Power supply question.

tinsley

Member
Joined
Mar 28, 2010
Messages
457
Reaction score
1
Location
Connecticut
I have a Golden Tee machine that stopped working. I am trying to test the power supply and see if that is the cause. I test the 2 AC connections and had 137VAC. When I test the +5, -5 and the +12 DC, I get 0 on all 3. Is this common for a power supply that is bad to loose all DC current? I am new and trying to figure all this out... This is a switchable power supply by the way. The only thing I see on it as a model is E 149972.
 
It would appear that you have a Peter Chou power supply. Don't know if yours has screw terminals or if it is a computer style.

If it's a screw terminal type and you have zero output between +5 and ground, then you probably have a blown fuse inside the power supply. If it's blown then there's likely one or both of the switching transistors bolted to the heat sink is shorted (both are type 2SC3039 transistors). Might even have a shorted diode in there. Randy Fromm wrote an excellent article on repairing switching power supplies (especially the drawings and text refer to Peter Chou supplies).
 
It is the screw terminal type. I do not have anything between GND and +5, but also between GND & -5 or 12. So there are fuses inside the power supply case? Would 1 blown fuse cause be to loose power at all these points? Happen to have a link to that article?
 
Yes there is ONE fuse inside the power supply. Generally it is a soldered-in fuse, but some versions may have fuse clips to unsnap the fuse for replacement. When it blows, all outputs go dead.

Here's a link to Randy Fromm's sales page to purchase repair information and "how-to" repair videos:

http://randyfromm.com/shopping/

Switching Regulator Power Supplies (Peter Chou type)
Many operators throw away their power supplies, not realizing how easy they are to repair. Most power supplies can be repaired in less than a half-hour at an average cost of a buck and a half each. This lesson explains the operation of switching power supplies and how to repair them quickly and inexpensively. Parts sources for power supply repair will also be discussed.

Code #SPSDVD Approximately 70 minutes - $29.95
 
Back
Top Bottom