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I have a harman/kardon avr 335 and can't get it off of protect mode? Please help

Posted by Russ McFadden on

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Tom Chichester

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  • Audio Player... Master
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Your H-K is in protect mode because of component failure.

Posted on Nov 08, 2020

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5 Related Answers

Anonymous

  • 44 Answers

SOURCE: Harman Kardon avr 1500 service manual

try here - http://www.harmankardon.com/product_support/support_detail.aspx?prod=AVR500

Posted on Dec 16, 2007

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melnatividad

  • 4 Answers

SOURCE: I have a Harman Kardon AVR 235 Receiver that go's into Protect

To avoid making the avr go into protect mode when you power up your Hafler 4000 that is connected in the avr's pre-out, you must power up the set up in the correct sequence.

1. Turn off your avr
2. Connect Hafler 4000 to the avr's pre-out it it is not yet connected
3. Turn on your Hafler 4000. The avr will not go into protect mode becasue of the transients from the Hafler because it is still not powered on.
4. Turn on you avr. There should be no more transients from the Hafler at this stage unless it is not functioning correctly, so the avr shouldno longer go into protect mode.

Posted on Dec 16, 2008

Kevin Braid

  • 382 Answers

SOURCE: can I conect harman Kardon avr 230 to apple tv

Yes, although it (AVR) does not support HDMI only component video.

Connect the audio to the receiver and the video directly to the TV if you have inadequate video inputs, or want to take advantage of the HDMI.

Posted on Jan 01, 2010

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Anonymous

  • 308 Answers

SOURCE: AVR amber light will not return to blue after

There is an internal reset switch mounted on the transformer board. Open the unit, look at the boards attached to the transformer, the pushbutton is facing up. Measure the voltage on the 2 pins of the switch. If it is a logic low, the switch is partially shorted. Replace the switch or just cut the jumper wire just below thw switch. When this switch fails, it constantly resets the receiver and stops it from powering up. It does not fix a protection mode problem.

Posted on Mar 04, 2010

AJIN G

Electro Med Services

  • 6694 Answers

SOURCE: Harman Kardon receiver in protect mode. Removed

hi,

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Noramlly AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Posted on Feb 12, 2011

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Cripes, been working great for several years, (My Harman Kardon AVR 335) but my coffee maker shorted out and trip the circuit breaker in my house that must also be in line with living room. Of course I...


Sounds like it's in protection mode, receivers do this so avoid circuit damage. It's usually only when speaker connections are shorted, but here it appears it has a surge protection of some kind. A local hifi shop will usually be able to reset such problems.

Jan 05, 2010 | Harman Kardon AVR 335 Receiver

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Can you advise me as to where (in the uk) I can obtain the .47ohm fusible resitors please for my harmon kardon 335. I have chnged the capacitor that was S/cct


try this link http://www.rapidonline.com/Electronic-Components/Resistors-Potentiometer/Low-Ohmic-Resistors/4W-Low-ohmic-resistors/65206 its in uk
the order code you will need is 62-7108 for that store
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Dec 19, 2009 | Harman Kardon AVR 335 Receiver

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I have an AVR 335 less than 3 years old no sound


Hello

Yes, there is something you can try, to know where to look for the problem if this happens again. If the receiver is still under warranty, just send it back, otherwise, open up the amp and trace the path back from the speaker channel to the capacitors on each channel, this is usually the problem(you should be able to see if it is blown, cheap to repair).

If all the channels went out at the same time, there is something wrong with the central unit, to repair that, if it is not the above problem, cost expensive.

Hope this can help you.

Kind regards
Andrea

Nov 09, 2009 | Harman Kardon AVR 335 Receiver

1 Answer

I'm looking some info on a diode that has cracked and the only thing about it is that its D788 in a Harmon-Kardon AVR 335


D788 is a zener diode rated 5.6V 1/2W, part #HVDMTZJ5.6BT. It shouldn't be too hard to find one of those. Good luck with the repair!

Jan 10, 2009 | Harman Kardon AVR 335 Receiver

1 Answer

I have a Harman Kardon AVR 235 Receiver that go's into Protect


To avoid making the avr go into protect mode when you power up your Hafler 4000 that is connected in the avr's pre-out, you must power up the set up in the correct sequence.

1. Turn off your avr
2. Connect Hafler 4000 to the avr's pre-out it it is not yet connected
3. Turn on your Hafler 4000. The avr will not go into protect mode becasue of the transients from the Hafler because it is still not powered on.
4. Turn on you avr. There should be no more transients from the Hafler at this stage unless it is not functioning correctly, so the avr shouldno longer go into protect mode.

Dec 08, 2008 | Harman Kardon AVR 235 Receiver

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