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Do you hear the relay click when you turn the unit on? If not you have a issue with one or both amps. If you do get a relay click, check your pre-amp out/main amp in connections on the back. You may want to also play with your controls, dirty controls can cause this condition as well. If you would like to have the unit serviced, check out my website, I have a lot of experience with the vintage Marantz units.
If you have plugged in to 230AC with voltage settings was 110VAC, the transformer has been damaged already [opend winding]. If the voltage settings was 230VAC itself, there will be no harm to its internal transformer. Anyway, open it, anc check the fuses. In some cases, fule only will blow out, preventing from furhter damages. I'm not sure about it, but check it. If the fuse only has blown out, and there has no harm; you are lucky I should say. OK.
I have this problem. it is caused by an o/c mains transformer primary winding. the clicking and flashing light is the stanbyy circuit trying to switch the power on to the main (large) transformer when it gets no voltage out it switches back off
There is Definately a Short in the Amp if tapping Fixes it. Could try opening the amp and Inspecting the Back side of the Terminals. You can use a Voltometer and check the Wiring inside. Turn off Power Before doing this!
open it up and take the mechanism out, then you should see a servo PCB screwed to the underside of the mechanism. unscrew this and where the connecting wires plug in from the main PCB, you should see 2 or 3 fuses which look a bit like capacitors and should be red in colour marked MPXXX eg. MP100? replace these if you can find spares, if not bridge them with a bit of thin wire soldered in place and then it should switch on once reassembled. the clicking sound you mention will be the main power supply capacitors running and this is normal.