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How To: Run Compaq ESP127 power supply model: PS-5501

I got ESP127 power supply from an old Compaq server some time ago, with intention to use it as my RepRap printer power supply. But I couldn't find any useful information on the internet on how to get it to power on. 
Today, I've decided to grab my multimeter and play with it to see if I will be able to get it to work. By default when you plug the power cord to it, the cooling fan will start spinning but the green LED at the back will stay off and there will be no voltage (or almost no voltage) on any of the power rails +3.3v, +5v, +12v. This power supply +12v rail can handle 25 amperes which makes it perfect for a reprap. 
After an hour or so... I saw a green light ;)

 I've soldered terminal socket to the 12v pads to make it more portable and easy to setup.



Comments

  1. Unknown31 March 2016 at 08:02

    hi,
    do you now also how to get out -12V,+5V and 3.3V?

    ReplyDelete
  2. Rav14 April 2016 at 16:13

    I'm not sure about -12V but 5v and 3.3v should be available at the bottom pads, just measure the voltage between ground and the pads

    ReplyDelete
  3. Unknown19 June 2017 at 22:37

    Thanks, i got the same one for a project, i see you soldered/shorted in 3 places (2above, 1 below), in a normal ATX you only need to short 1. are those 3 shorts really needed? or just one? just making sure, thanks, don't won't to blow the thing up :)

    ReplyDelete
    Replies
    1. Rav22 June 2017 at 08:07

      It was a while ago.. but I'm pretty sure these 3 shorts are needed, I had the backplate/edge connector for this psu and I have figured out the correct (hope so ;) )pinout from it.. I have 3 of these running without issues since almost 2 years :)

      Delete
    2. Gervasio12 July 2017 at 07:19

      Thanks from my prusa i3 whit new power supply ! :)

      Delete
  4. Unknown7 January 2019 at 10:56

    thanks alot

    ReplyDelete
  5. Unknown25 January 2019 at 13:35

    Hi I have the same power suply and , as you , my green LED is not on but the fan is , how did you fix it ?

    ReplyDelete

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