Question about Onkyo TX-SR500 Receiver

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No power AMPLIFIER PROTECTION HASBEEN ACTIVATED

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  • Otto14 Feb 18, 2009

    After pressing the Power switch, the display lights up and immediately goes dead. I have no speakers or components connected to the receiver.



    According to my manual, the Amplifier Protection Circuitry has been activated, and only remedy is to contact an Onkyo Svc Ctr. I requested assistance with the problem on the Onkyo website 3 days ago, but they have not yet contacted me.



    Can I fix the Amp Protection Circuitry myself?

  • Anonymous Mar 02, 2009

    turn on the power and the receiver shuts off a second later.the standby light flashes.manual said amplifier protection circuit activated contact onkyo service center.called 1 8002291687 pressed promp #3 then got hung up on without even talking to someone.

  • rporter556 Apr 13, 2009

    I have the same problem. There are no wires touching. It will do it with nothing hooked to it.

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My receiver has a similar problem. So far I have found a pair of output transistors fried shorted E to B to C (Q6051 and Q6061) and the associated ceramic current limiting resistor array (R6101) failed open. These bad components will definitely be sensed by the protection circuitry as an overload condition. I ordered some replacement transistors from Mouser (2STC4467 and 2STA1694) and the resistor (RSS2WK-0.22 ) from Encompass.

https://www.encompassparts.com/

I will let you know if this corrects the problem once the parts are installed. I also got a service manual from www.user-manuals.com which helps a lot.

Posted on May 02, 2009

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Check your speaker cables are not touching at the back of your amp or speakers.

Posted on May 27, 2008

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1 Answer

The volume level was left very high and was turned on several times and turned on by a child. The protection circuit worked each time.


Defective Audio Output device.
The output transistors are shorted, whether they are discrete or included inside a part called a stereo amplifier.
This 'dead short' is causing the protect circuit to turn off the relay.
The two clicks are, one click on, and then one click off.
Find someone who can replace the outputs.

Feb 02, 2015 | Audio Players & Recorders

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How do i eliminate amp protection. Unit goes no further. Tried to unplug the unit & plugged back in but problem persists. Please HELP!!!!!


This is a very ambiguous post. When you say that you are having this problem, what are you doing? Please post all the steps that lead to this error. There is no way to disable the amplifier protection circuit. If it senses a short (which could be a bad speaker) then it will be activated.

Dec 12, 2014 | NAD T748 Home theater receiver with...

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Hello my sony audio/video control center #STR DE335 is in PROTECT MODE.. and i cant listen to it..can u please tell me whats wrong?


PROTECT display indicates that receiver got serious problem in output amplifier section and protection mode is activated to avoid further damage.
Output amplifier section should be tested by qualified technician to find out and replace defective part(s) to solve this issue. Local repair shop will do this job as it is not user level repair.
Thanks.

Apr 29, 2011 | Sony STR-DE335 Receiver

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My rx-v367 does not power on, i think the protective circuitry has been activated. How do I reset it?


hi,

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong. Is there is any standby light. If not check the AC fuse.
Normally AV receivers show this when any of the output amplifier get some problem. there are five 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.

First of all remove all speaker connections from the amplifier and powerup the amplifier. If the amplifier turns ON then, then any of the speaker have some problem.
If not 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

Feb 17, 2011 | Yamaha RXV367 Receiver

1 Answer

Power button turns green, flashes and then turns red and flashes.


Hi,
While working it stops and flashes red approximately 2 seconds interval

Causes
Protection circuit is activated depending on the temperature of the surroundings

Remedy
Switch off the power supply and power on after the temperature have reduced.


While working it stops and flashes red approximately 0.5 seconds interval

Causes
1.Using speakers having less impedance than the specified.
2.If speaker core wire touch each other Protection circuit is activated


Even applying power red flashes 0.5 seconds interval

Cause
Amplifier circuit has failed

Remedy
Switch off the power and contact denon service centre


Thank You

Sep 07, 2010 | Denon AVR-789 Receiver

1 Answer

My receiver will not turn on and the red standby light flashes. What is wrong?


Flashing standby light shows that protection mode is activated in receiver because of some problem in output amplifier section.
Please check output amplifier section and replace defective component to fix the issue.

Jun 17, 2010 | Aiwa AV-DV75

1 Answer

Amp protection circuit has been activated


1-check your input cables from connected equipments(cd player or dvd p
layer or any other media source).
2-adjust your input signal level(from-10 db to 0 db).
3-amplifier power must be bigger than total power of all loudspeaker with 20%----(if total power of loudspeaker is 8 watt amplifier must be 10 watt.

Nov 28, 2009 | Onkyo TX-SR605 Receiver

1 Answer

Power will not stay on


Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage.
Either you have a short in your speaker wires, in your speakers, or a blown amplifier.
Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).

Apr 21, 2009 | Onkyo HTR500 Receiver

1 Answer

Onkyo Tx-v940 Receiver/Amplifier Protection Mode


Audio amplifier IC's damaged you need to change it.Good luck

Dec 31, 2006 | Onkyo TX-V940 Receiver

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