Hadn't turned this one On in a couple of months. Picked it up again, fixed the broken antenna connector...connected an AM loop antenna... worked for 15min and it turned itself off.

The male connector already had the central prong broken when I found this unit in the trash. Today I removed the rest with the Dremel and soldered another prong.

https://i.imgur.com/t31lakm.jpg

https://i.imgur.com/VhnGA92.jpg

I only had an AM loop antenna around but connected it anyway like this:

https://i.imgur.com/nQC5F37.jpg

I dont know if this might have caused the damage or not. The unit worked perfectly for 15min (finally had FM reception) but just shut down and it doesnt turn on anymore.

Havent tested anything with the multimeter yet. I'd just like to ask first if the incorrect use of antennas might have been the problem.

Here is teh service manual:

https://www.google.com/url?sa=t&rct...r1rWjbWi9txosrA&bvm=bv.77161500,d.d2s&cad=rja
https://docs.google.com/file/d/0B6fu025jFteZaHAzZHVndDlWdUk/edit?pli=1
http://www.hifiengine.com/manual_library/denon/dra-345r.shtml

 

The antenna connection most likely had nothing to do with it.
Get the service manual, a test meter and start the usual diagnostic procedure, which begins with a look and smell inspection.

 

Update:

Neither the aerial connections or the AM/FM tuners would affect the amplifier operation since the aerials are not electrically coupled and in any case, the tuners are disconnected from the preamp and main amplifiers when selecting a different input source. There is a block diagram on p13 of the manual that shows how the inter-connections are arranged.

I will proceed to check secondary AC voltages, rectifier outputs, etc, taking in account the circuit diagram in the final pages of the service manual.