Sansui AU-4900 problem

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Hi everyone.
I have a Sansui AU-4900 that I am having trouble with. Well... kind of..

See, outside the transformer there are 3 fuses. The one at the bottom (125V 6A) blows immediately every time. But the amp still seems to work great. All features appear to be working. I even had a microphone plugged in to try.

I have the schematic and circled where the fuse is. Does anybody have any ideas what the fuse is for?

Thanks for any help!
 

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Hi.. sorry, the fuse is where I highlighted it and underlined in red. the other two highlights are where the other two fuses are..
Yes the fuses are not shown on the schematic. And other amps of this model online just have and empty area where these fuses are.

I'm wondering if that fuse is used when this is plugged into another countries outlet of 240V. It would be drawing less amperage at a higher voltage? Just a thought
 
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