Board A7 08590-60001 (HP 8590A SER.2816A02744) circuit diagram

Please, if possible, help me with the problem of restoring the A7 analog interface card with the number 08590-60001 from HP 8590A, series 2816A02744. I can't find the circuit diagram for this particular board anywhere. The problem is that I'm trying to restore the operation of my old spectrum analyzer, but I can't do it because I have a missing circuit. I searched the Internet, but I came across completely different circuits from completely different boards, with a completely different part number for this analyzer. Please be so kind if it's not difficult for you, and if you have documentation on this spectrum analyzer, please help. With great respect to you and your business!!! With best wishes, Alex. R3DCF.