Heath Finnie wrote:
want to run on 15 volts. However, since they want these chips to
interface to analog voltages, mostly through the 4016/4051 analog muxes
and switches, they changed +15v/gnd to +8.5v/-6.5v. Therefore, almost
every part that uses one of these supplies also uses the other.
I guess you have to start disconnecting the +8.5/-6.5v wires from
various boards to isolate which one has a short. You could disconnect
from boards one at a time and check the resistance across the two to
look for hard shorts.
Good luck,
David
> If I plug in the main wire loom into the psu and turn it on, the middle fuse blows immediatelyWell, this isn't surprising. Almost all the digital chips in the CS80
> and I lose the +8.5 and -6.5. If I unplug the main socket into the PSU and turn it on (after
> replacing the fuse it doesn't blow)
>
want to run on 15 volts. However, since they want these chips to
interface to analog voltages, mostly through the 4016/4051 analog muxes
and switches, they changed +15v/gnd to +8.5v/-6.5v. Therefore, almost
every part that uses one of these supplies also uses the other.
I guess you have to start disconnecting the +8.5/-6.5v wires from
various boards to isolate which one has a short. You could disconnect
from boards one at a time and check the resistance across the two to
look for hard shorts.
Good luck,
David