find the error in this Nelson Pass style PSU, please... - diyAudio
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Old 1st November 2016, 05:50 PM   #1
jdg123 is offline jdg123  United States
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Default find the error in this Nelson Pass style PSU, please...

I cannot find what I did wrong in this power supply and it's making me crazy. Can you un-crazy me?

Everything is out in the open, no hidden wires and it follows the long time published PSU from 2005 except I had to use CL40 instead of CL60 NTCs (they handle more amperage but put forth less resistance.)

I have a bunch of pictures, maybe someone likes this kind of puzzle?
Attached Images
File Type: jpg overhead.jpg (308.9 KB, 311 views)
File Type: jpg transformer and V+.jpg (251.4 KB, 305 views)
File Type: jpg V minus side bridge.jpg (965.8 KB, 291 views)
File Type: jpg V+ wiring side.jpg (318.8 KB, 288 views)
File Type: jpg Ground hook up.jpg (261.4 KB, 275 views)
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Old 1st November 2016, 05:54 PM   #2
jdg123 is offline jdg123  United States
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I guess there really is a set of hidden wires...the red and black primary input power wires go under the bank of 15,000uF caps to be hooked up to a Corcom IEC module. The blue and green emerge from under the shield and go to the bridge rectifiers...

It is pretty much a direct part-to-part translation of the F5 power supply and I cannot get my dim bulb tester to go out...the PSU never charges up...
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File Type: jpg F5PSUschematic.jpg (87.1 KB, 177 views)
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Old 1st November 2016, 06:03 PM   #3
jdg123 is offline jdg123  United States
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A few more pictures of the IEC and grounding. Note all ground wires are orange and go to a single point on the chassis floor...
Attached Images
File Type: jpg Ground hook up.jpg (261.4 KB, 162 views)
File Type: jpg signal ground with NTC.jpg (300.4 KB, 83 views)
File Type: jpg IEC attached.jpg (220.5 KB, 75 views)
File Type: jpg IEC neutral hook up.jpg (463.0 KB, 62 views)
File Type: jpg IEC positive hook up.jpg (796.2 KB, 63 views)
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Old 1st November 2016, 06:06 PM   #4
llwhtt is offline llwhtt  United States
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Are the secondaries Blue/Green and Blue/Green OOORRRR Blue/Blue and Green/Green?

Craig
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Old 1st November 2016, 06:09 PM   #5
sangram is offline sangram  India
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Are you sure the primaries are wired up correctly? I could see a few places where the wiring could be optimised, but nothing glaringly wrong.

You could try disconnecting the rectifiers and see if the problem persists.
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Old 1st November 2016, 06:10 PM   #6
wdecho is offline wdecho  United States
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Why do you have the center ground wires going to each bank of + and -? And the long white wires connecting both banks does not look correct to me. Snip those wires and also the negative going to the banks. With the terminal strips being used it is a little hard to figure out the whys and whats. Only positive should be on one strip and on the other strip only negative voltage in relationship to the center ground. The center ground should not be hooked up to anything else. Other than the IEC ground which actually has nothing to do with correct voltages, only a hum and safety aspect.
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Old 1st November 2016, 06:16 PM   #7
wdecho is offline wdecho  United States
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If you look at the schematic you will see the two banks are not connected to each other other than the 2.2K resistors which also has nothing to do with the circuit. Those resistors are bleeder resistors. You can snip them until you get the PS section working correctly and bleed the caps down manually with a resistor.
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Old 1st November 2016, 06:21 PM   #8
jdg123 is offline jdg123  United States
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I will try to add some data...

Image of the transformer layout antek AS-4218
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File Type: jpg antek AS-4218.jpg (175.2 KB, 99 views)
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Old 1st November 2016, 06:24 PM   #9
jdg123 is offline jdg123  United States
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About the layout of the center ground lines in orange, I meant to mimic the F5 psu layout where they leave the bridge rectifiers, travel along the caps, meet and then pass through a NYC before hitting star ground.

The white wires that crossover the cap bank are to afford a V+ AND V- attachment to both (F6) boards.
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Old 1st November 2016, 06:25 PM   #10
jdg123 is offline jdg123  United States
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OOPS...NTC...:-)
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