Question about Harman Kardon AVR 35 Receiver

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I turned on my receiver, it came on and immediately switched to protected. It is in an av cabinet and may have over heated but it has been off for several weeks and feels cold to the touch.

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First, unplug it from any power source. Then without moving the unit itself from it's current position in the cabinet, get a view of the back panel. Paying special attention to the speaker terminals, carefully inspect each one. They all should be tight, clean and with no stray strands of speaker cable. Then inspect the opposite end of each cable and terminal at each speaker.

A loose or broken connection or one with a stray piece of wire is a common cause of triggering a modern day receiver to enter into protect mode. Over time the copper speaker cable will corrode, become brittle and then if the unit or any of speaker cables are moved or stressed in some other way they can break. When that does happen it causes the amplifier to short circuit at the terminal or on the chassis.

Posted on Mar 21, 2011

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I have an Onkyo TX-SR506 that does nothing but blink a red light when plugged in. This happened after a power-surge from a lighting storm hit it. Is there any trick or magic key command to get it out of...


Page 90 of the manual describes the procedure for resetting it.

"If you can't resolve the issue yourself, try resetting the AV receiver before contacting your Onkyo dealer.


To reset the AV receiver to its factory defaults, turn it on and, while holding down the [VCR/DVR] button, press the [ON/STANDBY] button. "Clear" will appear on the display and the AV receiver will enter Standby mode.

Note that resetting the AV receiver will delete your radio presets and custom settings."

But that may not help.

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 'nekkid'. 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.

Aug 31, 2011 | Audio Players & Recorders

Tip

How to keep your receiver out of "protect mode" Part I


"Protect mode" as it is indicated by many manufacturers of modern AV receivers, is a useful safety tool but all too common a problem for many people.

There are various causes of this safety feature to be executed, and returning your unit to normal function will also vary by manufacturer by which you will have to refer to it's manual on the procedure. But the following tips to avoid getting into protect mode apply to all manufacturers of all receiver designs and circuit topology

The number one cause of "protect mode" is heat. Receivers that have Solid State amplifier topology produce a lot of heat. Solid State amplifier topology is the most commonly used design in receivers.
To reduce and dissipate this heat that can cause it to enter protect mode; do one or all of the following:

Remove anything stored on top of the unit. Anything that blocks the vents even temporarily while operating will cause it retain more heat.

Give it room, out in the open. Do not operate it while it is sitting in a cabinet or other enclosure.

Store it farther away from any other source of heat; don't overlook things like desk lamps directed at it, etc. It takes only 1 degree higher than the units' internal temperature sensor setting to shut it down.

If you are operating it in a hot climate, try placing a mini-desk fan directed into the vents.





on Mar 02, 2010 | Audio Players & Recorders

Tip

How to keep your receiver out of "protect mode."


"Protect mode" as it is indicated by many manufacturers of modern AV receivers, is a useful safety tool but all too common a problem for many people.

There are various causes of this safety feature to be executed, and returning your unit to normal function will also vary by manufacturer by which you will have to refer to it's manual on the procedure. But the following tips to avoid getting into protect mode apply to all manufacturers of all receiver designs and circuit topology

The number one cause of "protect mode" is heat. Receivers that have Solid State amplifier topology produce a lot of heat.
To reduce and dissipate this heat that can cause it to enter protect mode; do one or all of the following:

Remove anything stored on top of the unit. Anything that blocks the vents even temporarily while operating will cause it retain more heat.

Give it room, out in the open. Do not operate it while it is sitting in a cabinet or other enclosure.

Store it farther away from any other source of heat; don't overlook things like reading lamps, etc. It takes only 1 degree higher than the units' internal temperature sensor setting to shut it down.






on Mar 02, 2010 | Audio Players & Recorders

1 Answer

My Aiwa AV-D98 Receiver keeps powering off at random times.


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 11, 2011 | Aiwa AV-D98 5.1 Channels Receiver

1 Answer

What if went in safety mode, safety mode is froze in screen. Won't do anything


"Safety" mode - literally? I don't see that anywhere in the manual.

Page 13

Speaker Connection Precautions

(North American and Taiwan models) You can connect speakers with an impedance of between 6 and 16 ohms. If you use speakers with a lower impedance, and use the amplifier at high volume levels for a long period of time, the built-in amp protection circuit may be activated.

Page 66

The STANDBY indicator flashes red


The protection circuit has been activated. Remove the power cord from the wall outlet immediately.

Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and set the volume to maximum. If the AV receiver stays on, set the volume to minimum, disconnect the power cord, and reconnect your speakers and input sources. If the AV receiver turns off when you set the volume to maximum, disconnect the power cord, and contact your Onkyo dealer.

Generally speaking, an amp protects 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.

Apr 04, 2011 | Onkyo TX-SR608 Receiver

1 Answer

The unit keeps turning off with error code fp coming up then turning off again. the unit is a yamaha av reciever rx-v540


Let's just treat this as self-protection:

Make sure all speaker connections are tight.

Make sure the Impedance Selector switch it set fully in one of its two positions.

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.

Jan 28, 2011 | Yamaha RX-V540 Receiver

1 Answer

Auto protect often cuts sound, when it's not particularly loud. Is there a way I can switch it off, or set the limit to higher?


No, the receiver is protecting itself from damage. If you have it in a cabinet, make sure it's getting plenty of ventilation. If you have not cleaned out the inside with "dust off" do it. Dust is like a blanket and heat is the second leading cause of component failure. Secondly, check your speaker wiring, make sure you don't have excess braid hanging out of the terminals, if one braid touches the other terminal, it won't immediately shut down, however, as soon as you turn it up your increasing the resistance and voltage, therefor causing it to go into protection. That's the number one cause of failure in receivers. Check wiring at both sides, receiver and speaker. Also, make sure your speakers are not 6 or 4 ohms, that causes undue heat as well and will damage the unit. Hope this helps

Oct 03, 2009 | Sony STR-DB780 Receiver

2 Answers

Intermitting sound problems on Onkyo SR-705


Does it only happen when its being stressed (played really loud)? Is it hot? If so, is it well ventilated and away from other heat sources?

Somewhere in here is the answer.


"The AV receiver turns off as soon as it’s turned
on
• The amp protection circuit has been activated.
Remove the power cord from the wall outlet immediately.
Disconnect all speaker cables and input sources,
and leave the AV receiver with its power cord disconnected
for 1 hour. After that, reconnect the power cord
and set the volume to maximum. If the AV receiver
stays on, set the volume to minimum, disconnect the
power cord, and reconnect your speakers and input
sources. If the AV receiver turns off when you set the
volume to maximum, disconnect the power cord, and
contact your Onkyo dealer."

That last sentence is misleading. I don't think they actually want you to play an active signal at MAXimum as a test. I think they mean with all sources attached and an idle one selected, like CD, crank the volume knob. If the amp is not in Protection mode you should always be able to detect some hiss up close.

For another thing, if it shuts down only with speakers attached the problem could be outbound at one or more of the speakers. I would isolate that piece somewhat before throwing my hands up and calling Onkyo. Make sure that the speaker cables are not shorting. Disconnect certain speakers and try it again until you figure out which one(s) are involved. Then it could be the speakers.

Apr 16, 2009 | Onkyo TX-SR705 Receiver

2 Answers

Screen shows PROTECT and i can't hear nothing and do nothing


The receiver is in protect mode either due to heat or crossed speaker wires. Heat would take a while to shut off and a while to turn back on. The speaker wire short would be detected immediately.

Mar 07, 2009 | Kenwood KDC-MP208 Car CD/ MP3 Player

2 Answers

Reciever turns off


Powering off usually points to issues with speaker setup. You should read pages 42 and 96 of the 606 manual.

Page 42 covers impedence settings. Check your impedence settings for your speakers. The 606 handles speakers from 4 to 16 ohms. There are two impedence settings on the 606 - 4 ohms and 6 ohms. Set to 4 ohms if your speakers are 4 ohms or more but less than 6 ohms. Set to 6 ohms if your speakers sit between 6 and 16 ohms. Incorrect settings can result in the 606 going into power protection after prolonged use or at higher volume.

Page 96 covers testing for unexpected power protection. You should switch off your AV at source and leave for an hour. Disconnect all cables to speakers and other peripherals (TV, DVD et al). After an hour turn on AV and turn volume to MAX, If the AV remains on, turn down volume to min, switch off AV and reconnect all devices. Make sure the speaker cables are properly connected and that no bare wiring is exposed.

Once you have done this switch on the AV and turn to volume to MAX. If the AV stays on then problem solved. If the AV switches off then you should contact your supplier.

Nov 24, 2008 | Onkyo TX-SR606 Receiver

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