/diy/ - Do It Yourself

>>908342
..and forgot to mention, the lamps are switched via the "Function" rotary switch on the front panel. S(witch)10 and S11 would refer to individual decks of that switch, S6, 7, 8 and 9 also appear to be decks on that rotary. Each switch "layer" in a rotary switch is referred to as a "deck" where I am, terminology may be different where you are, but to be clear, pic related has three decks (layers of switches), your function switch has 6 from what I can see in the bottom right of >>908337

Find which deck the lamp board connects to, and see if you can work your way back to the mains transformer from there.