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Studiomaster powerhouse vision 12

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...

____

Reply to
Nightlight
Loading thread data ...

What makes you think there is the making of 1 full amp, in that collection?

Reply to
N_Cook

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.
Reply to
Gareth Magennis 

--
what makes you think there isn't?


Everything works except feed to power amps!
Reply to
Nightlight 

--

I've done enough SM powered mixers mate.

Just never come across this problem before...
Reply to
Nightlight 

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

Thank you for your reply :)
Reply to
Nightlight

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...

____

--




One more try. 

Doesn't the Aux board on the top panel (carrying the L/R from the Amp volume  
control) connect straight to the Insert PCB, NOT the FX board? 
And doesn't the FX board connect to both the top panel and the MIDI board so  
it can send and return signals to the mixer section, and be controlled via  
MIDI? 



Gareth.
Reply to
Gareth Magennis

-- Hi Gareth,

As I said before, The Connector on the AUX board is 14 Way. The connector on the insert board is 16 Way as is the connector on the PSU.

This desk has no MIDI

So the output from the Aux board must go to the 14 Way i/p skt on the cont/grafx board

It's just that even though the output connector on the cntr/grafx board is 16 Way it has different pinouts from the other two.

I'm going to have to do some splicing to the ribbon.

.

Wish I could attach some drawings .

cheers :)

Reply to
Nightlight

FYI, the "Control/Graphics" board is the top panel board with all the graphic eq sliders on it, the board with the display on it is called the "Display proccesor"...

Reply to
Nightlight

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