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I have just had some work done on the sky system, and shortly afterwards "protect" appeared on the Kenwood system, as all the sound comes thruogh it this has blocked it from working. Is there a common password to unblock the system? Thanks Andy

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Hi slogga

Try unplugging the unit from the wall for 30 mins then plug it in and try again. This process is called a hard reset, where the whole system does a reset. Let me know how you go.

regards
robotek

Posted on Jun 22, 2008

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Sony STR DE835 receiver - no sound from speakers and headphone jack


The problem is in the audio output semiconductors, they have shorted causing the fuses to blow and it is in auto protect mode to prevent further damage. I recommend a professional to assess.

Mar 10, 2012 | Sony STR-DE835 Receiver

1 Answer

My stereo sysytem is a mini stereo: serial number 10200055. It currently says "protect", what is this and how do we return our system to normal operations?


Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:
  • If Protect message appears when turning volume up, then stereo unit itself has an internal fault
  • If no Protect message appears, then suspect the speakers may be causing the issue.
  • Reduce volume and turn unit OFF
Re-connect speakers (ensure the connections are secure), turn unit ON:
  • If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

Sep 04, 2011 | Kenwood Audio Players & Recorders

1 Answer

Kenwood kr-v888d after "ON", through 3sec.


Generally speaking, an amp attempts to protect 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.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 18, 2011 | Kenwood KR-V5580

1 Answer

System turns off and flashes "Protect"


Hi, you have a short somewhere along your speaker wire. When the receiver goes into protection mode, it shuts itself down so you don`t blow your on-board audio amp.

If you see protect come up on your Receiver, you have got a short somewhere. What`s happening is your receiver is sensing an overload somewhere in your system and if it does not go into protection mode and shut down , there will be permanent damage done.

You will need to check the speaker wire if it is not bridging somewhere or sometime else..

Have a nice day..

Feb 18, 2011 | Sony STR-DE575 Receiver

1 Answer

I own a kenwood surround sound system (VR-606) when i turn it on then in 3 seconds it shuts off then the power/standby button flashes, any idea of whats wrong?


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output 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 hands-on tech.

Feb 05, 2011 | Kenwood VR-606 Receiver

1 Answer

I have a Sony STR-DE845 5.1 Channels Receiver and it has been functioning flawlessly for years. Recently though, it has started producing a loud "pop" sound within a minute after turning it on....


You probably have a discrete component failing inside it.


Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output 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 hands-on tech.

Dec 22, 2010 | Sony STR-DE845 Receiver

1 Answer

Kenwood RV300 is flashing "PROTECT"


the amp has gone into protection mode .but you knew that. the reason would be a crossed speaker wire. like fuses the polar switch opens when the cables touch /cross and is made to reopen when the cross it rectifyed disconnect all speakers stand the unit alone see if it powers up then. if not let me know

best of luck

Dec 08, 2010 | Audio Players & Recorders

1 Answer

When I switch on my Kenwood A-722L all the lights start flashing and 'PROTECT' appears on the display. Any ideas?


You have an amp failure, this can be a problem with a speaker but is more often a shorted output channel.

You can check to see if it is a speaker by disconnecting the speakers and then turn it on. If it goes into protect again, you have a shorted output channel. If it turns on, you may have a bad speaker.

If it turns on, try connecting one speaker at a time until it goes back into protect. When it goes into protect, you just found your bad speaker (last one connected).

Make sure you turn it off before connecting a speaker. Then turn it back on again. Do this for every speaker you have.

If it stays in protect, you should take it in for service. Unless you have the proper tools and experience working on electronics there is nothing you can do to repair this yourself. I have seen many people try who were not qualified to work on electronics, and more often than not, they cause more damage than they started with which results in a more costly repair.

Let me know if you need any more help.

Dave

Jul 02, 2008 | Kenwood Audio Players & Recorders

1 Answer

Kenwood VR-5090


Probably an issue with the switching power supply or possibly a shorted output. There are various protection circuits that will cause that. Most suspect is the SMPS (switch mode power supply) fault detection. (Check your output for a short though, i.e.shorted speaker wires)

Nov 10, 2007 | Kenwood VR-5900 Receiver

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