responding to
http://www.electrondepot.com/repair/...12-167701-.htm
, Nightlight wrote:
soundserviceleeds wrote:



"Nightlight" wrote in message
roups.com...

Hi,

I received this desk in bits, literally, in a huge bag and have slowly
been
rebuilding it.
There were a number of different revision boards probably from other
studiomaster desks in the bag also.

The modules I,ve used in the desk are as follows

Control/graphics R1A8 - 2

Power amps R1A5 - 4

Aux board R1A9 - 1

PSU R1A1 - 4

Insert pcb R1A3 - 4


The problem I have is no sound from the power amps.

I have traced the l&r signals from the "Amp" volume
control on the Aux board
to CONN 2 (14W) pins 9 and 10 which then goes
via ribbon cable to the control/graphics board CONN 6 pins 9&10
labeled as
*AMP-L* and *AMP-R*.

According to the many studiomaster schematics I managed to find the
signal
then leaves the control/gfx board via CONN 2
a 14 WAY to the insert board and PSU board for splitting to the power
amps.

Thing is, CONN 2 on the c/g board is 16 WAY, it has to be as the
connectors
on
the insert board and psu are also 16 WAY and here lies the problem.

The power amps are expecting the I/P on their CONN 1's pins 9&10 (
IN- ,
IN+
) Not AMP-L ( or AMP-R )!!!

I was thinking the c/g board was the wrong revision. The only schematics
I
have for the C/G board are for R8C8B-3.

Any ideas folks?

thank you,

Night...


____

--






From memory, I think it is actually possible to fit a ribbon cable in
the
wrong place on these.
Check carefully what connectors you have and what cables you have, you
might
have a cable missing?

Anyway, also from memory, the very longest cable that could be put in
the
wrong place is used for the very longest run between any two sockets it
can
fit in.
The next longest follows the next longest possible route.

There is a small MIDI board on the bottom corner at the back of the
unit,
which has a connector in use, maybe you've missed that?



Cheers,


Gareth.




--
Very true Gareth but I assure you they are all in the correct place.

Thank you for your reply