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.......

http://pages.suddenlink.net/ken/connectors.jpg

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.