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Denon AVR 2106 Protect Mode (followup)

Dave, Pulled the heat since and voltage regulators tonight. Interesting that the factory used the generic versions of these devices (AN7815 and AN7915F). AN7815 has a metal backing and was not electrically isolated from the heat sink. Neither was the screw that held it in place. The AN7915F had a composition material (part of the overall molded case) and was isolated electrically from the heat sink. I've ordered the Denon replacements. Assuming the replacements have composition bodies is a heat sink compound such as Artic Silver which I use for computer processors OK for this application? Also, this unit was manufactured in China vs Japan. Have you noticed and differences in repair rates based on where they were manufactured. Thanks Again.

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I am very surprised that they had the generics in them. I think that you may have gotten a refurbished unit. I have never seen one come from the factory like that. The one with the insulation is the most important to not be electrically connected to the board by the back metal tab. The other one has the metal tab at the proper place for the ground, so it is OK, I just didn't feel like explaining the difference (typing cramps LOL). The metal tab is electically the same as the middle pin on each IC, but the middle pin is not the ground on both of them, only on one. The heat sink is connected thru the board by some thick wire or metal pins as you have found, and the spot that they connect on the board is the ground.

As far as heat sink compound goes, I have never used the type you have for anything but my CPU, but I really don't think it would be any type of an issue, any type of heat sink compound is much better than no heat sink compound. In fact, yours may be better than what is normally used, silicone heat sink compound, the white stuff.

In all my years fixing these Denon's, I have never run across one that was manufactured in China, I just assumed they were all from Japan. If I worked on some from China, then I did not know it. I just fix what came in the door or what was shipped to us. In Michigan I worked at the only Denon service center in the state and surrounding states. So we got a lot of them, but I never checked to see where they were made.

I am glad to see you have a handle on this, I get a little uneasy giving people instructions on how to dismantle and replace parts. I fear they may blame me for their own mistakes or maybe even shock themself and get hurt. I can see that I don't need to worry about that with you.

Dave

Posted on Dec 04, 2008

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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.

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Denon AVR 2106 Protect Mode (followup)


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/

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