You are here

Revox A722 blows the main fuse

my Revx A722 has worked well well with my A700 for one week. Tree days ago when i start the A722, (after my A700) , the on led lit up and went out immediately.
The main fuse whas blow up. 
I tried once more with a new fuse…. the same result. the other two fuse in interior , are ok. I disconnect the spekers … the same.
The A722 are all the interior originaly. I open it and checked for some visible sign of short - nothing to see !
Has anyone experienced it? can someone help me with an advice.