Hi. Some years ago I bought an 128Dcr as ”non working”, it was described as having went completely dead with a hint of PSU failure. The PSU in that machine was a very simple linear transformer (no fan) and all it needed was replacing of two bigger capacitors, both were shorted. I replaced all caps, I think there was only a few anyway. After that the machine has worked flawlessly (ie. there was no damage caused by the faulted PSU). It seems that I wrote a short post about it in Lemon64, there are some pics, too: http://www.lemon64.com/forum/viewtopic.php?t=40088 The two golden-coloured caps were the main fault. — Ville Travis Fisher <email@example.com> kirjoitti 10.10.2014 kello 8.25: > I retrieved my old commodore 128 dcr from storage at my parent's house where it sat unused for about 20 years. Perhaps foolishly, I plugged it in and turned it on, with no results. Taking it apart I found the 1A 250V fuse in the power supply was burned through (or possibly just broken from jostling). Replacing that, I tried again. The drive stepper moved a bit then it was dead again, not even power LED. > > The good news is, nothing is obviously fried -- no cooked electronics odor or burn-marks on parts. But reading a bit more, I'm guessing some or all of the electrolytic capacitors are not working properly after 20 years sitting. (Though again, there are no obvious poofed-out tops or leaking material). And now having powered it up with a malfunctioning power supply, who knows what other little bits may have hidden damage. > > I would like to revive this machine. Any suggestions? I have zero soldering experience; is replacing the capacitors on the power supply board doable as a learn-to-solder project? Is it easier to find suitable wall-wart supplies and just patch these in for the 9v and 5v inputs? Message was sent through the cbm-hackers mailing listReceived on 2014-10-10 11:00:08
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