DCX 2496 Selectronic outputboard

Hi
I got a question, I have an old Selectronic output pcb for a DCX2496 and wanted to replace the original Behringer output pcb, there are 3 pins on the Selectronic pcb that have to be connected to the psu and the main DSP pcb, written on the Selectronic pcb is pin 1 PSU 6, pin 2 DSP 6 and pin 3 PSU 3, want to be sure that I read that correct, pin 3 direct to psu on the third connection, that is 9 volts, pin 1 comes from 6th connection on psu and then goes to DSP coming from pin 2 of the Selectronic pcb, is pin 3 only connected to Selectronic
pcb or also to main DSP board? I think both, can anyone give me schematic, I seem to have lost it,
Cheers, Tom.
 
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