Could you have the circuit board wiring post number confused with the fuse number?
I am a newbee myself, so perhaps one of the more experienced members could help with this.
I think you might have reported fuse 8 blowing, when it is really fuse 6, because you were looking at the post number, not the fuse number.
I have an SX-434 that was given to me, and it blows fused 5 and 6. So far I have been too chicken to dive into it, but I have done some research.
I have noticed that the fuses on the power supply board are not labelled, but the wiring posts that are right next to the fuses are labelled very clearly.
I believe that post 7 is connected to fuse 5, post 8 to fuse 6, post 9 to fuse 8, and post 10 to fuse 7.
I will try to upload a pic of the power supply board (from the web) and one of a portion of the schematic to show what I mean.
If I have this all wrong, will somebody please set me straight. This is the kind of thing that can really throw us newbees.