"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.