Question about Harman Kardon AVR 7550HD 72 Channels Receiver

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My avr goes into protect mode , I have tried all hk suggestions and checked all the wires and there all on banana clips and there is no problems there . any suggestions please

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SOURCE: HK AVR-247 protect mode

This is an indication of an internal problem. Typically this is shorted output transistors. Expect a parts cost in the $25-$40 range for this repair.

Dan

Posted on Apr 06, 2010

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1 Answer

My Harmon Kardon AVR 2600 goes to protect mode when powered up. After many tries it will fire up but at times it's up to twenty times. I did load the software upgrade 6 months and it has been fine


Check all speaker wiring for shorts, if okay! there is a problem in the audio output stage of the unit or the protection circuit is not working properly. I would suggest a pro to evaluate.

Apr 02, 2012 | Harman Kardon AVR 2600

1 Answer

To fix cpu on protection mode


I am highly skeptical that the CPU is the problem; protection mode is designed for protection of the amplifiers.

Use an artists brush to remove any dust and grime off the voltage rails and heat sinks. Reinstall the CPU and the chassis cover. Turn your attention to the rear connector panel; check for any broken or loose speaker terminals. If your speaker wires are still connected look for any stray wire strands and pull them off or bend them away from the connector panel. Check the connection for tightness, or simply disconnect any corroded wiring that you may not be using a banana or spade connector with and clip and redress it. Perform the same inspecting and maintaining procedures on all of your speaker channels.

When placing the receiver it must also have adequate air flow around it. Anything you can imagine that would allow the unit to retain heat increases the chance of it getting it into protect mode for thermal protection. Out in open air is best.
When the receiver is properly positioned and all connections are secure, power it up; it will likely still be in protect mode. If so, press and hold the power button down until the unit "clicks" inside the chassis; this takes approximately 15 seconds. Protection circuit is reset and you can now operate the receiver.

Feb 21, 2012 | Sony STR-DE597 Receiver

1 Answer

I've just bought HK AVR 260 and have the following problem: Sometimes the sound disappears while changing the channels on my sat decoder, or while pausing and playing again on PS3, or while changing the...


This is clearly a manufacture defect right off the assembly line. From your description you have a serious intermittent problem with the AVR unit when it comes to selection and other choices and it will only get worse, I strongly suggest you return the item in favor of another.

Feb 09, 2011 | Harman Kardon AVR 2600

1 Answer

HK AVR-247 protect mode


This is an indication of an internal problem. Typically this is shorted output transistors. Expect a parts cost in the $25-$40 range for this repair.

Dan

Apr 06, 2010 | Harman Kardon AVR 240 Receiver

1 Answer

Reciver goes into protect mode as soon as I turn it on.


Remove speaker wires and try again. If it still goes into protect mode, the problem is internal...shorted power transistors or some other fault. Check fuses also.

Apr 01, 2010 | Harman Kardon HK 3480 Receiver

1 Answer

Humming sound(speakers)when HK AVR 3550 is powered up?


yea try use in a monster power strip it clears al of that up it is picking up noise from all the wires

Apr 02, 2009 | Harman Kardon HK 3550 Receiver

1 Answer

HK AVR25 MKII goes on and off numerous times on cold power up


The relay on the PWR SUPPLY board clicks once when the PWR switch is turned on then 2 to 5 sec. later it clicks again and 'off' it goes.
The small transformer ( standby power) on the board appears to be leaking crud (looks like wood glue) all along one edge.
Can I bypass this relay to see if the power transformer is 'ok'?

Jan 16, 2009 | Harman Kardon AVR 25 MKII

4 Answers

Amp comes on and goes right into protection mode


Turn the reciever on for a second or two and then off before the protect mode shows up on the monitor. Repeat this step about five times and check to see if the reciever does not go into protect mode. If it does go into protect mode try it again. Dont know if this is the proper way to fix the reciever but it worked for me. Good Luck

Mar 09, 2008 | Audio Players & Recorders

2 Answers

Harmon kardon avr 125 shuts down


If you want to fix it:

It must be a contact problem arount the power switch, power cable, fuse or the condensator area.
Maybe you can se a black color on the board.
And checking the solderind points with a magnifyer can help too.

Thats all from that distence.

Nov 11, 2007 | Harman Kardon AVR 130 Receiver

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