Sphere EQ 920 diodes

[Willabe]

My friend has a Sphere EQ 920 that is rack mounted and it's not working right.

Can someone please tell me what the diodes are for that are connected to Q3/Q4 Q5/Q6 and Q9/Q10 Q11/Q12?
Biasing?

Thanks Willabe 

[sluckey]

Not me. My eyes are still burning even as I type this reply!   

[shooter]

I believe;
Q4 n Q10 Base diosdes are "bias" diodes, each will drop .6vdc
the collector diodes do much the same for Q5 n Q11
the one's between Emitter and base I think are "blocking diodes", more thought needed, trees await

[Willabe]

Not me. My eyes are still burning even as I type this reply!   

Sorry, it's the only schematic he could find. I can hardly read it too.

[PRR]

Biasing?

Some of them.

What is "not working right"?

[Willabe]

What is "not working right"?

Thank you PRR. He got it fixed.

It wasn't passing signal when he ran it balanced out to the patch bay, only passed signal unbalanced out to the bay. 

He found a bad diode (he doesn't know which diode exactly, double sided PCB) and installed an output transformer that he didn't know it needed. It had dcv on the output signal. Now it seems to be working fine.

   Willabe