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Denon avr-5600 protection circuit.

I have a denon avr-5600. I have replaced all the bad transistors in one of the amps, and 6 bad capsistors. I belive the protection circuit is damaged (resistor bad) but I have been unable to locate the circuts. It will be simple to check, if I could just find them. I do not have a diagram or location picture. Would be thankful for any help I can get.

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My AVR 5600 has worked flawlessly for nearly 9 years!

Suddenly, when trying to play music (DVD or CD) through my LS32's (JBLPro), once I achieve higher volume, the receiver cuts off.... Using a Symetrex mixer, NO OVERLOAD light on the Denon, it simply cuts off!

Re-cut all the wire connectors... TV movies (5.1) work great at normal listening volumes.... but tonight, when cranking up music, the receiver simply cut off. Blinking light...

HELP

forfrance@hotmail.com

Posted on Jul 26, 2008

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Need operator manual


From what I understand, the AVR-5600 owner's manual was never released in a PDF format since it was a 1998 model. However, the AVR 5700 manual is apparently a close match to the receiver. You can download the AVR 5700 manual here: Home Stereo System and Headphone Spec Sheet Downloads Denon

May 13, 2014 | Denon AVR-5600 Receiver

1 Answer

My Denon AVR 2805,has a problem. In a few seconds after switching on, it automatically turns itself off. What is the cause of this problem? How can I fix it?


This unit is in what is termed :protect mode". This means that one or more of the amplifier channels has a rpoblem that was detected by the protection circuit inside and the unit has been shutdown to prevent further damage. This is often shorted output transistors or a defective amp pac for the surround channels. Expect a parts cost in the $50 range for this repair.

Dan

Oct 08, 2009 | Denon AVR-2805 Receiver

1 Answer

Protection circuit momentary activation. Not heat/speaker problem


Is it possible for you to lower the source level? if yes go ahead...

There is an automatic Dialogue normalisation function in Denon which is activated to reduce overly bright input signals. ( most movies have wide variation in sound levels and therefore this function is avaialble). (see page45 of your user manual).

When your system worked fine with the AVR 2808CI, then why is it giving problem with AVR 3808CI....???? You must ask Denon.

Protection circuits are activated when:
1). There is rise of internal temperature.
2).Core wires of the speakers are touching each other or a core wire is sticking out of the terminal and touching the set's rear panel or the speaker itself has a problem.
3). Speakers with an impedance other than specified are being used.
or
4). the set is damamged or has bad solder / dry solder connection .

If your AVR is new, please do not accept, the set could be faulty. The protection circuits should not be activated unless any of the above happen.

You must know, at times the protection circuits are not fast enough and it could burn some of the transistors on the power output circuit. With time, the solders on the circuit board could give way and give you problems later on.

You must sort out with Denon if the AVR is under warranty.

Best of Luck.

Mar 11, 2009 | Denon AVR 3808Ci Receiver

3 Answers

Denon avr 2105 died (3 times) dead AVR2105 faulty avr-2105


If your amp looks like it's going to work as normal (ie the front display lights up as it should etc), but then the amp goes into protection mode when the anti-thud circuit times out, then I know what's likely to be wrong.

It's one of the power amplifier channels which has gone faulty.

I just found this out after having this problem with my AVR-1906.

I took the amp apart and de-soldered the suspected channel power transistors (centre channel in my case).....and hey-presto! it fired up as normal (obviously the centre channel would be out of service).

I have ordered the replacement transistors from Farnell (UK) at a miserly cost of around £2-£3 each.

Just waiting for them to arrive.

An alternative is, if you don't use all your channels, take the transistors from a known working but not needed channel and swap them over with the duff ones.

Hope thats of use!

Jul 19, 2008 | Denon AVR-2105 Receiver

2 Answers

Denon AVR-3805


It's likely that you have shorted some speaker outputs, I had that problem and sorted it. Unfortunately it does mean replacing some output transistors..the devices are dificult to get to just to add insult to injury. They are the devices that are mounted directly onto the large heatsink and solder connected to the bottom circuit board. You only have to change the matched pair that you have blown....tricky to identify which ones without some electronics knowledge. The power output section does have some fuses to protect it but sadly these do not appear to be fast enough to stop "one" from damaging the power output stage if you unfortunately short outputs. The transistors are available from Farnell, use pin compatible replacements SAP15N and SAP15P.....all the best. Doctor Bill

May 17, 2008 | Denon AVR-3805 Receiver

1 Answer

I have a Denon AVR 887 surround sound receiver head unit in my living room. Today I was putting in new speakers, and it worked fine for about5 minutes, then it shut off. Now I keep getting a red flashing...


If your amp looks like it's going to work as normal (ie the front display lights up as it should etc), but then the amp goes into protection mode when the anti-thud circuit times out, then I know what's likely to be wrong.

It's one of the power amplifier channels which has gone faulty.

I just found this out after having this problem with my AVR-1906.

I took the amp apart and de-soldered the suspected channel power transistors (centre channel in my case).....and hey-presto! it fired up as normal (obviously the centre channel would be out of service).

I have ordered the replacement transistors from Farnell (UK) at a miserly cost of around £2-£3 each.

Just waiting for them to arrive.

An alternative is, if you don't use all your channels, take the transistors from a known working but not needed channel and swap them over with the duff ones.

Hope thats of use!

May 03, 2008 | Denon Audio & Video Receivers

2 Answers

DENON AVR 1906


Units dc protect mode is probably activating due to Blown channel (shorted output transistors) I work for a Denon Authorized repair Center in Michigan If shipping to Michigan is economical let me know kstahl65@att.net

Feb 05, 2008 | Denon AVR-1906 Receiver

1 Answer

Denon AVR 1500


check the output transistors or ic's most likely shorted.

Dec 19, 2007 | Denon AVR-1905 Receiver

1 Answer

AVR-1603 - no Sound exept over Headphones is a weak signal


First check the outputs at the output fets/transistors for any DC voltage. Reference your voltmeter to the speaker - terminal. If there is ANY DC offset, the amp is shutting down the outputs to protect your speakers from DC. Is the power supply + and - 47 volts? If only one supply is there That is your problem because the supplies should be symmetrical. Also look for any wiring problems from the amp to your speakers... any shorts? Try disconnecting all your speakers to totally eliminate any speaker problem and see if the relays still click. You should hear only ONE click when you first turn the amp on (delay of about 2-5 seconds). If they keep clicking the amp outputs are next. Also, is there any indication on the front panel of what is failing?

Jul 29, 2007 | Denon AVR-1603 Receiver

1 Answer

Denon AVR-810 going into PROTECTION mode


It sounds like there is a problem with the differential circuit. The bias I am not sure about, as every unit is different. You should get the service manual to be sure or call Denon and see if they can give you an idea. Good Luck

Jun 05, 2007 | Denon AVR-2106 Receiver

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