(Topic ID: 52028)

System 1 power supply


By kurtackerman

5 years ago



Topic Stats

  • 9 posts
  • 6 Pinsiders participating
  • Latest reply 5 years ago by FirePower
  • No one calls this topic a favorite

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    #1 5 years ago

    I have checked the voltages at my power supply and they are not correct. The voltages coming in at a2j1 connector are all present except pin 6an7 are supposed to be 69 I get zero. Connector a2j3 has all the correct voltages but a2j2 is missing the -12volts and only have 1.2 where I am supposed to have 5. I tried to adjust it but 1.2 is as high as it will get

    #2 5 years ago

    Hello Kurt,

    To measure the AC voltage, you need to measure between pins 6 and 7. Is that how you measured?

    Since A2J3 has the correct voltages, which are 4, 8, 42, and 60, we have to assume that you actually DO have 69VAC input.

    To measure the -12VDC and the 5VDC, you need to measure between pin 5 of J2 and pin 1/2 for 5VDC and pin 6 for the -12VDC.

    If the PS isn't providing the correct voltages, they really are not worth messing with. Replace with your favorite System 1 aftermarket PS and be done with it. I prefer Ed's from GPE...but they are not in stock that often.
    --
    Chris Hibler - CARGPB #31
    http://www.Team-EM.com
    http://webpages.charter.net/chibler/Pinball/index.htm
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    #3 5 years ago

    Looks like I have 73 volts. I saw a rebuild kit on eBay for 13 dollars. I might need a new mpu and driver board too. Would rather try and rebuild it if that is a possibility. If not my best bet would be to spend the 350 or so on the pasculjannin board with power mpu and driver all in 1.

    #4 5 years ago
    Quoted from kurtackerman:

    If not my best bet would be to spend the 350 or so on the pasculjannin board with power mpu and driver all in 1.

    I love the PI-1X4 board that Pascal engineered. It's a great product.

    You may also choose...
    ...$75 power supply reproduction
    ...$200 Ni-Wumpf MPU reproduction
    ...and fix the driver board. Those things are tanks, with parts readily available.

    Don't forget the wire harness between the MPU and the driver board. After 30 years, the pins in them have lost their ability to grip the edge connectors and need to be repinned or replaced.
    --
    Chris Hibler - CARGPB #31
    http://www.Team-EM.com
    http://webpages.charter.net/chibler/Pinball/index.htm
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    #5 5 years ago
    Quoted from kurtackerman:

    If not my best bet would be to spend the 350 or so on the pasculjannin board with power mpu and driver all in 1.

    You can save yourself a lot of headaches and time by using Pascal's 4 in 1 PCB.
    As long as your connectors are in good shape, displays OK, and your Lights, switches and coils are OK, then the Pascal is the least hassle way to go.

    If you have connector, wiring issues, shorts, shorted coils, switches, etc, you would still need to fix that all up.

    But the Pascal is the way to go.

    Once the Pin is up and running, you can work on the old PCBs and power supply or sell them.

    #6 5 years ago

    I can repair your SYS1 power supply for less than the cost of a new one. They are kind of a pain to work on, but repairable.

    SYS1 games are finicky. The aftermarket boards are a good option if you don't want to mess with stuff. Connectors still need to be in good order though.

    #7 5 years ago

    I went with the repro Power Supply board from Rottendog on my Count-Down. For $75 it was well worth saving the time messing with that pain in the butt original Rockwell. Mine was arching, had bad solder fixes from previous owners, the pots were destroyed and was just more work than it was worth. The Rottendog worked great. There was already a ni-wumpf in the game when I got it that I did a ground mod on and the driver board got a ground mod too. Bought the big interconnector for like $30 and the game was 100% from the backbox. Played like a tank. Guy I sold it to was his first pin, didn't know a thing about pinball. I told him to call if he ever had an issue with it -- sold it to him in December, not a call since. Sys1s need a little love at the get go usually, but after bulletproofing a bit with new boards and a few required fixes, they can play on for a long time.

    #8 5 years ago

    Here's a Mod I did to make disassembling and reassembling System 1 power supplies easier.
    http://pinside.com/pinball/forum/topic/gottlieb-system-1-power-supply-mod

    #9 5 years ago

    +1 on the Pascal Janin x4. I had a bad power supply and possible problems with the driver. It was plug and play. When I ran into an issue with a bad diode on a coil causing, Pascal was a huge help with the diagnosis.

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