Galien Krueger Fusion 550 schematic diagram or service manual wanted

[John Lovell]

Hello all you GK users.

I have a GK Fusion 550 that has a small problem. When I switch it on it pops like a rifle. All controls are at zero and the mute button is engaged and the same pop occurs.

Has anyone had a similar problem and found a fix or is there a schematic diagram or service manaual available for this great amplifier.

[vintagekiki]

https://music-electronics-forum.com/showthread.php?t=49602

No need at several places lifts the topic about the same thing.