ManiN
Member
Picked up a board and harness. I bench tested them and things seemed fine until the monitor went out and a few fuses blew. The fuses are for 12V on both the SB and FA blocks. The fuse on the monitor chassis blew and it's still getting power. The monitor thing could be a separate issue.
I tried to test out why the fuses blew and can play the game blind with one fuse replaced. The remaining 12V fuse on the FA block keeps blowing and for some reason I test 15V coming back at the transformer! I try to test at the transformer for 12V and have nothing. Fact is, I haven't gotten a decent reading out of any part of the transformers when I put ground on 0V and hot on 12V or even 7V and so on. How the hell can there be 15V coming from the board to the transformer? Is the power supply on the board putting power back through the harness to the fuse then to the transformer to then short it out and blow the fuse? F7 in the pic below is the one that keeps blowing and has 15V coming from the board side of the harness and not the transformer. All help is greatly appreciated!
I tried to test out why the fuses blew and can play the game blind with one fuse replaced. The remaining 12V fuse on the FA block keeps blowing and for some reason I test 15V coming back at the transformer! I try to test at the transformer for 12V and have nothing. Fact is, I haven't gotten a decent reading out of any part of the transformers when I put ground on 0V and hot on 12V or even 7V and so on. How the hell can there be 15V coming from the board to the transformer? Is the power supply on the board putting power back through the harness to the fuse then to the transformer to then short it out and blow the fuse? F7 in the pic below is the one that keeps blowing and has 15V coming from the board side of the harness and not the transformer. All help is greatly appreciated!