Let me give a link to another resource in Russian. There we gathered a lot of information about the pinouts. Maybe this information can help somebody -
https://forum.bits.media/index.php?/topic/10447-raspinovka-i-prochie-tonkosti-nastroiki-server/I did find a panel with a potmeter behind it, which allows to adjust voltage to about 11.8v though. But i need 10v Sad
Most of the power supply is regulated by potentiometer. If we do not go adjusted to the correct value. We need to alter the power supply circuit, it is often difficult and does not make sense. I need to 9v. On most PSU is "impossible" default without change circuit. Sad.