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Need to get MG Electronics Power Supply repaired...or NOT!?

Former Member

Hi.

I just bought a lot of Slot Car stuff, yes those cars that go around a track. The guy was serious about his hobby he didn't have the usual wall plug in power pack, he used a MG Electronics PS-10AD, 0-20 VDC at 10 Amps. Well this power supply doesn't work anymore. It does turn on and the red overload light stays on. It doesn't put out anything. I used my multimeter etc., nothing. I know that these are made overseas . They did retail for about $200. So the questions is were can I get it repaired OR should I ? I'm in Western MAss.

I did check the fuse , it's fine. I've got a heavy door stop on my hands, it does have a nice handle and cord on it !

Many thanks for info, Ted

 

http://www.mgelectronics.com/shopexd.asp?id=179

Parents
  • 0

    Hi all again!

    First of all than you for all the courtesy that you have shown me !

     

    I did search the web for a schematic, non to be found. I saw that others had the same luck !

    I did open up the MG Electronics Power Supply . I have attached pix of that expedition!

    What I found was....No burnt anything, no burnt smell, no heat, no buzzing noise, nothing looks incorrect, it pretty clean in there!

    I did see what I that was melted something on the giant transformer, I took a Q-tip to it, nothing. Probably tried glue or sealant of some kind !

    Visual I see nothing! I did check the fuse again, it's fine !

    So what usually goes first on a power supply ? Just a reminder, the overload light is on, what ever that info is worth !

    Thank you all so very much !!

    Ted

     

     

    imageimageimageimage

    imageimageimageimage

Reply
  • 0

    Hi all again!

    First of all than you for all the courtesy that you have shown me !

     

    I did search the web for a schematic, non to be found. I saw that others had the same luck !

    I did open up the MG Electronics Power Supply . I have attached pix of that expedition!

    What I found was....No burnt anything, no burnt smell, no heat, no buzzing noise, nothing looks incorrect, it pretty clean in there!

    I did see what I that was melted something on the giant transformer, I took a Q-tip to it, nothing. Probably tried glue or sealant of some kind !

    Visual I see nothing! I did check the fuse again, it's fine !

    So what usually goes first on a power supply ? Just a reminder, the overload light is on, what ever that info is worth !

    Thank you all so very much !!

    Ted

     

     

    imageimageimageimage

    imageimageimageimage

Children
  • 0 in reply to Former Member

    tedbier check to see if you have power in the following places:

    1. Check the fuse with an dvm ohms..
    2. where the power cord terminated: yes move on; No replace cord
    3. check the seconary across the bridge. Yes, Regulator is bad
  • 0 in reply to Former Member

    Mat you have three (3) bridges on the diode board, remove the screws holding it in place. Then turn it over and draw or take photos of the bottom. You should be able to tell the outputs of the transformer to feed the bridges. On a bridge 2 there are two connections for the AC, one for positive and one for negative;  here is a little video that explains them. with bridge in place check input voltages (AC) if that's ok check the(+/-) side. If no joy on the inputs that might mean you big transformer is open, only what to check is to desolder the leads to the transformer and Lable them!!! then check the secondarys. tells you real quick!

  • 0 in reply to phoenixcomm

    Hi Cris,

     

    We have shanghaied the original posting bt Ted Bier as Matt has the same problem as the original poster. Several posts ago we established that we have 3 levels of Positive DC voltage available depending on the setting of the front function switch. We have voltage to the LM 741 ICs that appears to be proper. At this point it seems that the output of the Op Amp is not being applied to the bases of the output transistors. Matt is running tests right now to get us closer to the point of failure. If you have time, go back to the point in this thread where Matt first weighs in and check out our progress to this point. If you have some insights it will be appreciated.

     

    John