Main fuse blow on Classe DR8

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Hello
I have an Power Amplifier Classe DR-8.
The main fuse burns (5A slow blow).
Once, i active the switch to the front of the amp, the fuse burns instantly.
A second try with a new fuse and I hear the relay activates after 8 seconds.
Do you have a suggestion for this problem

Thank you and good day 🙂

Yves
 
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