Need help with Denon AV receiver

Jul 01, 2007 3 Replies
K

Hi...



I am having a problem with a Denon AVR-3300 receiver not switching audio between sources. If I am on FM for example and switch to a DVD or any other source, sound goes away. Sound stays dead if I switch back to FM.



I've found if I wiggle one of the circuit boards, the sound comes back. So I wish to remove that board and examine it. The pdf service manual for a similar Denon receiver I downloaded shows almost the identical arrangement of those boards, but does not explain how to remove them.



They are connected to a main board with a type of connector I've not encountered before, and they are very tight. Obviously I don't want to start forcing anything. So I though someone on this group would be able to assist me.



I have posted a close-up of a couple of these connectors.......



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The main board is at the bottom of the picture.



PS: If anyone knows were I might pick up a service manual for this model, please advise.


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M

Typically one must at least partially remove the rear panel and carefully unplug the board(s) by pulling them upward. There may be one or more small tabs at the plugs to release the boards, but I don't really remember this being the case.

Sometimes it helps to resolder the DSP chips to fix problems like this. All it may take is a single bad solder connection on a Chip Enable, Clock, Data, etc line to any one of those IC's to prevent sound, or for the sound not to come back after changing sources, etc.

You can e-mail me for the manual. Reverse the domain name, so that "labolgcbs" becomes "sbcglobal".

snipped-for-privacy@labolgcbs.net

You'll need WinRar to re-assemble the manual; it will come in 4 meg chunks, about 33 meg total.

Mark Z.

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K

Thanks for the help, Mark!

I sent you an email this a.m. I'm looking forward to that manual.

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K

I finally stumbled across an answer to this at

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"Ok. they are strictly male/female snapped together. First make sure to remove any screws that are holding the board to the back panel thru any connector & by grabbing the edge of the board and gently pulling up while holding the bottom board, it will disengage from its base. Trick is to make sure all the in/out connectors are free from the back panel so it can be pulled straight up without interference .....make sure the pins are not bent when going back to reinstall it. Depending on the board & it's position,, may almost have to remove the back panel. At first it may feel somewhat awkward, but it will disengage. You may use a contact lubricant spray such as "cramoline" to make removing a lot easier."

That was for a different brand of receiver, but the posted pictures were just like mine.

I took his advice with the contact lubricant, and managed to get that board removed. During careful examination I discovered one loose solder connection, at the corner of a small heatsink, which probably was supposed to connect two ground points together

I re-soldered it, replaced the board, plugged the receiver in and turned it on. It worked, and I started breathing again.

Thanks to all in this newsgroup for helping with this and other technical issues in the past.

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