(Topic ID: 234677)

Question on gottlieb system 1 power supply


By Doggy

3 months ago



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  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 3 months ago by Brypten
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    #1 3 months ago

    https://www.greatplainselectronics.com/prodimages/GTLB1_LG.jpg

    I am going to attempt to rebuild my first power supply. Here is a rookie question,
    Which side is the positive leg? The components I took out was clearly marked +++
    I just want to be sure before I proceed. Thanks

    pasted_image (resized).jpeg
    #2 3 months ago

    The arrows point to the negative side. Also the side with the indent is positive on a axial cap.

    #3 3 months ago

    Thank you for your reply,
    I’m learning as I go. Doggy

    #4 3 months ago

    There is a cap C4 on SYS 1 power supplies where negative does not go to ground. Basically negative goes to the lower potential and on this circuit the voltage on this line is below zero. I asked when I did it so I thought I'd pass it on

    #5 3 months ago
    Quoted from Brypten:

    Also the side with the indent is positive on a axial cap.

    Not always. On some older caps, it's the opposite way.

    Here is a refurbishment guide for the power supply: http://www.pinwiki.com/wiki/index.php?title=Gottlieb_System_1#Recommended_Power_Supply_Updates_.26_Repairs

    You really should replace some of the diodes as well, as they were sometimes prone to fail, short out, and burn up.

    #6 3 months ago
    Quoted from ForceFlow:

    Not always. On some older caps, it's the opposite way.
    Here is a refurbishment guide for the power supply: http://www.pinwiki.com/wiki/index.php?title=Gottlieb_System_1#Recommended_Power_Supply_Updates_.26_Repairs
    You really should replace some of the diodes as well, as they were sometimes prone to fail, short out, and burn up.

    I have never seen an axial with the indent on the negative side. Interesting...

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