Hi Neil,

> ive checked the internal jumpers and these are in place but am at a
> loss with what to do next.

I take you mean those in the middle of the busbar running across the
back of the case( ). However there are other places these signals can
be 'cut': on the A-190 by the bus conector there are two links which
can be cut (page 4 of manual), and the A-140 has a separate jumper to
disconnect it from the gate on the bus (also page 4 of its manual
entry), but since you are not getting CV into the A-110s I'd suspect
the former (there is no independent mechanism in the A-110 to
disconnect it from the bus). Can't think of anything else at the
moment, but I'm sure others will come to the rescue if there is...

Tim