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Denon AVR 2106 Protect Mode (followup)

Checked R184 10 ohm resistor and it checked out @10.7 so that looks OK. The DC voltages for R 145 and R146 look way out of wack. When measured against chassis ground R146 read -28.49 on one side and +3.28v on the other. Similarly R 145 measured +3.27 on one side and + 35.6v on the other. I did check the output transistors a week or so ago. When I compared the ohm readings one against the other they all were similar. I assumed that they wouldn't all fail at once so I discounted their failure. I only have the schematics for the 2106 not the complete service manual. Since the schematics don't have the voltage regulator model numbers I need to ask you for them and/or the Denon part numbers. I assume they will be unique to Denon. Otherwise I could go generic. Please advise and thanks very much for your input. It's what I was looking for.

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Your information you need will follow this next paragraph. I just wanted to explain a little about myslef and the site to you first.

Since my information was just what you were looking for, a rating of "FixYa!" would have really been appreciated. A "Helpful" rating is good for some experts here, but it drags my overall rating down. I am sure you did not realize that when you rated my other post. A FixYa! rating is not just for getting a unit fixed, it is also appropriate when you get all the information that would be reasonable to get for your problem. It is rare that any expert here can actually solve a problem that requires some expert troubleshooting skills without ever having the unit in front of them to troubleshoot. So if you have received the best help possible, it is wrothy of a FixYa! rating. Most people who come here for help have no idea how to replace parts, they usuall want a quick fix that requires the pressing of a couple of buttons. 99% of the experts here could never figure out how to fix one of these Denon receivers. I don't want to toot my ownn horn, but I know these receivers as well as Denon knows them. I have been a audio technician for over 18 years and much of that time I have worked at an authorized Denon service center. So I know how to fix these better than most technicians anywhere. Just because I have so many years of experience working on Denons. I am doing this work at FixYa! for free, I don't get paid one red cent for helping you with this very expensive receiver. Don't get me wrong, I am not complaining, I am just reconsidering offering any more help here at this site. The only reward I get for the help I give people for free is a rating, and most people who get the very best information from me don't seem to realise that "Helpful" is really not that good. I guess you could say I feel a little under-appreciated. Well, enouph of my whinning, lets get to your problem.

From the voltage reading of the regulators I believe that the regulators are both shorted. They should only have 15 volts on each, one negative and one positive.

You could use generic regulators, but they usually have a metal tab on the regulator that would need to be insulated against the heat sinks. The original regulators do not have the metal tab, so no insulator is needed. They are in a TO220 package, just like many transistors. If you use a generic, you must also insulate the screw that holds it against the heat sink. If you do not know how to do these things, please just get the originals.

Here is the part numbers

IC101 Denon part number = 9630219408
IC101 generic part number= AN7815
IC102 Denon part number= 9630219505
IC102 generic part number= AN7915

I hope this gets you back up and running again. I think it will. If you have more problems let me know.

You can get those parts from this website, it is who we use at our shop.

http://www.tritronicsinc.com/

Posted on Dec 03, 2008

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1 Answer

My AVR-2106 receiver will only stay on for a few seconds before clicking off. We have disconnected all components and speakers from unit to eliminate short circuit/wire problems and still with only power...


Hi amy, Your vivid description of the problem confirms that the protect circuit is cutting off the amp on detection of a high current drain. The possible fault is the failure of the Audio Power Output Mosfets. You will need to remove the mother board to test the stage and confirm to replace one of the stages.
The second possibility is that the protect circuit by itselff could be defective and cause a faulty bias to trigger the cut off. This must be checked by a stage by stage Voltage check.
Since the removal of the mother board requires some experience so as not to tamper the set , you must decide on the course of action.
The other option I can suggest is to call up the Denon call centre and check up the nearrest service centre, send and receive the set to them by courier after confirming the fault and estimated costs. If this justifies then it must be thought of.
I am sure you can search for one as I am not sure the place of your residence... try a search on the web for Denon service support with your location/city.
I hope my advice helps but please open the cover to have a look inside for visible damages.
Good day

Aug 19, 2010 | Denon AVR-2106 Receiver

2 Answers

Unit turns on for about 5 seconds and turns off with stand by light flashing


you have shorted output transistors which is causing the unit to go into protect mode. You can try factory reset by turning off unit then holding down speaker a and b buttons then turning back on.

Apr 12, 2010 | Denon AVR-681 Receiver

1 Answer

Denon AVR-2106 - Zone 2 shuts down system


Check your speaker wires on zone 2 and look inthe manual for speaker configurations with zone 2. you may have a speaker conflict. If you still have an issue, post a comment with your speaker setup and I'll help some more. Hope this helps

Jun 28, 2009 | Denon AVR-2106 Receiver

1 Answer

Denon avr-2106 getting hot shutting down


Normally when this happens it is because the impedence load is too small. This unit requires 8 Ohm speakers. If you connect 4 Ohm speakers, it will work, but work harder and generate excessive heat. If the heat is too much, the unit will enter protect mode and shut down. Once it cools off, it will work again. In your case, if the speakers are the correct impedence, check for crossed wires. If that is the problem, running the unit at higher volume levels should cause it to shutdown sooner.

Keep us posted,
Dan

Mar 10, 2009 | Denon AVR-2106 Receiver

1 Answer

Denon 2106 Protect Mode (Close Out)


I am glad that changing those voltage regulators in the power supply of the main board has fixed your problem. As I told you in earlier posts, when you unplug a connector it can give you erroneous voltage readings that can send you looking in the wrong places, and it can be dangerous.

I really appreciate the compliment as well, it makes this work very rewarding.

Thanks again, and feel free to contact me with any future problems you may have with any audio equipment.

Dave

Dec 12, 2008 | Audio & Video Receivers

1 Answer

Denon AVR 2106 Protect Mode


Ok,

I will will help you with this, but you must follow my instructions. These are not easy unit to repair, and your troubleshooting technic may have even caused more problems. You should never power on a receiver with connectors unplugged. Since the 15 pin connector is used for the audio signals only (CN559) you may be OK, but please do not do this anymore unless you are willing to create a lot of smoke.

Since this unit does turn on without that one connector plugged in, I will assume that you do not have a blown channel even though it is the most common reason for these to go into "Protect Mode" which is what yours is doing. They go into protect mode to keep the receiver from causing more damage to the circuits and to prevent fires.

I think the most likely reason your unit is going into protect mode is because the negative 15 volt regulator on the main board is bad. This regulator is located by ref # IC102 and is on a small heat sink in the power supply area of the main amp board. Since you have the manual for this unit you should be able to find the part number and location very easy.

The second most likely reason for your problem is a resistor, ref # R184, it is a 10 ohm 1 watt resistor and it is right next to the pre-amp board on the main board. It is near CP501 but on the other side of the pre-amp board towards the output transistors a little. Check this resistor first with an ohm meter, see if it is at 10 ohms. If not, get a 10 ohm 1 watt flameproof resistor and replace it. Then make sure everything is plugged in right and try it again.

If the resistor is good, then go to the voltage regulator, you can check it by measuring the voltage at resistors R145 and R146. If you look at the schematic for that area, you will see that those resistors are connected to both the positive 15 regulator and the negative 15 volt regulator. One side of R146 should measure -15 volts and the other side of R146 should be at 0 volts. Then measure R145. You should have +15 volts on one side and 0 volts on the other side. If the voltage you measure there is not within a couple of tenths of a volt either way, change the voltage regulator that is bad. If all you get is positive voltage on R146 and no negative voltage, then IC102.

Now you are probably wondering, how can you check those voltage if the unit is shutting off right away. Here is how. Have you meter probes in place before turn the unit on, watch the meter while is is turning on. You only need a few seconds to check each one. Check R146 first, then after the unit shuts off, check R145 when you turn it back on again. This is much safer than unplugging connectors and letting the amp idle with unbalanced voltages which could cause an extreme current draw if left on too long.

If you can not verify any problems with those two things above, then you really do need to check the amp circuits. You can do this with no power connected, but you must take out the main board with the big heat sink. Once you get it out, check the output transistors and start with the pair that is located at the inner most spot of the heat sink. The area close to the display and CNT board. That is the most common channel to go bad. If either one of those transistors mounted on the big heat sink measures shorted of very low in ohms, that is the bad channel. If you have a bad channel, there will be many more parts to replace, I will let you knwo what those are if you find any shorted output transistors. You can not check the amp circuit any other way, you will only be getting a reading across the relays if you try to check it at the speaker outputs. The speaker relays never open unless the unit comes out of protect mode first.

Let me know if I have explained this good enough for you, if not I will give it another try.

Good luck,
Dave

Dec 02, 2008 | Audio & Video Receivers

3 Answers

Denon AVR-1508 Receiver problems - cuts off and goes into protect mode


Usually when the unit runs for a while before shutting down there are two possibilities:

1) There is a small amount of DC current present that effectively heats up the speaker coils enough to cause a temporary short circuit that kicks in the protect circuit.
2) The output transistors or bias transistors are sensitive to heat and breaking down again causing the protect circuit to kick in.

A few experiments to try:

1) Does the time to shutdown change depending upon the volume level?
2) Is there any background noise coming from the speakers? Listen to a blank tape for example. Is there a hum or any other noise that you would not normally expect?
3) If you have a DC voltmeter, check for any voltage between the speaker lines.

Update this and we'll try to narrow this down.

Dan

Aug 18, 2008 | Audio & Video Receivers

2 Answers

Denon AVR-1601


This is a very common problem with denon receivers of the 2001-2-3 vintage. On almost every one, there are 4 little "surge" resistors in the power supply. These werent quite robust enough from the factory and one day would just burn open for no reason. Well, actually there is a reason, the "surge" that happens every time you power the unit up eventually weakens the resistors and then they pop. You need to take this to a denon service shop as I GUARANTEE they have seen this before. They need to check resistors in the picture, locarde above the **** rectangular connector. Resistors numbers R141, 142, 148, 149: 75f69d7.jpg These resistors when measured, should be less than 10 ohms each. If they are more, then they are blown. If they are blown, then have the shop check the channels for blown output transistors. If the outputs are OK, then these resistors should be replaced with 1 ohm 1/2 watt metal -film flameproof resistors. You might need to be prepared for a large bill, because the entire unit must come apart to replace the resistors, however, just checking them takes only about 10 minutes... Good luck and don't try this at home. Rob

Apr 08, 2008 | Denon AVR-1601 Receiver

3 Answers

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Hello,
I got the same problem and on my AVR1404 it is the regulator
-15v (7915). You can control voltage on
R145 : +15v and
R146 : -15v.
The other side of these two resistances are joined together.
Good repair....
Luc

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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

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