Question about Denon AVR-681 Receiver

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Resistors How do you know what to ask for? I mean the one I removed was powder Blue does that mean anything?

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If the resistor has been completely destroyed, look on the board for the circuit designation (eg. Rxxx). With that someone with the service manual or access to teh schematic can provide the value and wattage.
Dan

Posted on Mar 19, 2008

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I am looking for a schematic for the AVR-681. Same problem with mine shutting down. Thank you.
Niles

Posted on Dec 21, 2009

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1 Answer

Dh520 protect mode


Usually means you have a blown amp channel. Shorted output transistors and burnt resistors.

Oct 06, 2014 | Sony STR-DH520 A/V Receiver

1 Answer

Onkyo HT-R500 no display


Look on line for service manual. Display problem is usually traced to 1, or more, of 3 resistors in the AC supply to the display. It appears that the resistors are supposed to be 1/2 watt but the one I removed from my unit was only 1/4 watt. The resistors are mounted on a small board mounted on the front side of the main transformer - right most board. I had to unscrew the transformer to access the resistor. I looked at voltages coming out of the transformer and the the same voltages leaving the circuit board. There is a 1 Ohm, a .47 Ohm and another that supply AC voltage to different parts of the display. I found one resistor open. Replaced it and I now have an operating unit.

Feb 14, 2012 | Onkyo HTR500 Receiver

1 Answer

How much can you sell 2 of the following? I need to replace 2-100 ohm 2 watts resistors in my Kustom Profile_one unit. You recommended replacing with 2-130 ohm 2 watt metal oxide resistors. Currently one...


It sounds awfully like the resistors are close to breakdown voltage, I would Suggest that you do replace them with the resistors specified, because using anything else in a high voltage product is a fire risk, now who was it that suggested replacing them with higher ohm resistors? was it a service tech or was that right out of a manual or was if from the manufacturer themselves?
Anything to do with resistor replacement, as yo sound like you know, should be taken very carefully, because if you use the wrong resistors, you risk losing the components after the resister due to a higher voltage or sometimes even causing them to stop working due to a lack of current...
Be very careful and please go back to the manufacturer to get the exact resistors quoted from them and make sure you have it in writing from them so that if something fails you have at least done what you could.
Hope this helps, need any more advice, just ask!
***Please remember that advice on electrical appliances needs to be made by a licensed technician that had experience with that specific product otherwise you risk voiding the warranty or sometimes even risk your own life when concerning high voltage products***

Nov 23, 2010 | Audio Players & Recorders

1 Answer

Colour coding of resistors and placing ie R???


Look up "resistor color code" online. The first two color bands are numbers and the 3rd band is how much you multiply the number by. For instance, a Red, Brown, Orange is a 10,000 ohm (10K) ohm resistor, the orange means 3, but 3 digits. If NOT totally burned-up, you can measure the resistor if you disconnect one lead from the circuit.

Jan 12, 2010 | Pioneer VSX-405 Receiver

1 Answer

The "protector" is flashing, what does this mean?


Most of the time it will need service (output transistors and resistors) This is a job for a electronic service tech. Estimate would be $100- $130

Mar 08, 2009 | Sony STR-DE875 Receiver

1 Answer

Not fixed.


I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Your voltage measurements for the resistors are correct. The regulators should be fine. Remember that the pins that you are checking come before the regulators. I would double check these capacitors that I am referring to. Do you have the schematic for this? If you need it I have a copy. The transformer has multiple taps coming off of it. You cam check the other resistors, but I'm sure that they will be fine. I suspect the caps.

Jul 07, 2008 | Harman Kardon AVR 335 Receiver

1 Answer

No audio


I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Jul 07, 2008 | Harman Kardon AVR 335 Receiver

1 Answer

Onkyo TX-DS595 with no display?


Ran my 595 blind for 2 years and finally spent the time to diagnose it this year. Turns out that one of the resistors that is on the power supply went bad. Similar problems have happened with later models so i thought the same may be true for the DS595.

My Receiver has always run fine.. just no display anymore.

Here's the fix. Replace R9501. its on the larger board that is part of the Power Supply. You will have to take the 4 large screws out of the base of the big heavy power supply block to find the resistor. I believe the old resistors is a 1/4 Watt. I replaced it with a 1 Watt so that it can handle the heat of being turned on and off better.

The resistor you will need to buy is 2.0 Ohm. I wouldn't go anything less than a 1/2 Watt and preferably 1 Watt.

My receiver works line new now!


Nov 15, 2007 | Onkyo TX-DS595 Receiver

4 Answers

No speaker outputs


I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.

Nov 08, 2007 | Harman Kardon AVR 130 Receiver

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