I bought a broken tascam 424 mk2 tape deck for dirt cheap a while ago, with the intention of fixing it up and getting it working . It doesn’t power up when plugged in. I don’t have too much electrical knowledge, however I heard a fault that could cause it to stop powering up was a problem with the power supply. The power supply is hardwired in, and I tested it with a voltage meter. Seems to work fine. I also checked all the fuses I could see, which didn't look blown and seem to be working fine. At this point I’m not sure what else could be causing the problem. Any one have any ideas?