Help needed to identify pins of power supply
E out ADJ - voltage output adjustment [think EMF].
OVP ADJ - (output) over-voltage protection adjustment.
I lim ADJ - (output) current limit adjustment.

The 13002 transistor is equivalent to an NTE130 which is equivalent to a 2N3055. A search for "2n3055 power supply circuit" gives lots of results.

At a guess, INH could be "inhibit," as in switch off the output. But from its location, it could be some signal that the PSU is getting input power (input high?).

Another guess, in view of the 30 V-rated capacitor, is that the three input pins are for connection to a 12-0-12 V transformer (i.e. centre-tapped), or maybe 6-0-6 V.

I suspect, unless you know otherwise, that the video equipment is not related to the power supplies.

It would be a very bad idea to apply 120 V AC to the input.