not find a problem, your Kenwood product may require repair. "Protect" is how the microcontroller inside the receiver is trying to tell you that something is wrong and if the unit did not shut down, further damage could result.

Apr 17, 2010 | Kenwood VR-509 Receiver

1 Answer

How best should a speaker be place in big church auditorium


Main speakers shall be placed in front (left and right)
Satellite speakers shall placed at the front and right
sides until the end of the big church auditorium. spaced
at 10 meters apart.

Oct 22, 2009 | Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2...

1 Answer

Protect error


Hi,

If your amplifier goes into the protection, there's really something wrong. There are different kind of protections but usually that circuit does see a DC voltage on your speakeroutput.
So it's a protection for your speakers.

regards,
Gerard

Jan 31, 2009 | Audio Players & Recorders

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