(Topic ID: 259172)

Data East 520-5047-03 PS for MSF Capacitor Question

By GL_Pinguy

4 years ago



Topic Stats

  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 4 years ago by GL_Pinguy
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

I am having some problems with my MSF lighting up but not starting. After testing the power supply board I found some voltage differences at the test points and at the LM723 regulator. So I was going to replace the regulator and at the same time upgrade the capacitors. When I dumped out the replacement capacitor set I bought from Yorktownparts.com they look the same as the ones on the board. See photo. The only difference I see is that the old ones are 85c 25 volt degree and the new ones are 105c degree 35 volt. Does it look like they have already been replaced?
Thanks, Tom

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#2 4 years ago

I can’t answer all your questions, but the new caps are ok as replacements. For caps, an increase in voltage rating is ok, as long as the capacitance is the same.

Never replace an original cap with a lower voltage rated cap. The smoke will likely escape.

#3 4 years ago

Thanks Billc479 for the reply. That is good information. Now I just need to find out if they have been replaced already.

#4 4 years ago

If you don’t have a capacitance checker to verify if a cap is bad, look closely at the solder joints. How do they compare to others on the board? If they look the same, then likely they are original.

Do any of the caps look swollen or have crystals or powder under them? If so, that’s a bad cap.

#5 4 years ago

A leaky cap is just as bad as leaky batteries. It will eat the traces...

#6 4 years ago

When I replace board caps I have 3 specifications which I can almost always meet.

1) Same capacitance rating as original
2) Not manufactured in China
3) Same physical size as the original

Like yours, this almost always results in a capacitor with a higher voltage and temperature rating than the originals.

#7 4 years ago

Always good to use 105 degree capacitors vs 85 degree, but there are some real scum out there. For the most part if the new capacitor is physically larger than the old with the same ratings, it's likely a piece of crap. A good quality capacitor will always be smaller than scum every time for the same part rating.
Easy to look at the solder connections to see if the parts have been changed normally.
Some capacitors also have a code date on them, like 4618, which would mean it was made 46th week of 2018 for example

#8 4 years ago

Thank you all for your reply's. Looking at the caps I can not find a date code. All of the traces and solder pads for the caps look like original solder so I will be replacing the caps with the newer higher voltage caps. It does look like all of the pin / power connectors have been replaced. Now I just need to wait for the 14 pin IC socket to come in, and by this time next week I hope to working on the original short that blew this board originally.

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