4 Oct
2005
4 Oct
'05
4:19 p.m.
Tony Duell wrote:
Ahh, if that's just RGB between the Hi-res board and the BNC board, then
it likely is just a fault on the BNC board. I'd just wondered if there
was some sort of signal passing back to the hi-res board from the BNC
board such that the actual fault was somewhere in the hi-res board
itself but that it'd work fine without the BNC adapter board plugged in.
Sorting it out is one of the first things on the pile when I get home
(where at least I've got manuals and everything to hand!) as I fixed
various other problems with it, so it'd be nice to have a 100%
operational system again. Heck, I even have the key for it ;)
cheers
Jules
Reminds me, I
need to fix mine (output module) on my 380Z. Can't
remember the details now (and it's a few thousand miles away :) but I'm
reasonably sure I remember it blowing the fuse in the PSU on the -12V
line when the board was connected, but the machine was fine otherwise.
Never got around to fixing it before I left the UK, but I don't imagine
there's much on the board to go wrong!
Well, the -12V line is used to power the emitter load of the 3 output
transsitors, but said load is 3k3 or something. Most likely, there's a
shorted decoupling capacitor on the board somewhere if it is blowing the
-12V fuse.
Of course it could be a fault with the RGB board
itself I suppose...
What RGB board? The Hi-Res board has a 8 bit output, that's encoded to
RGB by 3 resistor DACs on the little board behind the BNC sockets. Isn't
that the board we're talking about.