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Harmon Kardon 505 power amplifier

Would like to know the power output on this amplifier.

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Re: Harmon Kardon 505 power amplifier - Amplifiers & Preamps

100 watts per ch

Posted on Jan 21, 2008

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My Harmon kardon is stuck in protect mode

Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Double check all connections .A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.

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I have a Harmon Cardon AVR25II amplifier. I am using BOSE AM7 speakers and subwoofer with this. I need to service same . Any authorised service centres in Pune / India??

Hello im unsure of a harman servicer in your area but i do know there is not going to be a bose authorized as they have cancelled all outside service and request the customer to ship it to there factory.

Feb 21, 2011 | Harman Kardon Amplifiers & Preamps

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I have a Harman Kardon Signature 2.1 amplifier that wont start. Its LED flashes red and yellow indicating that something is wrong. Does anyonehave any idea why?

I work on power amplifiers and I can offer a few suggestions
The flashing light means the amplifier is in "Protect" mode.
This could mean one of two things: 1. The speakers are not connected properly or, 2. There is a component failure in one of the output amp sections.
It might be as easy as a blown fuse in the circuit that powers one of the amp sections.
Not knowing your technical background , I can't say much more about opening the unit and checking for certain things

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I just hooked up my harmon Kardon 2.1 amp after moving and when I fired it up instead of warming up and the indicator light turning green. It turned orange and pulsed red. I could here the amp relay...

Check the speakers, make sure no starnds of wire are touching ony of the other terminals. Disconnect one speaker at a time and turn on the unit to see when and if the unit stops going in to protect mode. When it and if it doest start to stay on then you have removed the bad spkr. Unhook all of then and hook up the bad one only to verify that is whats causing ur problem...

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I have Harmon Kardon AVR 25 ii receivers and I have attached it to Bose 701 front speakers and three other Bose surround speakers and an subwoofer. All the speakers work except for right speaker, I need...

To locate the problem...a) Cable
Test if right cable is ok, by interchanging the rt/left cables.

b) Test Bose right speaker
Connect the Bose right speaker to HK's left channel. Works? Then Bose right speaker is ok.

c) Test HK's right output by connecting the left Bose speaker to HK's right output.
Does not work?

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Ppower on then standby problem Kenwood KR-V8060

This fault may be similar to a Harmon Kardon AVR1550 fault I recently encountered. I did all the usual checks e.g. testing for presence of DC on speaker outputs etc. but all seemed fine, then the fault cleared! Next day it re-appeared and attention was (falsely) given to the protection circuits as the amplifier circuits themselves were considered to be in order. The HK uses both voltage and current protection circuits and it was discovered that the current protection circuit was operating. Eventually the fault was found to be one of the 0.39 Ohm 3W metal oxide resistors that had gone high in value on the left hand channel. Of course your amplifiers fault may not be due to this but the reason for going into standby would probably be the same i.e. due to amplifier protection circuits operating. You need to check out all the output devices and those resistors on every channel, even surround ones you may not be using. Hope this helps.

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