"N_Cook" wrote in message
...
Gareth Magennis wrote in message
...

"N_Cook" wrote in message
...
Anyone know of pics of the interior?

A previous "repairer" removed all fuses , ratings on overlay , so ok.
But
did not mark the ribbons before removing all of them. Majority are
mateable
without ambiguity. There are 2x 16 way ribbons with exactly the same
IDC
connectors that could go to either of 2 places on the central board
holding
the graphic sliders and LED bargraphs.
Completely different lengths to the ribbons , does not help to decide
as
the
headers are adjascent
One ribbon is from Conn1 of rear INSert sockets
The other from the CCD display board
Cannot start rectifying whatever the underlying problem was, before
sorting
out this added problem



I have a Horizon here, which I'm pretty sure is the same layout as the
Vision - I have seen lots of this series of Powered Mixer, and they are
all
very similar except different numbers of channels and Power amp modules.

On this one, the front panel PCB these both plug into is marked "R1A8-4".
The connector closest to the back of the mixer (and thus closest to the
alphanumeric display) is the one that goes to the DSP board.

This cable should be the shorter one - it thus makes logical sense that
the
shorter cable travels the shortest distance between the 2 different
connection possibilities, the Insert cable having the longer route and
the
longer cable.


I seriously doubt anything will blow up if the wrong one is connected to
the
wrong socket, unless Studiomaster were monumentally stupid at design
stage!




Gareth.



But a thoughtful designer would make one 20way with 2 redundent or
blocked+cut pin identifier/inhibitor somewhere. As the ps and pa seem to
be
ok I don't want to compound the problem. I think a few ground tracing is
the
way forward, just requires removing the display board which should be easy
enough




Well, maybe they'd run out of unique standard connectors, there are quite a
few in this unit, and these two were designed to be interchanged without any
chance of damage.

Unlike, I might add, the one in some Trace Elliots. There are two of these
on one PCB, only one is actually used, and if you plug it into the wrong one
it takes out part of the power supply.
Now how stupid is that.

Perhaps its best to trace some grounds then .......



Gareth.