That must've been a really cheap VCR if the PSU is part of the main PCB and the input lead is just soldered in... but looks like they were nice enough to silkscreen where you should cut if you want only the PSU
haha, cheap it must be. it has only one large board, and most of it is empty, with wire jumpers all over.
that's my thoughts when seeing those white silkscreen lines. good thing i completed the Advanced PCB Sawing course!
The outputs will be the traces that cross the line, there will be output rails and ground. Possibly an enable input as well.
thank you for the pointer! i looked at the board a little closer, and realized the power section within the white line box is surrounded by fat ground trace, and only 5 thinner traces come out of this surrounded area. alright! the 37V, 14V(not 15V, i made a mistake in the original post), and 5V are all there. +/-30V don't seem to come out of this area. there are 2 jumpers jumping out of this area, marked F+ and F-, i don't know what they are. 6V shows up in some another area, i don't understand where it gets the 6V from.
The PSU circuit itself looks very simple and reminds me of a laptop AC adapter. It's all low-density through-hole construction so tracing the schematic won't be hard. I don't see any controller ICs, so the oscillator is probably made from discretes. Keep in mind this also means there is likely no protections either.
there are only 4 parts in this section with the IC/transistor look, please see the picture.
S1WB: bridge rectifier.
C4533: 3 legs, the best matching number i could find on the web is 2SC4533, npn power transistor.
D1548: 3 legs, best match 2SD1548, npn low frequency amplifier.
2501: 4 legs, couldn't find anything that makes sense from the web.
no crystals, only one packaged up gray thing that might be an inductor, and there are some parts i can't identify. i'm a newbee, sorry.
switching power supply can't be without some sort of oscillator or IC controller, correct? and what does "protection" mean then, if you don't mind explaining that a little?