Hi, I am fairly new to electronics and need an advice on reusing PSU from a printer (please excuse my terribly non-technical language below). I already spent 2 days and it it is much easier to buy one but this has become a challenge. I took apart two large printers and have the same issue: 3.3v, 5v and 12V work fine but 24v does not output any current. It requires some kind of feedback or input with a lower voltage (just like ATX power supply) but cannot figure out how. Tried just about any kind of loop-back with "flowing" or "static" current to no avail.
At this point I am not trying to "fool" the PSU to output the 24V but rather trying to figure out the PCB and modify it (with desoldering parts or adding a few) so that the output happens without any kind of feedback (is there a relay that is controlling the output?). This would also allow not to have a 5v supply running on a side all the time. The first picture is the entire set-up when trying to hack it. The rest of the pictures are the closeups of the PSU's PCB. thank you in advance.
At this point I am not trying to "fool" the PSU to output the 24V but rather trying to figure out the PCB and modify it (with desoldering parts or adding a few) so that the output happens without any kind of feedback (is there a relay that is controlling the output?). This would also allow not to have a 5v supply running on a side all the time. The first picture is the entire set-up when trying to hack it. The rest of the pictures are the closeups of the PSU's PCB. thank you in advance.