Netra T1 7v PSU Fan mod

The Netra T1 has a PSU made by Delta for you that have not looked inside Delta they are made like tanks. Overbuild beyond belief. I guess this is why Sun picked them as there OEM PSU guys  :)

From external testing I know the fan in the PSU will run at minimum of 5v.  Tested at 7v and there is very little difference in noise levels. why no 6v? Its very easy to 5,7 and 12v from any switch mode PSU on pretty much anything that needs a hard disk.
You can get 7v via the following method. +5v and +12v  rails , if you connect the +5v to the negative on the fan and the +12v to the positive to the fan you will end up with 7v at the fan :)

First thing to do is find the +12v and +5v rails thats pretty easy. We then need to remove the existing fan header and we wire it so that its drawing from the new 7v rail we made.

See the following image, I’ve already soldered two wires and feed them back though the PCB. I would of liked to place the wire’s away from the AC side of the PSU but theres just no room to allow this.
PSU 7v mod
Green wire is the +5v (new negative)
White wire is the +12v(new positive)

Heres a image of the new fan header
new PSU fan connector
Stepping back for a moment..
The PSU is a AC mains device.. it will kill you and it won’t care.
Do let the PSU discharge for 30+ minutes before opening the lid. Don’t be dumb around AC power!
If you do not understand the risk and dangers of  AC power don’t try this.!
it may be a very simple mod but its also very easy to accidentally discharge a 400v cap into your ass and that will hurt if not make you wake up dead.

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2 Responses to “Netra T1 7v PSU Fan mod”

  1. thesach Says:

    Is the same modification possible/feasible on the Netra X1? I tried the 5v fan mod for the Netra X1’s CPU fan and very little difference was made; so I reverted back to 12v. I like the Netra X1 though the PSU fan is far too noisy.

    • 100% possible!.
      I’ve got a Netra X1 running OpenBSD now. Your right the CPU fan produces little noise, its the PSU of all things.

      Same concept applies you need to find a 5v source on the PSU board.
      I also swapped the fan to a Scythe fan that runs quite quite between 5v and 7v.

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