Question about Sony STR-DE335 Receiver

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Says "protected" & will not work - Sony STR-DE335 Receiver

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  • Sony Master
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Disconnect all speaker wires then turn the receiver back on. If "Protect" does Not come on, re connect your speaker wires one by one, making sure all braids are twisted neatly and no longer than 1/2". Then turn the receiver back on after each speaker is connected to test. If all speakers are re connected and the receiver still plays, you got it! problem solved! (this is the most common problem) it happens to us all!. Now, if the receiver immediately goes into protection with all wires disconnected, it would actually be about the same cost to replace the unit as repair. Avg repair between 125-175. Hope this helps. If you have any more questions with troubleshooting, post a comment and I will help some more

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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1 Answer

NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

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is' protect 'appears on display?.remove speakers & check again.if then set work without error check speakers & cable. protect appears again there is a problem with power amp module.

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Autotek XS-900.4 stuck in protect mode


Hi.

The amp does not go on protection only because of wiring or power source problem , but also and mainly when there is an internal fault.

Protection is started whenever an out-of range voltage value is detected from the controller circuit.

Protection can be triggered from a burnt final IC or from a speaker wiring problem.

Since you have ruled out speake, wiring and power source problems, then this Amp is probably defective

If the Amp works fine on a different vehicle, then protection mode may start either because speakers impedance is not within Amp specs, or because the amp has a too big power draw. In this last case the problem is fixed installing a capacitor on the Amp 12V line.

Regards.

Ginko.

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1 Answer

After playing for a while my Sony Surround Amp cuts off and shows a PROTECT Reading in the window.


Sounds like the amp is protecting itself from an over-current situation.
This happens when the machine has to try too hard to get sound out to the speakers.
There are several possible reasons.
You may be using the wrong impedance speakers for the amp.
-some amps only work with 8ohm speakers
-some only work with 4ohm speakers
If you have a short circuit in the speakers or in the speaker wiring, that could cause the amp to overwork and go into protection.
If you connect up multiple speakers to the same single output of the amp you effectively short out the amp and cause it to overwork also.
Before troubleshooting, blow out the amp, dust inside can cause lots of problems with the electrical systems. Use canned air and do it outside with fresh air.
To troubleshoot :
1. check to see that the amp and the speaker have the same impedance number, either 4 or 8ohm. This is usually printed on the back of both. If they do match go to step two.

2-unplug all the speakers, add one speaker(left one) and test it for awhile to see if it goes into a protection mode. Next move that same speaker to the right side output and run it for awhile to see if it goes into protection mode. Repeat the test with your other speaker, moving it to both outputs(L&R) to check if it works. If the amp fails with either speaker on either output, you may have a mismatch of speaker and amp or a bad amp. If you have only one speaker that causes a protection, then you have a bad speaker or it's wire. If both speakers go into protection, get different speakers and test again. if it works for all of these tests, go to step three.

3.hook up both the left and the right speakers to the amp. be sure that the wires are stripped cleanly and twisted tightly, if you have screw on outputs that is. Test for proper operation. At this point you should know if there is a single speaker causing the protection or if it is a amp malfunction.

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might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.

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Hi i am matt


If the protection LED lights only after the remote voltage is applied (head unit is switched on), the amplifier likely has shorted output transistors. If the protection LED remains lit without remote voltage applied, the amp may have other problems.

Does the protection LED light with no speaker wires connected to the amp and no RCAs plugged into the amp?

Jun 22, 2008 | Car Audio & Video

1 Answer

Problem with amp...


In virtually all instances where the protection light is illuminated, the amplifier has gone into protection because the output transistors are shorted. To eliminate external wiring problems do the following.

Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still goes into protect, the amp likely has blown output transistors.

If it does have blown outputs, it's is likely due to the speaker wires shorting together when the woofer was out of the vehicle.

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VB101PK REV 13, AMP WITH SUBWOOFERS


was the amp hooked directly to the box? You probably rattled the power connections from the circuit board like I did on a PT 800 watt amp.but check amp fuses first.

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1 Answer

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