EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: EK701 on November 21, 2014, 02:28:39 am
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I just got a BK Precision 1735 (not the 1735A) power supply (http://www.tequipment.net/BK1735.html (http://www.tequipment.net/BK1735.html)) for cheap and I want to do some basic tests on it before I plug it in, so I'm looking for a service manual. I did a web search, but no luck. I can probably get by without one, but it's always better to have the manual. If anyone knows where to get the manual online or if you have a hard copy, please let me know.
Thanks!
Eric
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'repaired one of those a couple of months ago. It had a bad bridge rectifier.
I was not able to find a service manual either. But, on the bright side, the power supply was based around the LM723 voltage regulator.
www.ti.com/lit/ds/symlink/lm723.pdf
(http://www.ti.com/lit/ds/symlink/lm723.pdf)
It's not too complicated of a circuit.
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Repair videos. Schematic and pix links in comments of first video. I am not the author. Good stuff.
https://www.youtube.com/watch?v=PdtS2WB3aHY&t=3s (https://www.youtube.com/watch?v=PdtS2WB3aHY&t=3s)
https://www.youtube.com/watch?v=IpkXcxZBDqw (https://www.youtube.com/watch?v=IpkXcxZBDqw)
https://www.youtube.com/watch?v=H0D6_hgl_iA (https://www.youtube.com/watch?v=H0D6_hgl_iA)
Schematic Attached. Board pix too big to attach; see first video comments for link.
https://drive.google.com/file/d/1hPfrbPpVYsPpvWJyk9woXMio2SEN9Y1b/view (https://drive.google.com/file/d/1hPfrbPpVYsPpvWJyk9woXMio2SEN9Y1b/view)
https://drive.google.com/file/d/1UTZf0lRMxIFOBGM3m2JKutHKFZUPHFZg/view (https://drive.google.com/file/d/1UTZf0lRMxIFOBGM3m2JKutHKFZUPHFZg/view)
https://drive.google.com/file/d/1jZkXvO7JUSCr2tn8F2lbwndxn316j08r/view (https://drive.google.com/file/d/1jZkXvO7JUSCr2tn8F2lbwndxn316j08r/view)
Yes, I know this is an old thread, but this post keeps the information centralized.