Help me find a power supply diagram

Hello, All This is the situation. Yesterday a man at work brought Kvant-BK (although I first from afar I thought it was a programmable calculator ala 80s, like electronics :)))), and having scoured the Internet, I realized that this is not only unforgotten, but also passion is growing!!! :v2_clapp; A; The problem is this: the Kvant-BK does not impart any signs of life. The power supply LED does not light up, so I thought that the problem was in the power supply, because... not for long Thinking, I opened the case and checked the LED - it was in good condition. Maybe Does anyone have an electrical diagram indicating the ratings of the radio components on this power supply? (I found the appearance of the power supply unit and the insides of the Kvant-BK one to one on the internet http://sblive.narod.ru/ZX-Spectrum/ATAS/Within.jpg), and is it possible to turn on without load, that is, without connecting to the computer board. :v2_conf3; /To; Unfortunately, I haven’t worked with electronics for about 5 years, so I have a variety All that's left are a poling iron, tweezers and a multimeter, and global measurements no way to get busy /

Hello fan Thanks for the advice, but if I had my computer, I wouldn’t suffer. And of course I would like everything to be there leave the original.... :v2_rolley

Hello, AVK Take the power supply from the dog and don’t worry, but instead of the old power supply, put in a floppy drive. ZY When connecting the floppy drive, do not connect the wire going to the last pin (34), there is +5V! Z.Z.Y. Brain expansion scheme tamo - http://sblive.narod.ru/ZX-Spectrum/PLM-X/PLM-X.htm, as well as s.m. diagram ATAS-256k.