Question about Audio Players & Recorders
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.
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.
Posted on Dec 04, 2008
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Posted on Jan 02, 2017
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