elmo st1200 blows fuse sound

[Arnau Pell]

greetings to all!
my elmo st1200 (m/o) a few days ago, while projecting a movie, it started to make a serious humming sound that increased in volume until it stopped. Then there was no sound when projecting the movie. Power off and check fuses. one was cast (the one marked in the photo).
I replaced it, turned on the projector, hit the sound on button and "pluf" blew the fuse.
Can someone guide me on what points I should start checking? I am quite null in the electronic field.

Thank you all!

[Steve Klare]

My best guess would be an electrolytic capacitor in the sound circuit has shorted. There are usually a couple of large ones to filter the voltage ripple on the sound circuit power supply. This may also explain the loud hum you heard as it was becoming ...incapacitated.

[Arnau Pell]

Thanks Steve, I'll start reviewing them