INTVCruise Posted September 27, 2019 Share Posted September 27, 2019 Hello everyone, I had a working one a little while ago that I literally just tested and it's dead. I used it about 3 times no problems, put it away and never touched it again and now for some reason it just wont work. I used a multimeter on it to see what was up and the voltage output is about 3-5V, if I leave it plugged in, the voltage seems to rise steadily but never enough. I currently have 3 power supplies that all do this, is there anything I can do to fix them, I can solder quite well just need to know what to do. Thank you! Quote Link to comment Share on other sites More sharing options...
atari-dna Posted September 27, 2019 Share Posted September 27, 2019 You’ll have to open them up, inspect the fuse and diode bridge. One of the 1N5401 diodes is probably going bad. Measure the A/C ripple current on your output also, if it’s above just a few hundred millivolts that’s a dead giveaway the bridge diodes are failing. Quote Link to comment Share on other sites More sharing options...
onemoretime Posted September 27, 2019 Share Posted September 27, 2019 I ve never found an early one to take apart. The ones from Best, and the later ones I ve cut apart and repaired easily enough, though they look like hell afterwards. Quote Link to comment Share on other sites More sharing options...
atari-dna Posted September 29, 2019 Share Posted September 29, 2019 What’s the base look like? If you see two screws then there are two more hidden under rubber feet. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted September 29, 2019 Share Posted September 29, 2019 3 hours ago, atari-dna said: What’s the base look like? If you see two screws then there are two more hidden under rubber feet. Yeap and most of the time due to the age of the rubber on those feet, they don't just pop off and end up ripping off instead...ugh... Quote Link to comment Share on other sites More sharing options...
atari-dna Posted September 29, 2019 Share Posted September 29, 2019 True but there are modern replacements which work well 3M156065-ND is a Digi-Key part number for a solution to this problem. Quote Link to comment Share on other sites More sharing options...
nick3092 Posted October 1, 2019 Share Posted October 1, 2019 If you are cracking open the 5200 power supply to replace/check the diodes, might as well replace the two 3300uf/25v caps in there as well. 2 Quote Link to comment Share on other sites More sharing options...
atari-dna Posted October 1, 2019 Share Posted October 1, 2019 If you are cracking open the 5200 power supply to replace/check the diodes, might as well replace the two 3300uf/25v caps in there as well. Agreed. Make sure to save the sleeving and be cautious with the long leads when installing your replacements. Quote Link to comment Share on other sites More sharing options...
INTVCruise Posted October 13, 2019 Author Share Posted October 13, 2019 Hello everyone, thanks for everybody's help, got so busy totally forgot about this. I have 3 non working adapters, all of them are the kind with two screws in the middle and the screws underneath the feet. All 3 of them are already opened, can someone please suggest where I can buy replacement parts to fix them, maybe post a link to the part, or a list of parts needed, I would appreciate it greatly! Thank you! Quote Link to comment Share on other sites More sharing options...
atari-dna Posted October 14, 2019 Share Posted October 14, 2019 Digikey has the capacitors and diodes, including the pigtail fuse. I’ll post part numbers tonight. It’s a very small board and some delicate work but not impossible to restore providing the transformer is good. Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted October 14, 2019 Share Posted October 14, 2019 I actually just repaired 3 of my own this weekend. They all had blown or loose fuses. 2 of them I blew out the fuses on over the spring trying to take current measurements. The 3rd had attempted repair done on it in the past apparently because when I opened it up, I found a 250v 10a fuse electrically taped inside that wasn't making contact with the clipped leads from the old fuse that used to be there. Had no idea that had been done to this PSU since I bought it used as working like 20 years ago? Lucky the fuse didn't fall inside and cause some real issues. I ended up clipping the old ones out and soldering on replacement 250v 5a standard buss fueses to the clipped leads. Good as new and I got back 3 I didn't have before. Funny the OP has 3 dead also and I did once I started looking into my small stash of spare PSUs. Quote Link to comment Share on other sites More sharing options...
atari-dna Posted October 21, 2019 Share Posted October 21, 2019 Here’s a snapshot of a power pcb I just overhauled 2 Quote Link to comment Share on other sites More sharing options...
atari-dna Posted October 22, 2019 Share Posted October 22, 2019 5A 250V pigtail fuse, 3300uF 25V (105degree) nippon caps and 1N5401 diodes for the bridge. Better than new. 1 Quote Link to comment Share on other sites More sharing options...
jukeboxhero10 Posted February 22 Share Posted February 22 Sorry to necro this but, its there a video on this process? Also how does one tell if the fuse and or diode is gone or just assume all are bad and replace em? Quote Link to comment Share on other sites More sharing options...
atari-dna Posted February 26 Share Posted February 26 I haven't filmed the process. PM sent Quote Link to comment Share on other sites More sharing options...
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