Who have any technical reference to PMAGB-B card ?

I have DECstatoin 5000/200 with  this card, but dont have
any documenation for it. I try switch on-off  jumpers on PMAGB-B card.
After this procedure my DECstation go to cycle video test after
power-on. I can not boot from machine.

How solve this problem ?
 

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Best regards
                Averyanov Alexander.